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:
Mar. 23, 2004
Filed:
Feb. 19, 2003
Taishi Iwanaga, Kyoto, JP;
Yasunori Yamamoto, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a motor driving device that produces a first PWM control signal and a second PWM control signal according respectively to different torque command signals for energizing motor coils of a plurality of phases with PWM control in parallel, wherein it is possible to avoid a situation where two-phase simultaneous energization continues for a long period of time. For this purpose, a PWM control section unconditionally turns OFF the first and second PWM control signals according to a first reset pulse signal and a second reset pulse signal, respectively, produced by an oscillation section. Thus, it is possible to avoid a situation where two phases are energized simultaneously for a long period of time, and to maintain the parallelism of the two phases being energized.