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:
Feb. 24, 2026
Filed:
Mar. 20, 2024
Kabushiki Kaisha Toshiba, Tokyo, JP;
Carrier Japan Corporation, Tokyo, JP;
Takeshi Shibayama, Tokyo, JP;
Yoshitaka Uchiyama, Fuji, JP;
KABUJSHIKI KAISHA TOSHIBA, Tokyo, JP;
Carrier Japan Corporation, Tokyo, JP;
Abstract
An electric motor controller of an embodiment includes: a PWM signal generation unit that generates three-phase PWM signal patterns to follow a magnetic pole position of the motor; a current detection unit that detects a phase current of the motor; a current change amount detection unit that outputs a difference between current values detected twice for each of two phases, as current change amounts; and a magnetic pole position estimation unit that estimates a magnetic pole position of the motor based on the current change amounts. The PWM signal generation unit uses a triangular carrier wave, generates three-phase PWM signal patterns to allow the current detection unit to detect current of each two phase twice at timing of four points within a carrier wave period of the PWM signal, shifts a maximum phase in one direction of an advancing or delay side, and oppositely shifts a medium phase.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile