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:
Dec. 02, 2003
Filed:
Sep. 26, 2001
Mamoru Kimura, Hitachi, JP;
Haruo Koharagi, Juo, JP;
Hiroyuki Mikami, Hitachinaka, JP;
Miyoshi Takahashi, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A permanent magnet type rotating electrical machine characterized by reduced vibration and noise, or improved efficiency. In a permanent magnet type rotating electrical machine comprising a stator provided with concentrated winding and a rotor with permanent magnets embedded in the rotor core induced voltage waveform is improved by formation of two grooves or holes (flux barriers) extending in the axial direction for each magnetic pole on the bridge of the core between the permanent magnet insertion hole and the outer surface of rotor in such a way that they are placed at an equally spaced interval over the entire circumference of the rotor