When field voltage is controlled to provide a method of variable speed control, the system is using a concept known as field A. drive. B. weakening. C. stability. D. bias.

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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.