| 摘要 |
PURPOSE:To effectively distribute the mass of a rotary wheel participating in the efficiency of inertia relative to its center of rotation and to increase its rigidity in bearing an external force acting thereon by providing the rotary wheel with means for supporting the same without contacting at its outer periphery so as to gather the mass of the rotary wheel near the outer periphery thereof. CONSTITUTION:A rotary wheel 1 having a rotary axis C includes annular permanent magnets 2, 3 and pole pieces 4-7. The pole pieces 4-7 are opposed to an annular fixed members 8 through which magnetic flux phi1, phi2 originating from the permanent magnets 2, 3 passes so that the rotary wheel 1 is supported around an equilibrium point O. In the direction of an axis X, a difference of magnetic force is caused to appear by magnetic flux phi3 which appears when an electromagnetic coil 9 is energized, and a displacement of the rotary wheel 1 is detected by a detector 10, the result of the detection being amplified by an amplifier 11 and applied to the electromagnetic coil 9. Thus, an increase of torque can be attained by driving of the outer periphery of the rotary wheel 1 around the center of rotation thereof.
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