| 摘要 |
PURPOSE:To obtain a miniaturized and lightweight motor with less flux leakage by magnetizing the neighbourhood of a central shaft hole of a resin bracket combined with magnetic materials into the polarity reverse to that of a permanent magnet bracket side of a rotor. CONSTITUTION:A bracket 1 is formed by the injection molding of a thermal plastic resin combined with magnetic materials. The neighbourhood of a central shaft hole of a bracket 1 is magnetized to the polarity reverse to that of the bracket 1 side of a permanent magnet 5 of a rotor 3, while the periphery is magnetized to the same polarity. Thus the flux leakage outside the motor can be reduced without lowering the rotating torque substantially. Moreover, as the magnetic leakage can be checked in less combination amount of magnetic materials compared with the case where the unmagnetized bracket is used, the miniaturization of the bracket 1 can be achieved. Consequently, it is possible to obtain a miniaturized lightweight motor with less flux leakage.
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