公开(公告)号：US10526010B2

公开(公告)日：2020-01-07

申请号：US16063428

申请日：2017-11-08

Applicant: NSK LTD.

Inventor： Takahiro Tsubaki ,  Haruhiko Kamiguchi ,  Tomohiro Miura ,  Nobuaki Kogure

IPC: B62D5/04 ,  H02H7/08 ,  H02P21/22 ,  H02P21/16

Abstract: An electric power steering apparatus includes a control substrate that controls a poly-phase motor having a multi-system motor winding, including a temperature sensor that detects a substrate temperature of said control substrate; and a coil temperature estimating section that obtains coil calorific values of respective phases of said poly-phase motor and a substrate calorific value of said control substrate by a motor current of said phase, and estimates a coil temperature of said phase by said coil calorific value, said substrate calorific value and said substrate temperature based on a heat transfer phenomenon between said respective phases that is caused by a difference in temperature between coils of said respective phases and a heat transfer phenomenon between said coil and said control substrate.

公开(公告)号：US10513290B2

公开(公告)日：2019-12-24

申请号：US16070973

申请日：2017-07-04

Applicant: NSK LTD.

Inventor： Takahiro Tsubaki ,  Tomohiro Miura ,  Takashi Sunaga ,  Nobuaki Kogure

IPC: B62D5/04 ,  H02P29/64

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.