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. 11, 2017
Filed:
Jan. 19, 2012
Applicants:
Yasuo Ibuki, Suzhou, CN;
Takafumi Ohba, Shiga, JP;
Kazunori Watanabe, Kyoto, JP;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K 33/00 (2006.01); H02P 25/02 (2016.01); H02P 25/032 (2016.01);
U.S. Cl.
CPC ...
H02P 25/027 (2013.01); H02P 25/032 (2016.02);
Abstract
An amplitude control unit () detects the amplitude of a movable element () that reciprocates relative to a stator (), detects fluctuations in a load over time according to detected fluctuations over time in the amplitude, and detects an abnormality on the basis of the detected fluctuations over time in the load. The amplitude control unit () outputs the detected amplitudes to a control output unit (). The control output unit () controls a drive current (Id) for reciprocating the movable element () on the basis of the amplitude information supplied from the amplitude control unit ().