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Friday, January 9, 2015

Why field rheostat is kept in minimum position while armature rheostat is at maximum position ?

Why field rheostat is kept in minimum position while armature rheostat is at maximum position ?

At the time of starting of motor, the armature resistance is kept at maximum position to control and reduce the high starting current and field rheostat at minimum position to ensure that speed does not go beyond rated value and to have high starting torque.

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