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:
Mar. 08, 2011
Filed:
Dec. 17, 2008
Satoshi Kikuchi, Tokai, JP;
Hiroyuki Mikami, Hitachinaka, JP;
Akeshi Takahashi, Otaru, JP;
Tomio Yoshikawa, Mishima, JP;
Keiji Tanaka, Fujieda, JP;
Masashi Miyake, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Masaru Ohtahara, Shizuoka, JP;
Kenji Tojo, Moriya, JP;
Hideyuki Kumakura, Shizuoka, JP;
Satoshi Kikuchi, Tokai, JP;
Hiroyuki Mikami, Hitachinaka, JP;
Akeshi Takahashi, Otaru, JP;
Tomio Yoshikawa, Mishima, JP;
Keiji Tanaka, Fujieda, JP;
Masashi Miyake, Shizuoka, JP;
Baiying Huang, Shizuoka, JP;
Masaru Ohtahara, Shizuoka, JP;
Kenji Tojo, Moriya, JP;
Hideyuki Kumakura, Shizuoka, JP;
Hitachi Appliances, Inc., Tokyo, JP;
Abstract
A self-starting type permanent magnet synchronous motor comprises a stator and a rotor. The rotor comprises a rotor core having a plurality of slots provided in an outer periphery thereof and a cage winding comprising conductive bars embedded in the slots and conductive end rings that short-circuit the conductive bars on both end faces of the bars in an axial direction thereof. The rotor core comprises at least one magnet insertion hole arranged on an inner peripheral side from the slots, and at least one permanent magnet embedded in the at least one magnet insertion hole. When a pole center axis is denoted as a d-axis and an axis deviating from the pole center axis by an electrical angle 90° is denoted as a q-axis, a flux content generated by the cage winding during start-up becomes maximal in the vicinity of and on one of the d-axis and the q-axis.