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WHAT IS A SERVO-DRIVE?

The prefix servo comes from the Latin servus which means slave or servant. Technically translated tis means to follow or execute a command. A servo motor follows the (complex) task given to him.

For industrial applications, servo motors are used where a drive-system has to be accurate or highly dynamic. The feedback to the motor is done through a resolver (analogue sensor of rotation) or encoder (digital sensor of rotation). A servo motor is controlled by a servo amplifier, possibly with a shaft controller.

The rotation frequency of the actuator is given back by the resolver or encoder. This is capable in addition to the rotational speed, also to determine the position of the rotor and the direction of rotation. The servo amplifier compares the set rotational frequency with the measured rotational frequency. Now the servo amplifier can drive the actuator to the desired values.