| 摘要 |
PURPOSE:To rotatably drive a rotor while supporting it in non-contact by the use of a single stator and coil by controlling displacements of the rotor on the basis of the amplitude of a current, and simultaneously, changing a phase of the current so as to rotate a magnetic field produced by the coil around the rotor. CONSTITUTION:An induced current is generated in a rotor 2 in the same principle as that of an induction motor. Interaction between the induced current and a magnetic field produced by a coil applies rotation driving force in the clockwise direction to the rotor 2. Adjustment of a current switching speed of the coil wire can control a rotating speed of the rotor 2. Attraction force exerted on the rotor 2 is dependent on an absolute value of the current flowing in the coil wire 3 irrespective of the direction of the current flowing in the coil wire 3. If a displacement (x) of the rotor in the lateral direction and a displacement (y) thereof in the vertical direction are measured, suitable adjustment of the attraction force can control the vertical and lateral positions of the rotor 2 in the sheet. |
