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:
May. 25, 2004
Filed:
Jan. 17, 2003
Shinya Naito, Shizuoka, JP;
Haruyoshi Hino, Shizuoka, JP;
Yamaha Hatsudoki Kabushiki Kaisa, Shizuoka-ken, JP;
Abstract
To decrease torque ripples and cogging torque, a rotor for an electrical motor, an electrical generator, or the like, includes lengths of permanent magnets embedded in a plurality of slit sections in respective layers. In an embodiment having three layers, the permanent magnets have lengths L , L and L in order as viewed from the outside circumference side of the rotor core and generate respective total magnetic fluxes of &PHgr; , &PHgr; , &PHgr; , respectively, when the rotor is assembled in a rotary electric device. The lengths have a relation L <L <L , and the magnetic fluxes have a relation &PHgr; <&PHgr; <&PHgr; .
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile