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:
Apr. 01, 2025
Filed:
May. 24, 2023
Okuma Corporation, Aichi, JP;
Satoshi Eguchi, Aichi, JP;
OKUMA CORPORATION, Niwa-gun, JP;
Abstract
A position control apparatus detects currents of processing object phases which flow through the three-phase AC motor, applies offset compensation processing to current detected values of the processing object phases based on offset compensation amounts, and controls the three-phase AC motor based on the current detected values of the processing object phases after the offset compensation processing. Processing of obtaining the offset compensation amounts includes processing of obtaining a Fourier coefficient of a frequency component of a torque ripple based on a torque command value signal, processing of obtaining torque amplitude components of the processing object phases, and processing of obtaining the offset compensation amounts with respect to the processing object phases based on the torque amplitude components of the processing object phases.