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9 Single-phase Motors and Special Machin... > 9.3 WORKING PRINCIPLE OF SINGLE-PHAS...

9.3 WORKING PRINCIPLE OF SINGLE-PHASE INDUCTION MOTOR

For operation as a motor, there must be two fluxes that will interact with each other and produce the torque. The field winding in DC motor produces the main flux. The DC supply is given to the armature and armature flux is produced. The electromagnetic torque is produced due to the interaction of the above two fluxes. However, in single-phase induction motors, no DC supply is applied to the rotor and single-phase AC supply is applied to the stator only. Therefore, stator produces alternating flux which is known as main flux. This flux links with the rotor conductors and emf is induced in it due to transformer action. Since the rotor is a closed circuit, this emf drives the current through it resulting in rotor flux. Since the second flux ....induction motor


  

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