It will be helpful to vary the speed of the dc motor in either clockwise or in anti clockwise direction. Various types of losses that occur in dc machines and how to calculate efficiency vi. Hence dc shunt motors are typically used applications that. Dc motor speed control using arduino the engineering projects. Thyristor scr speed control of a dc shunt motor dspace repository. Thyristor scr speed control of a dc shunt motor dspace repository thyristor scr speed control of a dc shunt motor. Apr 10, 2017 in this tutorial, i have controlled its speed as well by providing different voltage levels at the enable pin of the dc motor control driver l298. Direct current is applied to the armature by means of a carbon brush or by means of electromagnetic induction.
Shunt dc motors electrical calculations and induction motor. Find powerpoint presentations and slides using the power of, find free presentations research about speed control of a dc shunt motor ppt. Speed control of dc shunt motor your electrical guide. Voltage control can be via a mosfet pwm circuit, or for mains powered application, scrs. Another set up consisted of half bridge rectifier consisting of thyristor wherein the speed control for the same dc motor was carried. Speed control dc motors pdf speed control of shunt motor. By decreasing the flux, the speed can be increased and vice versa. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a dc motor.
Both motor control and grid applications use the rotating reference frame to control currents in the socalled dq rotating coordinate system. As resistance increased, the value of the field current will reduce. Mod01 lec32 lecture32speed control of dc shunt motors. E b vi a r a here, eb back emf, in volts ia armature current, in amps ra armature resistance, in ohms v terminal voltage, in volts. Another set up consisted of half bridge rectifier consisting of thyristor wherein the speed control for the same dc motor was carried out using the firing angle of the thyristor. Speed control of dc motor the speed of a dc motor is given by i flux control. The deceleration time depends on the accel setting. This system is used where very sensitive speed control of motor is required e.
This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. 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. This reduction in the counter emf or the back emf e b results in the increase of the net voltage. In general, the field gets constant voltage, and the armature gets variable voltage to control the speed. In this lab experiment, the dc motor speed control was studied. By means of this method, the motor can be worked at any speed up to its maximum speed. The concept of the speed regulation is different from the speed control. Characteristics of generators and parallel operation of generators iv.
Tarun agarwal is the chief customer support officer at edgefx technologies pvt ltd. In this post, we will discuss about various speed control methods of dc shunt motor. 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. So, lets get started with dc motor speed control using arduino uno. Since load is very small in a shunt motor, armature current is also very low. This item appears in the following collections higher diploma in electrical and electronics engineering 22 projects for higher diploma in electrical. Accel acceleration allows adjustment of the motor acceleration from a minimum of 0.
Range broader speed cenderung menghasilkan ketidakstabilan dan miskin pergantian. Power low in dc motor copper loss in armature, field and series windings. 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. In this lesson aspects of starting and speed control of d. This is also well known that the dc machines can be used as a generator as well as as a motor, their is the difference of operation in both case i. This paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations. As an example, a speed controller for a shunt motor built and tested by the author is discussed. Calculate the speed with increased load with the armature current of 50 amp. Sebagai contoh, jika arus exciting dari motor shunt sengaja. These methods as applied to shunt, compound and series motors will be discussed below. Speed control of shunt excited motors a by changing field resistance b by changing armature voltage field control voltage control motor starting to limit the starting current, the motor must be started. Speed control of dc motor is achieved using different methods.
Methods for speed control of dc motors and applications of dc motors v. 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. When a current carrying conductor is placed in a magnetic field, it experiences a force. In order to change the speed, we have to change flux. Armature voltage control is used to control the motor speed below the rated speed. This paper describes a matlabsimulink realization of the direct current dc motor speed control method by controlling the voltage applied to the field circuit of a separately excited dc motor in.
The dc machine can operate as a generator and as a motor. The basic behavior of the dc motor is discussed, along with traditional and modern techniques of speed control. The different methods of speed control in dc shunt motors are 1. Speed control of dc motors pdf the l292 is designed primarily for use with an l290 and l291 in dc motor servo. Generally, a dc motor consists of either an electromagnet or a permanent magnet and a wounded coil known as the armature. Di bawah kondisikondisi abnormal tertentu, flux mungkin akan drop ke nilai rendah yang berbahaya. This can be achieved by changing the field current. The arrangement of this system is as shown in the figure at right. On occasion, a field regulator is contained within the field circuit of dc shunt motor for additional speed adjustment. The set up for speed control of dc shunt motor using flux control technique is shown in the figure. Describe briefly the method of speed control available for dc motors. Once the motor reaches its full speed, it remains constant. Sir i want to control the speed of 220v dc shunt motor using same technique.
Isolated current shunt and voltage measurement for motor. And the armature winding is connected to external supply voltage hence it plays the role of current carrying conductor. Torque control of a shunt wound and dc motor of an electric vehicle. Working of control panel for the speed control through armature control and field control we will be using face plate type starter also in order to limit the starting current, also otherwise higher capacity of armature control rheostat will be required. Untuk shunt wound motors, metode dari speed control memungkinkan high speed base speed rasio setinggi 3. It has been shown earlier that the speed of a motor is given by the relation it is obvious that the speed can be controlled by varying i fluxpole, f flux control ii resistance ra of armature circuit rheostatic control and iii applied voltage v voltage con trol. Lathes, drills, boring mills, shapers, spinning, and weaving machines series motor. Tarun agarwal is the chief customer support officer at. Despite the load changes, shunt dc motor can maintain constant speed.
