Many applications exist where something has to be controlled to follow a reference quantity. For example, the speed of a large motor may be set from a low-power control signal. This can be achieved using a variable-speed drive. Ideally, the relationship between the reference and the motor speed should be linear, and the speed should change instantly with changes in the reference. Any control system, with an input reference signal, a transfer function F and an output. For the system to be ideal, the transfer function F would be a simple constant, so that the output would be proportional to the reference with no delay.

Inspec keywords: torque control; electric motors; position control; variable speed drives; velocity control

Other keywords: position control; speed control; motor speed; transfer function; low-power control signal; variable-speed drive; torque control; control system

Subjects: Drives