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Difference between revisions of "Gear Motors"
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[[File:Gear motor.jpg|thumb|right|20mm gear motor]] | |||
'''Gear Motor''' is a commonly used term that designates a hoist that derives its lifting and lowering power from a mechanical setup involving a gear set and pneumatic or electric motor.As the name implies, a gear motor or geared motor is a motor having an attached gear assembly. The gear assembly or gear train enable the gear motor to provide greater torque at a lower RPM than the motor alone would be capable of providing. | |||
That is,gear motor refers to a combination of a motor plus a reduction gear train. These are often conveniently packaged together in one unit. The gear reduction or gear train reduces the speed of the motor, with a corresponding increase in torque. Gear ratios range from just a few to huge. A small ratio can be accomplished with a single gear pair, while a large ratio requires a series of gear reduction steps and thus more gears. There are a lot of different kinds of gear reduction. | |||
In the case of a small transmission ratio N, the unit may be back drivable, meaning you can turn the output shaft, perhaps by hand, at angular velocity w and cause the motor to rotate at angular velocity Nw. A larger transmission ratio N may make the unit non-back drivable. Each has advantages for different circumstances. Back drivability depends not just on N, but on many other factors. | |||
For large N, often the maximum output torque is limited by the strength of the final gears, rather than by N times the motor's torque. | |||