U. S. Naval Personnel, The Editors of REA, Engineering Study's Basic Training for Electrical Motors PDF

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

The fabric during this e-book was once ready for electric education classes. it's a useful guide that permits even the newbie to know a number of the themes speedy and punctiliously. The booklet is exceptional in that it teaches the innovations of simple electrical energy in a fashion that is transparent, to-the-point, and extremely effortless to appreciate. It varieties a superb origin should you desire to continue from the fundamentals to extra complex subject matters. quite a few illustrations are incorporated to simplify studying either theories and their purposes. Direct-current and alternating-current units and circuits are defined intimately. Magnetism, in addition to automobiles and turbines are defined to offer the reader a via knowing of them. The ebook is a superb source for the layperson in addition to approved electricians.

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Moisture or high humidity is another concern. A key instance of this is a food processing environment requiring washdowns. In such cases, consider reducers with special epoxy coatings, external shaft seals, and stainless steel shaft extensions and hardware. If a gearmotor is used, be sure the motor has similar washdown-duty features. -53- Leeson Basic body pages v3 1/31/02 11:37 AM Page 54 Gear Reducer Maintenance Industrial gear reducers require very little maintenance, especially if they have been factory-filled with quality, synthetic lubricant to a level sufficient for all mounting positions.

Helical gears, which have teeth cut in helixes to maximize gear-to-gear contact, offer higher efficiencies and quieter operation – though at a correspondingly higher cost than straight-tooth spur gears. Single-reduction speed ratios are far more limited in parallel-shaft reducers than in right-angle worm reducers, but multiple reductions (or gear stages) fit easily within a single parallel-shaft reducer housing. As a result, the availability of higher ratios is usually greater in parallel-shaft reducers and gearmotors; ratios as high as 900:1 are common in small gearmotors.

This straightforward mounting approach is common with motors ranging in sizes from fractional through 20 HP and larger. An electric motor combined with a gear reducer creates a gearmotor. In sub-fractional horsepower sizes, integral gearmotors are the rule – meaning the motor and the reducer share a common shaft and cannot be separated. 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.

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Basic Training for Electrical Motors by U. S. Naval Personnel, The Editors of REA, Engineering Study Guides


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