CN110261803B - Halbach assembly - Google Patents
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- CN110261803B CN110261803B CN201910650067.2A CN201910650067A CN110261803B CN 110261803 B CN110261803 B CN 110261803B CN 201910650067 A CN201910650067 A CN 201910650067A CN 110261803 B CN110261803 B CN 110261803B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 125
- 239000010959 steel Substances 0.000 claims abstract description 125
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000005415 magnetization Effects 0.000 claims abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000012545 processing Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000005481 NMR spectroscopy Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003041 laboratory chemical Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000447 pesticide residue Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/383—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using permanent magnets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/389—Field stabilisation, e.g. by field measurements and control means or indirectly by current stabilisation
Abstract
The halbach assembly comprises a plurality of single rings, inner sleeve steel rings, end cover plates and screws, wherein the outer diameters and structures of the single rings are the same, adjacent single rings are horizontally rotated for 180 DEG to be stacked, each single ring comprises a magnetic group, an outer sleeve aluminum ring sleeved on the outer side of the magnetic group and a positioning pin, the magnetic group is formed by arranging 2m magnetic steels circumferentially according to a halbach permanent magnet array, the magnetic steels are circumferentially spliced to form a circular ring, and the side surfaces of the magnetic steels are bonded; the magnetization direction is S to N, the magnetization directions of two pieces of magnetic steel positioned on the first axis are the same, two poles are formed, the magnetization direction is N-level magnetic steel outwards from the center direction, the other piece of magnetic steel is S-level magnetic steel, the magnetization directions of the rest magnetic steels are mirror symmetry relative to the first axis, and the included angle between the magnetization direction of the magnetic steel and the magnetization direction of the N-level magnetic steel in the clockwise direction of the first axis is sequentially increased by 360/m degrees; the invention designs special magnetic steel arrangement and magnetization arrangement direction, reduces cost, meets high performance requirements, reduces volume and processing difficulty, and can be used in the field of high-precision detection.
Description
Technical Field
The invention relates to the field of magnetic products, in particular to a halbach assembly.
Background
Halbach arrays are engineered magnet structures that approximate an ideal structure by which the strongest magnetic field can be generated with the smallest possible number of magnets; the halbach assembly manufactured by the principle can be applied to high-precision detection needing to build a high-intensity magnetic field in a certain range, such as magnetic resonance substance detection; compared with nuclear magnetic equipment for high-end laboratories and nuclear magnetic equipment for medical treatment, the nuclear magnetic resonance spectrometer tends to be civil low-cost, miniaturized and convenient, requires a halbach component with smaller volume while meeting the requirement of use, has complex processing technology and larger volume, can not form a uniform and stable stronger magnetic field in a certain space, keeps a lower fluctuation value, often fluctuates by more than 100 gauss, and can not meet the requirement of high-precision detection.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a halbach assembly which is convenient to assemble and process and improves the strength and stability of a magnetic field.
The technical scheme adopted for solving the technical problems is as follows: the halbach assembly comprises a plurality of single rings, inner sleeve steel rings, end cover plates and screws, wherein the outer diameter and the structure of each single ring are the same, adjacent single rings are horizontally rotated for 180 degrees to be stacked, each single ring comprises a magnetic group, an outer sleeve aluminum ring sleeved on the outer side of the magnetic group and a positioning pin, the magnetic groups are formed by arranging 2m magnetic steels circumferentially according to halbach permanent magnet arrays, m is an integer, the magnetic steels of the same single ring are columnar bodies with the cross sections of two right-angle sides clamped with a section of circular arc, the magnetic steels are circumferentially spliced to form a circular ring, and the magnetic steel side surfaces are bonded and spliced; the outer sleeve aluminum ring is of a circular ring structure, positioning holes are symmetrically formed in one diameter direction of the outer sleeve aluminum ring, and the positioning holes are through holes; the connecting line of the circle centers of the two positioning holes is a central axis, the diameter direction of the central axis rotating 30 degrees clockwise around the circle center is a first axis, the inner walls of the two sides of the outer sleeve aluminum ring which are in mirror symmetry along the first axis are symmetrically provided with first semicircular pin holes, two pieces of magnetic steel in the perpendicular direction of the first axis in the magnetic group are matched and provided with second semicircular pin holes, and the two semicircular pin holes are spliced into a whole circle to form the positioning pin holes; a positioning pin with the same height as that of the single outer sleeve aluminum ring is inserted into the positioning pin hole; countersunk threaded holes and threaded small holes are respectively formed in two ends of the first axis of the outer sleeve aluminum ring, three countersunk threaded holes and three threaded small holes are formed in each outer sleeve aluminum ring, and the countersunk threaded holes and the threaded small holes are circumferentially distributed at intervals along the outer sleeve aluminum ring by 120 degrees;
the magnetization direction is S to N, the magnetization directions of two magnetic steels positioned on the first axis are the same, two poles are formed, wherein the magnetization direction is N-level magnetic steel outwards from the circle center direction, the other magnetic steel is S-level magnetic steel, the magnetization directions of the rest magnetic steels are mirror symmetry relative to the first axis, and the included angle between the magnetization direction of the magnetic steel and the magnetization direction of the N-level magnetic steel in the clockwise direction of the first axis is sequentially increased by 360/m degrees; the inner sleeve steel ring is inserted into the inner side of the single ring, the end cover plates are of ring structures arranged at two ends of the single ring, and three mounting holes for inserting screws are uniformly distributed at intervals in the circumferential direction of the ring; the screws are inserted into corresponding hole sites and screwed and fixed.
