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excellent study note on D.C Motors by IIT professor

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excellent study note on D.C Motors by IIT professor

Postby subham » Fri Oct 19, 2012 3:01 pm

hi friend Download excellent study note on D.C Motors by IIT professor on following tropic

Goals of the lesson

In this lesson aspects of starting and speed control of d.c motors are discussed and explained. At the end principles of electric braking of d.c. shunt motor is discussed. After going through the lesson, the reader is expected to have clear ideas of the following.

1. The problems of starting d.c motors with full rated voltage.

2. Use and selection of variable resistance as a simple starter in the armature circuit of a d.c motor.

3. Superiority of commercial starter (3-point starter) over resistance starter. Various protective features incorporated in a commercial starter.

4. Various strategies (namely-armature resistance control, armature voltage control and field current control) adopted for controlling speed of d.c motors.

5. Importance of characteristics such as (i) speed vs. armature current and (ii) speed vs. torque which are relevant for clear understanding of speed control technique.

6. Principle of electric braking – qualitative explanation.
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