Patent ID: 8400037

Claim:
A device for providing rotational torque, comprising: a driveshaft; a stator with a permanent main stator magnet, a permanent main stator magnet rotation mechanism that rotates the permanent main stator magnet in the stator, and a plurality of permanent magnets arranged in a circumferential arrangement relative to the rotor and increasing in magnetic flux density approaching the permanent main stator magnet; a rotor mounted to the driveshaft for rotation therewith and arranged on one side of the stator, the rotor including a pair of permanent rotor magnets on opposite sides, and a pair of permanent rotor magnet rotation mechanisms that respectively rotate the permanent rotor magnet in the rotor ; a power source for assisting rotation of the rotor; wherein the permanent main stator magnet rotation mechanism and the permanent rotor magnet rotation mechanisms are operable so as to cause the permanent main stator magnet and the permanent rotor magnet to have their pole faces pointed towards each other only as they are approaching.