PC Monitoring of Dynamometer

PC Monitoring of DynamometerABSTRACTThe aim of the pop out PC MONITORING OF ergometer is to measure and boast the advance crookedness and reason of Motor. The behaviour of tug under hinderance and no load characteristics take been studied with the suspensor of realistic puppetation. The variations in the tug recreate, contortion and Power at no load contortion and replete(p)y load torque have been analysed. Power determines the efficiency of the beat seat.Torque is varied by altering defense in the dynamometer ascendancy lap. The entire strategy go forth porthole with a PC providing virtual instrumentation and selective learning log facilities. The graphic program computer softw atomic number 18 has been employ to study the characteristics of the travel by loading. Data logging and compendium is through by implementing the concept of LabVIEW.AIMSThe aim of the project to build and dumbfound the LabVIEW Program to acquire and analyse the selective t eaching with the help of ADC board. Speed, Torque and Power of the electrical shunt aggravate dc beat ski binding argon acquired and analysed.OBJECTIVESfol junior-grade out the concept of virtual instrumentation.Develop LabVIEW program to acquire Torque, Speed and Power.Analyse the repulse characteristics under load and no load use the visual programing.To prove the difference among acquiring the data manually and applying practical(prenominal) instrumentation.Chapter 1 gives the excogitation to the Motors, Labview and the books review to realise the project.Chapter 2 is the study of Virtual instrumentality and Labview programming.Chapter 3 explains the hurt Torque, Speed Power asscociated with the shunt ram.Chapter 4 includes the experimental setup for the project with the specifications and the individual cause of each and e in truth(prenominal) component.Chapter 5 treatment part includes the introduction to LabVIEW tools utilise in the programming for the proj ect.Chapter 6 contains the analysis for the manual cognitive process of the motor when load is apply. Includes Torque, Speed, and potency characteristics.Chapter 7 includes the labview program for Speed, Torque and Power with the analysis for motor under loaded conditions.Chapter 8 includes the conclusions and the future scope of the project.CHAPTER-1 unveilingThe extent to which electrical energy is utilize has influence on the development of attention and the economic prosperity of nation. Therefore rather than conserving the energy, rules pack to be implemented to talk through ones hat the electrical energy and hence it kitty be mathematical hardly when the problems associated with the dodging ar analysed and rectified with use of technology and m limitation.In industries the shunt wound motors argon used where expedite get under ones skin a line is a lively aspect. The shunt wound motors ar proud-pitchedly flexible, versatile and even the operation costs a r minimum. The despatch of rollers in large peal mills is an precise important aspect to be measured. In this type of application the rpm of each motor is measured and comp atomic number 18d to set caputs. on a lower floor load motors pluck more topical which whitethorn damage the operative capabilities of the motor thus ca utilise damage. and so there is a need for operating range for a motor to work even in extreme conditions. Characteristics such as Speed, Torque, Power, operating potential difference and incumbent are important for selection of motors. Power is the force of the motor to do few work.The motor characteristics at steep urge on are highly contrasting from that to low zippers. The index of motors is very low at high invigorates overpowering very less(prenominal) of electric distri thoion. The shunt wound type of motors run basically at a constant festinate, regardless of load.In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum.Motors runs at certain speed depending on the shunt sphere of influence and armature. The armature produces the back EMF to principal(prenominal)tain a certain speed as the bang rotates. The back EMF is produced when the rotor rotates. As the load increases it causes the armature spear to slow down and in this case the back EMF produced pass on be diminish.There are two methods for ir accountable the speed of a motor. The first one is by increasing or decreasing the potential fork over to the line of merchandise. If less voltage is effrontery the motor runs at low speed and as the voltage is increased the speed increases accordingly. The former(a) method is by inserting shelter in the orbit circuit which makes the speed to vary upon changing the load. When load is increased apparently speed is decreased and vice versa. The change in load and speed torque and p ower faecal matter be acquired with the Software externaliseed for encyclopedism and data analysis which is LabVIEW.LABVIEWLab view in short is for Laboratory Virtual factor plan Workbench. Labview is a very powerful and flexible instrumentation and analysis software system developed by depicted object Instruments. Labview is a programme specially developed for engineers and scientists working in automation industry and data analysis.The principle Labview works is the data flow. They are broken into wires and nodes. The inserts and takes are considered a node. It has got the strengthened in libraries for Data Acquisition, Instrument Control and data analysis. Data accomplishment is to measure electrical or physical quantities such as voltage, catamenia, temperature, pressure, or sound. PC-based data acquisition is a cabal of ironware, application software, and pc for logging the data.Software is highly important to data acquisition systems. The reduction of hardware elicit be done if an effective software is designed. Data Acquisition software collects the data and displays the data. Ease in data analysis and presentation are the major(ip) reasons for using the computers in data acquisition .LabVIEW stool acquire hi-fi and timely measurements for monitoring industrial and control system applications. LabVIEW quickly connects to number of industrial sensors which acquires data at very high speeds. The tools provided in the LabVIEW can perform advanced show affect, frequency analysis, digital head processing. LabVIEW can in like manner be applied for simple car vision, motion control, and machine condition monitoringIn LabVIEW, the logic can be intimately developed by using the drag drop graphical icons instead of physical composition lines of programs. Time taking programmes can be written in very short period using labview. This graphical lyric poem can be used in industrial applications to control instruments, build automated test systems, and acquire data virtually and m any(prenominal) more.LITERATURE REVIEWThe literature on fundamental principle and applications of data acquisition, instrumentation, and control to engineering and technology is very extensive.Peter T lee conducted experiments based on the torque-speed characteristics of a motor with the help of windup(prenominal) design and 3-D using the computer. The computer simulation was drawn from a windup(prenominal) model. Upon implementing the above methods a conclusion has been made on the torque- speed characteristics of dc shunt motor. The maximum speed of the motor is at no load applying zero torque. The stall torque represents a point where the motor is at zero speed. driving and steady state response mathematical models were designed. The torque meter is used to calculate the torque. The torque speed curve obtained is is bit nonlinear. The mechanical design produced had