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:
Jul. 29, 2025
Filed:
Mar. 29, 2022
Jtekt Corporation, Kariya, JP;
JTEKT CORPORATION, Kariya, JP;
Abstract
A control device calculates a voltage command value for an inverter by executing feedback control that causes a current value of a three-phase motor to follow a current command value for the motor. The control device includes a compensation calculator that calculates, using a rotation angle of the motor, a correction voltage added to the voltage command value to compensate for torque ripple of the motor. The correction voltage is a sine wave that is in antiphase with the torque ripple, and is obtained by adding together a real part, a cosine wave component, and an imaginary part, a sine wave component that have the same frequency. The compensation calculator is configured to calculate amplitudes of the cosine wave component and the sine wave component from the current command value and a rotation speed of the motor.