公开(公告)号：US20220135120A1

公开(公告)日：2022-05-05

申请号：US17435248

申请日：2020-12-16

申请人： NSK LTD.

发明人： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

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

摘要： 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：US20210354756A1

公开(公告)日：2021-11-18

申请号：US17299921

申请日：2020-12-16

申请人： NSK LTD.

发明人： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

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

摘要： 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：US20220009548A1

公开(公告)日：2022-01-13

申请号：US17299884

申请日：2020-12-21

申请人： NSK LTD.

发明人： Yusuke NISHIOKA ,  Yoshihiro AOSAKI ,  Hiroyuki YAMAMURA

IPC分类号： B62D5/04

摘要： 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.