
The single phase induction motor is basically a self starting using a run capacitor. All the motors require these starting capacitors without this the induction motor does not start. So in absence of this starting capacitor the motor has to be started and stopped manually. If the start capacitor selected for a specific induction motor is not exact as designed for the motor it may lead to un uniform magnetic field in the motor windings..
This leads to the noise in the motor and leads to mechanical failure. In order to resolve this problem, a microcontroller is programmed to control and operate induction motor. Using a microcontroller 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.