Flux control method speed is inversely proportional to. So can you please me what all the changes i need to make in the circuit as well as the code for the microcontroller. Therefore the voltage drops i a r a will be negligible as compared to the external supply voltage v. The direct current dc motor is one of the first machines devised to. Jul 11, 2019 speed control of a dc motor is either done manually by the operator or by means of an automatic control device. The l292 is designed primarily for use with an l290 and l291 in dc motor servo. Equivalent circuit of shuntexcited dc machine e a k.
Dc motor speed control using pic microcontroller pwm method. There are two types of controls which were made in order to control the speed as well as the current. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. 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.
Therefore speed of the 3 types of dc motors shunt, series and compound can be controlled by changing the quantities on the righthand. Speed control of dc shunt motor with field and armature. Speed control of dc motor shunt, series and compound categories electrical machines, alternator, dc generator, dc motor, electric vehicles, instrumentation. Working principle of dc shunt motor, dc series motor and all other dc motors can be stated as follows. A chopper is a particular kind of static device which is adept in converting fixed dc voltage to variable dc voltage. Though there are separate branches for the flow of armature current and field current.
In the case of a dc motor, the magnetic field is produced by the field winding. Working principle of dc shunt motor your electrical guide. Speed control methods of dc motor shunt, series motors. View and download powerpoint presentations on speed control of a dc shunt motor ppt. I hope it will help me a lot to understand the speed control technique of dc motor. C shunt motor as a function of armature voltage, field current, and external resistance in the armature circuit. Find resistance to be added to the field circuit to increase speed to rpm at an armature current of 80 a. 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. Apr 16, 2017 you need to power the field and armature separately. In the armature control method, the speed of the dc motor is directly proportional to the back emf eb and eb v iara.
In this tutorial, i have controlled its speed as well by providing different voltage levels at the enable pin of the dc motor control driver l298. The current components become quasidc and the control are simplified to a low requirement in bandwidth. He has 8 years of experience in customer support, operations and administration. As you know that the construction of any type of dc motor is very similar to a dc generator. M1 may be any ac motor or dc motor with constant speed.
The upper speed is limited by the commutator and brushes structure. Regulation of the currents of the d and q axes requires at least two phase current measurements. When supply voltage v and armature resistance ra are kept constant, the speed is directly proportional to armature current ia. Such a fine speed control is generally not possible with a. View notes speedcontrolofdcshuntmotor from boston 6. As the rotating speed of dc shunt motor depends on armature voltage and field current applied to the shunt motor, therefore, these two process parameters were varied during experimentation. Speed control of dc shunt motor with field and armature rheostat control 79 2. What are the methods for controlling the speed of a dc. In this method an external variable resistance r x is connected in series with the armature. What are the methods for controlling the speed of a dc shunt. Speed control of dc shunt motor for electric car use by. N, given by, this can be graphically explained below. Speed control methods of dc shunt motor my tech info.
Speed control of dc motor shunt, series and compound. 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. Jul 10, 2012 mod01 lec32 lecture32 speed control of dc shunt motors nptelhrd. The voltage applied to the motor may be reversed by backing the field current of generator through controller fc. Mod01 lec32 lecture32speed control of dc shunt motors nptelhrd. Comp speed regulation adjusts the control output to compensate for speed changes caused by varying motor loads. Consider a shunt motor rotating at 1200 rpm that is fed by a 120v source. Dec 25, 2017 in this video you will learn about speed control of dc shunt motor now you can join our whatsapp group. Dc shunt motor speed control and analysis using ziegler. Dc motor speed control using arduino the engineering. In an open loop control, the only components in the system. You need to power the field and armature separately. Central composite design of experiments based experimental designed has been applied and number of experiments have been performed. Speedcontrolofdcshuntmotor page 1 experiment no 9 aim.
Speed control of shuntexcited motors a by changing field resistance b by changing armature voltage field control voltage control motor starting to limit the starting current, the motor must be started. In this chapter, speed control of a dc motor using pulse width modulation pwm technique is described. To study the methods of controlling the speed of shunt dc motor. In fact, fine speed control is one of the reasons for the strong competitive position of d. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power. The most simple so lution is with one pwm continuously on low or high and the other pwm varying. Conclusion in this lab experiment the dc motor speed. As a result, these motors have excellent speed control 11.
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. Various types of losses that occur in dc machines and. The speed control below the rated speed control is not possible using this type of control. Speed of a shunt dc motor can be easily controlled. The phenomena of armature reaction and commutation iii. The current in the field coil and the armature are independent of one another.
A power semiconductor device is used as a switch in the overall chopper circuitry. Untuk shuntwound motors, metode dari speed control memungkinkan highspeedbasespeed rasio setinggi 3. Therefore speed of the 3 types of dc motors shunt, series and compound can be controlled by changing the quantities on the righthand side of the equation above hence the speed can be varied by changing. Speed control of the separately excited dc machine. The characteristics of a shunt motor reveal that it is an approximately constant speed motor. To control a motor, see figure 3, there are 2 pwms necessary.
Fuzzy logic based speed control of dc motor is designed. Fuzzy controller based speed control of dc motor file. The dc motor converts the mechanical power into dc electrical power. Pdf this paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations. The terminal voltage of the armature, v the external resistance in armature circuit, r a the flux per pole. An efficient method for speed control of dc shunt motor. When the load increases the armature tends to slow down.