Patent ID: 6204626
Filing Date: 2001-03-20
Classification: B60L,H02P,Y02T

Abstract:
A method of driving a concentrated winding synchronous motor including a stator having a plurality of teeth, a first coil wound around a first tooth in a first phase, a second coil wound around a second tooth adjacent to the first tooth in a second phase and a rotor having a plurality of magnetic poles, the method comprising the steps of:correcting an amount of alternating current to be supplied to the first and second coils with respect to a reference alternating current for each phase so that, when the magnetic field produced by the first tooth is generated in a direction opposite to a direction of rotation of the rotor with respect to the closest pole of the rotor, the current supplied to the first coil is decreased to be smaller than the reference alternating current for the first phase for a predetermined first time period determined based on a time required for a first one of the poles of the rotor to move from a position opposing the first tooth to a position overlapping at least a portion of the first tooth and the adjacent second tooth, and the current supplied to the second coil of the second tooth is decreased to be smaller than the reference alternating current for the second phase for a predetermined second time period determined based on a time required for the first pole to move from the position overlapping the first and second teeth to a position opposing only the second tooth; andsupplying the corrected alternating current to the coils.