On the generation of the torque in a ball bearing motor

概要

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We examined the generation of torque in a ball bearing motor from the electromagnetic viewpoint, i.e., the possibilitythat the torque was generated by current in the metal spheres. We noticed that a repulsive force between the conductorswas generated by the magnetizing currents, if the conductors were close to each other. Based on this fact, we examinedthe current route in the motor. As a result, we noticed that the current direction into the spheres and out of the spheresis in the opposite direction as each contact between the outer ring and the metal sphere, and the metal sphere and theinner ring of the bearing was passed, i.e., the contact is made at a boundary, and the current direction in the inner ringis opposite to that in the outer ring. From this fact, a repulsive force due to the magnetizing current occurs between theconductors which form each contact, and we took this force as the origin of the torque in this motor. The factor whichdetermines the direction of rotation coincides with the non-directional rotational characteristic of this motor, because itis not included in the generation of this repulsive force. Simply put, the motor rotates in either direction.
2010-07-14