| 摘要 |
PURPOSE: A vibration motor is provided to increase starting torque and operating frequency band, adjust finely RPM, reduce dead points, and increase spinning synchronization. CONSTITUTION: A vibration motor comprises a lower case(8), two wound coils(2), a magnet plate(6) and an upper case(1). The magnet plate(6) is coupled to rotate around a rotation shaft(7) in a space formed by the coils(2). A magnet(5) is coupled to the magnet plate(6) to rotate around the rotation shaft(7). The lower case(8) is made of Fe and has a fixing groove(14) for the rotation shaft(7) and mount grooves(17) for the coils(2). Washer(3) are arranged between the magnet(5) and the lower case(8) and between the magnet(5) and an upper case(1) to minimize rubbing force due to rotation of the magnet(5). An oilless bearing(4) is arranged to minimize frictional force between a coupling cylinder(12) of the magnet plate(6) and the rotation shaft(7).
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