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Torque of the cumulative compound DC motor is _____________

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Torque of the cumulative compound DC motor is _____________

(a) Addition of Ia and Ia^2 term

(b) Subtraction of Ia from Ia^2 term

(c) Subtraction of Ia^2 from Ia term

(d) Addition of -Ia and -Ia^2 term

I had been asked this question in final exam.

My question is taken from Operating Characteristics of DC Compound Motor in section Characteristics of DC Motors of DC Machines

1 Answer

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Correct choice is (a) Addition of Ia and Ia^2 term

Best explanation: DC cumulative compound motor is the addition of best of series and best of shunt field motor. For shunt type torque is proportional to armature current while in series motor torque is proportional to square of armature current.

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