公开(公告)号：US20220135120A1

公开(公告)日：2022-05-05

申请号：US17435248

申请日：2020-12-16

Applicant: NSK LTD.

Inventor： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

IPC: B62D5/04 ,  H02P25/03 ,  H02P23/14 ,  G01D5/16 ,  G01B7/30 ,  G01P3/487

Abstract: A phase adjustment method for a rotation angle sensor configured to detect a rotation angle of a rotor of a brushless motor, the phase adjustment method including: measuring a first rotation speed and a second rotation speed when the brushless motor is driven with a same torque command current to rotate clockwise and counterclockwise, respectively, on a basis of the rotation angle of the rotor detected by the rotation angle sensor; and calculating a correction value to correct a phase of the rotation angle sensor so that a rotation speed difference between the first rotation speed and the second rotation speed decreases.

公开(公告)号：US20220009548A1

公开(公告)日：2022-01-13

申请号：US17299884

申请日：2020-12-21

Applicant: NSK LTD.

Inventor： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

IPC: B62D5/04

Abstract: A detection signal correction method includes: calculating a rotation angle of a rotation shaft of a motor, based on a detection signal of a sensor; calculating a steering velocity of a steering shaft based on the rotation angle; calculating an error of the detection signal; and correcting the error of the detection signals when the steering velocity is equal to or greater than a steering velocity threshold value and the error of the detection signal is equal to or greater than an error threshold value.

公开(公告)号：US20210354756A1

公开(公告)日：2021-11-18

申请号：US17299921

申请日：2020-12-16

Applicant: NSK LTD.

Inventor： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

IPC: B62D15/02 ,  G01D18/00 ,  G01D5/16 ,  B62D5/04

Abstract: A calibration method in which, a rotation angle calculation device calculates a rotation angle based on a detection signal of a sensor, transmits rotation angle data indicating the rotation angle to a calibration device, and transmits time difference data relating to a time difference after having captured the detection signal until transmitting the rotation angle data to the calibration device, and in which the calibration device measures a rotation angle, clocks a measurement time at which the rotation angle is measured and a transmission time of transmitting or receiving the rotation angle data, and acquires calibration data of the rotation angle data by comparing the rotation angle measured at a time obtained by going back in time from the transmission time by the time difference after having captured the detection signal until transmitting the rotation angle data and the rotation angle data with each other.

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：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.