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:
Jul. 02, 2013
Filed:
Dec. 25, 2009
Kohei Yanai, Toyota, JP;
Kohei Yanai, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An electrical angle estimation section calculates an estimative electrical angle on the basis of an inductive voltage generated in a motor, and obtains an estimative electrical angle by correcting the estimative electrical angle by an electrical angle correction amount. On the basis of a detection value which represents the difference in electrical angle between the q-axis and the δ-axis calculated by an electrical-angle-error detection section, an electrical-angle-correction-amount computation section calculates an electrical angle correction amount such that the electrical angle of the δ-axis falls within a prescribed angular range, which lags behind the q-axis in terms of electrical angle. Thus, when sensorless control is performed, a phenomenon in which the motor loses synchronism can be restrained.