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:
May. 26, 2026
Filed:
Oct. 26, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Takaya Tsukagoshi, Hitachinaka, JP;
Takafumi Hara, Tokyo, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Noriaki Hino, Hitachinaka, JP;
Shigehisa Aoyagi, Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
A motor control device that controls driving of an AC motor connected to a power converter performing power conversion from DC power to AC power, the AC motor driven using the AC power, includes a carrier wave generation unit that generates a carrier wave, a carrier wave frequency adjustment unit that adjusts frequency of the carrier wave, and a PWM control unit that performs pulse width modulation using the carrier wave on a voltage command corresponding to a torque command to generate a PWM pulse signal for controlling operation of the power converter, wherein the carrier wave frequency adjustment unit adjusts the frequency of the carrier wave so as to change a phase difference between the voltage command and the carrier wave based on magnitude of vibration for each circular order of electromagnetic excitation force generated circularly in a radial direction of the AC motor.