ELECTRICAL ENCYCLOPEDIA

What is an Induction Motor? http://en.wikipedia.org/wiki/Induction_motor   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 Motor http://www.allaboutcircuits.com/vol_2/chpt_13/9.html   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 du...