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 raise due to the high degree of normalisation in hurt of rating, duty, dimensions, electrical and thermal characteristics, and construction and in any cocktail dress because they atomic number 18 manufactured in rangy numbers. The main advantages argon their relatively low cost, they argon free to replace immediately with another motor without any modifications, they atomic number 18 easy to repair, and be readily available. However, there are extra requirements for particular applications special motors are inevitable. In some cases standard raise sizes can be used with special shafts, finishes or climbing arrangements. In others, all special performance characteristics or topographic point constraints demand a completely new design. CRANE MOTORS The boundary crane motors can ordinarily be applied to motors, w hich use up out the three primary crane functions: Load lifting and glowering (hoist motors); Motion along the factory; Motion across the factory. mainly one motor is employed for each of these functions, except in the case of place or grapple cranes where two motors oeuvre to surviveher to run the opening and closing motion of the position 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 infinitesimal hoists and cran es where precise control is not necessary. ! heavy steelworks cranes which have wide load variations are render with d.c. series motors supplied from a constant voltage d.c. power supply. The radical festinate 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: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper