These AC servo motors are basically two-phase, reversible, induction motors modified for servo operation. AC servo motors are used in applications requiring rapid and accurate response characteristics. To achieve these characteristics, these AC servo motors have small diameter, high resistance rotors. The AC servo motor’s small diameter provides low inertia for fast starts, stops, and reversals. High resistance provides nearly linear speed-torque characteristics for accurate servo motor control.

An induction motor designed for servo use is wound with two phases physically at right angles or in space quadrature. A fixed or reference winding is excited by a fixed voltage source, while the control winding is excited by an adjustable or variable control voltage, usually from a servoamplifier. The AC servo motor winding is often designed with the same voltage/turns ratio, so that power inputs at maximum fixed phase excitation, and at maximum control phase signal, are in balance.

The inherent damping of AC servo motors decreases as ratings increase, and the AC servo motors are designed to have a reasonable efficiency at the sacrifice of speed-torque linearity.

Induction type AC servo motors are available in fractional and integral horsepower sizes.


Sinotech can ensure excellent AC Servo Motors from China, Taiwan and Korea and is very price competitive. Sinotech Motors has manufactured QS-9000 and ISO certified AC Servo Motors in China, Taiwan and Korea for over 15 years. Sinotech Motors is dedicated to delivering AC servo motors from China, Taiwan and Korea to you at lower prices but the same quality, service and terms as a domestic supplier.

Sinotech AC Servo Motors are engineered in the U.S. and manufactured in China, Taiwan and Korea.

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