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:
Dec. 08, 2020
Filed:
Aug. 08, 2019
Nidec Corporation, Kyoto, JP;
Nidec Elesys Corporation, Kawasaki, JP;
Masanori Watahiki, Kyoto, JP;
Tomonari Mori, Kyoto, JP;
Tomoya Ueda, Kyoto, JP;
Shuji Endo, Kyoto, JP;
Tokuji Tatewaki, Kawasaki, JP;
NIDEC CORPORATION, Kyoto, JP;
NIDEC ELESYS CORPORATION, Kanagawa, JP;
Abstract
A motor controller includes an inverter that drives a motor, an operation controller that controls the inverter according to a current command value, and a torque ripple compensation generator that adds a compensation value to compensate for a torque ripple in the motor to the current command value. The operation controller uses, as the current command value, a q-axis current command value indicating a q-axis current in a rotational coordinate system of the motor, and also uses, as the current command value, at least temporarily a d-axis current command value indicating a d-axis current in the rotational coordinate system, and the torque ripple compensation generator calculates a phase difference of the compensation value with respect to the q-axis current command value according to an equation using the q-axis current command value and the d-axis current command value as variables.