Speed Control of DC Shunt Motor There are three method which are famous for motor speed control i.e. The principal advantage of a dc motor is that its speed can be changed over a wide range by a variety of simple methods. 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So, we can see that Speed of the motor mainly depends upon the supply voltage, armature resistance and field flux. If we vary If, flux φ will change, hence speed will vary. We will discuss Field Weakening Method of speed control of DC Motor for DC Shunt Motor and DC Series Method separately. An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed. Flux Control Method : It is seen from the above equation that N α 1 / φ. Shunt motor is the most common type of DC motor where we connect the field winding parallel with the armature windings. but . Required fields are marked *, Speed control of a DC shunt Motor by Field Control Method – Electrical Practical. By doing this, we can reduce the voltage across the armature. Added in series with the field c. Connected across armature d. Both in series with armature and field View Answer / Hide Answer DC Shunt Motor Speed Control Methods. What is DC Shunt Motor?Speed Control of DC Shunt Motor. A DC shunt motor (also known as a shunt wound DC motor) is a type of self-excited DC motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor. Added in series with the armature b. This speed control method is also known as Ward Leonard Method, which is discussed in detail under the topic Ward Leonard Method or Armature Voltage Control. In practice, variation of any these factors can be used for speed control of DC motor. Armature control method Speed of a dc motor is directly proportional to the back emf E b and E b = V - I a R a. Thanks for viewing our post, hope you liked it and if you think we are helping you then spread the word. By series resistance in parallel with the field winding of the motor. The armature of the shunt motor M (whose speed is to be controlled) is connected directly to a d.c. generator G driven by a constant-speed a.c. motor A. Q6. (5.1). In armature voltage control method or rheostatic control method for speed control in d.c. shunt motor, a variable resistance is a. 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. Field flux control 3. Field Current Control. Multiple Voltage Control: In this method, the shunt field is connected to a fixed exciting voltage, and the armature is supplied with different voltages. 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. This method of speed control is independent of load on the motor. Multiple voltage control. Field Weakening Method for Speed Control of DC Shunt Motor: Theory: Fundamental Relationship: A DC shunt motor (also known as a shunt wound DC motor) is a type of self-excited DC motor where the field windings are shunted to or are connected in parallel to the armature winding of the motor. Speed Control of D.C. Motors. 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. In this post, we will discuss about various speed control methods of dc shunt motor. Field Control Method for DC Shunt Motor. An electric motor is an electrical machine that converts electrical energy into mechanical energy. This adjustable resistance is also known as shunt field rheostat. Your email address will not be published. In Ward Leonard method of speed control, we change the input voltage of a DC motor. Shunt DC Motors operate on direct current. 79. Therefore the voltage drops I a R a will be negligible as compared to the external supply voltage V. . Speed control is obtained as follows: For series motors. These parts are connected either in series or parallel according to the requirement of the speed of the motor. speed control of dc shunt motor pdf. In armature voltage control method or rheostatic control method for speed control in d.c. shunt motor, a variable resistance is a. The stronger the shunt field, the lower the RPM. Due to series parallel connections, the total MMF produced by field winding will change. Since they are connected in parallel, the armature and field windings are exposed to the same supply voltage. So, by considering the copper loss of the series field, we can write. DC Shunt Motor Speed Control Methods. Armature control Method. 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