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For some percentage increase in the torque, which DC motor will have the least percentage increase of input current?

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For some percentage increase in the torque, which DC motor will have the least percentage increase of input current?

(a) Series motor

(b) Shunt motor

(c) Cumulative compound motor

(d) Separately exited motor

The question was posed to me during an interview for a job.

My question is based upon Operating Characteristics of DC Shunt Motor topic in division Characteristics of DC Motors of DC Machines

1 Answer

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Best answer
Correct answer is (a) Series motor

The best I can explain: The mechanical torque T is directly proportional to the product of flux per pole φ and armature current. In case of DC series motor, up to saturation point flux is proportional to field current because Ia = If. Now if small percentage increase in armature current (before saturation) will occur the same percentage of torque will increase. Whereas in DC series motor the torque is proportional to square of the armature current (before saturation).

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