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. 07, 2017
Filed:
Oct. 08, 2015
Denso Corporation, Kariya, Aichi-pref., JP;
Ryo Suzuki, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
A motor driving system includes an offset value learning part, which learns offset values of current sensors, when all switching elements are in off-states and a motor driving circuit is in an off-state, in which the motor driving circuit generates no motor driving current. The offset value learning part includes a first learning part and a second learning part. The first learning part learns the offset value of the current sensor of each phase at an arbitrary motor rotation angle, when an induced motor voltage of a three-phase motor is smaller than an input voltage of the motor driving circuit. The second learning part sequentially learns the offset value of the current sensor of the phase, a phase voltage value of which varying with the motor rotation angle is intermediate, when the induced motor voltage is equal to or larger than the input voltage.