Halbach-array levitating passive magnetic bearing configuration
View Patent ↗Novel configurations of levitating passive magnetic bearing configurations are described. Such configurations can be used for the precise control of the magnitude and sign of the bearing stiffness, thereby facilitating the overall design of the system in ways that are not possible with conventional attractive or repelling bearing elements.
1. An apparatus, comprising:
a rotor;
a first primary array comprising a first annular Halbach array attached to said rotor;
a support structure configured to be stationary with respect to said rotor;
a second primary array comprising a second annular Halbach array attached to said support structure, wherein said first primary array and said second primary array are configured to interact magnetically one with another to provide a levitation force to said rotor;
a first secondary array comprising a third annular Halbach array attached to said rotor;
a second secondary array comprising a fourth annular Halbach array attached to said support structure, wherein said first secondary array and said second secondary array are configured to interact magnetically one with another to provide a force that is opposite to said levitation force to said rotor; and
a first adjustable means for attaching said second secondary array to said support structure.
2. The apparatus of claim 1 , wherein said first adjustable means can be adjusted to move said second secondary array to change the distance between said first secondary array and said secondary array to adjust said force that is opposite to said levitation force.
3. The apparatus of claim 1 , further comprising an extra primary array comprising a fifth annular Halbach array configured to augment said levitation force, wherein said extra primary array is attached to said support structure.
4. The apparatus of claim 3 , further comprising a second adjustable means for attaching said extra primary array to said support structure.
5. The apparatus of claim 4 , wherein said second adjustable means can be adjusted to move said extra primary array to change the distance between said extra primary array and said second primary array to adjust said levitation force.
6. The apparatus of claim 1 , wherein said first primary array is attached to the upper side of said rotor, wherein said first primary array and said second primary array are magnetically attracting one to another.
7. The apparatus of claim 6 , wherein said first secondary array and said second secondary array are magnetically repelling one to another.
8. The apparatus of claim 3 , wherein said first primary array is attached to the upper side of said rotor, wherein said first primary array and said second primary array are magnetically attracting one to another, wherein said first secondary array and said second secondary array are magnetically repelling one to another, wherein said extra primary array is magnetically attracting to said second primary array.
9. The apparatus of claim 1 , wherein said third annular Halbach array and said fourth annular Halbach array have a shorter wavelength than that of said first annular Halbach array and said second annular Halbach array.
10. The apparatus of claim 9 , wherein the lower face of said fourth annular Halbach array is displaced from the face of said third annular Halbach array.
11. The apparatus of claim 3 , wherein said fifth annular Halbach array has a shorter wavelength that that of said first annular Halbach array and said second first annular Halbach array.
12. The apparatus of claim 1 , wherein said first primary array is attached to the bottom side of said rotor, wherein said first primary array and said second primary array are magnetically repelling one to another.
13. The apparatus of claim 12 , wherein said first secondary array and said second secondary array are magnetically attracting one to another.
14. The apparatus of claim 3 , wherein said first primary array is attached to the bottom side of said rotor, wherein said first primary array and said second primary array are magnetically repelling one to another, wherein said first secondary array and said second secondary array are magnetically attracting one to another, wherein said extra primary array is magnetically attracting to said second primary array.
15. The apparatus of claim 1 , wherein said first primary array and said second primary array comprise a first radii and wherein said first secondary array and said second secondary array comprise a second radii, wherein said first radii and said second radii are different.
16. The apparatus of claim 15 , wherein said first primary array and said second primary array are coplanar.
17. The apparatus of claim 1 , wherein said first primary array and said second primary array comprise a first radii and wherein said first secondary array and said second secondary array comprise a second radii, wherein said first radii and said second radii are the same or comparable and are coaxial.
18. The apparatus of claim 17 , wherein said first primary array and said second primary array are coaxial.
19. A method, comprising:
providing a rotor;
providing a first primary array comprising a first annular Halbach array attached to said rotor;
providing a support structure configured to be stationary with respect to said rotor;
providing a second primary array comprising a second annular Halbach array attached to said support structure, wherein said first primary array and said second primary array are configured to interact magnetically one with another to provide a levitation force to said rotor;
providing a first secondary array comprising a third annular Halbach array attached to said rotor;
providing a second secondary array comprising a fourth annular Halbach array attached to said support structure, wherein said first secondary array and said second secondary array are configured to interact magnetically one with another to provide a force that is opposite to said levitation force to said rotor;
providing a first adjustable means for attaching said second secondary array to said support structure; and
rotating said rotor.
20. The method of claim 19 , wherein said first adjustable means can be adjusted to move said second secondary array to change the distance between said first secondary array and said secondary array to adjust said force that is opposite to said levitation force, said method further comprising adjusting said first adjustable means to move said second secondary array to change the distance between said first secondary array and said secondary array to adjust said force that is opposite to said levitation force.
21. The method of claim 19 , further comprising providing an extra primary array comprising a fifth annular Halbach array configured to augment said levitation force, wherein said extra primary array is attached to said support structure, further comprising providing a second adjustable means for attaching said extra primary array to said support structure, wherein said second adjustable means can be adjusted to move said extra primary array to change the distance between said extra primary array and said second primary array to adjust said levitation force, said method further comprising adjusting said second adjustable means to move said extra primary array to change the distance between said extra primary array and said second primary array to adjust said levitation force.
22. The method of claim 19 , wherein said first primary array is attached to the upper side of said rotor, wherein said first primary array and said second primary array are magnetically attracting one to another, wherein said first secondary array and said second secondary array are magnetically repelling one to another.
23. The method of claim 21 , wherein said first primary array is attached to the upper side of said rotor, wherein said first primary array and said second primary array are magnetically attracting one to another, wherein said first secondary array and said second secondary array are magnetically repelling one to another, wherein said extra primary array is magnetically attracting to said second primary array.
24. The method of claim 19 , wherein said third annular Halbach array and said fourth annular Halbach array have a shorter wavelength than that of said first annular Halbach array and said second annular Halbach array.
25. The method of claim 24 , wherein the lower face of said fourth annular Halbach array is displaced from the face of said third annular Halbach array.
26. The method of claim 21 , wherein said fifth annular Halbach array has a shorter wavelength that that of said first annular Halbach array and said second first annular Halbach array.
27. The method of claim 19 , wherein said first primary array is attached to the bottom side of said rotor, wherein said first primary array and said second primary array are magnetically repelling one to another, wherein said first secondary array and said second secondary array are magnetically attracting one to another.
28. The method of claim 21 , wherein said first primary array is attached to the bottom side of said rotor, wherein said first primary array and said second primary array are magnetically repelling one to another, wherein said first secondary array and said second secondary array are magnetically attracting one to another, wherein said extra primary array is magnetically attracting to said second primary array.
29. The method of claim 19 , wherein said first primary array and said second primary array comprise a first radii and wherein said first secondary array and said second secondary array comprise a second radii, wherein said first radii and said second radii are different.
30. The method of claim 29 , wherein said first primary array and said second primary array are coplanar.
31. The method of claim 19 , wherein said first primary array and said second primary array comprise a first radii and wherein said first secondary array and said second secondary array comprise a second radii, wherein said first radii and said second radii are the same or comparable and are coaxial.
32. The method of claim 31 , wherein said first primary array and said second primary array are coaxial.