Patent ID: 9203279
Filing Date: 2015-12-01
Classification: H02K,Y02E

Abstract:
1. An electric machine, comprising: a generally annular outer rotor supported to rotate about a rotational axis, the outer rotor defining an internal cavity therein and comprising a plurality of permanent magnets in the internal cavity generating a first magnetic field; an inner rotor in the internal cavity and supported to rotate about the rotational axis, the inner rotor comprising a plurality of permanent magnets about the perimeter of the inner rotor and generating a second magnetic field; a generally annular stator in the internal cavity between the outer rotor and the inner rotor, the stator comprising a stator winding supported by a non-magnetically conductive stator core and arranged to generate a third magnetic field that interacts with the first and second magnetic fields and drives the outer rotor and inner rotor to rotate; and a load, one of the outer rotor or the inner rotor mechanically coupled to drive the load and the other of the outer rotor or the inner rotor not mechanically coupled to drive the load.