New PDF release: Basic Training for Electrical Motors

By U. S. Naval Personnel, The Editors of REA, Engineering Study Guides

The fabric during this publication used to be ready for electric education classes. it's a useful guide that allows even the newbie to know some of the themes speedy and carefully. The booklet is different in that it teaches the techniques of uncomplicated electrical energy in a manner that is transparent, to-the-point, and extremely effortless to appreciate. It types a good origin should you desire to continue from the fundamentals to extra complex subject matters. quite a few illustrations are integrated to simplify studying either theories and their purposes. Direct-current and alternating-current units and circuits are defined intimately. Magnetism, in addition to cars and turbines are defined to provide the reader a via knowing of them. The e-book is a superb source for the layperson in addition to authorized electricians.

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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.

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