May 27, 20 dc shunt motor speed control armature control method. In dc shunt motor the armature and field winding are connected in parallel across the supply voltage the resistance of the shunt winding. The power supply of a dc motor connects directly to the field of the motor which allows for precise voltage control, speed and torque control applications 3. Armature resistance control and field flux control the dc motor converts the mechanical power into dc electrical power.
An efficient method for speed control of dc shunt motor. Though there are separate branches for the flow of armature current and field current. Load test on dc shunt motor offered by unicon instruments, a leading supplier of dc shunt motor in sadar bazar, ambala, haryana. Modern dc motors are often controlled by power electronics systems which adjust the voltage by chopping the dc current into on. Its operation is based on the principle that when a current carrying conductor is placed in a. The upper speed is limited by the commutator and brushes structure. The different methods of speed control in dc shunt motors are 1. Pdf online speed control of the shuntconnected dc motor. 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.
Because of their selfregulating speed capabilities, dc shunt motors are ideal for applications where precise speed control is required. Dc shunt motor armature the parallel combination of two windings is connected across a common dc power supply. The company was incorporated in 1954 and is registered with indiamart. Speed control of dc shunt motor by armature control. Keep in mind, however, that they cannot produce high starting torque, so the load at startup must be small.
They are mainly used in supplying excitation of small and medium range alternators. Calculate a the speed when the load current is 50a. Load test on dc shunt motor unicon instruments exporter. The present research work deals with the application of response surface methodology rsm for controlling as well as estimating the rotating speed of a dc shunt motor. Online speed control of the shuntconnected dc motor via a neurocontroller. Armature rheostat should be kept in the maximum resistance position at the time of starting and stopping the motor. Hence with e v iara, we derive the speed of the dc motor n want more electrical knowledge. This paper discusses the speed and torque control of a shunt dc motor through matlab simulink simulations.
Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Applications of dc machines in the present day world, the electrical energy is generated in bulk in the form of an alternating current. Therefore the voltage drops i a r a will be negligible as compared to the external supply voltage v. Arduino technology free circuits interview questions. 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. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. To study the behavior of a shunt dc motor speed when the armature voltage is altered. M1 is the main motor whose speed control is required. 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. May 25, 2015 thyristor speed control of separatelyexcited d. The electric drives are classified into dc drive and ac drive. A dc motor is any of a class of rotary electrical motors that converts direct current electrical. The speed control below the rated speed control is not possible using this type of control.
The shunt wound dc motor falls under the category of self excited dc motors, where the field windings are shunted to, or are connected in parallel to the armature winding of the motor, as its name is suggestive of. On occasion, a field regulator is contained within the field circuit of dc shunt motor for additional speed adjustment. The voltage applied to the motor may be reversed by backing the field current of generator through controller fc. Homework statement a 250v shunt dc motor runs at rpm while taking a current of 25 a. For a dc shunt motor field winding is connected in series with the armature and current passing through the series winding is same as the armature current therefore the series field winding has fewer. Dc shunt motor speed control armature control method.
Tarun agarwal is the chief customer support officer at edgefx technologies pvt ltd. Speed control of shunt dc motor johurul islam academia. Speed control methods of dc shunt motor my tech info. We can use this technique to control motor speed above its rated value. This variable voltage is supplied by a motor generator set which consists of either a dc or an ac motor m2. The dc petitive with dc motors in speed control applications. To study the behavior of a shunt dc motor speed when a series resistor is inserted in the armature circuit. In this session we will discuss the armature voltage control technique of the speed control of dc shunt motors. As you know that the construction of any type of dc motor is very similar to a dc generator. This research will be focused to judge the performance of dc shunt motor by the implementation of. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. As we know, speed of a motor is given by if f is kept constant and also if a is neglected, then, n.
To study the behavior of a shunt dc motor speed when a. In the case of a dc motor, the magnetic field is produced by the field winding. This intentional change of drive speed is known as speed control of a dc motor speed control of a dc motor is either done manually by the operator or by means of an automatic control device. A shuntwound motor is a dc motor in which the wound electromagnetic rotor field is in parallel not series with the armature. What are the methods for controlling the speed of a dc shunt. Field rheostat should be kept in the minimum resistance position at the time of starting and stopping the motor. Variations of speed with armature voltage control at constant field current. As we know, speed of a motor is given by if f is kept constant and also if a. Dec 04, 2016 homework statement a 250v shunt dc motor runs at rpm while taking a current of 25 a. Despite the load changes, shunt dc motor can maintain constant speed. In this post, we will discuss about various speed control methods of dc shunt motor.
As resistance increased, the value of the field current will reduce. 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. A shuntwound motor has decreasing torque as speed increases. Speed control of shunt motor flux control method it is seen that speed of the motor is inversely proportional to flux. Dc motor speed control can be achieved by varying flux, armature voltage. At present, variable voltage is achieved by scr controlled ac to dc converter unit is used to. Speed control methods of various dc motors are explained in the links given below. A shunt dc motor has good speed regulation even as the load varies.
