| 摘要 |
The present invention relates to a coreless motor including a multi-stage rotor and a driving apparatus having the motor. More particularly, the present invention relates to a coreless motor including magnets and coils arranged, in multiple stages, to be concentric with a rotary central shaft and a driving apparatus having the a motor. According to an aspect of the present invention, a coreless motor including a multi-stage rotor comprises a rotor and a stator. The rotor includes a plurality of cylindrical yokes arranged in multiple stages in a radial direction, and a plurality of magnets fixed to the yokes in the respective stages in such a manner that polarities of the magnets fixed to the yoke in each stage are changed in a circumferential direction of the yoke. Further, the stator includes a plurality of cylindrical armature coil assemblies arranged in multiple stages to face the yokes, and each armature coil assembly includes a plurality of armature coils. The armature coils can be rigidly fixed using an epoxy resin to maintain their rigidity. Thus, the motor can produce power in a highly efficient way since it includes the multi-stage rotor and stator. Further, since the motor does not include a core, no cogging torque is produced to prevent the reduction of output torque and the output torque is kept constant to suppress noise and vibration.
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