Patent ID: 8643453
Filing Date: 2014-02-04
Classification: H01F,H02K

Abstract:
1. A cylindrical bonded magnet that has a substantially cylindrical exterior shape, the cylindrical bonded magnet comprising: an integrally formed member comprising a compound of magnetic powder and resin, wherein said compound of said integrally formed member extends continuously from an imaginary line forming a longitudinal center axis of the integrally formed member to an outer surface of the integrally formed member and continuously from a first longitudinal end of the integrally formed member to a second, opposing longitudinal end of the integrally formed member, wherein said integrally formed member is magnetized so as to include a plurality of N and S poles that are alternately disposed in a continuous, uninterrupted manner along a length of the integrally formed member, wherein a total number of the N poles and S poles in said integrally formed member is even, and wherein a surface magnetic flux density distribution along a longitudinal direction of said cylindrical bonded magnet has a form of a substantially sinusoidal wave with ends of the sinusoidal wave corresponding to nodes, when the surface magnetic flux of said cylindrical bonded magnet is measured as viewed from a side of said cylindrical bonded magnet.