Question

Draw the voltage that can apply on one phase for switching reluctance motor if (a) single...

Draw the voltage that can apply on one phase for switching reluctance motor if (a) single pulse is used,(b) soft chopping is used, and (c) hard chopping is used? ********************** ************** (B) Compare between the conventional DC motor and PMDC motor with respect to the following factors:(1) the efficiency of the motor (why), (2) the size of the motor (why), and (3) the cost of the motor (why)?
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Answer #1

(a). Single Pulse Representation. (b). Soft Chopping. (c). Hard Chopping

(B). Advantages of PMDC motor over Conventional DC Motor:

  1. As the stator of PMDC motor is made up of the permanent magnet, instead of electromagnets in a conventional DC Motor. So, the PMDC does not require field windings of copper that generally introduces unnecessary copper loss. So, the overall efficiency of the PMDC motor is better than that of the conventional DC motor.
  2. PMDC does not require the excess spacing for stator winding and core. So the size of PMDC is less than that of a conventional DC motor.
  3. For all reasons above, no use of the copper windings and a separate field excitation in the stator makes PMDC motor cost-efficient.
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