Pole-piece structure for a magnetic gear

A magnetic gear assembly, comprising:

• a rotating pole-piece structure comprising a longitudinal axis and a plurality of laminate plates, wherein each of said laminate plates is a ring formed from a single piece of material comprising one or more apertures and an aperture in each plate aligns with an aperture in an adjacent plate to form one or more channels extending from a first axial end of the laminate plates to a second, opposite axial end of the laminate plates;
• a first rotating component;
• a second rotating component;
• a plurality of inner permanent magnets;
• and
• a plurality of outer permanent magnets located concentrically with respect to said inner permanent magnets;
• wherein said pole-piece structure is located radially between said inner and outer permanent magnets and modulates the magnetic fields produced by said inner and outer permanent magnets, and the pole-piece structure is located axially between the first and second rotating components of the magnetic gear assembly;
• wherein a solid, substantially non-magnetic material is provided throughout each channel to hold the plurality of laminate-plates together;
• wherein the solid, substantially non-magnetic material comprises cavities at each first and second axial end, and each of the first and second rotating components comprise flanges that extend into the cavities, so as to hold the pole-piece structure in position
• wherein the non-magnetic material comprises a resin that is provided throughout each channel, wherein the resin completely fills each channel.