| 摘要 |
An axial flux rotary generator comprises a coaxial assembly of two magnetic annuli 11,13, which are magnetically uncoupled, embracing a coil annulus 12 having coils 19, the two magnetic annuli comprising pluralities of circumferentially arranged magnets defining a plurality of magnetic fields around the common axis extending across a gap between the two magnetic annuli cutting the coils. The relative positioning of individual magnetic fields and a relative positioning of centres and sizing of individual coils in the sequence of coils is such that the electric currents in the individual coils of the sequence of coils are in excess of three phases relative to one another which reduces the cogging effect, preferably achieved by the pitch of the coils being different to the pitch of the magnets eg the pitch between the centre of the coils d being marginally greater than the pitch M of the magnets. Preferably the number of coils are odd whilst the number of magnets are even. Each phase is rectified and the output combined on bus bars and in a multi-stator assembly coil sets occupying the same angular position will have the same phase and are interconnected prior to rectification (see fig 10 not shown). |