A stab is shaped piece of metal that makes up a certain type of wound rotor. Load test on dc shunt motor to draw speed torque and horse power efficiency characteristics. New ratiotrol microprocessorbased ac and dc controllers bring operating intelligence to our highperformance speed reducers, gears, motors, bearings, shaft. Dec 29, 2015 because of their selfregulating speed capabilities, dc shunt motors are ideal for applications where precise speed control is required. For example, in a shunt motor, placing a resistance in series with the shunt field reduces. And the armature winding is connected to external supply voltage hence it. What are the best ways to control the speed of dc motor. 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. Swinburnes test and speed control of dc shunt motor. Speedcontrolofdcshuntmotor page 1 experiment no 9 aim. To control the speed of dc shunt motor using armature 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.
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. Variation of speed with variation of field current at constant voltage. The physical implications of the equations regarding device behaviour, and the need for speed control, are easily understood. To determine the efficiency of the given dc shunt motor by conducting load test. Often we want to control the speed of a dc motor on demand.
Speed control of dc shunt motor with field and armature rheostat control 79 2. You need to power the field and armature separately. Equivalent circuit parameters are armature resistance ra 110 ohms, field resistance rf 2. Mod01 lec32 lecture32speed control of dc shunt motors. 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. Speed control of dc shunt motor with comparative analysis. In a shunt motor, the field and armature windings are connected in parallel. Working principle of dc shunt motor your electrical guide. In this paper, various speed control techniques for a dc shunt motor namely.
By means of this method, the motor can be worked at any speed up to its maximum speed. Working principle of dc shunt motor, dc series motor and all other dc motors can be stated as follows. 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. Learners examine the operation of a dc shunt motor and its characteristics. Speed of a shunt dc motor can be easily controlled. Applications that meet these criteria and are suitable for dc shunt motors include machines tool such.
What are the methods for controlling the speed of a dc. Speed control of dc shunt motor your electrical guide. When a current carrying conductor is placed in a magnetic field, it experiences a force. And the armature winding is connected to external supply voltage hence it plays the role of current carrying conductor. Comparison of three types of motor 1 the speed regulation in shunt motor is better than series motor 2 the starting torque of a series motor is more than other motor 3 both shunt and compound motors have definite no load speed, however series motors have dangerously high speed at no load. Speed control of dc shunt motor with field and armature. 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. Power low in dc motor copper loss in armature, field and series windings. Dc shunt motor speed control and analysis using ziegler. He has 8 years of experience in customer support, operations and administration. Speed control of dc motor shunt, series and compound. These methods as applied to shunt, compound and series motors will be discussed below.
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. Types of dc motors dc motor are of 3 types they are 1. A brushed dc electric motor is an internally commutated electric motor designed to be run from a direct current power source. To study the speed control of the given dc shunt motor by field control method and. Tech student, department of electrical engineering mpct gwalior india 2assistant professor, department of electrical engineering mpct gwalior india. Apr 16, 2017 you need to power the field and armature separately. When motor current increases, the control will disconnect the resistor and low. 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. To find the various parameters such as torque, input power, output power etc. The original drive system studied in this paper consists of diode based ac to dc three phase rectifier, power mosfet chopper and dc shunt motor.
Armature voltage control is used to control the motor speed below the rated speed. Flux control method speed is inversely proportional to. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a dc motor. 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. P3 odd semester examination 2019 department of eee, university of rajshahi name of the instructor.
A good material for the poles of a pmdc motor should have the apposite of the above. Dec 11, 2017 in this session we will discuss the armature voltage control technique of the speed control of dc shunt motors. Experiment 6 shunt dc motor ii objective to study the behavior of a shunt dc motor speed when the field resistance is altered. And for this reason both the armature winding and the read more. To draw the open circuit characteristics curve of dc shunt generator and to. To control the speed of dc shunt motor using field control method. Since load is very small in a shunt motor, armature current is also very low. Modelling and simulation of dc drive university of technology, india, e. Speed control of dc shunt motor with comparative analysis with pi and fuzzy controller approach bhaskar roy1 and shilpi sisodiya2 1 m. To study the speed control of the given dc shunt motor by field control method and armature control method. 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. The dc shunt motor is 120vdc with rated speed of 1800. In general, the field gets constant voltage, and the armature gets variable voltage to control the speed.
View notes speedcontrolofdcshuntmotor from boston 6. Thyristor scr speed control of a dc shunt motor dspace repository thyristor scr speed control of a dc shunt motor. The speed of a shunt motor can be changed by flux control method. Voltage control can be via a mosfet pwm circuit, or for mains powered application, scrs. There is a limit to the maximum obtainable speed by this method due to poor commutation at week fluxes. Debaprasad kastha, department of electrical engineering, iit kharagpur. By applying a variable voltage across its armature, any desired speed can be obtained. Nature of operation characteristics of electric drive motors. Once the motor reaches its full speed, it remains constant. This item appears in the following collections higher diploma in electrical and electronics engineering 22 projects. Describe briefly the method of speed control available for dc motors. Speed control of dc shunt motor by armature and field control.
Electrical machinel dc laboratory manual grietelectrical and. The electrical braking provide pollution free atmosphere because of absence of dust, which is. 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. Dec 11, 2016 history of dc motor michael faraday u.