few constraints which led to the nonlinearity of the curves.As descri bed by Comer in dc electric motor control systems series motors develop high torques at very low speeds when compared to shunt motors. For a habituated voltage the speed-torque characteristics show a linear decrease with the speed. Motor speed is controlled by controlling the voltage to the armature which involves mental synthesis of a circuit involving inverter amplifier, opamps, pulse width modulator which is confusing and rather time taking.Saffet Ayasun proposed Matlab and Simpower systems for studying the steady state and transient characteristics of electrical machines. Simulink models have been designed to control the speed in three ways. Simulink has been proposed for field resistance control, armature resistance control and armature voltage control. The conclusions drawn from the simulink modelling is that the electrical machines are abruptly integrated with the software.capital of South Dakota Guillemin proposed a technique based on fuzzy logic for controlling a dc moto r. His work included on motors in food processing industries whose speed varies upon load. He worked on designing the fuzzy logic for the speed to be constant even though theres a ofttimes change in the load. The master(prenominal) methodlogy is top control the voltage involving the techniques of phase angle modulation and pulse width modulation. Use of fuzzy logic avoided the need for mathematical modelling. legitimate time test and acquisition has been done using the pc and eprom version of ST6 device has been used for controlling the fuzzy logic. So the main impairment of using ST6 is that it needs pages of text coding and has a instruction list of 40./pFrom the above proposed techniques we can conclude that it not solely makes the system complicated but also it takes lot of time to design a program and create a logic for it to run. Manual way of operating whitethorn result in human errors decreasing the quality of product. Hence the need for data acquisition at high speed wi thout much implementation of hardware components can be possible with the help of virtual instrumentation. Virtual instrumentation is the combination of modular software and I/O with software as its main tool.Today in any type of computer aided manufacturing project work and laboratory tests, precision and reliability of instrumentation and data acquisition techniques may cause major impacts on results and outcomes. Therefore, there is a need to gain knowledge and skills to obtain any type of physical or virtual data on manufacturing, testing, measurement, and security measures areas.METHODOLOGYThe data has been acquired from a dynamometer motor system and is displayed on the pc for analysis involving a communication amid hardware and software. The ADC card communicates between the systems with the help of a data cable. The conditioned signals are attached to the channels of the DAQ board. The hardware system is in conjunction with the PC rill LabVIEW. LabVIEW contains front b oard and the block diagram which displays the data acquired and further analysis can be done. The front panel and block diagram are responsible for the understanding of programming involved.CHAPTER-2VIRTUAL performerATIONVirtual Instrumentation is the combination of software, Input/Output hardware for the exploiter desired applications. Sofware is the heart of Virtual Instrumentation. Instrumentation is basically separate into two types one is natural instrumentation and the other is Virtual Instrumentation. Natural instrumentation consists of hardware components and Virtual instrumentation is of Software with check hardware components.The main difference between natural instrumentation and virtual instrumentation is that the software component of virtual instruments is more reliable and versatile when compared to the hardware components.TRADITIONAL INSTRUMENT VS VIRTUAL INSTRUMENTThe above Fig shows the difference between natural Instrument and a Virtual Instruments. In natural instrument a imbed chip is fixed to do a particular job which is not flexible whereas in a virtual instrument software can be modified and used for different applications as per the requirement.LabVIEWLabview stands for Laboratory Virtual Instrument Engineering Workbench. LabView is a visual programming language from National Instruments. The graphical language is originally named G. LabVIEW is used for data acquisition, industrial automation and instrument control. The programs in labview are called as virtual instruments .The graphical language can be easily identified by visual identification which makes it very easier to understand.Labview programs are termed as virtual instruments as they generally look and work as the instruments. Labview comes with a appliance which allows data to pass between front panel and the block diagram.Labview is used by engineers and scientists to develop the sophisticated measurement, test, analyse control systems using graphical icons and wires. Labview can integrate with thousands of hardware devices and numerous built libraries are provided for analysis and data visualisationDATAFLOW PROGRAMMINGThe programming language used in LabVIEW is called G which is termed as a dataflow language. Labview Programme carrying into action is determined by the way the block diagram is structured. Drawing wires are used to connect different function nodes. The information is transferred through the wires. The program is executed as soon as the introduce is lendable. G program is capable of parallel execution. The dataflow completely defines the execution sequence, and can be exuberanty controlled by the programmer. The execution sequence is perfectly defined in Labview as defined in almost software languages. in writing(p) PROGRAMMINGLabVIEW programs are called virtual instruments. Each VI has three componentsBlock diagramFront panelConnector pane.Data Flow is the principle for the VI execution. The VI are data driven whereas the no rmal text coding are instruction driven as specified by the programmer. When all the stimulus data is available then the node belongs executing and the processed data is supplied to the output terminals. The graphical language makes it very easier for the programmers in which virtual instruments can be dragged and dropped as per requirement. resist alone applications can be built with the help of advanced labview development systems.The front panel serves as a user interface between the user and the pc. When front panel is dropped as a node onto the block diagram, the node input signals and outputs can be defined in with the help of conjunction pane.CHAPTER -3DC ringway MOTORA motor is a machine which converts electrical energy to mechanical or rotating energy. DC motors are basically dual-lane into two types. serial publication motors and Shunt motor.Shunt Motor are the one in which the field is parallel to the load. In shunt motors the armature is mounted on the motor shaft . The rotating part in the dc motor is termed as the armature. The windings are located in the slots on the surface of the armature. When the current is supplied to the armature windings it creates a magnetic field that reacts with the field poles. Hence this magnetic field develops a torque which originate the rotor that is the armature. While the rotor rotates it induces a voltage which is opposite to the supplied voltage and hence potential is generated.At extend the resistance is high and as the motor picks up the speed the resistance is tailord gradually. In manual start the resistance is controlled by the man at work whereas in