Permanent magnet dynamoelectric machine

Claim 2

A dynamoelectric machine comprising a stator and a rotor, said stator including a plastic cup-shaped housing, means for rotatably supporting said rotor within said plastic cup-shaped housing, a plurality of high flux, low coercive force permanent magnets, at least two ferromagnetic flux path members, means for holding said permanent magnets and said ferromagnetic flux path members in assembled relationship in said stator, plastic material of said cup-shaped housing interposed between said rotor and said permanent magnets whereby the gap between said permanent magnets and said rotor is optimized to prevent the de-magnetizing effect from the rotor from overcoming the permanent magnets coercive force.

Claim 3

The combination of claim 1 in which said permanent magnets are of flat block configuration.

Claim 4

The combination of claim 2 in which the exterior of said plastic cup-shaped housing has arcuate surfaces, said plastic cup-shaped housing having means for locating said permanent magnets in line contact with said arcuate surfaces, each of said ferromagnetic flux path members having a pair of flat end portions, one of said flat end portions being positioned in engagement with one surface of said flat block permanent magnets whereby complete contact is assured between said one surface of said flat block permanent magnets and the associated end portion of said ferromagnetic flux path members.

Claim 5

The combination of claim 1 in which said means for holding said permanent magnets and said ferromagnetic flux path members in assembled relationship comprises the plastic material of said cup-sHaped housing.

Claim 6

The combination of claim 4 in which the plastic material of said cup-shaped housing is molded about said permanent magnets and said ferromagnetic flux path members.

Claim 7

The combination of claim 5 in which said permanent magnets are of a flat block configuration.

Claim 8

A dynamoelectric machine comprising an armature, a cup-shaped housing formed of non-magnetic material and having a substantially cylindrical inner surface portion, and means for rotatably supporting said armature within said substantially cylindrical inner surface of said cup-shaped housing, a plurality of high flux, low coercive force permanent magnets, at least two ferromagnetic flux path members and means for holding said permanent magnets and said ferromagnetic flux path members in assembled relationship exteriorly of said substantially cylindrical inner surface of said cup-shaped housing, non-magnetic material of said cup-shaped housing positioned between said permanent magnets and said armature to form an optimum gap whereby the de-magnetizing force produced by the armature will not overcome the coercive force of the permanent magnets.

Claim 9

A dynamoelectric machine comprising an armature, a cup-shaped housing formed of non-magnetic material and having a substantially cylindrical inner surface portion, and means for rotatably supporting said armature within said substantially cylindrical inner surface of said cup-shaped housing, a plurality of high flux, low coercive force permanent magnets, at least two ferromagnetic flux path members and means for holding said permanent magnets and said ferromagnetic flux path members in assembled relationship exteriorly of said substantially cylindrical inner surface of said cup-shaped housing, non-magnetic material of said cup-shaped housing positioned between said permanent magnets and said armature to form an optimum gap whereby the de-magnetizing force produced by the armature will not overcome the coercive force of the permanent magnets.

Claim 10

The combination of claim 7 in which the non-magnetic material of said cup-shaped housing is molded about said permanent magnets and said ferromagnetic flux path members to form said means for holding said permanent magnets and said ferromagnetic flux path members in assembled relationship.

Claim 11

The combination of claim 7 in which the exterior of said cup-shaped housing has arcuate surfaces, said cup-shaped housing having means for locating one surface of each of said permanent magnets in line contact with one of said arcuate surfaces, each of said ferromagnetic flux path members having a pair of flat end portions, each of said flat end portions being positioned in engagement with a flat surface of one of said permanent magnets.

Claim 12

A stator for a dynamoelectric machine comprising a cup-shaped housing having a plurality of curved exterior surfaces and constructed of a non-magnetic material, a plurality of flat permanent magnets supported by said housing curved surfaces in spaced relationship about the periphery of said housing, and at least two magnetic flux return path members each having a pair of flat end portions, each of said magnetic flux return path members being supported by said housing with said flat end portions in engagement with two of said flat permanent magnets, said cup-shaped housing having non-magnetic material positioned radially inwardly of said permanent magnets cooperating with the magnetic flux return path member to maintain a line contact between the curved surfaces and one side of the flat permanent magnets to provide intimate planar contact between the other sides of the flat permanent magnets and the flat end portions of the magnetic flux return path members.

Claim 13

A stator for a dynamoelectric machine comprising a cup-shaped housing having a plurality of curved exterior surfaces and constructed of a non-magnetic material, a plurality of flat permanent magnets supported by said housing curved surfaces in spaced relationship about the periphery of said housing, and at least two magnetic flux return path members each having a pair of flat end portions, each of said magnetic flux return path members being supported by said housing with said flat end portions in engagement with two of said flat permanent magnets, said cup-shaped housing having non-magnetic material positioned radially inwardly of said permanent magnets cooperating with the magnetic flux return path member to maintain a line contact between the curved surfaces and one side of the flat permanent magnets to provide intimate planar contact between the other sides of the flat permanent magnets and the flat end portions of the magnetic flux return path members.