Why starters are required in a DC motor?

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Mr. Dubey

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📊 Electrical Drives and Controls (EDC)

Q. Why starters are required in a DC motor?

(A) back emf of these motors is zero initially
(B) these motors are not self-starting
(C) these motors have high starting torque
(D) to restrict armature current as there is no back emf at starting

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✅ Correct Answer: (D) to restrict armature current as there is no back emf at starting

Explanation: at the time of starting (n=0), the induced emf of a motor is zero such that current drawn by armature, from rated voltage supply would be ia= v/ra. since armature resistance is very low, armature current drawn is very high and will damage the machine.

Explanation by: Mr. Dubey

at the time of starting (n=0), the induced emf of a motor is zero such that current drawn by armature, from rated voltage supply would be ia= v/ra. since armature resistance is very low, armature current drawn is very high and will damage the machine.

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