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    tagoheer's Avatar
    tagoheer Posts: 4, Reputation: 1
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    #1

    May 14, 2009, 02:48 AM
    What is the difference between single phase and three phase motor
    Why we use a capacitor in single phase but not in three phase motor?
    Scleros's Avatar
    Scleros Posts: 2,165, Reputation: 262
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    #2

    May 14, 2009, 05:01 AM
    One purpose is to delay energy to one of the motor coils to increase starting torque in single phase motors. The nature of 3 phase power provides the necessary torque.

    See Wikipedia: AC motor, Wikipedia: Electric Motor, HowStuffWorks: How Electric Motors Work, and All About Circuits: Single-phase induction motors.
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