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. 11, 2025
Filed:
Jun. 26, 2023
Nidec Powertrain Systems Corporation, Kanagawa, JP;
Yasuhiro Shirai, Kanagawa, JP;
NIDEC POWERTRAIN SYSTEMS CORPORATION, Kanagawa, JP;
Abstract
One aspect of a motor control device of the present invention is a motor control device that controls a three-phase motor, the motor control device including a drive circuit that converts DC power supply voltage into three-phase AC voltage and supplies the three-phase AC voltage to the three-phase motor, a voltage detection unit that detects terminal voltage of three phases of the three-phase motor, and a control unit that detects a point at which induced voltage appearing in each terminal voltage of the three phases intersects a predetermined zero-cross determination level as a zero-cross point, and controls the drive circuit based on a detection result of the zero-cross point. The control unit changes a value of the zero-cross determination level when the induced voltage of at least one of the three phases increases and when the induced voltage of at least one of the three phases decreases.