Patent ID: 8030816
Filing Date: 2011-10-04
Classification: B60L,H02K,H02P,Y02T

Abstract:
1. A motor comprising; a rotor capable of rotating about a rotational axis; and a first stator and a second stator that are arranged opposed to each other in the rotational axis direction so as to sandwich said rotor from both sides thereof in said rotational axis direction, wherein said rotor is provided with: a plurality of main permanent magnets arranged in a circumferential direction, with the magnetization direction thereof parallel with said rotational axis direction; and a first sub permanent magnet and a second sub permanent magnet arranged in the proximity of both end sections in said rotational axis direction of said main permanent magnet, with the magnetization direction thereof parallel with a direction orthogonal to said rotational axis direction and the radial direction, wherein among two pairs of said first sub permanent magnet and said second sub permanent magnet: one pair of said first sub permanent magnet and said second sub permanent magnet is arranged in the proximity of an end section on one side in said circumferential direction of said main permanent magnet; and the other pair of said first sub permanent magnet and said second sub permanent magnet is arranged in the proximity of an end section on the other side in said circumferential direction of said main permanent magnet, and wherein said rotor is provided with: a first sub permanent magnet mounting layer having said first sub permanent magnets mounted thereon; a main permanent magnet mounting layer that is laminated, in said rotational axis direction, on said first sub permanent magnet mounting layer and that has said main permanent magnets mounted thereon; and a second sub permanent magnet mounting layer that is laminated, in said rotational axis direction, on said main permanent magnet mounting layer and that has said second sub permanent magnets mounted thereon; and there is provided a phase change device that, by turning at least either one of said first sub permanent magnet mounting layer and said second sub permanent magnet mounting layer, and said main permanent magnet mounting layer about the rotational axis, changes the relative phase between said first sub permanent magnet mounting layer and said second sub permanent magnet mounting layer, and said main permanent magnet mounting layer.