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. 23, 2024
Filed:
Nov. 04, 2020
Hitachi Astemo, Ltd., Hitachinaka, JP;
Takaya Tsukagoshi, Tokyo, JP;
Takafumi Hara, Tokyo, JP;
Katsuhiro Hoshino, Hitachinaka, JP;
Toshiyuki Ajima, Tokyo, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
The vibration and noise generated in a permanent magnet synchronous motor are effectively suppressed. A motor control devicecomprises: a triangular wave generation unitwhich generates a triangular wave signal Tr that is a carrier wave, a carrier frequency adjustment unitwhich adjusts a carrier frequency fc that represents a frequency of the triangular wave signal Tr, and a gate signal generation unitwhich performs pulse-width modulation on three-phase voltage commands Vu*, Vv*, Vw* according to a torque command T* using the triangular wave signal Tr, thereby generating a gate signal for controlling an operation of an inverter. The carrier frequency adjustment unitadjusts the carrier frequency fc so as to change a voltage phase error Δθv representing a phase difference of the three-phase voltage commands Vu*, Vv*, Vw* and the triangular wave signal Tr based on the torque command T*, and a rotation speed ωr of a motor.