| 摘要 |
A device for rotary driving of a round disk (15), for instance a memory disk of a computer, comprises a stator (17) disposed fixedly relative to a frame and a rotor (15) rotatably drivable relative to the stator. According to the invention the rotor (15) comprises a concentric ring to which the peripheral edge of the disk is connected. The stator (17) has an encircling recess, the form of which corresponds to that of the ring such that the ring fits with clearance into the recess. The rotor is provided with two collars of magnetically active elements (39, 40) in angularly equidistant arrangement, and the stator comprises electromagnets (48, 49) disposed at the same angular distances. The arrangement is such that the rotor and the stator together form an annular induction motor. The rotor is preferably suspended magnetically during operation. |
