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Extra resources for Basic Training for Electrical Motors
Single-reduction worm gear reducers are commonly available in ratios from approximately 5:1 through 60:1. A 5:1 ratio means that motor input of 1750 RPM is converted to 350 RPM output. A 60:1 ratio brings output RPM of the same motor to 29 RPM. Greater speed reductions can be achieved through double-reduction – meaning two gear reducers coupled together. The flip side of “geared-down” speed is “geared-up” torque. For the majority of gear reducers in North America, output torque is expressed in inch-pounds or foot-pounds.
For application flexibility and maintenance reasons, a larger gearmotor is usually made up of an individual reducer and motor coupled together. This is most often accomplished by using a reducer having a NEMA C input flange mated to a NEMA C face motor. LEESON uses the term Gear+Motor™ for its separable reducer and motor packages. At left, a quill-style input worm gear reducer uses a hollow unput shaft and a shallow mounting flange. At right, extended mounting flange accommodates a solid-shaft to solid-shaft input with a flexible coupling joining the two shafts.
A 60:1 ratio brings output RPM of the same motor to 29 RPM. Greater speed reductions can be achieved through double-reduction – meaning two gear reducers coupled together. The flip side of “geared-down” speed is “geared-up” torque. For the majority of gear reducers in North America, output torque is expressed in inch-pounds or foot-pounds. Outside of North America, the metric unit of torque, newton-meter, is most common. Output speed and output torque are the key application criteria for a gear reducer.