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. 25, 2025
Filed:
Jan. 29, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Yasuaki Sato, Hitachinaka, JP;
Keisuke Suzuki, Hitachinaka, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Hideki Sekiguchi, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
Provided is a motor controller that can estimate the magnetic flux of a magnet without changing a current of an electric motor. A motor controllerincludes a current detecting unitthat detects a current of an electric motor, a current stability determining unitthat determines whether or not a current detected by the current detecting unitis stable, and a magnetic flux calculating unit (filtersto, a current conversion unit, a resistance calculating unit, a magnet magnetic flux estimating unit) that based on a determination made by the current stability determining unitas to current stability, calculates the magnetic flux of a magnet of the electric motor, according to a voltage equation in a rotating coordinate system, to output the calculated magnet flux. The motor controllerfurther includes a control voltage output unit (a map, voltage instruction unitsand, a first three-phase conversion unit) that outputs a control voltage to the electric motor, based on the magnetic flux of the magnet calculated by the magnetic flux calculating unit and on a torque instruction value.