Rotor assembly for permanent magnet generator

Claim 2

A rotor assembly comprising: an annular member consisting essentially of cobalt and at least one rare earth metal in alloy form, said member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft extending through said axial bore, said shaft comprised of a ferromagnetic material, and mounted for rotational movement with said annular member; and a continuous layer of inert material having a melting point above the sintering temperature of said cobalt alloy, said layer disposed between the wall of said bore and said shaft to provide a barrier between said cobalt rare earth alloy and said ferromagnetic material, said annular member, said shaft and said layer forming an integral rotor assembly.

Claim 3

A rotor assembly as recited in claim 1 wherein the shaft is comprised of a ferromagnetic material and said inert material selected from the group consisting of aluminum oxide or zirconium oxide.

Claim 4

A rotor assembly comprising: an annular member consisting essentially of a samarium cobalt alloy, said member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft extending through said axial bore, said shaft comprised of a ferromagnetic material and mounted for rotational movement with said annulur member; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, said layer disposed between the wall of said bore and said shaft to provide a barrier between said annular member and said shaft, said annular member, said shaft and said layer forming an integral rotor assembly.

Claim 5

A rotor assembly comprising: an annular member consisting essentially of a samarium cobalt alloy, said member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft extending through said axial bore, said shaft comprised of a ferromagnetic material and mounted for rotational movement with said annulur member; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, said layer disposed between the wall of said bore and said shaft to provide a barrier between said annular member and said shaft, said annular member, said shaft and said layer forming an integral rotor assembly.

Claim 6

A rotor assembly as recited in claim 3 wherein the shaft is comprised of a ferromagnetic material.

Claim 7

A rotor assembly comprising: an annular member consisting essentially of cobalt and at least one rare earth metal, said member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft; a hub mounted on said shaft and extending into said axial bore, said hub comprised of a ferromagnetic material; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, disposed on the surface of said hub to provide a barrier between said ferromagnetic material of said hub and said cobalt rare earth alloy material of said annular member, said annular member, said shaft, said hub and said layer forming an integral rotor assembly.

Claim 8

A rotor assembly comprising: an annular member consisting essentially of cobalt and at least one rare earth metal, said member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft; a hub mounted on said shaft and extending into said axial bore, said hub comprised of a ferromagnetic material; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, disposed on the surface of said hub to provide a barrier between said ferromagnetic material of said hub and said cobalt rare earth alloy material of said annular member, said annular member, said shaft, said hub and said layer forming an integral rotor assembly.

Claim 9

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries of the stator and the rotor, the improved rotor which comprises: a rotor shaft; a flux carrier ring comprised of a ferromagnetic material telescoped over said shaft; a layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, disposed on the outside surface of said flux carrier ring; a ring-shaped permanent magnet over said flux carrier ring, said magnet being formed of sintered material consisting essentially of cobalt alloyed with at least one rare earth metal, and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjacent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; means for securing flux carrier ring to said rotor shaft; and a metallic sleeve embracing the peripheral surface of said magnet in said air gap.

Claim 10

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries of the stator and the rotor, the improved rotor which comprises: a rotor shaft; a flux carrier ring comprised of a ferromagnetic material telescoped over said shaft; a layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, disposed on the outside surface of said flux carrier ring; a ring-shaped permanent magnet over said flux carrier ring, said magnet being formed of sintered material consisting essentially of cobalt alloyed with at least one rare earth metal, and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjacent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; means for securing flux carrier ring to said rotor shaft; and a metallic sleeve embracing the peripheral surface of said magnet in said air gap.

Claim 11

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries of the stator and the rotor, the improved rotor which comprises: a rotor shaft; a magnetic flux carrier ring telescoped over said shaft; a layer of ceramic material disposed on the outside surface of said flux carrier ring; a ring-shaped permanent magnet over said flux carrier ring, said magnet being formed of a single section of a pressed and sintered rare earth cobalt alloy and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjacent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; and means for securing said flux carrier ring to said rotor shaft.

Claim 12

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries of the stator and the rotor, the improved rotor which comprises: a rotor shaft; a magnetic flux carrier ring telescoped over said shaft; a layer of ceramic material disposed on the outside surface of said flux carrier ring; a ring-shaped permanent magnet over said flux carrier ring, said magnet being formed of a single section of a pressed and sintered rare earth cobalt alloy and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjacent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; and means for securing said flux carrier ring to said rotor shaft.

