Speed control of dc shunt motor pdf merge

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. Electronic motor burnout protection shuts down the control if a prolonged overload condition exists. This method is done by inserting the variable resistance rc in series with the armature. Speed control of dc shunt motor with comparative analysis. Hence dc shunt motors are typically used applications that. Despite the load changes, shunt dc motor can maintain constant speed. Speed of a shunt dc motor can be easily controlled. Kimberley keller, in electrical safety code manual, 2010.

A motor s speed results from the signals average amplitude of a chopped voltage. Central composite design of experiments based experimental designed has been applied and number of experiments have been performed. When the driven load requires a wide range of speed control, both below and above the base speed, a dc shunt motor is employed. A compound dc motor connects the armature and fields windings in a shunt and a series combination to give it characteristics of both a shunt and a series dc motor. Hence the armature current differs and the speed of a dc shunt motor will continue constant which is shown in the fig dotted line ab. Conclusion in this lab experiment the dc motor speed control. As you know that the construction of any type of dc motor is very similar to a dc generator. C shunt motor as a function of armature voltage, field current, and external. Shunt dc motors electrical calculations and induction motor.

Speed control of dc motor shunt, series and compound. On the other hand, back emf reduces marginally more than that the. Pwm motordrive controllers chop sine waves or dc voltages into signals of varying frequency and duty cycle. Dc shunt motor speed control and analysis using ziegler. Dc motors are transducers because they convert electrical power pin into. In this paper a comparison is made for speed control of dc motor by using. 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.

There are two types of controls which were made in order to control the speed as. It should, however, be noted that by combining the two methods, speeds. Dc motor is enhanced by controlling both armature voltage. Whenever the shunt motor load is increased e b vi a r a and flux reduces as a result drop in the armature resistance and armature reaction. Dec 25, 2017 in this video you will learn about speed control of dc shunt motor now you can join our whatsapp group. The different methods of speed control in dc shunt motors are 1. In this lab experiment, the dc motor speed control was studied. A rheostat is connected in series with armature winding. This armature control method is based on the fact that by varying the voltage across the required voltage. In electrical terminology, a parallel connection is called shunt. Equivalent circuit of shuntexcited dc machine e a k.

This paper describes the speed control of a dc shunt motor using conventional. May 24, 2015 merits and demerits of rheostatic control method 1. Dc motors classes, speed control and starting of dc motors on photo. Speed control methods of dc motor shunt, series motors. The basic equation of the armature control method, n is. Many parameters can be obtained directly by using a motion controller, such. In electrical terms, parallel is generally denoted as shunt. In this work, a new hybrid algorithm has been developed by combining particle.

Drives without load and friction can not be controlled by emf speed feedback at all. Explain the effect of motor reaction in a dc generator. Speed control of shunt dc motor johurul islam academia. The field rheostat is connected in series with the shunt field circuit. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a dc motor. What are the methods for controlling the speed of a dc shunt. 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. Proportional p control which removes the delay and provides fast control. This system is used where very sensitive speed control of motor is required e. 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. This double dependence makes it impossible to keep the speed sensibly constant on rapidly changing loads.

Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. Mathematical modeling of dc shunt motor dc shunt motors have the field coil in parallel shunt with the armature. Factors controlling motor speed it has been shown earlier that the speed of a. 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 voltage applied to the motor may be reversed by backing the field current of generator through controller fc. When constant speed service at low speeds is required, dc shunt motors are preferred over synchronous motors. That is the reason behind naming it a dc shunt motor. Once the motor reaches its full speed, it remains constant. Speed control of dc shunt motor with field and armature rheostat control 79 2. Before discussing the speed control of dc motor, let us first establish the expression of the speed of a dc motor.

Lathes, drills, boring mills, shapers, spinning, and weaving machines series motor. The characteristics of a shunt motor reveal that it is an approximately constant speed motor. Therefore the voltage drops i a r a will be negligible as compared to the external supply voltage v. Speed control of dc shunt motor using 12 pulse rectifier. May 25, 2015 factors controlling motor speed 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. Active bridge limits the ac line inrush current when power is turned on and also prevents high speed runaway if the power transistor shorts. Since load is very small in a shunt motor, armature current is also very low. Bc354 pwm dc motor speed control installation and operating. 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. Pdf this paper describes the speed control of a dc shunt motor using conventional controllers pid, imc and.

A shunt dc motor has good speed regulation even as the load varies. Speed control of dc shunt motor with field and armature. The current in the field coil and the armature are independent of one another. Comparative analysis of speed control techniques of dc motors. Speed changes with every change in load, because speed variations depend not only on controlling resistance but on load current also. Speedcontrolofdcshuntmotor page 1 experiment no 9 aim. Find resistance to be added to the field circuit to increase speed to rpm at an armature current of 80 a. Nov 01, 2001 pwm motor drive controllers chop sine waves or dc voltages into signals of varying frequency and duty cycle. Speed control methods of dc shunt motor my tech info. Therefore, for constant speed drives in industry dc shunt motors are employed. P3 odd semester examination 2019 department of eee, university of rajshahi name of the instructor. In a shunt dc motor, the armature and field windings are linked in parallel. 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 it is strongly recommended to equip hoist drives with analogue tacho or encoder. A motors speed results from the signals average amplitude of a chopped 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. The motor back emf eb and speed of the motor can be changed.