Further, the number of the single rings is five, the sizes of the single rings are the same, and each single magnetic group comprises twelve pieces of magnetic steel; according to the sequence from the near to the far in the clockwise direction of the N-level magnetic steel, the included angle between the magnetization direction and the magnetization direction of the N-level magnetic steel is increased by 60 degrees in sequence.
Further, the length of the inner sleeve steel ring is longer than the sum of the heights of the single rings and is smaller than the sum of the heights of the single rings and the two end cover plates; the inner wall of the end cover plate is provided with a clamping groove matched with the length of the inner sleeve steel ring.
Further, the number of the single rings is even, the single rings comprise an end single ring and a middle single ring, and the sizes of the rest single rings are the same except for the first end single ring and the second end single ring; the end part single ring comprises a first magnetic group, a first outer sleeve aluminum ring and a positioning pin, wherein the first magnetic group is formed by encircling first magnetic steel; the middle single ring comprises a second magnetic group, a second outer sleeve aluminum ring and a positioning pin, and the second magnetic group is formed by encircling second magnetic steel; the wall thickness of the first outer sleeve aluminum ring is smaller than that of the second outer sleeve aluminum ring, and the thickness of the first magnetic steel is larger than that of the second magnetic steel.
Further, the number of single rings is six.
Further, the inner diameter of the first magnetic group is smaller than that of the second magnetic group, a thin-wall shielding iron ring is arranged at the inner side of the middle single ring, the height of the shielding iron ring is the same as the total height of the middle single ring, and the shielding iron ring is arranged at the outer side of the inner sleeve steel ring.
Further, the inner diameter of the first magnetic group is 0.2 mm smaller than that of the second magnetic group, and the wall thickness of the shielding iron ring is 0.1 mm.
Further, the inner sleeve steel ring is made of stainless steel, and the magnetic steel is N45M magnetic steel.
Further, the outer aluminum ring is made of 6061 aluminum alloy.
Compared with the prior art, the halbach component designs special magnetic steel arrangement and magnetization arrangement directions by applying the principle of the annular halbach array, saves cost, meets high performance requirements, greatly reduces the volume and can be used in portable instruments; the whole halbach assembly is cylindrical, the arrangement of the magnetic steels of each layer of single ring is the same, the shape is simple, the processing difficulty is low, the installation and the operation are simple and convenient, and the cost can be saved; the multi-ring superposition technology meets the magnetic field height required by the product, reduces the magnetic steel production difficulty, can superpose and strengthen the magnetic field intensity, optimizes the assembly structure, increases the size of the magnetic groups with single rings at the front end and the tail end, and can better ensure the uniformity and stability of the magnetic field intensity in a specific range; the method can be applied to the detection of nuclear magnetic resonance spectrometer substances and can also be applied to other high-precision detection fields.
Drawings
Fig. 1 is a schematic perspective view of embodiment 1 of the present invention.
Fig. 2 is an exploded view of embodiment 1 of the present invention.
Fig. 3 is an exploded view of a single ring according to example 1 of the present invention.
Fig. 4 is a top view of a single ring and a schematic diagram of magnetization direction of magnetic steel according to embodiment 1 of the present invention.
FIG. 5 is a cross-sectional view taken along the direction A-A of example 1 of the present invention.
Fig. 6 is an exploded view of embodiment 2 of the present invention.
Fig. 7 is a top view of a single ring and a schematic diagram of magnetization direction of magnetic steel according to embodiment 2 of the present invention.
FIG. 8 is a cross-sectional view taken along the direction A-A of example 2 of the present invention.
Reference numerals:
1-a single ring; 11-magnetic group; 111-magnetic steel; 112-a second semicircular pin hole; 113-N grade magnetic steel; 114-S grade magnetic steel; 12-coating an aluminum ring; 121-positioning holes; 122-central axis; 123-a first axis; 124-a first semicircular pin hole; 125-countersunk threaded holes; 126-threaded small holes; 13-locating pins; 14-locating pin holes;
2-inner sleeve steel rings; 3-end cover plates; 31-mounting holes; 32-clamping grooves; 4-screws;
5-terminal single rings; 51-a first magnetic group; 511-a first magnetic steel; 52-a first outer aluminum collar;
6-an intermediate single ring; 61-a second magnetic group; 611-a second magnetic steel; 62-a second outer aluminum sheath;
7-shielding iron rings;
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
Example 1
As shown in fig. 1 to 5, the halbach assembly comprises a plurality of single rings 1, an inner sleeve steel ring 2, end cover plates 3 and screws 4 for fixing, wherein the single rings 1 are identical in structure and size, the adjacent single rings 1 are horizontally rotated for 180 degrees to be stacked, the inner sleeve steel ring 2 is inserted into the single rings 1 during installation, the end cover plates 3 are additionally arranged at the two ends of the stacked plurality of single rings 1, and the screws 4 are inserted into corresponding holes to be fastened and screwed in the installation process to realize fixation.
