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. 26, 2014
Filed:
Aug. 20, 2009
Kazuo Nishihama, Hitachinaka, JP;
Hiroyuki Mikami, Hitachinaka, JP;
Tadahiro Shimozono, Yachiyo, JP;
Keiichiro Kaihatsu, Kamagaya, JP;
Kazuo Nishihama, Hitachinaka, JP;
Hiroyuki Mikami, Hitachinaka, JP;
Tadahiro Shimozono, Yachiyo, JP;
Keiichiro Kaihatsu, Kamagaya, JP;
Hitachi Industrial Equipment Systems Co., Ltd., Tokyo, JP;
Abstract
A squirrel cage induction motor includes: a stator core (); a plurality of stator slots () radially disposed in a circumferential direction of the stator core () with predetermined intervals; a plurality of stator windings () housed in the stator slots respectively; a rotor core (); a plurality of rotor slots () radially disposed in a circumferential direction of the rotor core () with predetermined intervals; a plurality of rotor conductors () housed in the rotor slots () respectively. The stator windings () and the rotor conductors () includes electrically conductive materials mainly composed of copper. An area ratio of a total area of the stator slots () to a total area of the rotor slots () is not smaller than 2.7 and not greater than 8.0 to provide compatibility between the starting characteristic (starting torque) and the steady characteristic (for a high efficiency) can be provided.