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Servo Drive Amplifier

Drive Amplifier courtesy QuickSilver Controls

A drive or amplifier to transform the control signal from the motion controller into a higher power electric current or voltage that is presented to the actuator. Newer "intelligent" drives can close the position and velocity loops internally, resulting in much more accurate control.


A servo drive receives a command signal from a control system, amplifies the signal, and transmits electric current to a servo motor in order to produce motion proportional to the command signal. Typically the command signal represents a desired velocity, but can also represent a desired torque or position. A sensor attached to the servo motor reports the motor's actual status back to the servo drive. The servo drive then compares the actual motor status with the commanded motor status. It then alters the voltage frequency or pulse width to the motor so as to correct for any deviation from the commanded status.

In a properly configured control system, the servo motor rotates at a velocity that very closely approximates the velocity signal being received by the servo drive from the control system. Several parameters, such as stiffness (also known as proportional gain), damping (also known as derivative gain), and feedback gain, can be adjusted to achieve this desired performance. The process of adjusting these parameters is called performance tuning.

Although many servo motors require a drive specific to that particular motor brand or model, many drives are now available that are compatible with a wide variety of motors.


Servo systems can be used in:

CNC machining

Factory automation




Some of our Drive Amplifier Sponsors include...

AMK Automation Corp

Uniquely flexible and fully customizable - that's the essence of the AMK Automation portfolio


DINGS' is a manufacturer of stepper motor driven linear actuators and has production facilities in Changzhou, China and Morgan Hill, California, USA

Electromate Inc.

Distributor of AC & DC Servo and Stepper Motors, Drives, Controls, Positioning Systems & Robots, extensive product selection and JIT inventory

JVL Industri Elektronik A/S

JVL Industri Elektronik A/S is a leading company in the production and development of integrated AC servo and stepper motors.

PI (Physik Instrumente) L.P.

Physik Instrumente (PI) designs and manufactures precision motion control equipment, piezo motors, air bearing stages and hexapod parallel-kinematics.

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