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UNIT-1 SINGLE-PHASE INDUCTION MOTORS

UNIT-1 SINGLE-PHASE INDUCTION MOTORS INTRODUCTION: There are two basic reasons for the use of SINGLE-PHASE MOTORS rather than 3-phase MOTORS . 1. For reason of economy, most houses, offices and also rural areas are supplied with single phase , as power requirements of individual load items are rather small. 2. The economics of the motor and its branch circuit. Fixed loads requiring not more than can generally be served most economically with single phase power and a single phase motor . single phase MOTORS are simple in construction, reliable, easy to repair and comparatively cheaper in cost and therefore, find wide use in fans, refrigerators, vacuum cleaners, washing machines, other kitchen equipment, tools, blowers, centrifugal pumps, small farming appliances etc.

connected to the stator winding (it is assumed that there is no starting winding). Let the stator be wound for two poles. When power supply for the stator is switched on, an alternating current flows through the stator winding. This sets up an alternating flux. This flux crosses the air gap and links with the rotor conductors.

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