| 摘要 |
An electric machine ( 10 ) has a disk-shaped rotor ( 24 ) disposed in an operating space between two opposing stator assemblies ( 11, 12 ) to provide two axial air gaps ( 15, 16 ). The rotor ( 24 ) has a hub ( 28 ) and an outer ring ( 26 ) of non-magnetic material and is further provided with a plurality of permanent magnetic elements ( 25 ) for coupling flux that is induced by the magnetic field of the stator assemblies ( 11, 12 ). The permanent magnetic elements ( 25 ) are spaced apart and reluctance poles ( 27 ) are positioned in spaces between the magnetic elements ( 25 ) to couple additional flux induced by the magnetic field of the stator assemblies ( 11, 12 ). Various constructions and shapes ( 40 - 45 ) for the PM magnetic elements ( 25 ) are disclosed, and including PM covers ( 60 ) of ferromagnetic material for enhancing q-axis flux in the air gaps ( 15, 16 ) and for reducing harmonics where toothed stators are used. Methods of providing increased torque using the the various rotor constructions are also disclosed.
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