Electric motor field magnets

Claim 2

An electric motor having a compound field magnet with a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement and comprise flexible layers that have permanently magnetized particles which are embedded in a matrix of flexible material and ferromagnetic metal layers respectively interposed between said flexible layers, each of said flexible layers having a thickness dimension which is less than about one-fourth of an inch, and said metal layers having a higher permeability than said flexible layers.

Claim 3

An electric motor in accord with claim 1 where each of said flexible layers has opposite edges and the embedded particles in each flexible layer are polarized to provide a polar axis that extends between the opposite edges thereof and in a pole complementing arrangement with respect to the other flexible layers of the compound field magnet.

Claim 4

An electric motor in accord with claim 1 where each of said flexible layers has opposite faces and the embedded particles in each flexible layer are polarized to provide a polar axis that extends between the opposite faces thereof and in a pole complementing arrangement with respect to the other flexible layers of the compound field magnet.

Claim 5

An electric motor in accord with claim 1 where said particles are barium ferrite.

Claim 6

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin, flat layers which are assembled in a face-to-face arrangement in respective parallel planes that are parallel to said axis, said flat layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated structure.

Claim 7

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin, flat layers which are assembled in a face-to-face arrangement in respective parallel planes that are parallel to said axis, said flat layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated structure.

Claim 8

The electric motor in accord with claim 5 wherein said flixible matrix containing material comprises particulate barium ferrite.

Claim 9

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective planes that intersect along and are radially oriented with respect to said axis, said thin layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated magnetic structure.

Claim 10

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective planes that intersect along and are radially oriented with respect to said axis, said thin layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated magnetic structure.

Claim 11

The electric motor in accord with claim 7 wherein said flexible matrix containing material comprises particulate barium ferrite.

Claim 12

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective parallel planes that are normal to said axis, said thin layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated magnetic structure.

Claim 13

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective parallel planes that are normal to said axis, said thin layers comprising ferromagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flexible layers having opposite edges and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles respectively at said opposite edges, said armature and field magnet having an air gap therebetween, said flexible layers being so oriented that edges having like magnetic poles are located at said air gap, and each of said metal layers having an edge which is located at said air gap and which is offset toward the armature from the edges of the flexible layers next adjacent thereto in the laminated magnetic structure.

Claim 14

The electric motor in accord with claim 9 wherein said flexible matrix containing material comprises particulate barium ferrite.

Claim 15

An electric motor having an armature which is rotatable about an axis, a pole piece radially offset from said axis having a pole face and opposite sides radially outwardly of said pole face, and a pair of compound magnets which are spaced apart and respectively located at said opposite sides of said pole piece, each of said magnets having a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective planes that intersect along and are radially oriented with respect to said axis, said thin layers comprising flexible layers which are spaced apart, and ferromagnetic metal layers which are interposed and located in the respective spaces between said flexible layers, each of said thin layers having opposite edges and the opposite edges of the metal layers being offset inwardly in the laminated structure from the opposite edges of the flexible layers next adjacent thereto, each of said flexible layers having opposite faces and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles that are respectively located at said opposite faces, and the flexible layers in each of the laminated magnetic structures being so oriented that the faces having like poles generally face the ones of said opposite sides of the pole piece that are adjacent thereto.

Claim 16

An electric motor having an armature which is rotatable about an axis, a pole piece radially offset from said axis having a pole face and opposite sides radially outwardly of said pole face, and a pair of compound magnets which are spaced apart and respectively located at said opposite sides of said pole piece, each of said magnets having a laminated structure that includes thin layers which are assembled in a face-to-face arrangement in respective planes that intersect along and are radially oriented with respect to said axis, said thin layers comprising flexible layers which are spaced apart, and ferromagnetic metal layers which are interposed and located in the respective spaces between said flexible layers, each of said thin layers having opposite edges and the opposite edges of the metal layers being offset inwardly in the laminated structure from the opposite edges of the flexible layers next adjacent thereto, each of said flexible layers having opposite faces and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles that are respectively located at said opposite faces, and the flexible layers in each of the laminated magnetic structures being so oriented that the faces having like poles generally face the ones of said opposite sides of the pole piece that are adjacent thereto.

Claim 17

The electric motor in accord with claim 11 wherein said flexible matrix containing material comprises particulate barium ferrite.

Claim 18

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin, flat layers which are arcuately arranged with respect to said axis and assembled in a face-to-face arrangement, said flat layers comprising paramagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flat layers having edges and the edges of the metal layers being offset inwardly in the laminated structure from the edges of the flexible layers next adjacent thereto, each of said flexible layers having opposite faces and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles that are respectively located at said opposite faces, said flexible layers being so oriented that faces having like poles face in the same radial direction in the laminated structure.

Claim 19

An electric motor having an armature which is rotatable about an axis, and a compound field magnet which is radially offset from the axis and has a permanent magnetic field, said magnet being a laminated structure that includes thin, flat layers which are arcuately arranged with respect to said axis and assembled in a face-to-face arrangement, said flat layers comprising paramagnetic metal layers which are spaced apart, and flexible layers which are interposed and located in the respective spaces between said metal layers, each of said flat layers having edges and the edges of the metal layers being offset inwardly in the laminated structure from the edges of the flexible layers next adjacent thereto, each of said flexible layers having opposite faces and a flexible matrix containing material which is permanently magnetized to provide opposite magnetic poles that are respectively located at said opposite faces, said flexible layers being so oriented that faces having like poles face in the same radial direction in the laminated structure.

Claim 20

The electric motor in accord with claim 13 wherein said flexible matrix containing material comprises particulate barium ferrite.

Claim 21

An electric motor having a compound field magnet with a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement and comprise flexible layers, and ferromagnetic metal layers respectively interposed between said flexible layers, each of said flexible layers having opposite edges and a matrix of flexible material containing embedded permanently magnetized particles that are polarized to provide a polar axis which extends between said opposite edges and in a pole complementing arrangement with respect to the other flexible layers of the compound field magnet, each of said metal layers having an edge which is outwardly offset from the edges of the flexible layers next adjacent thereto in the laminated structure by a distance ranging from about seventy-five percent to one hundred twenty-five percent of the thickness of the respective flexible layers next adjacent thereto, each of said flexible layers having a thickness dimension which is less than about one-fourth of an inch, and each of said metal layers having a permeability which is higher than that of the flexible layers.

Claim 22

An electric motor having a compound field magnet with a permanent magnetic field, said magnet being a laminated structure that includes thin layers which are assembled in a face-to-face arrangement and comprise flexible layers, and ferromagnetic metal layers respectively interposed between said flexible layers, each of said flexible layers having opposite edges and a matrix of flexible material containing embedded permanently magnetized particles that are polarized to provide a polar axis which extends between said opposite edges and in a pole complementing arrangement with respect to the other flexible layers of the compound field magnet, each of said metal layers having an edge which is outwardly offset from the edges of the flexible layers next adjacent thereto in the laminated structure by a distance ranging from about seventy-five percent to one hundred twenty-five percent of the thickness of the respective flexible layers next adjacent thereto, each of said flexible layers having a thickness dimension which is less than about one-fourth of an inch, and each of said metal layers having a permeability which is higher than that of the flexible layers.