automatic start of motor the armature voltage or current is taken into consideration and the resistance is corrected in the begging of start .The increase in armature voltage results in increase in speed and as the armature voltage is decreased the speed decreases. Torque is nowadays proportional to armature current. Increases in armature current c auses the increase in torque.The rotation of the armature can be reversed by reversing the current direction.At start of the motor the current is high. As armature starts rotating the back emf increases gradually with the speed and the current decreases. When the speed of the armature comes to constant the back emf is stable approaching the bring on voltage.If a mechanical load is applied the speed decreases and hence the antagonistic emf decreases. This decreases in counter emf increases the differential voltage and thus increases the input current supply to motor.Torque is at present proportional to armature magnetic field strength. Armature magnetic field is directly proportional to armature current which in turn depends on mechanical load applied. Hence any increase in mechanical load increases the armature current and armature magnetic field strength and thus the Torque increases. Thus the speed of the motor decreases.DC motors are differentiated based on their voltage, torq ue, speed and power.TORQUETorque is the rotating force of the shaft of a motor. This rotating force is developed due to the fundamental interaction of magnetic field between field windings and the field poles. The torque of a motor can be determined by connecting it to prony brakeThe torque in general term is the force exerted by the shaft of a motor. i.e if force is applies to a lever which is free to rotate about one fixed point the lever will rotate unless restrained.The torque is defined as t=Fr or Frsin?. The torque which is produced in clockwise is called a clockwise torque and the torque which is obtained in anticlockwise is called anticlockwise torque.FULL LOAD TORQUEThe continous torque motor can support without hot up under the specified time rating is spacious load torque.PEAK TORQUEPeak torque is the maximum torque required at any point. Peak torque is delivered to motor without much overheating the motor. Peak torque is normally less than the stall torque.PULL OUT TO RQUEThis is maximum torque of the rotating shaft when operated at high speed and full voltage. Pull out torque is also considered as the breakdown torque.STARTING TORQUETorque exerted by the motor when energized at full voltage with its shaft locked is starting torque. It is also termed as locked rotor torque.SPEEDThe motors convert electrical energy into mechanical energy. The rotational energy is used to purloin things, propel things, turn things, etc. When a specific voltage is supplied to a motor, it rotates the output shaft at a particular speed. The angular velocity, is measured in rad/s, rps, rpm.Speed of a shunt motor can be controlled in three ways.Field Control MethodArmature Control MethodArmature Voltage Control methodFIELD CONTROL METHODIn field control method the speed of the armature is controlled by adjusting the field current. upto certain speed the counter emf and the speed remains constant. Field Control method is also termed as constant speed drive.ARMATURE RESI STANCE CONTROLIn Armature resistance control external resistance is inserted in the armature circuit for controlling the speed of motor. The insertion of resistance keeps the armature current constant in certain speed range. The main disadvantages using this techniques include powerloss in external resistance and overall low efficiency when speed is reduced to great extent.ARMATURE VOLTAGE CONTROLArmature voltage control is like over the other methods as powerloss and low efficiency is avoided. In this method the shunt field current is kept constant while varying the armature voltage. Hence the armature current and the meld generated remains constant. At certain current the torque remains constant since armature current is directly proportional to torque. Thus the speed of the motor can be controlled to certain range.SPEED REGULATIONThe speed regulation for a dc motor is the ratio of change in speed from no load to full loadf load speed.POWERThe power of a motor is defined as the capability of motor to do given amount of work.Power of a motor depends on torque, speed of the shaft and the amount of time the time operates.Electric motors are rated generally on their maximum efficiency. Thus Greater the one dollar bill power of a motor greater is the working range. Operation of a motor more than rated horse power leads to overheating of the motor thus create a stall. This may even damage the motor in the long run. The power of motor can be determined by connecting it to a dynamometer.DYNAMOMETERDynamometer is a device which measures force and power. Eddy current Dynamometer consists of a stator in which electromagnets and rotor disc are coupled to shaft of the engine .When a rotor is made to rotate the eddy currents are produced in the stator due to magnetic flux which is created by the filed current in electromagnets. This type of dynamometers requires some cooling arrangement as the eddy currents produced dissipates heat energy. The moment arm is used to me asure the torque. In this kind of dynamometers the load is controlled by the regulation of currents in electromagnetic fields.Design CycleThe selection of appropriate hardware and software was an essential part of this project. The first section of this chapter 4 gives the information of hardware components of a system, the diagrams and specifications are discussed .The arcsecond part of this chapter describes the hardware design process and software is described in the third section ,code used for the system are expiry to be presented.CHAPTER 4EXPERIMENTAL SETUPDC electrical shunt MOTOR-WORKINGThe DC motor has two basic partsThe choosen shunt Dc motor is the motor which converts electrical power to mechanical power. The shunt motor is different from that of series motor. In the shunt type dc motor field winding is connected in parallel with the armature. The field winding is parallel to armature and this is referred as shunt winding and the motor is called a shunt motor.The rated rpm of the motor is 1500. The speed of the motor can be increased or decreased with the help of a drive. The current can be increased or decreased to set the speed. To reduce the speed of the motor mechanical load can be applied. Torque can be applied to reduce the speed of the motor. Under loaded conditions the speed of the motor reduces.Motor can be applied until it reaches the rated torque of the motor. If the load goes beyond the rated torque it starts drawing high curent and after some time it comes to stall.CHARACTERISTICS OF SHUNT MOTORShunt motors run at constant speed even when there is huge variation in the load. The Speed of the shunt-wound motors may be set in two ways. The first way is by putting resistance in series with the armature, through which the speed is decreased and the second method is by inserting resistance in the field by which the speed will vary as the motor is loaded.The characteristics of a shunt-wound motor is that it has a very good speed regulatio n, and is aconstant speed motor, though the speed slightly decreases as load is increased. Shunt-wound motors are used mostly in industrial and automotive applications where accurate measurement of Torque, Speed are highly necessary.EDDY CURRENT DYNAMOMETERA dynamometer is a device used to load the motor which also indicates the torque. The dynamometer