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A permanent magnet rotor having a unitary aluminum casting surrounding magnets mounted on the shaft which has favorable heat transfer, performance, and cost characteristics, and which may be constructed by the accompanying method. Spacers and rings surrounding the permanent magnets are eliminated by

A permanent magnet rotor having a unitary aluminum casting surrounding magnets mounted on the shaft which has favorable heat transfer, performance, and cost characteristics, and which may be constructed by the accompanying method. Spacers and rings surrounding the permanent magnets are eliminated by the aluminum casting. Pockets for the permanent magnets are cast into the aluminum. A non-magnetic outer sleeve overlies the shaft, magnets and aluminum layer.

대표청구항 ▼

A permanent magnet rotor, comprising: a shaft of magnetizable material; a layer of non-magnetizable material formed around the periphery of said shaft, said layer having a first plurality of apertures therein disposed circumferentially about said rotor with each of said apertures extending radially

A permanent magnet rotor, comprising: a shaft of magnetizable material; a layer of non-magnetizable material formed around the periphery of said shaft, said layer having a first plurality of apertures therein disposed circumferentially about said rotor with each of said apertures extending radially inwardly through said layer to said shaft; a first plurality of rare earth permanent magnets, each of said magnets fitting into one of said apertures in a manner whereby the sides of each of said magnets are surrounded by said layer, said layer thereby acting as a heat sink for said magnets; a sleeve of non-magnetizable material installed over said magnets and the portion of said layer surrounding said magnets.