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. 06, 2019
Filed:
Dec. 14, 2017
Applicant:
Nidec Corporation, Kyoto, JP;
Inventors:
Assignee:
NIDEC CORPORATION, Kyoto, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 5/68 (2006.01); B60L 11/14 (2006.01); H02P 29/60 (2016.01); G01N 25/00 (2006.01); H02P 29/40 (2016.01); H02P 5/00 (2016.01); G01K 3/10 (2006.01); H02P 27/08 (2006.01);
U.S. Cl.
CPC ...
H02P 29/60 (2016.02); G01K 3/10 (2013.01); G01N 25/00 (2013.01); H02P 5/00 (2013.01); H02P 27/08 (2013.01); H02P 29/40 (2016.02);
Abstract
A method for estimating a service life of a motor that is driven by variable duty cycle control. The method includes calculating an elapsed service life ratio representing a ratio of an elapsed service life to all service life according to the following formula to estimate the service life of the motor: where Lrepresents the elapsed service life ratio, trepresents a driving time in a section i, Lrepresents a service life expectancy at a duty cycle Din the section i and at an environmental temperature of the motor being 40° C., and Krepresents a temperature in the section i.