Patent ID: 8183729

Claim:
An electrically powered device having multiple brushless motors, each of the brushless motors comprising: a stator structured to have electromagnetic coils and a position sensor, the stator having a first face and a second face, the electromagnetic coils having two coil groups for two phases including a first coil group positioned on the first face of the stator and a second coil group positioned on the second face of the stator, the first coil group and the second coil group being positioned at locations phase-shifted by π/2 from each other; a shaft fastened to the stator, the shaft having a through-hole, the through-hole being formed along an axis of the shaft; a rotor unit structured to have permanent magnets and arranged to rotate around the shaft, the permanent magnets having two magnet groups including a first magnet group and a second magnet group, the rotor unit having a first rotor and a second rotor connected to the first rotor, the first rotor and the second rotor sandwiching the stator therebetween, the first rotor being positioned on one side of the stator and including the first magnet group, the second rotor being positioned on another side of the stator and including the second magnet group, the first magnet group and the second magnet group having magnetic poles and being positioned such that the magnetic poles that face towards the stator have mutually different polarities; a driven member linked to the rotor; a first wiring that is coupled to one of the brushless motors, the first wiring being provided through an inside of a part of the through-hole which the rotor unit actually rotates around; and a second wiring that is coupled to another of the brushless motors, the second wiring being provided through the inside of the part of the through-hole which the rotor unit actually rotates around; wherein all of the brushless motors are arranged to be spaced apart from one another.