The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 08, 2025
Filed:
Mar. 31, 2022
Mitsuba Corporation, Gunma, JP;
MITSUBA Corporation, Gunma, JP;
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.