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:
Mar. 09, 2021
Filed:
Jun. 12, 2018
Minebea Mitsumi Inc., Nagano, JP;
MINEBEA MITSUMI INC., Nagano, JP;
Abstract
A motor drive control device capable of reducing the occurrence of vibration in a simple circuit configuration is provided. The motor drive control device () includes a motor drive unit () that selectively energizes coils with a plurality of phases (Lu, Lv and Lw) of a motor () and a control circuit () that outputs a drive control signal (Sd) which is a PWM signal to the motor drive unit () and thereby controls driving of the motor () while switching energization phases of the coils with the plurality of phases (Lu, Lv and Lw) energized by the motor drive unit () in predetermined order. The control circuit () executes reduction control to temporarily reduce a duty ratio of the drive control signal (Sd) every time a period of 1/m (m is an integer of 2 or more) of a switching cycle of the energization phases elapses after switching the energization phases.