We shall use the same dc motor for which the parameters were calculated in the previous experiment. This parallel configuration allows independent path of current for field winding and armature. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a dc motor. In order to measure the time response of a dc motor it is necessary to obtain transfer function of the dc motor. To obtain the armature voltage vs armature current load curve of the generator. To determine the load characteristics of dc shunt motor. The set up for speed control of dc shunt motor by armature voltage control method is shown in the figure. Therefore the voltage drops i a r a will be negligible as compared to the external supply voltage v. To obtain the performance characteristics of a dc shunt motor by load test. Speed control methods of dc shunt motor my tech info. Experiment 5 dc motor speed control walter scott, jr. By means of this method, the motor can be worked at any speed up to its maximum speed. That method is to change the terminal voltage of the motor. C shunt motor as a function of armature voltage, field current, and external.
So the voltage across armature is changed with the help of. List of requirementsequipmentexperimental panel system unit w 1. Hence dc shunt motors are typically used applications that. Speed control of dc motor shunt type aim a to study the speed control of dc motor below the normal range by armature resistance control and to plot speed vs armature voltage, characteristic. Jul 11, 2019 speed control of a dc motor is either done manually by the operator or by means of an automatic control device. Lab report of electrical machines for lab1 characteristics of dc shunt motor, lab 1. Working principle of dc shunt motor your electrical guide. To find the various parameters such as torque, input power, output power etc.
Same voltage is applied to both shunt winding and armature in this motor. The field of the shunt motor is supplied from a constantvoltage exciter e. We use this method to increase the speed of these motors above the base speed. When a current carrying conductor is placed in a magnetic field, it experiences a force. To control the speed of dc shunt motor by armature control method and field control method apparatus requirred. Speedcontrolofdcshuntmotor page 1 experiment no 9 aim. In this paper will be studying about the various speed control methods of a dc series motor. Tarun agarwal is the chief customer support officer at. Electrical machines lab report 12 eet2166 mmu studocu. This paper describes the speed control of a dc shunt motor using conventional controllers pid, imc and fuzzy logic controller based on matlab simulation program.
To discover the characteristic change in torque output of a dc shunt motor as it is loaded. Lathes, drills, boring mills, shapers, spinning, and weaving machines series motor. When the semiconductor element mosfet is in a conducting state switch closed, the diode of fig reverse biased and the input provides energy both to the load both in coil linearly charging. Field control method on separately excited dc motor. Dc power input is converted into mechanical power at the shaft motor. In this experiment, we will examine some key characteristics of a dc motor. Solved experiment d c shunt motor make conclusion rec sd control of dc shunt motor electric direct cur. You can sense the effect of speed control of dc motor in the movement of robotic vehicles, movement in elevators, movement in paper mils and so on when different types of dc motors.
It is a machine which converts electrical energy into mechanical energy. It would be called speed control of separately excited dc motor. As resistance increased, the value of the field current will reduce. We will use an scr silicon controlled rectifier dc drive to operate a dc motor, a handheld tachometer to measure the motor speed, ac and dc ammeters to measure the line current and motor current, and, finally, a prony brake to apply a mechanical load to the motor.
What you need is a variable dc power supply for this you need to know the ratings of the motor. This is different to speed regulation where the speed is trying to be maintained or regulated against the natural change in speed due to a change in the load on the shaft. The current in the field coil and the armature are independent of one another. To determine the efficiency of the given dc shunt motor by conducting load test. By varying the value of r we can vary the voltage across the armature. The coils in the shunt field are composed of many turns of small wire, resulting in low shunt field current and moderate armature current. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. Current commands for higheff iciency torque control of dc shunt motor s. To control the speed of dc shunt motor using armature control method. Current commands for highe ciency torque control of dc. If the dc line voltage is constant, then the armature voltage and the field strength will be constant. To study the properties of the separatelyexcited dc shunt generator under noload and fullload conditions 2. To obtain efficiency of a dc shunt machine using swinburns test.
