| 摘要 |
A system for controlling a rotatable device, the system comprising a controller and a rotary device, which has a stator and rotor, wherein the controller is connected to the rotary device to control rotation of the rotary device, and wherein the controller is adapted to periodically energizes at least one energizing coil of the device to create a magnetic field of a polarity which induces the rotor to rotate in a single direction and wherein the controller is switched off so as to de-energize the energizing coil when other forces, being forces other than those resulting from the energized energizing coil, produce a resultant force which induces rotation of the rotor in the single direction.
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