A 12 V DC motor has an armature resistance of 10 Q and according to its specification sheet, it generates a counter electromotive force (CEMF) at the rate of 0.3 V/100 rpm. (a) Evaluate the actual armature current at a rotational speed of: (i) O rpm (ii) 1000 rpm (b) Determine the rotational speed when the current is equal to zero

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.