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Which DC motor is more preferred for elevators?

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Which DC motor is more preferred for elevators?

(a) Shunt motor

(b) Series motor

(c) Differential compound motor

(d) Cumulative compound motor

The question was posed to me during an online exam.

This key question is from Operating Characteristics of DC Compound Motor topic in chapter Characteristics of DC Motors of DC Machines

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Best answer
The correct choice is (d) Cumulative compound motor

Explanation: Cumulative wound DC motors give high starting torque like a series motor and reasonable good speed regulation at high speeds like a shunt dc motor. As this type of motor offers the best of both series and shunt motor, it is practically suitable for most common applications like elevators.

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