| 摘要 |
An axial flux generator has facing rotor annuli 12,13 carrying permanent magnets 15,14 with an intermediate stator annulus carrying coils, the magnets of each rotor facing each other with opposite polarities such that flux passes between the rotors though the stator coils, permanent magnet interpoles 22 being present between adjacent magnets of each rotor. The interpole field is arranged radially with a polarity such that it is the same as the polarity of the adjacent main magnet. The sides of the magnets facing the interpoles may be curved (convex or concave), the pole faces of the interpoles 22 being oppositely curved to as to nestle into the magnets 14,15. The interpole may comprise a stack of laterally conjoined magnets (fig 8 not shown) or a two piece axial stack where the interpole is magnetised such that, at an edge facing the adjacent permanent magnet, the edge of the piece furthest from the air cap is of opposite polarity to the edge of the piece closest to the air gap (fig 6 not shown).Fig 4 shows the resultant flux paths in relation to permanent magnets 36-41 and interpoles 42-47 for facing rotors. Ferromagnetic elements may be inserted between magnet groups. |
