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Maximum torque in a DC machine is limited by ______________

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Maximum torque in a DC machine is limited by ______________

(a) Commutation

(b) Heating

(c) Losses other than heating

(d) Stability

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The question is from Applications of DC Machines topic in section DC Machines of DC Machines

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Right choice is (a) Commutation

To explain: While for all other motors maximum torque is restricted to certain value as various losses in other motors lead to heating of the core materials. In DC machines for maximum torque commutation time will obviously decrease and beyond some point commutation process can’t be fastened.

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