Magnetic levitation device and magnetic levitation rotary table

Abstract

The present invention provides a magnetic levitation device and a magnetic levitation rotary table. The magnetic levitation device includes a stator comprising a permanent magnet device and a first levitation control unit, and a rotor, wherein the first levitation control unit comprises a first control unit and a second control unit, the first control unit being arranged to impart an axially upward levitation force to the rotor, and the second control unit being arranged to impart an axially downward levitation force to the rotor, the first control unit comprising a plurality of first stator poles, and the second control unit comprising a plurality of second stator poles, the permanent magnet device comprising a plurality of permanent magnet units, the plurality of permanent magnet units being uniformly arranged in the circumferential direction and generating the same or substantially the same magnetic flux in the first air gap of two radially symmetric first stator poles of each pair or in the first air gap of each first stator pole, and generating the same or substantially the same magnetic flux in the second air gap of two radially symmetric second stator poles of each pair or in the second air gap of each second stator pole. The present invention can improve the rotational stability of a magnetic levitation rotary table.

Claims

1. A magnetic levitation device comprising a stator (1) having a permanent magnet device (11) and a first levitation control unit (12), and a rotor (2), wherein the first levitation control unit includes a first control unit (121) and a second control unit (122) arranged in a staggered manner along the axial direction, the first control unit being arranged to impart an upward axial levitation force to the rotor, and the second control unit being arranged to impart a downward axial levitation force to the rotor, The first control unit includes a plurality of first stator magnetic poles (1211) uniformly arranged in the circumferential direction, and the second control unit includes a plurality of second stator magnetic poles (1221) uniformly arranged in the circumferential direction. The permanent magnet device includes a plurality of permanent magnet units (111), the plurality of permanent magnet units are uniformly arranged in the circumferential direction, and generate the same or substantially the same magnetic flux in the first air gap of two radially symmetric first stator poles of each pair or in the first air gap of each first stator pole, and generate the same or substantially the same magnetic flux in the second air gap of two radially symmetric second stator poles or in the second air gap of each second stator pole. A magnetic levitation device characterized by the following features.

2. The number of the multiple first stator poles, the number of the multiple second stator poles, and the number of the multiple permanent magnet units are all two or more, or the number of the multiple first stator poles, the number of the multiple second stator poles, and the number of the multiple permanent magnet units are the same and none of them are even. The magnetic levitation device according to feature 1.

3. The number of the plurality of first stator poles and the number of the plurality of second stator poles are the same and both are even. The magnetic levitation device according to feature 2.

4. In the circumferential direction, one second stator pole is provided between adjacent first stator poles, and one first stator pole is provided between adjacent second stator poles. The magnetic levitation device according to feature 3.

5. The number of the plurality of first stator magnetic poles, the number of the plurality of second stator magnetic poles, and the number of the plurality of permanent magnet units are all four. In the circumferential direction, the position of each permanent magnet unit is one-to-one opposite to the position of the first stator pole, or in the circumferential direction, the position of each permanent magnet unit is one-to-one opposite to the position of the second stator pole, or in the circumferential direction, each permanent magnet unit is provided at equal intervals between adjacent first and second stator poles. The magnetic levitation device according to feature 4.

6. The number of the plurality of first stator magnetic poles and the number of the plurality of second stator magnetic poles are both four, and the number of the plurality of permanent magnet units is eight. In the circumferential direction, the position of each permanent magnet unit is one-to-one opposite to the position of the first stator pole and one-to-one opposite to the position of the second stator pole, or, in the circumferential direction, each permanent magnet unit is provided at equal intervals between adjacent first and second stator poles. The magnetic levitation device according to feature 4.

7. The number of the plurality of first stator magnetic poles and the plurality of second stator magnetic poles is eight, and the number of the plurality of permanent magnet units is four. In the circumferential direction, the position of each permanent magnet unit is one-to-one opposite to the position of the first stator pole, or in the circumferential direction, the position of each permanent magnet unit is one-to-one opposite to the position of the second stator pole, or in the circumferential direction, each permanent magnet unit is provided at equal intervals between adjacent first and second stator poles. The magnetic levitation device according to feature 4.

8. Each of the first stator poles is provided corresponding to one second stator pole, and at least a portion of them overlaps in the axial direction. The magnetic levitation device according to feature 3.

