Servo drive

A servo drive monitors the feedback signal from the servomechanism and continually adjusts for deviation from expected behavior.

It then alters the voltage, frequency or pulse width to the motor so as to correct for any deviation from the commanded status.

In cases where mechanisms must adapt to many conditions, this can be convenient because a digital drive can adjust quickly with little effort.

Often adjusted with potentiometers, analog drives have plug in “personality cards” which are preadjusted to specific conditions.

Most analog drives work by using a tach generator to measure incoming signals and produce a resulting torque demand.

This amplifier is referred as a four-quadrant drive because can accelerate, decelerate and brake in either rotating direction.

Servos, in constant speed changing use, have a better life cycle than typical AC wound motors.