Structure for post-assembly magnetization of a permanent magnet rotor, field keyed to a rotating shaft

摘要

An un-magnetized permanent magnet rotor that can be magnetized without regard to the angular position of the rotor in the magnetizing fixture and will have the resulting permanent magnetic field synchronized to a mechanically keyed shaft comprises an annular permanent magnet or annular permanent magnet rotor body; a mechanically keyed rotor shaft; and means for aligning the un-magnetized permanent magnet or permanent magnet rotor body and the mechanically keyed rotor shaft during assembly. The rotor shaft contains means for aligning to the magnet or magnet rotor body, which, in turn contains means for coupling to the alignment means of the keyed shaft. The permanent magnet or magnet rotor body and rotor shaft are permanently assembled and then magnetized.