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:
Jan. 08, 2013
Filed:
Mar. 06, 2009
Shigeto Takeuchi, Toyota, JP;
Tomotsugu Taira, Toyota, JP;
Shigeto Takeuchi, Toyota, JP;
Tomotsugu Taira, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
A control device controls a switching operation of a switching element such that an AC voltage allowing an AC motor to output torque in accordance with a torque command value is applied to a coil winding of each phase. The control device sets a gate resistance variably between a first pulse voltage at the time of reversal of polarity of the AC voltage and a remaining pulse voltage, in a drive circuit for turning on/off the switching element in response to a switching control signal. By making longer a time period for the first pulse voltage at the time of reversal of polarity to rise, occurrence of partial discharge in a gap between coil windings of respective phases is suppressed.