Speed control of dc shunt motor with field and armature rheostat control 79 2. To draw the performance characteristics of the given dc shunt motor by conducting load test. Shunt dc motor the shunt motor is probably the most common dc motor used in industry today. Time response analysis of dc motor using armature control. The dc motor does not get any voltage when chopper ch is switched off. Speed control of dc shunt motor with field and armature rheostat. Motors plays an important role in energy conversion process. Electrical machinel dc laboratory manual grietelectrical and.
Performance of dc motors experiment 2 linkedin slideshare. To interpret the load characteristics of a dc shunt motor. Speed control of dc shunt motor with field and armature. Though there are separate branches for the flow of. To conduct a load test on dc shunt motor and to find its efficiency. The current commands for a high efficiency torque control of a dc shunt motor is described. A dc shunt motor also known as a shunt wound dc motor is a type of selfexcited dc motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor. To study the speed control of the given dc shunt motor by field control method and armature control method. Electrical machines for mechatronics laboratory 7 4 speed control of series dc motors unlike with the shunt dc motor, there is only one efficient way to change the speed a series dc motor. To control the speed of dc shunt motor using field control method. Types of dc motors dc motor are of 3 types they are 1. Maksimovic the purpose of this experiment is to become familiar with operating principles, equivalent circuit models, and basic characteristics of a dc machine. This article describes the construction of dc motor. The high number of turns allows a strong magnetic field to be generated, but the smaller gauge wires provide a high resistance and limit the current flowing through the shunt coil.
A mathematical model of the process has been developed using real plant data and then conventional controllers and fuzzy logic controller has been designed. Discussion a dc motor generator can run either as a motor or as a generator. Dec 25, 2017 in this video you will learn about speed control of dc shunt motor now you can join our whatsapp group. Electrical machines for mechatronics laboratory 6 5 if a ra. Speed control method of dc series motor shubham sharma, simran singh oberoi, siddharth nair ece dept, dronacharya college of engg abstract. Speed control of dc motor is the most important feature we interest in, when we control the speed we vary it according to the requirements and the operation we need. In the case of a dc motor, the magnetic field is produced by the field winding.
There is no difference in the construction of dc motor and generator. Dec 29, 2015 the shunt field windings of a dc shunt motor are made of smaller gauge wire, but they have many more turns than a serieswound dc motor. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. Title of the experiment page no 7 retardation test on dc shunt motor. Data for speed control of a shunt dc motor using alternating armature resistance.
On occasion, a field regulator is contained within the field circuit of dc shunt motor for additional speed adjustment. One of the most important features of the dc motor is that their speed can easily be control according to the requirement by using simple methods. Dc machines are most commonly used in control and servomechanism, as well as industrial, applications. In this lab experiment, the dc motor speed control was studied. The characteristics of a shunt motor reveal that it is an approximately constant speed motor. So the voltage across armature is changed with the help of a suitable switchgear devises.
The armature of the shunt motor m whose speed is to be controlled is connected directly to a d. Electric machines convert electrical energy to mechanical energy and viceversa, as shown in fig. D c shunt motor make conclusion sd control of dc shunt motor dc shunt motor experiment sd control of dc shunt motor. To obtain speed control of dc shunt motor using a armature resistance control b field. Connects the armature and fields windings shunt and series combination give characteristics both shunt and series dc. Pid controllers are widely used in industrial plants. In the proposed control method, the effect of a magnetic saturation and an. Brake test shunt motor theory brake test shunt motor viva with answers lab manual direct loading test shunt motor speed control shunt motor. This type of control can only be used for speed control below the rated speed. Pdf electrical machine lab i kis bose academia edu. Dc generator external characteristics of shunt generator 2 theory 2.
That is the reason behind naming it a dc shunt motor. Speed control of dc series motor by chopper electrical. The field of this motor is permanently connected across the dc supply lines. In shunt dc motors the variable resistance inserted as, field control method on shunt dc motor. In this paper speed control of the dc motor by armature control method is proposed.
