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INDUCTION MOTORS

An induction or asynchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction, rather than by slip rings and commutators as in slip-ring AC motors. These are widely used in industrial drives, particularly polyphase induction motors,[citation needed] because they are robust, have no friction caused by brushes, and can have the speed of the motor controlled easily..continue..

Single-phase induction motors are not self-starting without an auxiliary stator winding driven by an out of phase current of near 90o. Once started the auxiliary winding is optional.
The auxiliary winding of a permanent-split capacitor motor has a capacitor in series with it during starting and running.
A capacitor-start induction motoronly has a capacitor in series with the auxiliary winding during starting.
A capacitor-run motor typically has a large non-polarized electrolytic capacitor in series with the auxiliary winding for starting, then a smaller non-electrolytic capacitor during running.
The auxiliary winding of a resistance split-phase motor develops a phase difference versus the main winding during starting by virtue of the difference in resistance.continue..
An induction motor is a motor that provides power. It owes its name to the way it operates. Alternating current (AC) voltages are induced by the magnetic and rotating field of the stator in the rotor circuit. An induction motor is constructed with elements of copper, steel, and aluminum. While this makes them more expensive than universal motors, it also increases their quality and durability.continue..

For industrial and mining applications, 3-phase AC induction motors are the prime movers for the vast majority of machines. These motors can be operated either directly from the mains or from adjustable variable frequency drives. In modern industrialized countries, more than half the total electrical energy used in those countries is converted to mechanical energy through AC induction motors. The applications for these motors cover almost every stage of manufacturing and processing.
Applications also extend to commercial buildings and the domestic environment. They are used to drive pumps, fans, compressors, mixers, agitators, mills, conveyors, crushers, machine tools, cranes, etc, etc.continue..

The induction motor is the most commonly used type of ac motor. Its simple, rugged constructioncosts relatively little to manufacture. The induction motor has a rotor that is not connected to an externalsource of voltage. The induction motor derives its name from the fact that ac voltages are induced in therotor circuit by the rotating magnetic field of the stator. In many ways, induction in this motor is similarto the induction between the primary and secondary windings of a transformer.continue..
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