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:
Oct. 25, 2005
Filed:
Dec. 08, 2004
Hiroyuki Kozuki, Tokyo, JP;
Hiroyuki Kozuki, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An objective is to perform malfunction diagnosis such as a wire breakage of resolver windings using a simple circuit configuration, realize the cost down and reliability improvement for resolver malfunction diagnostic circuits, and reduce electric-power consumption in the resolver malfunction diagnostic circuits. A resolver malfunction diagnostic circuit includes a resolver-signal inputting circuit for, in response to rotation of a rotor, receiving signals from a resolver that outputs from its output winding rotational-angle signals corresponding to the rotor rotational angle, and the output winding is determined to be out of order when the amplitude of the output from the output winding is equal to or lower than a predetermined value, and a deviation between the center voltage of its output voltage and the center voltage in the normal operating state exceeds an allowable level.