| 摘要 |
<p>A brushless, permanent magnet dynamo-electric machine (50) has a stator assembly (52) and a rotor assembly (RA). The rotor assembly includes a rotor mounted on a rotor shaft (60). The stator assembly has a plurality of inwardly salient poles (52,see Fig.3) and the rotor has a plurality of outwardly salient poles (RP). The rotor is comprised of a plurality of stacked rotor laminations (L) defining the rotor poles, and there is an air gap (G1,see Fig.6B) between the rotor and stator poles. The improved rotor assembly (56) of the present invention controls the available flux coupled between the rotor and stator assemblies. A coil (70, and look at Fig.6B) is supported on a magnetic mounting structure (66) which is connected to an endwall (W,see Fig.6B) of the motor housing and fits the coil over the rotor shaft (60). D.C. current is supplied to the coil (70). A plurality of magnets (82a,82b) extend the length of the lamination stack and the magnets are positioned adjacent an outer face of one pole for each set of rotor poles. The magnets are mounted on support structure (83,see Fig.5) that extends about the coil (70). The magnets magnetically attach to the outer surface of the rotor poles to suspend the structure about the shaft. An air gap (G2,see Fig.6B) extends between the coil (70) and shaft (60). The magnets rotate in synchronism with the rotor. The current supplied to the coil controls the flux coupled to the rotor, and the mounting structures for the coil and magnets partially define a diversion flux path for the resultant flux. There are three airgaps (G1,G2,G3,see Fig.6B). <IMAGE></p> |
