Permanent magnet field structure for dynamoelectric machines
AssigneeCanadian General Electric Company Limited
InventorEric Whiteley
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Abstract
A dynamoelectric machine has a stator and a discoidal rotor with an axial air gap between them. The machine has a permanent magnet field structure wherein each flux-producing component comprises a mosaic of at least one layer of two or more unit permanent magnets per layer.
Claims12
A discoidal type dynamoelectric machine comprising at least two relatively rotatable members separated by an axial gap;
- means defining at least one closed magnetic flux path included in said members and said gap;
- an electric winding linked electromagnetically with said path;
- and a mosaic of at least one layer of two or more unit permanent magnets per layer mounted on one of said relatively rotatable members and located in said path for producing magnetic flux therein oriented axially in said gap.
A dynamoelectric machine comprising a stator having an annular magnetic yoke defining one gap surface of an axial air gap machine;
- a winding linked electromagnetically with said annular yoke;
- a rotor having a magnetic yoke spaced axially from said gap surface;
- an annular array of complementary permanent magnet pole structures on the yoke of said rotor adjacent said gap surface;
- each one of said pole structures comprising a plurality of unit permanent magnets having flat parallel faces and of face outline suitable for edge-to-edge arrangement in a mosaic like pattern;
- and means for securing said mosaic of unit magnets to said rotor yoke with one flat face of each unit against a flat surface on the rotor yoke, said unit magnets having the magnetic orientation thereof in the same polarity sense and having the same physical dimension in the direction of orientation whereby the other flat faces of the unit magnets present a flat pole face facing said gap surface on the stator core but spaced axially therefrom.
A dynamoelectric machine comprising a pair of disc-shaped rotors supported for rotation on the same axis in axially spaced relation, each one of said rotors having a magnetic yoke;
- a stator;
- an annular pancake winding located between said rotor yokes transversely of said axis and supported by said stator;
- an annular array of an equal number of complementary permanent magnet pole structures on each rotor yoke located adjacent said winding;
- each one of said pole structures comprising a plurality of unit permanent magnets having flat parallel faces and of face outline, suitable for edge-to-edge arrangement in a mosaic like pattern;
- and means for securing said mosaic of unit magnets to said rotor yoke with one flat face of each unit against a flat surface on the rotor yoke, said unit magnets having the magnetic orientation thereof in the same polarity sense and having the same physical dimension in the direction of orientation whereby the other flat faces of the unit magnets present a flat pole face facing said winding but spaced axially therefrom.
Dependencies are inferred from the claim text.