Electrical motors essay, including: Crane motors, Lift motors, Double-cage induction motors, etc.

INTRODUCTION Standard general-purpose beat backs generate some(prenominal) advantages of importance to the user of electric car motor drives. These swot due to the high degree of normalisation in wrong of rating, duty, dimensions, electrical and thermal characteristics, and construction and in any expression because they atomic number 18 manufactured in oversized numbers. The main advantages argon their relatively low cost, they argon lite to replace immediately with another motor without any modifications, they be easy to repair, and atomic number 18 readily available. However, there are particular(a) requirements for particular applications special motors are inevitable. In some cases standard vomit sizes can be used with special shafts, finishes or climb arrangements. In others, all special performance characteristics or quadriceps femoris constraints demand a completely new design. CRANE MOTORS The confines genus Grus motors can ordinarily be applied to motors, which book out the three primary crane functions: Load lifting and large(p) (hoist motors); Motion along the factory; Motion across the factory. generally one motor is employed for each of these functions, except in the case of place or grapple cranes where two motors bestow to demoralizeher to run the opening and closing motion of the lay and grapple and the hoisting motion. Because of the very(prenominal) hold up requirements (variable torque loads, acceleration, stopping and reversal) crane motors are all d.c. or a.c.

wound-motor induction motors, although cage motors are used for infinitesima l hoists and cranes where precise control is! not necessary. heavy steelworks cranes which have wide load variations are fit out with d.c. series motors supplied from a constant voltage d.c. power supply. The primary travel rapidly control is inherent in the motor speed regulation. Series-connected tapped resistance banks are switched to provide current limiting on starting and low-speed operation. In cases where charming speed control is essential, Ward-Leonard or thyristor controlled d.c. motor drives are usually the first choice. Wound-rotor a.c. If you want to get a full essay, army it on our website: BestEssayCheap.com

If you want to get a full essay, visit our page: cheap essay