Construction of a single phase induction motor is similar to the construction of three phase induction motor
having squirrel cage rotor, except that the stator is wound for single
phase supply. Stator is also provided with a 'starting winding' which is
used only for starting purpose.
When the stator of a single phase motor is fed with single phase supply, it produces alternating flux in the stator winding. The alternating current flowing through stator winding causes induced current in the rotor bars (of the squirrel cage rotor ) according to Faraday's law of electromagnetic induction. This induced current in the rotor will also produce alternating flux. Even after both alternating fluxes are set up, the motor fails to start . However, if the rotor is given a initial start by external force in either direction, then motor accelerates to its final speed and keeps running with its rated speed
When the stator of a single phase motor is fed with single phase supply, it produces alternating flux in the stator winding. The alternating current flowing through stator winding causes induced current in the rotor bars (of the squirrel cage rotor ) according to Faraday's law of electromagnetic induction. This induced current in the rotor will also produce alternating flux. Even after both alternating fluxes are set up, the motor fails to start . However, if the rotor is given a initial start by external force in either direction, then motor accelerates to its final speed and keeps running with its rated speed
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