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. 29, 2017
Filed:
Dec. 15, 2015
Applicant:
Hitachi, Ltd., Chiyoda-ku, Tokyo, JP;
Inventors:
Yasuo Notohara, Tokyo, JP;
Eri Maruyama, Tokyo, JP;
Wataru Hatsuse, Tokyo, JP;
Ryouichi Takahata, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P 1/46 (2006.01); H02P 25/22 (2006.01); H02K 3/28 (2006.01); B60L 15/02 (2006.01); B60L 7/14 (2006.01); B60L 7/16 (2006.01); H02P 27/08 (2006.01); F25B 31/02 (2006.01);
U.S. Cl.
CPC ...
H02P 25/22 (2013.01); B60L 7/14 (2013.01); B60L 7/16 (2013.01); B60L 15/02 (2013.01); B60L 15/025 (2013.01); H02K 3/28 (2013.01); H02P 27/08 (2013.01); B60L 2210/40 (2013.01); B60L 2220/14 (2013.01); B60L 2220/56 (2013.01); B60L 2240/421 (2013.01); F25B 31/026 (2013.01); Y02T 10/641 (2013.01); Y02T 10/643 (2013.01); Y02T 10/7241 (2013.01);
Abstract
A permanent magnet synchronous motor includes at least two series-connected windings for each phase, and is configured to be driven by selecting the windings using a multi-inverter driving device configured to switch between an inverter for low-speed drive and an inverter for high-speed drive. A ratio of an induced voltage constant of at least one group of windings constituting the windings for the high-speed drive and a d-axis inductance is larger than a ratio of an induced voltage constant of all the series-connected windings to the d-axis inductance.