Closed-Loop Servo Drives

Closed-loop servo drives are electronic units that provide power and control to a servo motor. The word “servo” implies a closed-loop system, where a position sensor (normally an encoder) provides continuous feedback of position data which the drive uses to modify its outputs to the motor to maintain the desired speed and position. Servo drives can be programmable for stand-alone operation or can receive commands from an external source such as a PLC or CNC controller. These commands can be in the form of an analogue voltage or as data sent over a fieldbus.

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