Patent ID: 8816554
Filing Date: 2014-08-26
Classification: H02K

Abstract:
1. A motor forming a dual rotor motor comprising: a stator including a stator core formed of an annular yoke and a plurality of teeth, and a winding wound on the stator core; an inner rotor being rotatable with a shaft and disposed radially inside the stator, the inner rotor having a radially outer surface facing the stator and having a series of inner permanent magnets arranged in alternate polarities along the radially outer surface, each inner permanent magnet being polarized in a radial direction; an outer rotor being rotatable with the shaft and disposed radially outside the stator, the outer rotor having a radially inner surface facing the stator and having a series of outer permanent magnets arranged in alternate polarities along the radially inner surface, each outer permanent magnet being polarized in the radial direction; a clutch mechanism that couples and decouples the inner rotor to and from the shaft; and an actuator configured to move together with the clutch mechanism to adjust a relative angular position between the inner and outer permanent magnets, wherein the actuator is coupled to the inner rotor to adjust a relative angular position between the inner and outer permanent magnets and decoupled from the inner rotor when the motor is driven, and the relative angular position is adjustable between a first position at which the inner and outer permanent magnets are radially aligned at the same polarity and a second position at which the inner and outer permanent magnets are radially aligned at the opposite polarities; and wherein when the relative angular position is at the first position, the motor is operated at a low rpm, whereas when the relative angular position is at the second position, the motor is operated at a high rpm.