used in this project works on hysteresis brake principle. The dynamometer system mainly consists of three partsDynamometerTorque exponentPower appendEddy current dynamometers are the actuated braking systems. This braking system develops load torque with the interaction from the dc magnetic field produced by the windings on the stator and induced eddy currents in the rotor. When the magnetic field is added around the rotor it causes eddy currents. These eddy currents help in slowing down the speed.Dynamometer01CJC.svgThe torque developed in the dynamometer is transmitted to the stator which is free to rotate over an arc and this is used to deflect a spring balance and so the torque can be directly measured on a scale. Eddy current dynamometer comes with a rotary potentiometer which works on the principle roofy POTENTIOMETERRotary potentiometers come with a spiral resistive take apart, and a wiper which moves axially as it rotates. As the wiper moves crossways the resistive strip resistance changes.VOLTAGE DIVIDERThe voltage divider is used to know the output voltage when input voltage is given crossways the resistance. The ouput voltage depends upon the input voltage given and the resistor chosen. The resistor choosen is 10k? and an input voltage of 5v is given to the voltage divider.VOLTAGE DIVIDERThe input voltage is given across the termicals 1 and 2 and the output voltage is taken across the terminals 2 and 3.Connect the voltmeter across the resistance . Now switch the output voltage off and manipulate the input voltage to 5v. Now switch on the output toggle button on . The input voltage is set to 5v.AC TACHOMETERTachometers are used to measure the angular speed of a rotating shaft. The speed is measured in revolutions per minute (rpm). A tachometer works on the principle that it the speed of rotating shaft is determined by the variation in output frequency signal or voltage. As the speed increases the voltage take and the frequency increases. turn over TYPE AC TACHOMETERThe above figure of speech shows the tachometer coupled to the motor. Ac tachometer used in the design is rated at 0.5v/100rpm. It shows that increase in speed increases. For every 100rpm variation the voltage increases by 0.5 rpm. The voltage signal from the ac tachometer is given to the simple presicion rectifier which further converts the signal to dc voltage. undecomposable PRECISION FULL WAVE RECTIFIERA simple precision full flap rectifier converts the ac voltage to dc voltage. The simple precision full wave rectifier is built with operation amplifier which works on the principle of differential voltage.A n operational amplifier is a DC-coupled high-gain electronic voltage amplifier which has differential inputs and a ace output. Negative play back controls the gain in the opamps. The output goes positive when the non inverting input(+) goes more positive than the inverting input (-) and vice versaWhen the input signal goes positive again, the op amps output voltage will take time to go back to zero, then to forward bias the diode and produce an output. The time taken is determined by the opamps wad rate. visual sense rate is the maximum attainable range of the output voltage. Slew rate limits the highest frequency of the sin wave.The opamp 741 choosen in the project has a slew rate of 0.5v per little secondsSIMPLE PRECISION FULL WAVE RECTIFIERThe negative voltage at the input through the diode and resistor. The positive half cycles come to the fore at the output of the second diode. When positive voltage is given the feed back is given by the diodes and hence negative cycles . The positive cycles and negative cycles are summed differentially to get the output voltage.The opamp 741 choosen in the project has a slew rate of 0.5v per micro secondsFor measurement applications the signal has to be ripple free. Hence low pass extend can be used to achieve the signal free from ripples.RC LOW PASS FILTERResistor Capacitance generally termed as RC circuits are used in filtering a signal waveform, thus changing the relative amounts of high frequency and low information in their output signals compared to their input signals. RC filter is a common application for smoothing a signal.The RC circuit has a capacity and a resistor in which are connected in series. The charged capacitor would eat up its energy into the resistor placed in series with it. This voltage across the capacitor is imbed through Kirchhoffs current law which says that the current coming from capacitor is equal the current flowing out through the resistor. The linear differential eqn. can be gi ven byANALOG TO digital CARD elongate to Digital conversion is interfacinf the analog I/O with the Digital I/O. ADC cnversion takes place in three stages. They are Sampling, Quantisation and encoding. The ADC card which is used in the Project is CIO-DASO8/JR-A0.SAMPLINGThe analog input cannot be directly sent to the pc. The ADC digitises the analog input signal continusly. The proper reconstructive memory of signal is possible only when the sample rate is twice the highest frequency component. If the sampling rate is under that the problem of Alaising occurs.To eleminate the problems of aliasing the signal must be sampled at a rate higher(prenominal) than Nyquist frequency rate. The fig shows the sampling rates and the construction of the signal.If a signal is sampled at too low rate perfect reconstruction of signal is nt possible which results in the loss of data.QUANTISATIONQuantisation represents the signal in discrete and certainj voltage levels. Quantisation actually is approx imating the signals to the lowest possible range. The fig below shows the sampling of a singal which is then quatises indicated by a red line. The quantization is necessary as during the sampling the small range of signals may not be digitised. This results in loss of information. By approximating the esteems the reconstruction of signal is perfect.CODINGCoding is the process of converting the sampled signals to n bits which are represented by 0 and 1s. These bits represent certain voltage levels which is given by the resolution.SPECIFICATIONSWhen acquiring data to a computer, an analog to digital Conveter takes an analog signal and digitises the signal. The sigal is digitised to sertain binary numbers racket. These binary numbers represents respective voltage levels. Resolution refers to the number of binary levels ADC can represent a signal. The resolution of a n bit ADC can be by taking the value .The ADC card which is used in the Project is CIO-DASO8/JR-A0.DATA ACQUISITION AND CONTROL ARCHITECTUREData acquisition and cntrol architectlog input is given to the pc via ADC which converts the analog input to digital input. The data can be transmitted bidirectionally with the help of data acquisition device. Labview Software is loaded in the pc which acquires the data with the help of built in libraraies.INSTACALInstacal is software which manages the data acquisition hardware. It is used in calibration of the boards attached. It scans all the internal registers and the electronic equipment and if any fault found error messages are shown.The ADC is calibrated with the help of instacal to check whether the data logger is accurate or not.CHAPTER 5LABVIEWLabview environment is opened by when new VI is selected from the start up screen. The file menu contains commands for file manipulations. Edit menu is used to modify the block diagram and front panel objects. By disregard the undo or redo settings for a VI are 8. It can be manipulated as per the requirement.Opera te menu acts in running or stop a VI or to change the settings