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Why is the starting current high in a DC motor?

March 21, 2018 by

DWQA Questions › Category: DC Motor & Generator › Why is the starting current high in a DC motor?
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admin Staff asked 5 years ago
1 Answers
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admin Staff answered 5 years ago

Answer: In DC motors, Voltage equation is V=Eb – IaRa (V = Terminal voltage,Eb = Back emf in Motor,Ia = Armature current,Ra = Aramture resistance).At starting, Eb is zero. Therefore, V=IaRa, Ia = V/Ra ,where Ra is very less like 0.01ohm.i.e, Ia will become enormously increased. In simple words we can say at starting there is no back emf, that is why the current is high.

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