Motor system
AssigneeDenso Corporation
InventorsMakoto Taniguchi, Yuuko Ohtani, Shinya Urata, Hideo Nakai, Kenji Hiramoto
Life of this patent
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Abstract
A motor system of the present disclosure includes a permanent magnet motor including a stator having N-phase windings and a rotor having a permanent magnet, N being a natural number greater than or equal to three, an inverter that supplies N-phase drive currents for generating a rotating magnetic field to the stator, and a zero-phase current supply unit that supplies a zero-phase current to the N-phase windings of the stator. The motor system applies the zero-phase current to the N-phase windings in response to an inter-terminal voltage of the permanent magnet motor reaching a predetermined value of the inter-terminal voltage.
Claims14
A motor system comprising:
- a permanent magnet motor including a stator having N-phase windings and a rotor having a permanent magnet, N being a natural number greater than or equal to three;
- an inverter that supplies N-phase drive currents for generating a rotating magnetic field to the N-phase windings of the stator to rotationally drive the motor;
- and
- a zero-phase current supply that supplies a zero-phase current to the N-phase windings of the stator, wherein
- the zero-phase current is applied to the N-phase windings to superimpose the zero-phase current on the N-phase drive currents in response to an inter-terminal voltage of the permanent magnet motor reaching a predetermined value during drive of the permanent magnet motor with the N-phase drive currents supplied to the N-phase windings of the stator, the inter-terminal voltage of the permanent magnet motor being a voltage between a pair of terminals of the N-phase windings, and
- the zero-phase current is an Nth harmonic current with respect to a fundamental component of each of the drive currents.
A motor system comprising:
- a permanent magnet motor including a stator having N-phase windings and a rotor having a permanent magnet, N being a natural number greater than or equal to three;
- an inverter that supplies N-phase drive currents for generating a rotating magnetic field to the N-phase windings of the stator to rotationally drive the motor;
- and
- a zero-phase current supply that supplies a zero-phase current to the N-phase windings of the stator, wherein
- the zero-phase current is applied to the N-phase windings to superimpose the zero-phase current on the N-phase drive currents in response to an inter-terminal voltage of the permanent magnet motor reaching a predetermined value during drive of the permanent magnet motor with the N-phase drive currents supplied to the N-phase windings of the stator, the inter-terminal voltage of the permanent magnet motor being a voltage between a pair of terminals of the N-phase windings,
- the inverter includes N switching legs, and
- the zero-phase current supply includes a switching leg that is different from the N switching legs of the inverter.
Dependencies are inferred from the claim text.