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Alternating Current And Its Role in Electricity

Jun 19, 2008
AC motor is an electric motor that is driven by an alternating current. It consists of two basic parts, an outside stationary stator having coils supplied with AC current to produce a rotating magnetic field, and an inside rotor attached to the output shaft that is given a torque by the rotating field. AC motors require only three power conductors; DC motors require four.

However, most AC drive suppliers recommend special shielded power cables to minimize electrical interference from the AC drive. AC motors are also fairly simple to understand. They are a little trickier to make but will need single-phase or three-phase AC power to make them work.

AC motors are made either way. AC motor generators are quite common and versatile. By incorporating a hand-cranked generator, a generator can function as a motor and vice versa. AC motors typically feature rotors, which consist of a laminated, cylindrical iron core with slots for receiving the conductors. The most common type of rotor has cast-aluminum conductors and short-circuiting end rings.

AC motors are further subdivided into single phase and three phase motors. Single phase AC electrical supply is what is typically supplied in a home.

Inductors, like the coils in a motor, dislike having the current through them changed abruptly, and produce large voltage spikes. These can fry the triac in the dimmer. Inductive motors require a variable frequency control.

Induction machines develop starting torque at zero speed and can operate as standalone machines. Synchronous machines must have auxiliary means for startup, such as a starting induction squirrel-cage winding or an electronic controller.

AC motor (10) is mounted to a frame or a sub-frame (not shown) of the treadmill through use of a motor mount (13) as set forth in more detail below. Applicant's AC motor features an off-side flywheel (14) mounted to an off-side auxiliary output shaft (20), these two elements are located opposite drive side output shaft (18). AC motors may be classed as low, medium and high voltage.

Medium-voltage motors consume voltages from about 400V up to about 15 kV and generate power levels up to about 20,000 Hp. AC motor supplied by Chinese manufacturers with the most competitive prices and superb quality. Listings will lead you right to crucial data such as company brief introduction business type, main products, target market, contact information, certifications and more.

Electric Motor selection is also based on mission goals, power available, and cost. Electra Form has supplied 40 all-electric PET reheat stretch-blow machines here since they were introduced in 1995. But in Japan, electric blow molding machines already account for 80% of sales, reports Norifumi Sahara, general manager of sales for Tahara Machinery Ltd., one of the earliest entrants in electric blow molding.

Electrovaya?s program will be focused on the production of integrated battery systems for Phoenix Motorcars? long-range, zero-emission, electric, sports utility vehicles?and sport utility trucks. These battery systems will feature Electrovaya?s proprietary Lithium Ion SuperPolymer? battery technology and integrated intelligent battery management system.

Applications requiring adjustable speed operation with full torque from zero to base speed and constant horseposer to maximum speed. Full torque at zero speed ? Applications include vending machines, automatic retailing machines, peristaltic pumps, photocopiers. Rotalink differentiates itself via a wide range of off-the-shelf market oriented products, involving high research and development investments.
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