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In which of the following method, effect of armature reaction is more?

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In which of the following method, effect of armature reaction is more?

(a) Field weakening method

(b) Armature resistance control

(c) Same in both methods

(d) Cannot be determined

The question was posed to me in a job interview.

The origin of the question is Speed Control Using Field Control of Shunt Motor in division DC Motors of DC Machines

1 Answer

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Best answer
Correct answer is (a) Field weakening method

Best explanation: In field weakening method we are reducing the working flux to increase the speed, by reducing the field current. Therefore, effect of armature flux on main field flux will increase in case of field weakening method.

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