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. 21, 2019
Filed:
Jan. 06, 2015
Applicant:
Daikin Industries, Ltd., Osaka-Shi, Osaka, JP;
Inventors:
Hiroshi Hibino, Kusatsu, JP;
Nobuki Kitano, Kusatsu, JP;
Assignee:
Daikin Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/12 (2006.01); H02P 21/18 (2016.01); H02P 25/024 (2016.01); H02P 8/38 (2006.01); H02P 21/00 (2016.01);
U.S. Cl.
CPC ...
H02P 6/12 (2013.01); H02P 8/38 (2013.01); H02P 21/00 (2013.01); H02P 21/18 (2016.02); H02P 25/024 (2016.02);
Abstract
A feedback amount calculation unit uses a deviation of a current from its command value or a deviation of an air-gap flux from its command value to calculate a feedback amount. A voltage error calculation unit calculates a variation range of a voltage error between a voltage value based on a voltage equation of the electric motor and a voltage command. The presence or absence of step-out of the electric motor is determined by comparison between the variation range of the voltage error and the feedback amount.