Automation results into better quality, increased production an reduced costs. Speed control of dc shunt motor and 3ph induction motor. Speed control of dc motor the speed of a dc motor is given by i flux control. That method is to change the terminal voltage of the motor. To obtain the characteristics of speed control by the above mentioned methods. Speed control methods of dc motor speed control of shunt motor 1. K e b o where, kconstant this shows the speed of a dc motor is directly proportional to the back emf and inversely proportional to the flux per pole. For example, in a shunt motor, placing a resistance in series with the shunt field reduces. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. To control the speed of dc shunt motor using armature control method. Load characteristics of dc shunt and compound motor. C shunt motor as a function of armature voltage, field current, and external resistance in the armature circuit. The rotor speed of dc motor can be made to follow an arbitrary selected.
A flux control method of dc shunt motor the flux of dc motor is a function of field current i sh. The term project develops a speed control system for a direct current dc motor. Explain two advantages of the electric drive system of the electric motors. Speed control of dc motor using pulsewidth modulation. Variations of speed with armature voltage control at constant field current.
Experiment 5 dc motor speed control it is prefered that students answer the questions before doing the lab because that provides the background information needed for this lab. What are the methods for controlling the speed of a dc shunt. The variable speed drives, which can control the speed of a. The set up for speed control of dc shunt motor using flux control technique is shown in the figure. Load test on singlephase transformer and three phase transformer connections. 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. Chopper is a device that gives variable dc output from applied fixed dc input. This method is applied to control the motor speed 1. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. The different methods of speed control of dc shunt motor are flux control method, armature control method and voltage control method. Jul 11, 2019 speed control of a dc motor is either done manually by the operator or by means of an automatic control device. 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. Variation of speed with variation of field current at constant voltage.
Open circuit and short circuit tests on single phase transformer. The different methods of speed control in dc shunt motors are 1. This can be achieved by changing the field current. Speed control of dc shunt motor free download as pdf file. Jan 29, 2017 this video teach you to understand the speed control method of dc shunt motor with practical demonstration. Such a fine speed control is generally not possible with a. Conclusion in this lab experiment the dc motor speed control. This research project focuses on the speed control of the wound field dc motors which include shunt, series and separately excited field resistance. In fact, fine speed control is one of the reasons for the strong competitive position of d. The motor is brought to its rated speed by varying the motor field rheostat. To obtain speedtorque characteristics of a dc shunt motor. 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.
Swinburnes test and speed control of dc shunt motor. In this lab experiment, the dc motor speed control was studied. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. As supply voltage is constant the i sh can only varied by inserting extra resistance in the field circuit. 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. Controlling the speed of dc motor can be done by different ways like using a potentiometer and also by a controlled current to the armature. 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. Speed control of dc shunt motor electric motor direct current. Electrical machinel dc laboratory manual grietelectrical and. It simply chops fixed dc and generates variable dc.
Pdf laboratory manual electrical machines ayyappa javangula. Pdf speed control of dc motor by using pwm technique. By decreasing the flux, the speed can be increased and vice versa. The lab is equipped with dc seriesshunt motor, compound motor, universal motor. To control the speed of dc shunt motor using field control method. For this project neural network technique, in speed control is used for a separately excited dc motor. This decreases i sh and hence flux ecrease in flux increases speed. In many different applications it is required to control speed of dc motor. Dc motor speed control using chopper engineersgarage. Keep in mind, however, that they cannot produce high starting torque, so the load at startup must be small. Speed control of dc shunt motor with field and armature.
As resistance increased, the value of the field current will reduce. Experiment 5 dc motor speed control walter scott, jr. In order to change the speed, we have to change flux. Pulsewidth modulation pwm or dutycycle variation methods are commonly used in speed control of dc motors. Let us first understand how it generates variable dc.
Other motors series, shunt, compound wound dc motors. May 18, 2016 horizontal split casing pumps 3d installation manual duration. The dc petitive with dc motors in speed control applications. Applications that meet these criteria and are suitable for dc shunt motors include machines tool such. Welcome to channabasaveshwara institute of technology. Hence this method is used to increase the speed above rated speed. To obtain speed control of dc shunt motor using a armature resistance control b field control. Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. Horizontal split casing pumps 3d installation manual duration. Apart from these techniques, pulse width modulation is the effective way to implement motor speed control. The field current can be changed by changing the rheostat r connected in series with the field. Speed control of dc shunt motor your electrical guide.
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. The flux of a dc motor can be changed by changing ish with help of a shunt field. 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. Set the shunt field rheostat control knob at its full cw position for. 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. Apparatus name range type quantity 1 ammeter 0 2a mc 01 2 voltmeter 0 300v mc 01 3 rheostat 370. Speed control of dc motor full guide for controlling the. The duty cycle is defined as the percentage of digital high to digital low plus digital high pulsewidth during a pwm period. In a shunt motor, the field winding, as we ll as the armature winding, is connected in.1407 108 1467 774 453 1089 89 175 903 1268 1350 938 484 163 813 39 891 1199 1010 357 1239 1407 938 1360 1304 14 1429 605 475 289 1438 995 561 1242 539 753 996 1157 288 1158 1141 989 303 154 198