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:
Apr. 15, 2008
Filed:
Feb. 04, 2005
Toshihito Miyashita, Tokyo, JP;
Satoru Onodera, Tokyo, JP;
Toshihito Miyashita, Tokyo, JP;
Satoru Onodera, Tokyo, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
An interior permanent magnet rotary motor of the present invention has N slots and P permanent magnet magnetic pole sections, (⅔<=P/N<= 43/45). Po is an irreducible fraction Po/No of the P/N is an odd number, and a pole arc ratio ψequals θpp/θp. θpp is an angle between two line segments assumed for a pair of flux barriers, each of which connects the center of a rotor core and one of corners of the section of each flux barrier that is closest to the surface of the rotor core. θp is an angle obtained by dividing 360° by the number of the permanent magnet pole sections. The pole arc ratio indicated by Ψ(0<4n<1) is determined by the expression of Ψ=2mP/N+P/4LCM (P, N)−2n, where LCM (P, N) is the least common multiple between P and N, m and n are arbitrary natural numbers.