Patent ID: 9088236
Filing Date: 2015-07-21
Classification: H02P

Abstract:
1. A method for controlling, at steady-state, a synchronous electric motor comprising a permanent magnet rotor and a stator provided with windings connected to an electrical grid by means of a switch controlled by a processing unit, said method comprising the following steps: periodically switching on said switch by means of a PWM output of said processing unit; acquiring a first signal via an input of the processing unit, said first signal indicative of the counter electromotive force generated by the synchronous motor; acquiring a second signal via another input of the processing unit, said second signal indicative of the current fed to the windings; continuously checking in the processing unit the phase shift between said first signal and said second signal; and modifying in feedback the switched on period of the switch, and therefore the second signal, toward an ideal operating condition of the motor, wherein said ideal operating condition of the motor is defined as having a zero value of said phase shift, the modification of the switched on period by the PWM output providing a phase control to the motor.