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1. (US20100231085) Pole retention configuration for electric machine rotors
Nota: Texto obtenido mediante procedimiento automático de reconocimiento óptico de caracteres.
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Claims

1. A rotor retention system, comprising:
a rotor hub having a plurality of axially extending channels configured to receive therein complementarily shaped portions of pole pieces and effective to retain the pole pieces therein against centrifugal forces;
a plurality of axially extending clamp members configured with lateral extensions which engage under pole-hub gaps between the pole pieces and the rotor hub, the clamp members also configured to contain therein complementarily shaped permanent magnets; and
for each permanent magnet, a pair of axially extending wedge-shaped base members configured to fit between the permanent magnet and the rotor hub, the wedge-shaped base members tapered to have inclined surfaces which engage against each other in sliding fashion, the wedge-shaped base members expanding laterally as thicker portions of the tapers abut and creating lateral forces that force the lateral extensions of the respective clamp member into the pole-hub gaps of adjacent pole pieces.
2. The rotor retention system of claim 1, wherein the wedge-shaped base members are substantially trapezoidal in shape with the engaging surfaces skewed along the axial dimension of the machine.
3. The rotor retention system of claim 1, wherein the wedge-shaped base members are non-magnetic.
4. The rotor retention system of claim 1, wherein the clamp members are ferromagnetic.
5. The rotor retention system of claim 1, wherein the axially extending channels in the rotor hub are substantially T-shaped in cross section.
6. The rotor retention system of claim 1, wherein edges of the lateral extensions of the clamp members are tapered.
7. The rotor retention system of claim 1, wherein the clamp members are substantially U-shaped in cross section.
8. The rotor retention system according to claim 1, further comprising a curable fluid within gaps between the permanent magnets and their respective clamp members.
9. The rotor retention system according to claim 8, wherein the curable fluid is sufficiently flexible when cured so as to be effective to protect the permanent magnets against mechanical damage.
10. The rotor retention system of claim 1, wherein the rotor hub is made of a nonmagnetic material selected from the group consisting of stainless steel, high grade aluminum and composite materials.
11. The rotor retention assembly of claim 1 further comprising said pole pieces, said pole pieces being relatively highly permeable to magnetic fields.
12. The rotor retention assembly of claim 11, wherein said pole pieces comprise ferromagnetic laminations.
13. The rotor retention assembly of claim 1 further comprising said permanent magnets, each permanent magnet comprising a magnetic material selected from the group consisting of ferrite, NdFeB, ceramic and Samarium-Cobalt.
14. A rotor assembly, comprising:
a shaft;
a rotor hub on the shaft;
a plurality of pole pieces;
a plurality of axially extending channels in the hub configured to receive therein complementarily shaped portions of the pole pieces and effective to retain the pole pieces therein against centrifugal forces;
a plurality of axially extending clamp members configured with lateral extensions which engage under pole-hub gaps between the pole pieces and the rotor hub;
a plurality of permanent magnets complementarily shaped to fit within the clamp members and retained therein; and
for each permanent magnet, a pair of axially extending wedge-shaped base members configured to fit between the permanent magnet and the rotor hub, the wedge-shaped base members tapered to have inclined surfaces which engage against each other in sliding fashion, the wedge-shaped base members expanding laterally as thicker portions of the tapers abut and creating lateral forces that force the lateral extensions of the respective clamp member into the pole-hub gaps of adjacent pole pieces.
15. The rotor assembly of claim 14, wherein the pole pieces comprise ferromagnetic laminations.
16. The rotor assembly of claim 14, wherein each permanent magnet comprises a magnetic material selected from the group consisting of ferrite, NdFeB, ceramic and Samarium-Cobalt.
17. The rotor assembly of claim 14, wherein the rotor hub is made of a nonmagnetic material selected from the group consisting of stainless steel, high grade aluminum and composite materials.
18. The rotor assembly of claim 14 wherein the base wedge-shaped members are trapezoidal in shape.
19. The rotor assembly of claim 14, wherein the base wedge-shaped members are triangular in shape.
20. An electric machine, comprising:
a shaft;
a rotor hub on the shaft;
a plurality of pole pieces;
a plurality of axially extending channels in the hub configured to receive therein complementarily shaped portions of the pole pieces and effective to retain the pole pieces therein against centrifugal forces;
a plurality of axially extending clamp members configured with lateral extensions which engage under pole-hub gaps between the pole pieces and the rotor hub;
a plurality of permanent magnets complementarily shaped to fit within the clamp members and retained therein; and
for each permanent magnet, a pair of axially extending wedge-shaped base members configured to fit between the permanent magnet and the rotor hub, the wedge-shaped base members tapered to have inclined surfaces which engage against each other in sliding fashion, the wedge-shaped base members expanding laterally as thicker portions of the tapers abut and creating lateral forces that force the lateral extensions of the respective clamp member into the pole-hub gaps of adjacent pole pieces.
21. The electric machine of claim 20, wherein the pole pieces comprise ferromagnetic laminations.
22. The electric machine of claim 20, wherein each permanent magnet comprises a magnetic material selected from the group consisting of ferrite, NdFeB, ceramic and Samarium-Cobalt.
23. The electric machine of claim 20, wherein the rotor hub is made of a nonmagnetic material selected from the group consisting of stainless steel, high grade aluminum and composite materials.
24. The electric machine of claim 20, wherein the base wedge-shaped members are trapezoidal in shape.
25. The electric machine of claim 20, wherein the base wedge-shaped members are triangular in shape.
26. The electric machine of claim 20, wherein the electric machine is a generator.
27. The electric machine of claim 20, wherein the electric machine is a motor.
28. The electric machine of claim 20, wherein the rotor hub is irremovably secured to the shaft.
29. The electric machine of claim 19, further comprising a curable resin disposed in gaps between the permanent magnets and the clamp members.