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:
Aug. 10, 2004
Filed:
Nov. 13, 2002
Hiroshi Kushihara, Nagano-ken, JP;
Tamagawa Seiki Kabushiki Kaisha, Nagano-Ken, JP;
Abstract
A sensor system for controlling a motor in a motor drive control system having a drive control circuit ( ) that controls the driving of a motor ( ) in accordance with an operation command, includes a main angle detecting unit ( ) having a resolver ( ) that detects the rotation angle of the motor ( ) and a sub angle detecting unit ( ) that estimates the rotation angle of the motor ( ) on the basis of the counter electromotive power of the motor ( ). The main angle detecting unit ( ) detects the rotation angle of the motor ( ) in a normal state, and the sub angle detecting unit ( ) detects the rotation angle of the motor ( ) when the main angle detecting unit ( ) is in failure.