14.a. An encoder is a device that is used to A. excite the motor's interpoles. B. feed pack position information. C. reduce brush sparking. D. commutate the field windings. 14.b. The letters CEMF are used to describe A. centrifugal forces within a motor. B. the portion of the supplied current that is converted to heat. C. countervoltages and currents created within a motor. D. critical winding currents that should not be exceeded.

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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.