bi_directional_rotation_of_single_phase_induction_motor.pdf | |
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A capacitor run single phase induction motor is usually a 2 phase asymmetrically wound motor. The main winding is designed to take the load current. The current flowing through the start winding having a capacitor in series, is much less than the main winding . In order to produce the magnetic force produced by the start winding very near to the main winding the start winding has additional turns, higher resistance and reduced current flowing through it. This makes the motor windings asymmetrical. The value of the capacitor is so chosen that the total impedance on the start winding produces sufficient phase shift of about 90 degrees to generate a rotating magnetic field.
Using a micro controller with a 3 phase bridge and using one as the common and the other 2 as 2 phases out of phase by 90 degrees produces the same effect. The program also takes care of reversing the rotation by automatically reversing the phases upon a push button.
Using a micro controller with a 3 phase bridge and using one as the common and the other 2 as 2 phases out of phase by 90 degrees produces the same effect. The program also takes care of reversing the rotation by automatically reversing the phases upon a push button.