Electrical Engineering ⇒ Topic : Necessity of a Starter for Starting DC Motors
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Sonali
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Need for Starters:- A motor at rest has no back or counter e.m.f. At staring therefore, the armature current is limited only by the resistance of the armature circuit. The armature resistance is very low, however, and if full voltage were impressed upon the motor terminals at stand still, the resulting armature current would be many times full-load value usually sufficient to damage the machine. For this reason, additional resistance is introduced into the armature circuit at starting. As the motor gains speed, its back e.m.f. builds up and the starting resistance is cut out. | |
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