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. 02, 2004
Filed:
Oct. 23, 2001
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K 7/08 ;
U.S. Cl.
CPC ...
H02K 7/08 ;
Abstract
In a brushless motor, a projected annular portion is formed in a central portion of a rotor frame and the projected annular portion has a bore that includes a small-bore portion and a large-bore portion. A length L of the small-bore portion is in a range of D×0.05≦L ≦D×0.20, where D represents the diameter of the shaft. An axial length L of the projected annular portion is arranged to satisfy L ≧L ×2. Thus, the brushless motor realizes a small and thin construction and has a high deflection precision as well as high productivity.