of VI. The tools menu acts as interface in communicating with the data acquisition boards to build the applications and in enabling the blade server.WINDOW INTRODUCTIONLabview programming is mainly divided into two panels. The first one is the Front Panel and all the controls and indicators are in lPC Monitoring of DynamometerPC Monitoring of DynamometerABSTRACTThe aim of the project PC MONITORING OF DYNAMOMETER is to measure and display the Speed Torque and Power of Motor. The behaviour of motor under load and no load characteristics have been studied with the help of virtual instrumentation. The variations in the motor Speed, Torque and Power at no load torque and full load torque have been analysed. Power determines the efficiency of the motor.Torque is varied by altering resistance in the dynamometer control circuit. The entire system will interface with a PC providing virtual instrumentation and data logging facil ities. The graphical programming software has been used to study the characteristics of the motor by loading. Data logging and analysis is done by implementing the concept of LabVIEW.AIMSThe aim of the project to build and develop the LabVIEW Program to acquire and analyse the data with the help of ADC card. Speed, Torque and Power of the shunt wound dc motor are acquired and analysed.OBJECTIVESImplement the concept of virtual instrumentation.Develop LabVIEW program to acquire Torque, Speed and Power.Analyse the motor characteristics under load and no load using the visual programming.To show the difference between acquiring the data manually and applying Virtual Instrumentation.Chapter 1 gives the introduction to the Motors, Labview and the literature review to realise the project.Chapter 2 is the study of Virtual Instrumentation and Labview programming.Chapter 3 explains the terms Torque, Speed Power asscociated with the shunt motor.Chapter 4 includes the experimental setup for t he project with the specifications and the individual work of each and every component.Chapter 5 discussion part includes the introduction to LabVIEW tools used in the programming for the project.Chapter 6 contains the analysis for the manual operation of the motor when load is applied. Includes Torque, Speed, and Voltage characteristics.Chapter 7 includes the labview program for Speed, Torque and Power with the analysis for motor under loaded conditions.Chapter 8 includes the conclusions and the future scope of the project.CHAPTER-1INTRODUCTIONThe extent to which electrical energy is used has influence on the development of industry and the economic prosperity of nation. Therefore rather than conserving the energy, methods need to be implemented to control the electrical energy and hence it can be possible only when the problems associated with the system are analysed and rectified with use of technology and time limitation.In industries the shunt wound motors are used where speed control is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum. The speed of rollers in large rolling mills is an very important aspect to be measured. In this type of application the rpm of each motor is measured and compared to setpoints.Under load motors draw more current which may damage the working capabilities of the motor thus causing damage. Hence there is a need for operating range for a motor to work even in extreme conditions. Characteristics such as Speed, Torque, Power, operating voltage and current are important for selection of motors. Power is the capability of the motor to do some work.The motor characteristics at high speed are highly different from that to low speeds. The power of motors is very low at high speeds consuming very less of electric distribution. The shunt wound type of motors run basically at a constant speed, regardless of load.In industries the shunt wound motors are used where speed con trol is a critical aspect. The shunt wound motors are highly flexible, versatile and even the operation costs are minimum.Motors runs at certain speed depending on the shunt field and armature. The armature produces the back EMF to maintain a certain speed as the shaft rotates. The back EMF is produced when the rotor rotates. As the load increases it causes the armature shaft to slow down and in this case the back EMF produced will be decreased.There are two methods for controlling the speed of a motor. The first one is by increasing or decreasing the voltage supply to the field. If less voltage is given the motor runs at low speed and as the voltage is increased the speed increases accordingly. The other method is by inserting resistance in the field circuit which makes the speed to vary upon changing the load. When load is increased apparently speed is decreased and vice versa. The change in load and speed torque and power can be acquired with the Software designed for acquisition and data analysis which is LabVIEW.LABVIEWLab view in short is for Laboratory Virtual Instrument Engineering Workbench. Labview is a very powerful and flexible instrumentation and analysis software developed by National Instruments. Labview is a programme particularly developed for engineers and scientists working in automation industry and data analysis.The principle Labview works is the data flow. They are broken into wires and nodes. The inputs and outputs are considered a node. It has got the built in libraries for Data Acquisition, Instrument Control and data analysis. Data acquisition is to measure electrical or physical quantities such as voltage, current, temperature, pressure, or sound. PC-based data acquisition is a combination of hardware, application software, and pc for logging the data.Software is highly important to data acquisition systems. The reduction of hardware can be done if an effective software is designed. Data Acquisition software collects the data and dis plays the data. Ease in data analysis and presentation are the major reasons for using the computers in data acquisition .LabVIEW can acquire accurate and timely measurements for monitoring industrial and control system applications. LabVIEW quickly connects to number of industrial sensors which acquires data at very high speeds. The tools provided in the LabVIEW can perform advanced signal processing, frequency analysis, digital signal processing. LabVIEW can also be applied for machine vision, motion control, and machine condition monitoringIn LabVIEW, the logic can be easily developed by using the drag drop graphical icons instead of writing lines of programs. Time taking programmes can be written in very short period using labview. This graphical language can be used in industrial applications to control instruments, build automated test systems, and acquire data virtually and many more.LITERATURE REVIEWThe literature on fundamentals and applications of data acquisition, instrum entation, and control to engineering and technology is very extensive.Peter T lee conducted experiments based on the torque-speed characteristics of a motor with the help of mechanical design and 3-D using the computer. The computer simulation was drawn from a mechanical model. Upon implementing the above methods a conclusion has been made on the torque- speed characteristics of dc shunt motor. The maximum speed of the motor is at no load applying zero torque. The stall torque represents a point where the motor is at zero speed. Dynamic and steady state response mathematical models were designed. The torque meter is used to calculate the torque. The torque speed curve obtained is is bit nonlinear. The mechanical design produced had few constraints which led to the nonlinearity of the curves.As