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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.
Inventor： Takahiro TSUBAKI , Tomohiro MIURA , Takashi SUNAGA , Nobuaki KOGURE
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.
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公开(公告)号：US20190337559A1
公开(公告)日：2019-11-07
申请号：US16063428
申请日：2017-11-08
Applicant: NSK LTD.
Inventor： Takahiro TSUBAKI , Haruhiko KAMIGUCHI , Tomohiro MIURA , Nobuaki KOGURE
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 by considering a heat transfer phenomenon between a control substrate and a coil in addition to a heat transfer phenomenon between respective phases of a poly-phase coil for a poly-phase motor having a multi-system motor winding, and enables the estimation of the coil temperature even when an abnormality occurs in any of the systems.[Means for Solving the Problem]An electric power steering apparatus comprises a temperature sensor that detects a substrate temperature of the control substrate; and a coil temperature estimating section that obtains coil calorific values of respective phases of the poly-phase motor and a substrate calorific value of the control substrate by a motor current of the phase, and estimates a coil temperature of the phase by the coil calorific value, the substrate calorific value 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; the coil temperature estimating section estimates the coil temperature by values that are obtained by correcting the coil calorific value and the substrate calorific value that are obtained in a normal system, and the substrate temperature, when an abnormality occurs in any of systems; and the heat transfer phenomenon is expressed by a differential equation.
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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.
Inventor： Takahiro TSUBAKI , Tomohiro MIURA , Takashi SUNAGA , Nobuaki KOGURE , Haruhiko KAMIGUCHI
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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