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Electric machine, including: stator, rotor frame, and pole configuration on rotor frame. The pole configuration includes a plurality of segment members arranged circumferentially around the rotor frame and fastened to the rotor frame with a bolt, placed in each segment Permanent magnet members on the inclined portions of the side edges of the members, a plurality of pole members arranged circumferentially around the rotor frame and alternately arranged with the segment members. When the segment members are fastened to the rotor frame with two bolts, The magnetic members are squeezed between the sloping side edges of the pole members and the sloping portions of the side edges of the segment members. The segment members, the permanent magnet members and the pole members form a closed loop around the outer surface of the rotor frame, and the electric machine is contained within A plurality of such rings in succession in the axial direction. In addition, there is at least one axial air passage through the rings and at least one radial air passage between the rings.
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