Question

What are the desirable characteristics of the permanent magnets in PMDC machines?

Answer 1

Explanation:

Advantages

• For smaller ratings, use of permanent magnets reduces manufacturing cost.
• No need of field excitation winding, hence construction is simpler.
• No need of electrical supply for field excitation, hence PMDC motor is relatively more efficient.
• Relatively smaller in size.
• Cheap in cost.