| 摘要 |
PURPOSE:To realize miniaturization and high performance of a multipole- magnetized cylindrical permanent magnet by composing said magnet of a resin magnet consisting of a specific Fe-B-R system quenched fine piece and a binder. CONSTITUTION:A PM-type pulse motor is formed of a rotor 1 having a resin magnet (Fe-B-R system resin magnet) having uniformly 10 poles-magnetized the outer peripheral surface and a stator portion consisting of an inner yoke 3 joined to outer yokes 2a, 2b and exciting coils 4a, 4b. In this case, an Fe-B-R system quenched fine piece (125mum and below) with the composition of Nd<0.13>(Fe<0.93>, B<0.07>)<0.83> and epoxy resin are mixed with each other and compression molded to prepare said resin magnet. As a result, the resin magnet has a higher performance as compared with a rare earth cobalt resin magnet and the maintenance of performance and the reliability can be secured advantageously.
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