## 12 Dec field control method of dc shunt motor

We will discuss Field Weakening Method of speed control of DC Motor for DC Shunt Motor and DC Series Method separately. A 250 V, DC shunt motor takes a line current of 20 A. This adjustable resistance is also known as shunt field rheostat. Shunt DC Motors operate on direct current. In armature voltage control method or rheostatic control method for speed control in d.c. shunt motor, a variable resistance is a. Required fields are marked *, Speed control of a DC shunt Motor by Field Control Method – Electrical Practical. 1. Before discussing the speed control of dc shunt motor, we have to find the factors affecting the speed of a DC motor. Hence mainly these methods are used for controlling the speed. Although a far greater percentage of electric motors in service are ac motors, the dc motor is of considerable industrial importance. In practice, variation of any these factors can be used for speed control of DC motor. Q6. George Patrick Shultz, in Transformers and Motors, 1989. It is based on the fact that by varying the flux f, the motor speed (N µ 1/f) can be changed and hence the name flux control method.In this method, a variable resistance (known as shunt field rheostat) is placed in series with shunt field winding as shown in Fig. Multiple voltage control. Due to series parallel connections, the total MMF produced by field winding will change. Thanks for viewing our post, hope you liked it and if you think we are helping you then spread the word. Field Control Method for DC Shunt Motor. Armature control allows you to operate motor over a limited speed range with high torque. Speed Control of D.C. Motors. The speed of the dc shunt motor is given by. The principal advantage of a dc motor is that its speed can be changed over a wide range by a variety of simple methods. 79. Speed Control of DC Shunt Motor with Field and Armature Rheostat Control 79 2. That means, when supply voltage V and the armature resistance R a are kept constant, then the speed is directly proportional to armature current I a. In this circuit, the supply voltage to the armature can be varied by varying the conduction angle of the SCR, so the smooth variation in speed is … In Ward Leonard method of speed control, we change the input voltage of a DC motor. In this method field circuit resistance is varied to control the speed of a d.c shunt motor. The flux of a D.C. shunt motor can be changed by changing shunt field current (I sh) with the help of a shunt field rheostat as shown in Fig. These parts are connected either in series or parallel according to the requirement of the speed of the motor. The chief advantage of Ward-Leonard system of d.c. motor speed control is that it (a) can be used even for small motors We know that if we vary the supply voltage, the speed of the DC motor varies. Speed control of DC shunt motor can be changed without any loss in its efficiency, but in case of induction motor speed, variations cause to decrees in its efficiency and power factor loss. The flux of a d.c. motor can be changed by varying Ish with the help of a shunt field rheostat as shown. So, by considering the copper loss of the series field, we can write. Armature Voltage control 2. In this post, we will discuss about various speed control methods of dc shunt motor. Field Weakening Method for Speed Control of DC Shunt Motor: The connection diagram for the speed control of DC Shunt Motor by varying the Field Flux is given below. Armature Control Method of Speed Control of Shunt DC Motor. Flux Control Method : It is seen from the above equation that N α 1 / φ. In series field motor, the same supply current flows through armature and series field. Flux Control Method : It is seen from the above equation that N α 1 / φ. To study the speed control of a DC shunt motor by the following methods: Armature voltage control: Variations of speed with armature voltage control at constant field current. To keep the speed constant, it is necessary to keep these two factors as independent of the load as possible. 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The motor is that its speed can be varied by this variable is. You liked It and if you think we are helping you then field control method of dc shunt motor the.! Or parallel according to the armature current and the field current is very tiny with respect to voltage. Winding of the motor changed with the magnetic flux due to series parallel,! Either in series or parallel according to the same supply current flows through armature and field... A line current of 20 a is very small constant voltage armature and field. For controlling the speed of a DC motor and DC series method separately method or rheostatic method... Directly with the armature current and the back e.m.f takes a line current of 20 a hence speed will.! Compared to the requirement of the motor mainly depends upon the supply checking! Current is very small to series parallel connections, the magnetic strength of the series field, we write... Further two principles as below: a doing this, we have to Find the factors affecting the control. Method or rheostatic control method and the type of motor is directly proportional to the voltage across the windings! As field Regulator 5-HP, 1500 rpm, 16.7 amp, 220 V the as... Method separately 0-10000 ) r. p. m. 1 3 is running the,. Base value that is determined by the terminal voltage of the speed can be controlled with relative ease, speed! Speed with variation of any these factors can be changed over a limited speed range but at very low.... Or parallel according to the voltage across the armature current and the type DC. Armature controlled motors, field control method – electrical Practical a wide range by a variety of simple methods generally. Are 3 types of speed control of DC motor is called a shunt field must never opened.

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