Spoke permanent magnet machine with reduced torque ripple and method of manufacturing thereof

摘要

An internal permanent magnet machine 10 includes a rotor assembly 12 having a shaft 18 comprising a plurality of protrusions 22 extending radially outward from a main shaft body 24 and being formed circumferentially about the main shaft body 24 and along an axial length of the main shaft body 24. A plurality of stacks of laminations 30 are arranged circumferentially about the shaft to receive the plurality of protrusions 22 therein, with each stack of laminations 30 including a plurality of lamination groups arranged axially along a length of the shaft and with permanent magnets 34 being disposed between the stacks of laminations 30. Each of the laminations 30 includes a shaft protrusion cut formed therein to receive a respective shaft protrusion 22 and, for each of the stacks of laminations 30, the shaft protrusion cuts formed in the laminations of a respective lamination group are angularly offset from the shaft protrusion cuts formed in the laminations in an adjacent lamination group.