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:
Jun. 17, 2025
Filed:
Nov. 12, 2021
Oriental Motor Co., Ltd., Tokyo, JP;
Hikaru Umino, Tsukuba, JP;
ORIENTAL MOTOR CO., LTD., Tokyo, JP;
Abstract
An AC motor control device controls an inverter that supplies an alternating current to an AC motor which is a three-phase permanent magnet synchronous motor. The AC motor control device includes: pulse width modulation signal generation means that supplies a pulse width modulation signal to the inverter so that a position detection voltage vector for detection of the position of the rotor of the AC motor is applied to the AC motor; current derivative detection means that detects a current derivative occurring due to application of the position detection voltage vector to the AC motor; rotor position computation means that computes an estimated position of the rotor of the AC motor; rotor position correction means that corrects the estimated position; and drive control means that controls the pulse width modulation signal generation means so as to drive the AC motor.