公开(公告)号：US12301080B2

公开(公告)日：2025-05-13

申请号：US17990946

申请日：2022-11-21

Applicant: DENSO CORPORATION

Inventor： Makoto Taniguchi ,  Yuuko Ohtani ,  Shinya Urata ,  Hideo Nakai ,  Kenji Hiramoto

IPC: H02P21/00 ,  H02K1/27 ,  H02K3/04 ,  H02K17/12 ,  H02P25/022

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.

公开(公告)号：US11955919B2

公开(公告)日：2024-04-09

申请号：US17352630

申请日：2021-06-21

Applicant: DENSO CORPORATION

Inventor： Makoto Taniguchi ,  Kazunari Moriya ,  Kenji Hiramoto ,  Hideo Nakai ,  Yuuko Ohtani ,  Shinya Urata ,  Masafumi Namba

IPC: H02P6/30

CPC classification number: H02P6/30 ,  H02P2207/05

Abstract: An electric motor system includes a battery, an inverter, an electric motor, a zero-phase switching arm and a control unit. The inverter converts DC power output from the battery into three-phase AC power and outputs the three-phase AC power to the electric motor. A rotor of the electric motor rotates by the three-phase AC power output from the inverter. A neural point of the electric motor is connected to the zero-phase switching arm. A zero-phase current flowing through respective windings of the electric motor is adjusted by switching of the zero-phase switching arm. By this means, in the electric motor system, torque is generated at the rotor also using the zero-phase current as well as a three-phase AC current flowing through the respective windings.