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:
Apr. 01, 2014
Filed:
Aug. 20, 2009
Hiroshi Suzuki, Okazaki, JP;
Hiroshi Suzuki, Okazaki, JP;
Jtekt Corporation, Osaka, JP;
Abstract
A current command value computation sectionis provided with a q-axis current command value correction sectionand an expected voltage utilization factor computation section. The expected voltage utilization factor computation sectionestimates an expected voltage utilization factor f based on a rotational angular velocity ω of a motor, a q-axis current command value Iq*, and a power voltage Vb (the maximum voltage Vmax). The expected voltage utilization factor f is the ratio of required output voltage to the maximum voltage Vmax applicable to a drive circuit. Based on the expected voltage utilization factor f, the q-axis current command value correction sectioncorrects the q-axis current command value Iq* such that the corrected expected voltage utilization factor f does not exceed a predetermined value that corresponds to the voltage saturation limit.