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Why is back EMF used for a DC motor? Highlight its significance.

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Question added by Umar Draz , IT NETWORK SUPPORT ENGINEER , SYSTRONIC IT SERVICES
Date Posted: 2016/04/17
Hazrat Ali
by Hazrat Ali , PLANNING ENGINEER , BCES

When the armature of a d.c. motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence e.m.f. is induced in them as in a generator. The induced e.m.f. acts in opposite direction to the applied voltage V (Lenz's law) and in known as back or counter e.m.f.

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