公开(公告)号：US11873039B2

公开(公告)日：2024-01-16

申请号：US17281083

申请日：2020-10-02

Applicant: NSK LTD.

Inventor： Yasutoshi Miki ,  Masahiro Maeda

IPC: B62D5/04 ,  H02P27/08 ,  H02P21/22 ,  H02P21/05

CPC classification number: B62D5/046 ,  B62D5/0409 ,  H02P21/05 ,  H02P21/22 ,  H02P27/08

Abstract: A motor control device includes a third harmonic calculation unit configured to calculate a first third harmonic on a basis of an average value between a voltage command value of a maximum phase with a maximum duty ratio and a voltage command value of a minimum phase with a minimum duty ratio among three-phase voltage command values; an amplitude calculation unit configured to calculate an amplitude of the three-phase voltage command values; a third harmonic conversion unit configured to convert the first third harmonic into a second third harmonic on a basis of the first third harmonic and the amplitude; a correction unit configured to correct the three-phase voltage command values by subtracting the second third harmonic from the three-phase voltage command values.

公开(公告)号：US11104376B1

公开(公告)日：2021-08-31

申请号：US17260735

申请日：2020-02-07

Applicant: NSK LTD.

Inventor： Yasutoshi Miki

IPC: H02M1/32 ,  H02M7/5387 ,  H02P27/06 ,  B62D5/04 ,  H02M1/00

Abstract: A power supply current control device including: a current limit value calculation unit configured to calculate a current limit value on a basis of a difference between a power supply voltage and a predetermined set voltage, a power supply current, and a resistance model representing a resistance component of the power supply circuit; a power supply current limit unit configured to limit a magnitude of the power supply current on a basis of the current limit value; a change rate limit value calculation unit configured to calculate a change rate limit value on a basis of the difference and a change speed of the power supply voltage; and a power supply current change rate limit unit configured to limit a change rate of the power supply current on a basis of the change rate limit value.

公开(公告)号：US11827291B2

公开(公告)日：2023-11-28

申请号：US17281083

申请日：2020-10-02

Applicant: NSK LTD.

Inventor： Yasutoshi Miki ,  Masahiro Maeda

IPC: B62D5/04 ,  H02P27/08 ,  H02P21/22 ,  H02P21/05

CPC classification number: B62D5/046 ,  B62D5/0409 ,  H02P21/05 ,  H02P21/22 ,  H02P27/08

Abstract: A motor control device includes a third harmonic calculation unit configured to calculate a first third harmonic on a basis of an average value between a voltage command value of a maximum phase with a maximum duty ratio and a voltage command value of a minimum phase with a minimum duty ratio among three-phase voltage command values; an amplitude calculation unit configured to calculate an amplitude of the three-phase voltage command values; a third harmonic conversion unit configured to convert the first third harmonic into a second third harmonic on a basis of the first third harmonic and the amplitude; a correction unit configured to correct the three-phase voltage command values by subtracting the second third harmonic from the three-phase voltage command values.

公开(公告)号：US11104374B2

公开(公告)日：2021-08-31

申请号：US16638016

申请日：2019-07-12

Applicant: NSK LTD.

Inventor： Yasutoshi Miki

IPC: H02P21/00 ,  B62D5/04 ,  H02P27/06 ,  H02P21/06

Abstract: A motor control device including: a voltage command value calculation unit configured to calculate a voltage command value of voltage applied to a motor, based on a q-axis current command value and a d-axis current command value; a driving circuit configured to output driving power to the motor, based on the voltage command value; a d-axis current command value calculation unit configured to calculate the d-axis current command value limiting the voltage command value to a maximum voltage applicable to the driving circuit or less by field-weakening control; a d-axis current command value limitation unit configured to limit the d-axis current command value; and a q-axis current command value limitation unit configured to limit the q-axis current command value lest the voltage command value exceed the maximum voltage due to limitation of the d-axis current command value by the d-axis current command value limitation unit.

公开(公告)号：US10972033B2

公开(公告)日：2021-04-06

申请号：US16638269

申请日：2019-07-12

Applicant: NSK LTD.

Inventor： Yasutoshi Miki

IPC: H02P21/06 ,  H02P21/22 ,  B62D5/04 ,  H02P27/12

Abstract: A motor control device including: a power supply voltage detection unit configured to detect a power supply voltage; a rotational angular velocity detection unit configured to detect a rotational angular velocity of the motor; a command value calculation unit configured to calculate a q-axis and d-axis current command values; a gain computation unit configured to compute, based on an upper limit value of power supply current supplied from a power supply to the motor, the power supply voltage, the rotational angular velocity, the q-axis current command value, and the d-axis current command value, a limit gain reducing the power supply current to the upper limit value or lower by limiting the q-axis current command value and the d-axis current command value; and a driving circuit configured to drive the motor, based on the q-axis current command value and the d-axis current command value limited by the limit gain.