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. 23, 2020
Filed:
Jul. 12, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, Ibaraki, JP;
Takeshi Yoshida, Hitachinaka, JP;
Takafumi Hara, Tokyo, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Kazuto Oyama, Hitachinaka, JP;
Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;
Abstract
A control device and a control method for a rotary electric motor, and a rotary electric motor drive system capable of reliably suppressing vibration of the rotary electric motor are provided. A rotary electric motor is controlled by PWM at a predetermined carrier frequency, and in a case where a vibration frequency in a space zero-order eigenmode of the rotary electric motor and a frequency of a frequency component of electromagnetic exciting force that generates the eigenmode overlap with each other, a value of the carrier frequency is switched from a first value to a second value different from the first value.