Patent ID: 9318938
Filing Date: 2016-04-19
CPC Classification: H02K

Claim Text:
1. A shaftless electric machine comprising a stator and a rotor mounted for rotation about a rotor axis with respect to the stator, permanent magnets being carried by the rotor, an output on the rotor, the stator comprising coils wound on stator bars for interaction with the magnets of the rotor, the rotor having two stages arranged one at either end of the stator bars, with air gaps between the ends of the bars and the rotor stages, an annular housing retaining and mounting the stator; a bearing radially between the rotor and stator, the rotor being hollow around said rotor axis, said output comprising flange connection means and a flange by which the flange is connectable to the rotor for transmitting rotary power to or from the rotor, wherein the entire load between the output and the annular housing is transmitted through the bearing between the stator and rotor, whereby no other mounting of the rotor or its output with respect to the annular housing is provided, and the rotor stages each comprise an inner radial portion and an outer radial portion, the outer radial portion being spaced axially further away from the stator than the inner radial portion, the outer radial portion having an annular section on which are mounted said permanent magnets, the inner radial portions of the rotor stages are connected together such that the rotor stages and said stator enclose said bearing and the bearing is mounted on the inner radial portions of the rotor stages.