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:
Nov. 26, 2013
Filed:
Nov. 25, 2009
Masaki Kono, Tokyo, JP;
Keita Hatanaka, Tokyo, JP;
Masaki Kono, Tokyo, JP;
Keita Hatanaka, Tokyo, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
A power conversion apparatus of an electric vehicle includes: a power converter for driving an induction machine based on arbitrary d- and q-axis voltage commands Vd* and Vq*, and a control unit for controlling the power converter based on a power running command P and a brake command B from outside. The control unit includes: a dq/three-phase conversion unit for converting phase current information iu, iv, and iw detected from the induction machine into d- and q-axis current detection values id and iq on orthogonal rotating coordinates; a speed determination unit for computing d- and q-axis voltage commands Vd* and Vq* for the power converter and determines that speed of the induction machine is zero based on the power running command P, the brake command B, and the d- and q-axis current detection values id and iq; and a resistance computing unit for computing a resistance value of the induction machine based on the power running command P, the d-axis current detection value id, and the d-axis voltage command Vd* when the brake command B is changed to the power running command P and the speed determination unit determines that the speed of the induction machine is zero.