ELECTRIC POWER STEERING APPARATUS
    3.
    发明申请

    公开(公告)号:US20190337560A1

    公开(公告)日:2019-11-07

    申请号:US16070973

    申请日:2017-07-04

    Applicant: NSK LTD.

    Abstract: An electric power steering apparatus that enables more precise estimation of a coil temperature by considering a heat transfer phenomenon between a control substrate and a poly-phase coil in addition to a heat transfer phenomenon between respective phases of the coil. The apparatus includes a control substrate that controls a poly-phase motor, a temperature sensor that detects a substrate temperature of the control substrate and a coil temperature estimating section that estimates coil temperatures of respective phases of the poly-phase motor by a motor current of the phase and the substrate temperature based on a heat transfer phenomenon between the respective phases that is caused by a difference in temperature between coils of the respective phases and a heat transfer phenomenon between the coil and the control substrate.

    ELECTRIC POWER STEERING APPARATUS
    8.
    发明申请

    公开(公告)号:US20190267926A1

    公开(公告)日:2019-08-29

    申请号:US16348398

    申请日:2017-11-08

    Applicant: NSK Ltd.

    Abstract: [Problem] An object of the present invention is to provide an electric power steering apparatus that enables more precise estimation of a coil temperature for a poly-phase motor by considering a heat transfer phenomenon between a control substrate and a coil in addition to a heat transfer phenomenon between the coils.[Means for solving the problem] An electric power steering apparatus that comprises a control substrate that controls a poly-phase motor having two-system motor windings, comprises a temperature sensor that detects a substrate temperature of the control substrate, and a coil temperature estimating section that estimates all coil temperatures by all motor currents of the poly-phase motor and the substrate temperature based on a heat transfer phenomenon between all coils that is caused by a difference in temperature between the all coils and a heat transfer phenomenon between the coil and the control substrate.

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