A gearmotor, such as the one illustrated, consists of a motor and speed reducer in an integral assembly. The motor portion of the assembly can be either DC or AC powered. The speed reducer portion can use spur, helical, or worm gears. Gearmotor sizes range from fractional to above 200 hp.


Typical Gearmotor in Right Angle Configuration

The main advantage of a gearmotor is that the driving shaft can couple directly to the driven shaft, thus in many situations making belts, chains, or separate speed reducers unnecessary. Also, because the motor and speed reducer are aligned during manufacture, field installation is simpler.


Various Gearmotors

Starting and running torque must be considered separately because starting characteristics of the motor and gearing differ. Applications needing high breakaway torque require careful selection of the motor-splitphase polyphase, capacitor-start, and brush types have high starting torque.

The gearmotor manufacturer should analyze any application with high inertia. This problem is especially important with self-locking right-angle gear motors because the rotor and load are rigidly connected by the gear train, both must stop in the same time. In severe cases, momentary power failure may be all that is necessary for a high-inertia load to destroy the gear train.

Overhung loads are applied to the output shaft of the gearmotor whenever the gear motor is connected to the application by belts, chains, or gearing. Applications requiring cams, hoisting drums, or switches at the output shaft can also cause very high overhung loads on gearhead bearings.

It is inherent in gearmotors that overhung load capacity decreases as delivered torque increases.


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

Sinotech gearmotors are engineered in the U.S. and manufactured in China, Taiwan and Korea.

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