TAILIEUCHUNG - Single Phase Motors

Single Phase Motors • Similar to a 3 phase induction motor with squirrel cage rotor and main stator windgs. Main wndgs Centrifugal switch Rotor Laminated stator slots Wndgs Start wndgs .Run (main) and Start (Aux) Windings • The stator has two | Single Phase Motors Similar to a 3 phase induction motor with squirrel cage rotor and main stator windgs. Main wndgs Start wndgs Laminated stator slots Rotor Wndgs Centrifugal switch Run (main) and Start (Aux) Windings The stator has two sets of windgs, Run (which is of thicker size to reduce I²R losses) and Start of thinner size is placed 90˚ apart. Run has relative Large number of turns. Aux has relative Small number of turns. Starting Torque in Single phase motor To produce a starting torque a rotating magnetic field must be produced. This is done by including the Aux winding. When an AC source is applied the main windg produce a flux while the Aux wndg produces a flux Since the angles are out of phase a resultant rotating field is created A centrifugal switch disconnects the Aux. wndg from the supply after it has run up to 75% of full speed. Split Phase Principle

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