The circuit is connected as shown in the circuit diagram. In a shunt motor, the field winding, as we ll as the armature winding, is connected in parallel shunt directly to the dc supply lines. In this method, the shunt field is connected to a fixed exciting voltage, and the armature is supplied with different voltages. Not down the corresponding armature voltage v2 and the speed of the motor. To study the methods of controlling the speed of shunt dc motor. In electrical terms, parallel is generally denoted as shunt. The aim of this this paper is to describe the principle of. At this point the motor will be running at very low speed. Apparatus type range quantity 1 voltmeter mc 0300v 1 2 ammeter mc 020a 1 3 rheostat 1250. To control the speed of dc motor with pid controller using matlabsimulink application. At present, variable voltage is achieved by scr controlled ac to dc converter unit is used to. Feb 05, 2018 for a dc shunt motor if the field is excited separately through a breaker than by controlling the armature voltage we can control the speed of the motor. Components of the shunt motor are the armature, labeled a1 and a 2, and the field, labeled f1 and f2. Transfer function is obtained by conducting the speed control test on the dc shunt motor 2.
The pulsewidth modulation method of control of semiconductor devices can help in controlling the output voltage of dc drives in turn controlling the speed for a wide range. As a result, these motors have excellent speed control 11. In experiment 3 and 4, the speed of the dc motor was controlled by using an openloop voltage control. At present, variable voltage is achieved by scr controlled ac to dc. Voltage control can be via a mosfet pwm circuit, or for mains powered application, scrs. The proposed work deals with optimal tuning of a proportionalintegralderivative pid controller for speed control of a dc shunt motor. The dc shuntwound motor, running on direct current, has its field windings placed in parallel to the armature. Depending on the motors design a tachometer system should be included. The problem with this method is that when we increase the resistance, the slope becomes steeper. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage.
Current commands for highe ciency torque control of dc shunt. Speed control of dc motor full guide for controlling the. To compare and analyze the result between the simulation result using a dc motor mathematical model in matlabsimulink and the experimental result using the actual motor. Dc shunt motor theory quiz questions electrician practice tests. Dc shunt motor speed control and analysis using ziegler. This paper presents modelling and numerical simulation as well as prototype for speed control of dc series motor using a dc chopper. This variable voltage is supplied by a motor generator set which consists of either a dc or an ac motor m2. The dc supply is switched on with minimum resistance in the field circuit and maximum value of r 1 in the armature circuit.
By applying a variable voltage across its armature, any desired speed can be obtained. A rheostat is connected in series with armature winding. Speed control of dc shunt motor and 3ph induction motor. Speed control of a dc motor using controllers science. In general, the field gets constant voltage, and the armature gets variable voltage to control the speed. Working principle of dc shunt motor, dc series motor and all other dc motors can be stated as follows. Dc motor is an electromagnetic device which converts electrical energy into mechanical energy.
View notes speedcontrolofdcshuntmotor from boston 6. The purpose of this experiment is to design and implement a closeloop speed control of a dc motor drive. This speed control is achieved through constant frequency control or variable frequency control. Jul 11, 2019 a dc shunt motor also known as a shunt wound dc motor is a type of selfexcited dc motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor. There are two types of controls which were made in order to control the speed as. These experiments consolidates the students knowledge of construction,operation and performance of dc. Study of speed control of dc series motor using dc chopper. Working principle from the above circuit diagram, we can conclude that if we want to increase the speed of the shunt motor, we will vary the field resistance. Though there are separate branches for the flow of armature current and field current. To observe the control characteristics obtained when. Speed control methods of dc motor shunt, series motors. In the past, wardleonard method is used for voltage control method. Introduction to electrical power and machines eet2166 uploaded by. View notes speed controlofdcshuntmotor from boston 6.
M1 is the main motor whose speed control is required. Construction and principle of operation of the shunt dc motor. Thyristor scr speed control of a dc shunt motor dspace repository thyristor scr speed control of a dc shunt motor. When chopper ch is switched on, the dc motor gets input supply voltage v dc. Automatic speed controller of a dc motor using arduino. Dec 08, 2017 i discuss the field resistance methos of speed control of dc shunt machinesthis lecture is a bit longbut it is worth it i have also put a summary of the lecture in pdf at this link here. Dc shunt motor armature the parallel combination of two windings is connected across a common dc power supply. Dec 11, 2016 history of dc motor michael faraday u. To design the pid controller and tune it using matlabsimulink. After ensuring step 2 and 3 switch on the dc supply through dpic, and start the motor through dc starter.
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