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The cogging torque is absent in the permanent magnet dc machine is due to ________

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The cogging torque is absent in the permanent magnet dc machine is due to ________

(a) non-magnetic nature of rotor

(b) magnetic nature of rotor

(c) absence of ac supply

(d) any of the mentioned

I have been asked this question in an online quiz.

The above asked question is from Torque in DC Machines topic in portion Electromechanical Energy Conversions of Electrical Machines

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Right choice is (a) non-magnetic nature of rotor

Easy explanation: It is due to the fact that no field poles are induced in PMDC to create magnetic flux leading to harmonics.

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