Patent ID: 8339010
Filing Date: 2012-12-25
Classification: H02K

Abstract:
1. An electric motor, comprising: an inner circumference side rotor, an outer circumference side rotor having a rotary shaft that is coaxial with a rotary shaft of the inner circumference side rotor; and a rotating device capable of changing the relative phase between the inner circumference side rotor and the outer circumference side rotor by rotating at least one of the inner circumference side rotor and the outer circumference side rotor around the rotary shaft, wherein the inner circumference side rotor includes substantially plate-like inner circumference side permanent magnets arranged along a peripheral direction; the outer circumference side rotor includes substantially plate-like outer circumference side permanent magnets arranged along the peripheral direction; the inner circumference side permanent magnets and the outer circumference side permanent magnets include long sides that face each other, in a cross section perpendicular to the rotary shaft, by the rotation of at least one of the inner circumference side rotor and the outer circumference side rotor with the rotating device; and at least one of outer circumference side permanent magnets and inner circumference side permanent magnets abut on an unaffixed core surface of a separate rotor.