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:
May. 22, 2001
Filed:
Jun. 29, 1999
Sanshiro Obara, Toukai-mura, JP;
Hiroshi Katada, Hitachinaka, JP;
Suetaro Shibukawa, Hitachinaka, JP;
Nobunori Matsudaira, Hitachi, JP;
Shotaro Naito, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method and apparatus for driving an electric vehicle having a synchronous traction motor. A peak value of induced electromotive force of the synchronous motor at a maximum allowable rotating speed is set to a value which is lower than an allowable voltage of the smoothing capacitor of the inverter and lower than a maximum allowable voltage of the power switching elements composing the inverter. The synchronous motor is thus constructed so that a peak value V,of the maximum induced electromotive force at the maximum allowable rotating speed N,of the synchronous motor satisfies a relation of V,≦V,where V,is an allowable voltage of the smoothing capacitor.