Answered: Q3: What are the main differences…

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter33: Single-phase Motors

Section: Chapter Questions

Problem 17RQ

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Question

Q3: What are the main differences between the following solid rotor, high speed synch operation

three types of motors? Stepper, variable reluctance;

permanent magnet and hysteresis motors.

Expert Solution

Step 1

Permanent magnet motor:

The operation of DC machine is based on a magnetic field. The magnetic field can be created using an electromagnet or a permanent magnet . In PMDC the magnetic field is created by using permanent magnet.
As it is a permanent magnet, the field produced by it is constant. Hence it cannot be used where variable speed operation is required.
the stator is made up of steel and magnets are mounted from inside. In this way, steel provides a low reluctance path to the magnetic field.
commutator is present.
It is having high efficiency as no field excitation.
It comes in compact size as no field winding is present.
very cheap and economical.
Its application is a toy car, car wipers, computer disk, air conditioner, etc.

Step 2

Hysteresis motor:

The operation of a hysteresis motor is based on hysteresis loss happening in the rotor of steel material with high retentivity.
The rotor is of ferromagnetic material i.e magnetic material having hysteresis loss property. And is having very high resistance to eliminate eddy current losses.
It does not have teeth, winding in the rotor hence less vibration while running.
It is having less output when compared with IM of the same dimension
It has less power factor thus low efficiency.
Applications: sound equipment, timer devices, clocks etc.

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