As resistance increased, the value of the field current will reduce. Figure 1 shows a simplified pwm drive controller schematic for a dc motor. The dcs800 solution the dcs800 control structure can fit to the demands of series wound motors. Construction and principle of operation of the shunt dc motor. Tarun agarwal is the chief customer support officer at. Speed control of shunt and separately excited dc motors by armature current control method. The controllers input converter rectifies ac line voltage and filters it into dc. The set up for speed control of dc shunt motor by armature voltage control method is shown in the figure. Among the three types of dc motors, such as series, shunt and separately. By varying the value of r we can vary the voltage across the armature. In the case of a dc motor, the magnetic field is produced by the field winding. Speed control of shunt motors i variation of flux or flux control method it is seen. C shunt motor as a function of armature voltage, field current, and external resistance in the armature circuit. 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.

In this post, we will discuss about various speed control methods of dc shunt motor. The armature of the shunt motor m whose speed is to be controlled is connected directly to a d. To study the methods of controlling the speed of shunt dc motor. Though there are separate branches for the flow of armature current and field current.

The shunt motors are used where constant speed is required and starting conditions are not severe. Dc motors provide excellent speed control for acceleration and deceleration with effective and simple torque control. May 18, 2016 speed control of dc shunt motor sanjeev jamge. Working principle of dc shunt motor your electrical guide. 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. The 512c provides effective torque and speed control of permanent magnet or. The compound motors are used where higher starting torque and fairly. M1 may be any ac motor or dc motor with constant speed.

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. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power. On occasion, a field regulator is contained within the field circuit of dc shunt motor for additional speed adjustment. Thyristor scr speed control of a dc shunt motor dspace repository thyristor scr speed control of a dc shunt motor. These generators combine the characteristics of series and shunt generators. Short circuit protection protects control from a short circuit at motor connections. Hence dc shunt motors are typically used applications that require five or more horse power 8. This parallel configuration allows independent path of current for field winding and armature. The voltage equation of a dc motor is where e b is the back emf, v is the supply voltage, i a the armature current, and r a is the armature resistance again, the expression of back emf in a dc motor is where.

The controller output is now increased in a step from 100 to 120 v. This paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations. Pdf speed control of a dc motor using controllers researchgate. Speed control of a dc motor using controllers science publishing. Title of the experiment page no 7 retardation test on dc shunt motor. The dc shuntwound motor, running on direct current, has its field windings placed in parallel to the armature. An efficient method for speed control of dc shunt motor using. On combining equation 5 and equation 12 we get a new equation shown in fig. The field of the shunt motor is supplied from a constantvoltage exciter e. Armature control of dc series motor speed adjustment of dc series motor by armature control may be done by any one of the methods that follow, 1. The various applications of dc shunt motor are in lathe machines, centrifugal pumps, fans, blowers, conveyors, lifts, weaving machine, spinning machines, etc.

Speed control of dc motor shunt motor and series motor. The serieswound motor in this type figure 1 the field is in series with the armature. Working principle of dc shunt motor, dc series motor and all other dc motors can be stated as follows. This research will be focused to judge the performance of dc shunt motor by the implementation of different kinds of controllers such as. As stated above this method will increase the losses. Merits and demerits of rheostatic control method 1. Speed control of dc series motor can be done either by armature control or by field control. Combined armature and field speed control of dc motor for. 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. This motor is used when both a high starting torque and good speed regulation is needed. 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. Keywordsseparately excited dc motor, speed control of. Same voltage is applied to both shunt winding and armature in this motor.

Pdf design, development and comparison for speed control of. When the load increases the armature tends to slow down. Applications of dc machines motors and generators circuit. For this reason, they are increasingly used as a tool for joining components. The speed of a shunt motor can be changed by flux control method.

The curve becomes steeper and the speed decreases rapidly as the resistance is increased. The fact that the power supply of a dc motor connects directly to the field of the motor allows for precise voltage control, which is necessary with speed and torque control applications. When a current carrying conductor is placed in a magnetic field, it experiences a force. View notes speedcontrolofdcshuntmotor from boston 6. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. The arrangement of this system is as shown in the figure at right. By means of this method, the motor can be worked at any speed up to its maximum speed. This kind of winding is called shunt winding and the motor shunt dc motor creation and principle of operation of a shunt dc motor is same as any other dc motor. Measurement of efficiency of shunt and series motors.