Patent ID: 6177777
Filing Date: 2001-01-23
Classification: H02P

Abstract:
A method for actuating and controlling permanent-magnet synchronous motors powered by alternating current supplied by a supply mains and comprising a permanent-magnet rotor and a stator which is provided with corresponding exciter windings, comprising, for the power supply of said stator, the modulation of the alternating mains voltage by applying thereto, through single-pole solid-state switches driven by microprocessor means, a DC component so as to correct the magnetic alignment of said rotor, said switches being adapted to adjust on command the starting rotation direction as well as the torque and synchronous rate values of said motor, the method further comprising the steps of:a) controlling, through sensor means which are arranged at said rotor and act thereat, the position of said rotor;b) injecting an asymmetric component which corresponds to the chosen rotation direction;c) controlling the motion of the rotor, moving on to the following step in case of a positive result and returning to step b) in case of a negative result;d) injecting a successive half-wave which corresponds to the rotation direction.