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:
Jun. 15, 2010
Filed:
Feb. 18, 2009
Mamoru Kimura, Hitachi, JP;
Kazumasa Ide, Hitachiota, JP;
Kazuo Nishihama, Hitachi, JP;
Tetsuo Fujigaki, Hitachi, JP;
Shuji Mizutani, Hitachinaka, JP;
Mamoru Kimura, Hitachi, JP;
Kazumasa Ide, Hitachiota, JP;
Kazuo Nishihama, Hitachi, JP;
Tetsuo Fujigaki, Hitachi, JP;
Shuji Mizutani, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An electric rotation machine for windmill power generation equipped with a stator slot structure having distributed windings and a rotor pole structure having permanent magnets, wherein the number of slots per pole per phase (Nspp) is undividable by 3 times P (where P is the number of poles), and pole width rate Pw obtained by dividing pole piece width Tp by pole pitch Tr at the outermost diameters of the adjoining poles of the rotor is satisfied any of Pw≦0.6, 0.67≦Pw≦0.71, and 0.78≦Pw. The distortion factors of induced voltages in a permanent magnet type electrical rotation machine, particularly for windmill power generation, can be reduced.