Permanent magnet stator for dynamoelectric machines and method of assembling the same

Claim 1

A STATOR FOR A DYNAMOELECTRIC MACHINE COMPRISING AN ARCUATELY CURVED IN CROSS-SECTION PERMANENT MAGNET HAVING AN OUTER CURVED FACE, AN INNER CURVED FACE ADAPTED TO BE ARRANGED ADJACENT THE SURFACE OF A ROTOR, AND OPPOSITE END PORTIONS ALIGNED COPLANAR WITH SAID INNER CURVED FACE; A PAIR OF END RINGS ADAPTED TO BE ARRANGED AXIALLY CONCENTRIC WITH THE AXIS OF THE ROTOR WITH THE MAGNET ARRANGED BETWEEN THE RINGS; A LONGITUDINALLY SPLIT CASING FORMED OF A MAGNETICALLY PERMEABLE MATERIAL AND FORMED OF A SIZE TO ENCIRCLE THE MAGNETIC AND ROTOR; EACH OF SAID RINGS HAVING AN INNER GROOVE FORMED TO RECEIVE AN END PORTION OF SAID MAGNETIC AND AN OUTER GROOVE FORMED TO RECEIVE AN END PORTION OF SAID CASING, WITH THE INNER WALL OF THE INNER GROOVE BEING ACCURATELY SPACED RELATIVE TO THE AXIS OF THE ROTOR TO FORM A POSITIONING SHOULDER FOR ACCURATELY POSITIONING THE INNER FACE OF THE MAGNETIC RELATIVE TO THE ROTOR FOR PROVIDING A PREDETERMINED, ACCURATE AIR GAP THEREBETWEEN; THE CASING BEING RADIALLY INWARDLY MOVABLE WITHIN ITS GROOVES TO TIGHTLY CONTACT THE MAGNETIC OUTER FACE AND THEREBY FORCE THE MAGNET END PORTIONS RADIALLY INWARDLY AND TIGHTLY AGAINST SAID POSITIONING SHOULDERS; AND MEANS FOR FIXING THE CASING RELATIVE TO THE RINGS FOR FIXING THE MAGNETIC END PORTIONS AGAINST SAID POSITIONING SHOULDERS.