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It is impossible to start a differential compounded dc motor.

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It is impossible to start a differential compounded dc motor.

(a) True

(b) False

The question was asked in an interview.

I'm obligated to ask this question of Operating Characteristics of DC Motors topic in chapter DC Motors of Electrical Machines

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The correct answer is (a) True

The explanation is: It is so because of the unstable speed and torque characteristics. At starting, armature current and series field current are high. Since the series flux subtracts from shunt flux, series flux actually reverses the magnetic polarity. This motor will typically be still or turn slowly in wrong direction while burning up because of excessive current.

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