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. 08, 2012
Filed:
Nov. 13, 2008
Satoru Kaneko, Naka, JP;
Tatsuyuki Yamamoto, Isehara, JP;
Tokihito Suwa, Hitachinaka, JP;
Yuuichirou Takamune, Naka, JP;
Kenta Katsuhama, Hitachiaka, JP;
Kimihisa Furukawa, Hitachi, JP;
Satoru Kaneko, Naka, JP;
Tatsuyuki Yamamoto, Isehara, JP;
Tokihito Suwa, Hitachinaka, JP;
Yuuichirou Takamune, Naka, JP;
Kenta Katsuhama, Hitachiaka, JP;
Kimihisa Furukawa, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
To provide a motor control apparatus that uses an inverter to drive an AC motor and hybrid automotive control apparatus adapted to drive an AC motor by use of an inverter while reducing torque pulsations during switching from PWM driving to rectangular-wave driving. The motor control apparatushas a PWM driving mode in which to input a PWM signal to the inverterand perform PWM driving of the AC motor, and a rectangular-wave driving mode in which to input a rectangular-wave signal to the inverterand perform rectangular-wave driving of the AC motor. For switching from the PWM driving mode to the rectangular-wave driving mode, a driving-pulse switching blockperforms the switching process within a maximum pulse-width range of high-level or low-level pulses developed in the PWM driving mode.