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. 31, 2005
Filed:
Jan. 23, 2001
Masami Aizawa, Chiba-ken, JP;
Akihiro Ito, Chiba-ken, JP;
Masami Aizawa, Chiba-ken, JP;
Akihiro Ito, Chiba-ken, JP;
SEIKO Precision Inc., Chiba-ken, JP;
Abstract
To provide a rotor magnet which is small in size and provided with high magnetic energy, a rotor magnet is formed by adding a SmFeN magnetic powder to a binder such as a polyaxnide. The SmFeN magnetic powder is provided in a size of about one-tenth that of an NdFeB magnetic powder. Therefore, the density of the magnetic powder in the magnet can be made uniform. Accordingly, there is not any dispersion of the magnetic poles when a number of poles are magnetized and the magnet can be made smaller since the maximum energy product of the magnet is higher than that of an SmCo series magnet.