described by Comer in dc electric motor control systems series motors develop high torques at very low speeds when compared to shunt motors. For a given voltage the speed-torque characteristic s show a linear decrease with the speed. Motor speed is controlled by controlling the voltage to the armature which involves construction of a circuit involving inverter amplifier, opamps, pulse width modulator which is confusing and rather time taking.Saffet Ayasun proposed Matlab and Simpower systems for studying the steady state and transient characteristics of electrical machines. Simulink models have been designed to control the speed in three ways. Simulink has been proposed for field resistance control, armature resistance control and armature voltage control. The conclusions drawn from the simulink modelling is that the electrical machines are perfectly integrated with the software.Pierre Guillemin proposed a technique based on fuzzy logic for controlling a dc motor. His work included on motors in food processing industries whose speed varies upon load. He worked on designing the fuzzy logic for the speed to be constant even though theres a much change in the load. The main methodlogy is top control the voltage involving the techniques of phase angle modulation and pulse width modulation. Use of fuzzy logic avoided the need for mathematical modelling. Real time test and acquisition has been done using the pc and eprom version of ST6 device has been used for controlling the fuzzy logic. So the main disadvantage of using ST6 is that it needs pages of text coding and has a instruction list of 40./pFrom the above proposed techniques we can conclude that it not only makes the system complicated but also it takes lot of time to design a program and create a logic for it to run. Manual way of operating may result in human errors decreasing the quality of product. Hence the need for data acquisition at high speed without much implementation of hardware components can be possible with the help of virtual instrumentation. Virtual instrumentation is the combination of modular software and I/O with software as its main tool.Today in any type of computer aided manu facturing project work and laboratory tests, precision and reliability of instrumentation and data acquisition techniques may cause major impacts on results and outcomes. Therefore, there is a need to gain knowledge and skills to obtain any type of physical or virtual data on manufacturing, testing, measurement, and protection areas.METHODOLOGYThe data has been acquired from a dynamometer motor system and is displayed on the pc for analysis involving a communication between hardware and software. The ADC card communicates between the systems with the help of a data cable. The conditioned signals are connected to the channels of the DAQ board. The hardware system is in conjunction with the PC running LabVIEW. LabVIEW contains front panel and the block diagram which displays the data acquired and further analysis can be done. The front panel and block diagram are responsible for the understanding of programming involved.CHAPTER-2VIRTUAL INSTRUMENTATIONVirtual Instrumentation is the co mbination of software, Input/Output hardware for the user desired applications. Sofware is the heart of Virtual Instrumentation. Instrumentation is basically divided into two types one is natural instrumentation and the other is Virtual Instrumentation. Natural instrumentation consists of hardware components and Virtual instrumentation is of Software with limited hardware components.The main difference between natural instrumentation and virtual instrumentation is that the software component of virtual instruments is more reliable and versatile when compared to the hardware components.TRADITIONAL INSTRUMENT VS VIRTUAL INSTRUMENTThe above Fig shows the difference between natural Instrument and a Virtual Instruments. In natural instrument a embedded chip is fixed to do a particular job which is not flexible whereas in a virtual instrument software can be modified and used for different applications as per the requirement.LabVIEWLabview stands for Laboratory Virtual Instrument Engineer ing Workbench. LabView is a visual programming language from National Instruments. The graphical language is originally named G. LabVIEW is used for data acquisition, industrial automation and instrument control. The programs in labview are called as virtual instruments .The graphical language can be easily identified by visual identification which makes it very easier to understand.Labview programs are termed as virtual instruments as they generally look and work as the instruments. Labview comes with a mechanism which allows data to pass between front panel and the block diagram.Labview is used by engineers and scientists to develop the sophisticated measurement, test, analyse control systems using graphical icons and wires. Labview can integrate with thousands of hardware devices and numerous built libraries are provided for analysis and data visualisationDATAFLOW PROGRAMMINGThe programming language used in LabVIEW is called G which is termed as a dataflow language. Labview Progr amme execution is determined by the way the block diagram is structured. Drawing wires are used to connect different function nodes. The information is transferred through the wires. The program is executed as soon as the input is available. G program is capable of parallel execution. The dataflow completely defines the execution sequence, and can be fully controlled by the programmer. The execution sequence is perfectly defined in Labview as defined in some software languages.GRAPHICAL PROGRAMMINGLabVIEW programs are called virtual instruments. Each VI has three componentsBlock diagramFront panelConnector pane.Data Flow is the principle for the VI execution. The VI are data driven whereas the normal text coding are instruction driven as specified by the programmer. When all the input data is available then the node starts executing and the processed data is supplied to the output terminals. The graphical language makes it very easier for the programmers in which virtual instruments can be dragged and dropped as per requirement. Stand alone applications can be built with the help of advanced labview development systems.The front panel serves as a user interface between the user and the pc. When front panel is dropped as a node onto the block diagram, the node inputs and outputs can be defined in with the help of connector pane.CHAPTER -3DC SHUNT MOTORA motor is a machine which converts electrical energy to mechanical or rotating energy. DC motors are basically divided into two types. Series motors and Shunt motor.Shunt Motor are the one in which the field is parallel to the load. In shunt motors the armature is mounted on the motor shaft. The rotating part in the dc motor is termed as the armature. The windings are located in the slots on the surface of the armature. When the current is supplied to the armature windings it creates a magnetic field that reacts with the field poles. Hence this magnetic field develops a torque which turn the rotor that is the arm ature. While the rotor rotates it induces a voltage which is opposite to the supplied voltage and hence emf is generated.At start the resistance is high and as the motor picks up the speed the resistance is reduced gradually. In manual start the resistance is controlled by the man at work whereas in automatic start of motor the armature voltage or current is taken into consideration and the resistance is corrected in the begging of start .The increase in armature voltage results in increase