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For the development of electromagnetic torque in a rotating electrical machine, the number of rotor poles must be ____________

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For the development of electromagnetic torque in a rotating electrical machine, the number of rotor poles must be ____________

(a) greater than the stator poles

(b) less than the stator poles

(c) equal to the stator poles

(d) either greater or lesser than the stator poles

This question was addressed to me in an online quiz.

My question is from Torque Production and Dynamic Equations in portion Basic Concepts in Rotating Machines of Electrical Machines

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Correct option is (c) equal to the stator poles

The explanation: If the rotor poles are not equal to the stator poles, the net electromagnetic torque will be zero as the force of attraction will be cancelled by the force of repulsion.

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