A rotor for an electric motor

摘要

The rotor comprises a hub 18 having a central axis, a plurality of rotor segments 2 and permanent magnets 12, retained by lips 8. The segments 2 are arranged around the hub to define at least two rings, which are adjacent to each other in the axial direction with a permanent magnet disposed between each of the segments in each ring. The assembly includes a plurality of rods (40 Fig 5) which extend in an axial direction to retain the rotor segments, with an intermediate plate (30 Fig 4) located between each ring of segments through which the rods pass. The rods are secures in/pass though cavities 26 in the end plates and pass though bores (4 Fig 1) in each stator segment. The magnets are supported in grooves 28 and may be bonded in position. The rods may be in the form of bolts threaded into the cavities 26or into nuts at the outer side of the end plate. Grooves 14 encourage air turbulence assisting cooling.