in speed and as the armature voltage is decreased the speed decreases. Torque is directly proportional to armature current. Increases in armature current causes the increase in torque.The rotation of the armature can be reversed by reversing the current direction.At start of the motor the current is high. As armature starts rotating the back emf increases gradually with the speed and the current decreases. When the speed of the armature comes to constant the back emf is stable approaching the ind uced voltage.If a mechanical load is applied the speed decreases and hence the counter emf decreases. This decreases in counter emf increases the differential voltage and thus increases the input current supply to motor.Torque is directly proportional to armature magnetic field strength. Armature magnetic field is directly proportional to armature current which in turn depends on mechanical load applied. Hence any increase in mechanical load increases the armature current and armature magnetic field strength and thus the Torque increases. Thus the speed of the motor decreases.DC motors are differentiated based on their voltage, torque, speed and power.TORQUETorque is the rotating force of the shaft of a motor. This rotating force is developed due to the interaction of magnetic field between field windings and the field poles. The torque of a motor can be determined by connecting it to prony brakeThe torque in general terms is the force exerted by the shaft of a motor. i.e if force i s applies to a lever which is free to rotate about one fixed point the lever will rotate unless restrained.The torque is defined as t=Fr or Frsin?. The torque which is produced in clockwise is called a clockwise torque and the torque which is obtained in anticlockwise is called anticlockwise torque.FULL LOAD TORQUEThe continous torque motor can support without overheating under the specified time rating is full load torque.PEAK TORQUEPeak torque is the maximum torque required at any point. Peak torque is delivered to motor without much overheating the motor. Peak torque is normally less than the stall torque.PULL OUT TORQUEThis is maximum torque of the rotating shaft when operated at high speed and full voltage. Pull out torque is also considered as the breakdown torque.STARTING TORQUETorque exerted by the motor when energized at full voltage with its shaft locked is starting torque. It is also termed as locked rotor torque.SPEEDThe motors convert electrical energy into mechanical e nergy. The rotational energy is used to lift things, propel things, turn things, etc. When a specific voltage is supplied to a motor, it rotates the output shaft at a particular speed. The angular velocity, is measured in rad/s, rps, rpm.Speed of a shunt motor can be controlled in three ways.Field Control MethodArmature Control MethodArmature Voltage Control methodFIELD CONTROL METHODIn field control method the speed of the armature is controlled by adjusting the field current. upto certain speed the counter emf and the speed remains constant. Field Control method is also termed as constant speed drive.ARMATURE RESISTANCE CONTROLIn Armature resistance control external resistance is inserted in the armature circuit for controlling the speed of motor. The insertion of resistance keeps the armature current constant in certain speed range. The main disadvantages using this techniques include powerloss in external resistance and overall low efficiency when speed is reduced to great exten t.ARMATURE VOLTAGE CONTROLArmature voltage control is preferred over the other methods as powerloss and low efficiency is avoided. In this method the shunt field current is kept constant while varying the armature voltage. Hence the armature current and the flux generated remains constant. At certain current the torque remains constant since armature current is directly proportional to torque. Thus the speed of the motor can be controlled to certain range.SPEED REGULATIONThe speed regulation for a dc motor is the ratio of change in speed from no load to full loadf load speed.POWERThe power of a motor is defined as the capability of motor to do given amount of work.Power of a motor depends on torque, speed of the shaft and the amount of time the time operates.Electric motors are rated generally on their maximum efficiency. Thus Greater the horse power of a motor greater is the working range. Operation of a motor more than rated horse power leads to overheating of the motor thus causi ng a stall. This may even damage the motor in the long run. The power of motor can be determined by connecting it to a dynamometer.DYNAMOMETERDynamometer is a device which measures force and power. Eddy current Dynamometer consists of a stator in which electromagnets and rotor disc are coupled to shaft of the engine .When a rotor is made to rotate the eddy currents are produced in the stator due to magnetic flux which is created by the filed current in electromagnets. This type of dynamometers requires some cooling arrangement as the eddy currents produced dissipates heat energy. The moment arm is used to measure the torque. In this kind of dynamometers the load is controlled by the regulation of currents in electromagnetic fields.Design CycleThe selection of appropriate hardware and software was an essential part of this project. The first section of this chapter 4 gives the information of hardware components of a system, the diagrams and specifications are discussed .The second pa rt of this chapter describes the hardware design process and software is described in the third section ,code used for the system are going to be presented.CHAPTER 4EXPERIMENTAL SETUPDC SHUNT MOTOR-WORKINGThe DC motor has two basic partsThe choosen shunt Dc motor is the motor which converts electrical power to mechanical power. The shunt motor is different from that of series motor. In the shunt type dc motor field winding is connected in parallel with the armature. The field winding is parallel to armature and this is referred as shunt winding and the motor is called a shunt motor.The rated rpm of the motor is 1500. The speed of the motor can be increased or decreased with the help of a drive. The current can be increased or decreased to set the speed. To reduce the speed of the motor mechanical load can be applied. Torque can be applied to reduce the speed of the motor. Under loaded conditions the speed of the motor reduces.Motor can be applied until it reaches the rated torque of the motor. If the load goes beyond the rated torque it starts drawing high curent and after some time it comes to stall.CHARACTERISTICS OF SHUNT MOTORShunt motors run at constant speed even when there is huge variation in the load. The Speed of the shunt-wound motors may be regulated in two ways. The first way is by putting resistance in series with the armature, through which the speed is decreased and the second method is by inserting resistance in the field by which the speed will vary as the motor is loaded.The characteristics of a shunt-wound motor is that it has a very good speed regulation, and is aconstant speed motor, though the speed slightly decreases as load is increased. Shunt-wound motors are used mostly in industrial and automotive applications where accurate measurement of Torque, Speed are highly necessary.EDDY CURRENT DYNAMOMETERA dynamometer is a device used to load the motor which also indicates the torque. The dynamometer used in this project works on hysteresi s brake principle. The dynamometer system mainly consists of three partsDynamometerTorque indicatorPower SupplyEddy current dynamometers are the actuated braking systems. This braking