公开(公告)号：US20230421084A1

公开(公告)日：2023-12-28

申请号：US18035295

申请日：2022-03-31

Applicant: MITSUBA Corporation

Inventor： Ryo OHORI ,  Tsuyoshi OSAWA ,  Atsushi MOCHIDA

IPC: H02P23/14 ,  H02P27/08

CPC classification number: H02P23/14 ,  H02P27/08

Abstract: The invention reduces the stoppage of operation due to a sudden decrease in rotation speed. A motor device includes a motor that is rotationally driven; a drive signal generator that controls a duty ratio indicating a drive output of the motor so as not to exceed a duty ratio upper limit value, and generates a drive signal corresponding to the duty ratio; an inverter that outputs an output signal for rotationally driving the motor based on the drive signal; a rotation speed detector that detects a rotation speed of the motor; an acceleration detector that detects whether the motor is accelerating; and an upper limit value setting part that changes the duty ratio upper limit value to a second upper limit value higher than a preset first upper limit value in response to rotation of the motor being accelerating.

公开(公告)号：US20240123943A1

公开(公告)日：2024-04-18

申请号：US18327880

申请日：2023-06-01

Applicant: MITSUBA Corporation

Inventor： Ryo OHORI ,  Toshiyuki AMAGASA ,  Masahiro YAMADA ,  Atsushi MOCHIDA ,  Tamotsu IWAZAKI

IPC: B60S1/08

CPC classification number: B60S1/08

Abstract: A motor control device includes a driving control part and an upper limit value setting part. The driving control part controls motor driving by switching between a first driving mode and a second driving mode, and controls an output duty ratio so as not to exceed a duty ratio upper limit value. The upper limit value setting part sets, as the duty ratio upper limit value, a low rotation duty ratio upper limit value, a maximum duty ratio upper limit value corresponding to a maximum output value, and an upper limit value of a transition period from the low rotation duty ratio upper limit value to the maximum duty ratio upper limit value, and changes slope information indicating a change amount in the upper limit value of the transition period according to the driving mode when switching between the first driving mode and the second driving mode.