Induction Motor AC

One of the most common electrical motor used in most applications which is known as Induction Motor. This motor is also called as asynchronous motor because the rotor always turns at a lower speed than the field, making it an asynchronous AC motor. It runs at a speed less than its synchronous speed. AC induction motors are either single-phase or poly-phase. The Single phase power system is widely used as compared to three phase system for domestic purpose, commercial purpose and to some extent in industrial purpose.

The stator of the motor consists of overlapping winding offset. When the primary winding or the stator is connected to AC source, it establishes a rotating magnetic field which rotates at the synchronous speed. The theoretical speed of the rotor in an induction motor depends on the frequency of the AC supply and the number of coils that make up the stator and, with no load on the motor, comes close to the speed of the rotating magnetic field. It turns at a constant speed unless you use a variable-frequency drive.

The biggest advantage of AC induction motors is their sheer simplicity. They have only one moving part, the rotor, which makes them low-cost, quiet, long-lasting, and relatively trouble free. Induction motors can be fairly heavy and bulky because of their coil windings. Three phase IM are widely used in industrial drives, Lifts, Cranes, Driving lathe machine..etc because they are rugged, reliable and economical. Single-phase IM are used extensively for smaller loads, such as household appliances like fans, pumps, mixer, toys, vacuum cleaner, Drilling machines Etc.

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