system develops load torque with the interaction from the dc magnetic field produced by the windings on the stator and induced eddy currents in the rotor. When the magnetic field is added around the rotor it causes eddy currents. These eddy currents help in slowing down the speed.Dynamometer01CJC.svgThe torque developed in the dynamometer is transmitted to the stator which is free to rotate over an arc and this is used to deflect a spring balance and so the torque can be directly measured on a scale. Eddy current dynamometer comes with a rotary potentiometer which works on the principleROTARY POTENTIOMETERRotary potentiometers come with a spiral resistive strip, and a wiper which moves axially as it rotates. As the wiper moves across the resistive strip resistance changes.VOLTAGE DIVIDERThe voltage div ider is used to know the output voltage when input voltage is given across the resistance. The ouput voltage depends upon the input voltage given and the resistor chosen. The resistor choosen is 10k? and an input voltage of 5v is given to the voltage divider.VOLTAGE DIVIDERThe input voltage is given across the termicals 1 and 2 and the output voltage is taken across the terminals 2 and 3.Connect the voltmeter across the resistance . Now switch the output voltage off and manipulate the input voltage to 5v. Now switch on the output toggle button on . The input voltage is set to 5v.AC TACHOMETERTachometers are used to measure the angular speed of a rotating shaft. The speed is measured in revolutions per minute (rpm). A tachometer works on the principle that it the speed of rotating shaft is determined by the variation in output frequency signal or voltage. As the speed increases the voltage level and the frequency increases.CONTACT TYPE AC TACHOMETERThe above fig shows the tachometer coupled to the motor. Ac tachometer used in the design is rated at 0.5v/100rpm. It shows that increase in speed increases. For every 100rpm variation the voltage increases by 0.5 rpm. The voltage signal from the ac tachometer is given to the simple presicion rectifier which further converts the signal to dc voltage.SIMPLE PRECISION FULL WAVE RECTIFIERA simple precision full wave rectifier converts the ac voltage to dc voltage. The simple precision full wave rectifier is built with operation amplifier which works on the principle of differential voltage.An operational amplifier is a DC-coupled high-gain electronic voltage amplifier which has differential inputs and a single output. Negative feed back controls the gain in the opamps. The output goes positive when the non inverting input(+) goes more positive than the inverting input (-) and vice versaWhen the input signal goes positive again, the op amps output voltage will take time to go back to zero, then to forward bias the diode and produce an output. The time taken is determined by the opamps slew rate. Slew rate is the maximum attainable range of the output voltage. Slew rate limits the highest frequency of the sin wave.The opamp 741 choosen in the project has a slew rate of 0.5v per micro secondsSIMPLE PRECISION FULL WAVE RECTIFIERThe negative voltage at the input through the diode and resistor. The positive half cycles appear at the output of the second diode. When positive voltage is given the feed back is given by the diodes and hence negative cycles . The positive cycles and negative cycles are summed differentially to get the output voltage.The opamp 741 choosen in the project has a slew rate of 0.5v per micro secondsFor measurement applications the signal has to be ripple free. Hence low pass filter can be used to achieve the signal free from ripples.RC LOW PASS FILTERResistor Capacitance generally termed as RC circuits are used in filtering a signal waveform, thus changing the relative amounts of high frequency and low information in their output signals compared to their input signals. RC filter is a common application for smoothing a signal.The RC circuit has a capacitor and a resistor in which are connected in series. The charged capacitor would discharge its energy into the resistor placed in series with it. This voltage across the capacitor is found through Kirchhoffs current law which says that the current coming from capacitor is equal the current flowing out through the resistor. The linear differential eqn. can be given byANALOG TO DIGITAL CARDAnalog to Digital conversion is interfacinf the analog I/O with the Digital I/O. ADC cnversion takes place in three stages. They are Sampling, Quantisation and encoding. The ADC card which is used in the Project is CIO-DASO8/JR-A0.SAMPLINGThe analog input cannot be directly sent to the pc. The ADC digitises the analog input signal continusly. The proper reconstruction of signal is possible only when the sampling rate is twice the highest frequency component. If the sampling rate is under that the problem of Alaising occurs.To eleminate the problems of aliasing the signal must be sampled at a rate higher than Nyquist frequency rate. The fig shows the sampling rates and the construction of the signal.If a signal is sampled at too low rate perfect reconstruction of signal is nt possible which results in the loss of data.QUANTISATIONQuantisation represents the signal in discrete and certainj voltage levels. Quantisation actually is approximating the signals to the lowest possible range. The fig below shows the sampling of a singal which is then quatises indicated by a red line. The quantization is necessary as during the sampling the small range of signals may not be digitised. This results in loss of information. By approximating the values the reconstruction of signal is perfect.CODINGCoding is the process of converting the sampled signals to n bits which are represented by 0 and 1s. These bits represent certain voltage levels which is given by the resolution.SPECIFICATIONSWhen acquiring data to a computer, an analog to digital Conveter takes an analog signal and digitises the signal. The sigal is digitised to sertain binary numbers. These binary numbers represents respective voltage levels. Resolution refers to the number of binary levels ADC can represent a signal. The resolution of a n bit ADC can be by taking the value .The ADC card which is used in the Project is CIO-DASO8/JR-A0.DATA ACQUISITION AND CONTROL ARCHITECTUREData acquisition and cntrol architectlog input is given to the pc via ADC which converts the analog input to digital input. The data can be transmitted bidirectionally with the help of data acquisition device. Labview Software is loaded in the pc which acquires the data with the help of built in libraraies.INSTACALInstacal is software which manages the data acquisition hardware. It is used in calibration of the boards attached. It scans all the internal registers and the electronic equipment and if any fault found error messages are shown.The ADC is calibrated with the help of instacal to check whether the data logger is accurate or not.CHAPTER 5LABVIEWLabview environment is opened by when new VI is selected from the start up screen. The file menu contains commands for file manipulations. Edit menu is used to modify the block diagram and front panel objects. By default the undo or redo settings for a VI are 8. It can be manipulated as per the requirement.Operate menu acts in running or stopping a VI or to change the settings of VI. The tools menu acts as interface in communicating with the data acquisition boards to build the applications and in enabling the web server.WINDOW INTRODUCTIONLabview programming is mainly divided into two panels. The first one is the Front Panel and all the controls and indicators are in l