9. The stator further includes a second levitation control unit (13) arranged to impart a radial levitation force to the rotor, the second levitation control unit including a plurality of third stator magnetic poles (131) uniformly arranged in the circumferential direction, The plurality of permanent magnet units are sandwiched between the first levitation control unit and the second levitation control unit, and generate the same or substantially the same magnetic flux in the third air gap of two radially symmetric third stator poles or in the third air gap of each third stator pole. A magnetic levitation device according to any one of claims 1 to 8.

10. The number of the multiple third stator magnetic poles and the number of the multiple permanent magnet units are both four. In the circumferential direction, the position of each permanent magnet unit is directly opposite to the position of the third stator pole, or, in the circumferential direction, each permanent magnet unit is positioned at equal intervals between adjacent third stator poles. The magnetic levitation device according to feature 9.

11. A first electromagnetic winding (1212) is provided on the first stator pole, a second electromagnetic winding (1222) is provided on the second stator pole, and a third electromagnetic winding (132) is provided on the third stator pole. The magnetic levitation device according to feature 10.

12. Multiple motor slots (134) are formed on the rotor-facing side of each third stator pole, motor teeth (135) are formed between two adjacent motor slots, and motor slits (133) are formed between adjacent third stator poles, with each motor slit being arranged as a single motor slot. The magnetic levitation device according to feature 11.

13. The rotor includes a rotor body (21) and a first annular edge (22) and a second annular edge extending from the rotor body to the stator. A first air gap is formed between the first stator pole and the first annular edge, a second air gap is formed between the second stator pole and the first annular edge, a portion of the second annular edge is cut off at equal intervals to form a plurality of rotor poles (23), and a third air gap is formed between the rotor pole and the third stator pole. The magnetic levitation device according to feature 9.

14. The number of rotor poles is an even number of two or more, or the number of rotor poles and the number of third stator poles are the same and neither is even. The magnetic levitation device according to feature 13.

15. The rotor has eight magnetic poles, and the third stator has four magnetic poles. The magnetic levitation device according to feature 14.

16. The first control unit further includes an annular first magnetic conduction piece (1210), and the plurality of first stator magnetic poles are formed on the first magnetic conduction piece and protrude toward the rotor. The second control unit further includes an annular second magnetic conduction piece (1220), and the plurality of second stator magnetic poles are formed on the second magnetic conduction piece and protrude toward the rotor. The second levitation control unit further includes an annular third magnetic conduction piece (130), and the plurality of third stator magnetic poles are formed on the third magnetic conduction piece and protrude toward the rotor. The third magnetic conductive piece, the permanent magnet unit, the first magnetic conductive piece, and the second magnetic conductive piece are stacked in this order along the axial direction. The magnetic levitation device according to feature 9.

17. The permanent magnet unit includes a permanent magnet (1111) magnetized in at least one axial direction. The magnetic levitation device according to feature 16.

18. Each permanent magnet unit includes multiple permanent magnets (1111) arranged in the same radial plane, with the distance between adjacent permanent magnets being the same or approximately the same. The plurality of permanent magnets are arranged in a straight line in the radial plane, and the line connecting the center of the permanent magnet unit and the projection point of the rotor's rotation axis in the radial plane is perpendicular or substantially perpendicular to the straight line. The magnetic levitation device according to feature 16.

19. Each permanent magnet unit includes a plurality of permanent magnets arranged in the same radial plane, the distance between adjacent permanent magnets is the same or approximately the same, the plurality of permanent magnets are arranged in an arc shape in the radial plane, and the distance between each permanent magnet and the projection point of the rotor's rotation axis in the radial plane is the same or approximately the same. The magnetic levitation device according to feature 16.

20. In the circumferential direction, the distance between the outermost permanent magnets of adjacent permanent magnet units is the same as or approximately the same as the distance between adjacent permanent magnets of those permanent magnet units. The magnetic levitation device according to feature 19.

21. The permanent magnet unit includes a support block (1112), the support block having a fixing groove (1113) corresponding to each permanent magnet, and the permanent magnets are positioned within the corresponding fixing grooves. The magnetic levitation device according to feature 17.

22. The stator further includes a plurality of first pressing plates (14) and a plurality of second pressing plates (15), wherein the first pressing plates are provided on the outside of the third magnetic conduction piece, the second pressing plates are provided on the outside of the second magnetic conduction piece, and the first pressing plates and the second pressing plates are fastened together by fasteners. The magnetic levitation device according to feature 16.

23. The device comprises a mounting body (3) and a magnetic levitation device according to any one of claims 1 to 22, wherein the rotor supports and positions the mounting body via several support columns (4). A magnetic levitation rotary table characterized by the following features.

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