公开(公告)号：US20200255055A1

公开(公告)日：2020-08-13

申请号：US16499709

申请日：2018-10-26

Applicant: NSK Ltd.

Inventor： Hiroaki TAKASE ,  Ryo MINAKI ,  Takayoshi SUGAWARA ,  Kouichi NAMPEI

IPC: B62D5/04 ,  B62D6/00 ,  H02P27/08

Abstract: A motor control device for performing PWM control of an inverter for driving a three-phase brushless motor on the basis of a current command value, wherein the motor control device is provided with: a voltage command value computation unit for calculating a voltage command value using the current command value, and a motor rotation speed and a motor electric angle acquired for each control cycle from the three-phase brushless motor; an electric angle interpolation unit for estimating an interpolated electric angle from the motor electric angle at division intervals obtained by dividing the control cycle; a conversion unit for calculating a three-phase Duty command value from the voltage command value and the motor electric angle, and calculating a three-phase interpolated Duty command value from the voltage command value and the interpolated electric angle; and an output setting unit for switching between, and outputting, the three-phase Duty command value and the three-phase interpolated Duty command value so as to match the division intervals.

公开(公告)号：US20180290682A1

公开(公告)日：2018-10-11

申请号：US15531535

申请日：2016-03-09

Applicant: NSK LTD.

Inventor： Kouichi NAMPEI ,  Yoshihiro AOSAKI

IPC: B62D5/04 ,  H02P29/028

Abstract: [Problem] An object of the present invention is to provide a motor control unit that improves a discontinuous feeling of an assist by flexibly making an adjustment of a current command value of a normal system when a failure occurs in any system of multi-system motor control, and enables smooth handling, and to provide an electric power steering apparatus and a vehicle equipped with the same.[Means for Solving the Problem] A motor control unit comprises motor driving circuits of respective winding systems that supply a motor having multi-system motor windings with driving currents; and a control calculating section that calculates a current command value of each winding system for driving the motor, when a failure occurs in the motor winding or the motor driving circuit in any of the systems, performs a first change of changing a characteristic of the current command value of a normal system to a first characteristic that forms a characteristic equivalent to a total of the current command values at normal time, after performing the first change, performs a second change of changing the characteristic of the current command value to a second characteristic whose output is more suppressed than the first characteristic, and controls the motor driving circuit.

公开(公告)号：US20180093702A1

公开(公告)日：2018-04-05

申请号：US15549012

申请日：2016-07-25

Applicant: NSK Ltd.

Inventor： Kouichi NAMPEI

IPC: B62D5/04

CPC classification number: B62D5/0484 ,  B62D5/0409 ,  B62D5/0463 ,  B62D5/0487 ,  B62D5/049 ,  H02P6/16 ,  H02P29/028 ,  H02P2203/05

Abstract: There are provided a motor control apparatus, an electric power steering apparatus, and a vehicle, capable of controlling the driving of an electric motor accurately even when a failure occurs in a motor electric angle detecting unit that detects a motor electric angle. The motor control apparatus includes: a relative offset amount estimating unit that estimates a relative offset amount between a reference value of an output shaft rotational angle detection value of a steering shaft, detected by an output-side rotational angle sensor, and a motor electric angle original point of a three-phase electric motor; and a motor electric angle estimating unit that calculates a motor electric angle estimate (θme) based on the output shaft rotational angle and the relative offset amount, wherein when at least either one of a resolver and an angle computing unit is abnormal, the driving of the three-phase electric motor is controlled based on the motor electric angle estimate estimated by the motor electric angle estimating unit.

公开(公告)号：US20170117833A1

公开(公告)日：2017-04-27

申请号：US15307417

申请日：2015-07-13

Applicant: NSK LTD.

Inventor： Kenji MORI ,  Kouichi NAMPEI ,  Yoshihiro AOSAKI

IPC: H02P6/17 ,  H02P27/08 ,  B62D5/04 ,  H02P21/22

CPC classification number: H02P6/17 ,  B62D5/046 ,  B62D5/0484 ,  B62D5/0487 ,  H02P21/22 ,  H02P25/22 ,  H02P27/08 ,  H02P29/024

Abstract: A motor control unit that does not make an occurrence of a noisy sound and a vibration and does not give a steering discomfort by changing parameters of a current feedback control section even if an electric characteristic of the motor varies with a system-switching due to a failure occurrence, and to an electric power steering apparatus using the same and a vehicle. The motor control unit controls a motor having multi-system motor windings by means of a 3-phase current feedback system provided with a current control section through a motor driving circuit of each winding system, having a function that changes by switching parameters of the current control section corresponding to a driving system number of the multi-system motor windings.