| 摘要 |
A rotor assembly comprises a rotor core 16 that is rotatable about a rotation axis, the rotor core comprising a stack of laminations 22, each lamination extending perpendicular to the rotation axis, the stack being arranged to receive one or more adhesive coated permanent magnets 18 and comprising a central bore 54 extending in a direction substantially parallel to the rotation axis, wherein the bore defines an inner surface 52 of the rotor core, and neighbouring laminations in the stack are joined at said inner surface by weld 58. As an alternative to a weld, a suitable element such as a caulking element may be used. End plates 24 having iron inserts 68 engage the outer laminations of the stack and moveable shunts 26 allow the radial field of the rotor to be diverted axially when applied against the end plates at high speed/low torque conditions of the electric machine so as to effect field weakening. A core assembly method is described. |