Claim 13

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries in the stator and the rotor, the improved rotor which comprises: a rotor shaft; a magnetic flux carrier ring of ferromagnetic material telescoped over said shaft; a layer of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, disposed between said flux conducting ring and said magnet; a ring-shaped permanent magnet telescoped over said flux carrier ring, said magnet being formed of sintered material consisting essentially of cobalt and at least one rare earth metal and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjcent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; means for securing said flux carrier ring to said rotor shaft; and a metallic sleeve embracing the perIpheral surface of said magnet in said air gap.

Claim 14

In a rotary electrical apparatus having a stator and a rotor with a radial air gap between the adjacent peripheries in the stator and the rotor, the improved rotor which comprises: a rotor shaft; a magnetic flux carrier ring of ferromagnetic material telescoped over said shaft; a layer of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, disposed between said flux conducting ring and said magnet; a ring-shaped permanent magnet telescoped over said flux carrier ring, said magnet being formed of sintered material consisting essentially of cobalt and at least one rare earth metal and having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface and a plurality of second magnetic poles at its radially inner surface adjcent said flux carrier ring, said second poles being generally radially aligned with respective first poles and of opposite polarity therefrom; means for securing said flux carrier ring to said rotor shaft; and a metallic sleeve embracing the perIpheral surface of said magnet in said air gap.

Claim 15

A rotor construction comprising: a cylindrical member of permanent magnet material having an axial bore therethrough, said member comprised of cobalt and at least one rare earth metal, said magnet member having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface; a shaft comprised of ferromagnetic material, said shaft extending through said axial bore in said magnet member; a coating of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, on the surface of said shaft; and means for securing said shaft to said cylindrical member to form an integral rotor assembly.

Claim 16

A rotor construction comprising: a cylindrical member of permanent magnet material having an axial bore therethrough, said member comprised of cobalt and at least one rare earth metal, said magnet member having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface; a shaft comprised of ferromagnetic material, said shaft extending through said axial bore in said magnet member; a coating of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide, on the surface of said shaft; and means for securing said shaft to said cylindrical member to form an integral rotor assembly.

Claim 17

A rotor construction comprising: a cylindrical member of permanent magnet material having an axial bore therethrough, said member comprised of cobalt and at least one rare earth metal, said magnet member having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface; a shaft comprised of a ferromagnetic material, said shaft extending through said axial bore in said magnet member; a coating of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide on the surface of said shaft; means for securing said shaft to said magnetic member to form an integral rotor assembly, and a nonmagnetic sleeve surrounding the outer peripheral surface of the cylindrical member.

Claim 18

A rotor construction comprising: a cylindrical member of permanent magnet material having an axial bore therethrough, said member comprised of cobalt and at least one rare earth metal, said magnet member having a plurality of equally spaced first magnetic poles of alternating polarity at its radially outer surface; a shaft comprised of a ferromagnetic material, said shaft extending through said axial bore in said magnet member; a coating of material selected from the group consisting of zirconium oxide, magnesium oxide, and aluminum oxide on the surface of said shaft; means for securing said shaft to said magnetic member to form an integral rotor assembly, and a nonmagnetic sleeve surrounding the outer peripheral surface of the cylindrical member.

Claim 19

A rotor assebly comprising: an annular member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft extending through said axial bore, said shaft comprised of a ferromagnetic material, and mounted for rotational movement with said annular member; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, said layer disposed between the wall of said bore and said shaft to provide a barrier between said cobalt alloy and said flux conducting material, said annular member, said shaft and said layer forming an integral rotor assembly.

Claim 20

A rotor assebly comprising: an annular member having sections magnetized about the periphery thereof alternately in opposite polarity, said annular member having an axial bore extending therethrough; a shaft extending through said axial bore, said shaft comprised of a ferromagnetic material, and mounted for rotational movement with said annular member; and a continuous layer of material selected from the group consisting of zirconium oxide, magnesium oxide, berylium oxide, titanium oxide, and aluminum oxide, said layer disposed between the wall of said bore and said shaft to provide a barrier between said cobalt alloy and said flux conducting material, said annular member, said shaft and said layer forming an integral rotor assembly.