Driving method and driving device for motor
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasayuki Nakamura
Life of this patent
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Abstract
A device and method for driving a concentrated winding synchronous motor which, upon supply of a given electric current to a stator coil of the motor, generates an increased torque. Periodical corrections are executed to the waveform of the current to be supplied to the coils of each phase of the stator and corrections are executed to decrease the alternating current supplied to the coil of any tooth at which a portion of a magnetic field generated, with respect to the pole of the closest rotor, is in a direction reverse to a rotation of the rotor.
Claims9
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;
- and
- supplying the corrected alternating current to the coils.
A device for driving a concentrated winding synchronous motor comprising:
- a motor including a stator and rotor, wherein the stator includes a first coil wound around a first tooth formed on the stator in a first phase and a second coil wound around a second tooth formed on the stator adjacent to the first tooth in a second phase, and a magnet is provided on the rotor;
- a current supply device for supplying an alternating current to each of the first coil and the second coil;
- and
- a current regulating device for correcting an amount of alternating current 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 a rotor with respect to the closest pole of the rotor, the alternating 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 based on an amount of time required for a pole of the rotor to move from a position opposing the first tooth to a position opposing a bridge portion between the first and second teeth.
Dependencies are inferred from the claim text.