Geared DC Motor with Gear Motor Reducer

A geared DC motor is basically an extension of a normal DC motor. It can produce high torque even when the horsepower is low and the speed and torque are inversely proportional to each other. This means that it can be used when a very heavy load is to be moved or lifted with a high amount of force. Such motors are have two different speeds, one of which is their stall speed and the other which is the normal speed.

Principle of operation

The basic principle of operation of a geared DC motor is based on an electrical motor with a gear motor reducer attached to the motor. This gear assembly which is fixed to the motor shaft is responsible for increasing the torque when the speed is reduced. Using a combination of gears in the gear motor, literally any speed can be attained. What happens is that there is a gear box or a series of gears attached to the main motor rotor shaft. This is done via a secondary reduction shaft. A series of reduction gears is created by connecting the gearbox to the secondary shaft. The use of a geared DC motor is in applications where speed needs to be reduced so that a higher torque will be generated. This is done using the series of gears. When the length of the gear motor reducer is long, the output will be obviously low at the final gear. Rotations per minute or RPM is the unit used to measure the speed of the motor.


Gear motors which can be bought from Teco Electric Co. Ltd. is normally used in devices like clocks, door openers for garages, can openers and washing machine time control knobs. They are commercially used in commercial jacks, hospital beds, lift jacks and cranes.