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. 13, 2010
Filed:
May. 22, 2007
Muneaki Kurimoto, Obu, JP;
Hitoshi Ishikawa, Hekinan, JP;
Eiichiro Shigehara, Chofu, JP;
Aisin Seiki Kabushiki Kaisha, Kariya-shi, JP;
Abstract
A ripple detecting device for detecting a ripple from an armature current outputted from a motor by overlapping a low band noise having a frequency of one/n (wherein 'n' is a natural number more than 1) includes an initial ripple detecting device for detecting a cycle of the ripple in advance, a feature detecting device for detecting a feature of the ripple from the armature current outputted from the motor. The ripple detecting device further includes a ripple detecting control device for detecting the ripple by comparing the feature of the ripple with the low band noise having the frequency of one/n detected by the feature detecting device at a time before the present time with the feature of the ripple detected by the feature detecting device at the present time and judging that a ripple is generated when the features of the time before the present time and the present time present are resembled.