Homework statement a 250v shunt dc motor runs at rpm while taking a current of 25 a. Working principle of dc shunt motor, dc series motor and all other dc motors can be stated as follows. Your reports should follow the prescribed format, to give your report. As resistance increased, the value of the field current will reduce. In an open loop control, the only components in the system. Speed control of dc shunt motor with field and armature. Speed control methods of dc shunt motor my tech info. With the contribution of converter the efficiency and speed control ranges is enhanced to great. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage.
In a shunt motor, the field winding, as we ll as the armature winding, is connected in. 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. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a dc motor. To observe the zero initial condition response, set these values to zero. Experiment 5 dc motor speed control walter scott, jr. Dc motor control tutorials home the engineering projects. Speed control methods of dc motor speed control of shunt motor 1. Pdf this paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations. The spring balance should kept at zero position throughout the experiment.
Ee 448 laboratory experiment 4 introduction to dc motors 4 assuming shunt connected dc motor, compute back emf, field resistance, armature resistance, field loss, armature loss, power efficiency, starting torque, and noload 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. C shunt motor as a function of armature voltage, field current, and external resistance in the armature circuit. 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 range of speed control and robust working adds to the usefulness of the dc motors. Set the shunt field rheostat control knob at its full cw position for. Speed control of dc shunt motor with field and armature rheostat. Speed control of dc shunt motor armature, field control. Speed of dc motor can be varied by following methods armature voltage control for below base speed field flux control for above base speed armature resistance control here, we are using armature voltage control method for speed control. Therefore the voltage drops i a r a will be negligible as compared to the external supply voltage v. As dc power can be easily transported, dc motor contributes a lot to traction drives. To study the speed control of dc shunt motor by varying. The performance of speed regulation of ac motor can compare with that of dc motor after the foc.
The different methods of speed control of dc shunt motor are flux control method, armature control method and voltage control method. Such a fine speed control is generally not possible with a. 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 free download as pdf file. Towards to establish speed control, many tested have been taken place.
Tieit bhopal, mp udit narayan student of be, tieit, bhopal, mp akash verma student of be, tieit, bhopal, mp abstract. B simulink block of pid control dc motor experiment 77. Speed control of dc shunt motor and 3ph induction motor. In this section of dc motor projects, i will provide you the list of the tutorials in which i have already controlled the speed of the dc motor using. Thus flux can be controlled by adding a rheostat variable resistance in series with the shunt field winding, as shown in the fig. Dc shunt motor speed control and analysis using ziegler. Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. In this post, we will discuss about various speed control methods of dc shunt motor. Tarun agarwal is the chief customer support officer at edgefx technologies pvt ltd. Because of their selfregulating speed capabilities, dc shunt motors are ideal for applications where precise speed control is required. Dc shunt motor speed control and analysis using ziegler nichols algorithm with pid controller yogesh sharma l,a shis patra 2 1, 2 electrical engineering department, m.
This technical document is a series of laboratory manuals of electronics and. The flux is dependent on the current through the shunt field winding. The machine used in this experiment is a representative of an industrial dc motor or generator with a rated power of tens of kilowatts. The purpose of this experiment is to obtain the load characteristics of dc motors. In the case of a dc motor, the magnetic field is produced by the field winding. That method is to change the terminal voltage of the motor. In fact, fine speed control is one of the reasons for the strong competitive position of d. This method is similar to armature rheostat control method of dc shunt motors. By means of this method, the motor can be worked at any speed up to its maximum speed. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. 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. He has 8 years of experience in customer support, operations and administration.
Electrical machines for mechatronics laboratory 6 5 if a ra. Calculate a the speed when the load current is 50a. 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. These emfs are applied at the rotor by a suitable source whose frequency should be same as slip frequency. Speed control of dc shunt motor x4e60d9pz9n3 idocpub.
Below in summary charts torque to duty cycle are presented in the cases scenarios. Introduction to dc motors 1 ee 448 lab experiment no. Motor speed control laboratory equipment and software required. The dc shunt motor is 120vdc with rated speed of 1800 revolutions per minute. Dc motors consist of one set of coils, called armature winding, inside another set of coils or a set of permanent magnets. Speedcontrolofdcshuntmotor page 1 experiment no 9 aim. To study the speed control of the given dc shunt motor by field control method and. The supply is switched off after experiment is over. Using pi controllers to smoothen the voltage applied to the motor.
To study the speed control of a dc shunt motor by the following methods. Speed control of dc motor using pid controller based on matlab aditya pratap singh asst prof, ex dept. Where,va is the voltage applied across the armature, n is the rotor speed and. By decreasing the flux, the speed can be increased and vice versa.
This paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations. When a current carrying conductor is placed in a magnetic field, it experiences a force. Speed control of dc motor using chopper slideshare. Because of its constant running speed, the synchronous motorgenerator will be used to. In this experiment the mechanical characteristics b and j will be determined. To control the speed of dc shunt motor using armature control method. Speed control of dc shunt motor with field and armature rheostat control 79 2. To study the methods of controlling the speed of separately excited dc motor. The flux of a dc motor can be changed by changing ish with help of a shunt field. As a result, the optimize of the control can be realized very difficultly in the speed control.
This item appears in the following collections higher diploma in electrical and electronics engineering 22 projects. From this formula it follows that the speed of a shunt d. Automatic speed controller of a dc motor using arduino. 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. It would be called speed control of separately excited dc motor. Keep in mind, however, that they cannot produce high starting torque, so the load at startup must be small. You need to power the field and armature separately. Though there are separate branches for the flow of armature current and field current. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power.
In general, the field gets constant voltage, and the armature gets variable voltage to control the speed. As indicated by the speed equation, the speed is inversely proportional to the flux. Electrical machinel dc laboratory manual grietelectrical and. The voltage applied to the motor may be reversed by backing the field current of generator through controller fc. Speed control of dc motor using pid controller based on matlab. Assuming stator flux to be linear function of field current, determine the constant kk f. Speed control of dc motor the speed of a dc motor is given by i. 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.
Thyristor scr speed control of a dc shunt motor dspace repository thyristor scr speed control of a dc shunt motor. 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. There are two types of controls which were made in order to control the speed as well as the current. Instead of applying the resistance into the rotor circuit of the motor, the speed can be varied by applying emfs into the circuit. Armature voltage control is used to control the motor speed below the rated speed. These methods as applied to shunt, compound and series motors will be discussed below. View notes speedcontrolofdcshuntmotor from boston 6. Speed control of dc shunt motor electric motor direct current. On occasion, a field regulator is contained within the field circuit of dc shunt motor for additional speed adjustment.
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