Each single ring 1 comprises an annular magnetic group 11, an outer aluminum sleeve ring 12 sleeved on the outer side of the magnetic group 11 and a positioning pin 13, the magnetic group 11 is formed by arranging a plurality of magnetic steels 111 circumferentially according to a halbach permanent magnet array, each magnetic steel 111 is identical in shape and size, each magnetic steel 111 is a columnar body with a cross section of two right-angle sides sandwiching a section of circular arc, the magnetic steels 111 are circumferentially spliced to form a circular ring, and the side surfaces of the magnetic steels 111 are bonded and spliced to ensure the determination of the relative positions of the magnetic steels; in the embodiment, five single rings 1 are shared, and each single magnetic group 11 comprises twelve magnetic steels 111; the outer sleeve aluminum ring 12 is of a circular ring structure, wherein a positioning hole 121 is symmetrically formed in one diameter direction, the positioning hole 121 is a through hole and is used for inserting a positioning rod in the assembly process so as to ensure that single rings 1 are overlapped in the vertical direction, a connecting line of the circle centers of the two positioning holes 121 is regarded as a central axis 122, the central axis 122 rotates clockwise around the circle center for 30 degrees, the diameter direction is a first axis 123, first semicircular pin holes 124 are symmetrically formed in the inner walls of the two sides of the outer sleeve aluminum ring 12, which are in mirror symmetry along the first axis 123, of the magnetic group 11, second semicircular pin holes 112 are symmetrically formed in the two magnetic steels 111 in the vertical direction of the first axis 123, the two semicircular pin holes are spliced into complete circles to form positioning pin holes 14, positioning pins 13 are inserted in the process of splicing the single rings 1 so as to ensure that the relative positions of each outer sleeve aluminum ring 12 and the magnetic group 11 are fixed, and the positioning pins 13 are cylinders with the same height as the single outer sleeve aluminum ring 12; countersunk threaded holes 125 and threaded small holes 126 are respectively formed in two ends of the first axis 123 of the outer sleeve aluminum ring 12, three countersunk threaded holes 125 and three threaded small holes 126 are respectively formed in each outer sleeve aluminum ring 12, and the countersunk threaded holes 125 and the threaded small holes 126 are distributed at intervals of 120 degrees along the circumferential direction of the outer sleeve aluminum ring 12.
As shown by the arrow in fig. 4, the arrow points to N, and represents the magnetization direction, in this embodiment, the magnetization arrangement direction of each magnetic steel 111 in the magnetic group 11 is that the magnetization directions of two magnetic steels 111 located on the first axis 123 are the same, so as to form two poles, wherein the magnetization direction is N-level magnetic steel 113 outwards from the center direction, the other magnetic steel 114 is S-level magnetic steel, the magnetization directions of the other magnetic steels 111 are mirror symmetry with respect to the first axis 123, taking half-circle magnetic steel 111 in the clockwise direction of the first axis 123 as an example, according to the order from near to far with N-level magnetic steel 113, the included angle between the magnetization direction and the perpendicular direction is increased by 60 ° in sequence, that is, the included angle between the magnetization direction and the N-level magnetic steel 113 is increased by 60 ° in sequence, and this arrangement can basically ensure the uniformity of magnetic field to the greatest extent, and the functions of all the other magnetic steels 111 except for forming two poles are auxiliary enhancement magnetic fields; further, 2m pieces of magnetic steel 111 are shared in the magnetic group 11, m is an integer, the magnetization direction is N-level magnetic steel 113 outwards from the center direction, and according to the sequence from the near to the far of the N-level magnetic steel 113 clockwise, the included angle between the magnetization direction and the vertical direction is sequentially increased by 360/m degrees, so that two poles are formed, and the magnetic steel 111 on two sides of the two poles are used for assisting the arrangement pattern of reinforcement.
In addition, the inner sleeve steel ring 2 is made of stainless steel, the length of the inner sleeve steel ring 2 is slightly longer than the sum of the heights of the single rings 1 and is smaller than the added height of the single rings 1 and the two end cover plates 3, and the inner sleeve steel ring 2 can protect the inner side magnetic steel 111; the end cover plate 3 is of a circular ring structure, and three mounting holes 31 are circumferentially distributed at intervals of 120 degrees in the circular ring and are used for inserting screws 4; the clamping groove 32 which is matched with the inner sleeve steel ring 2 in length is formed in the inner wall of the end cover plate 3 and is used for being matched with the inner sleeve steel ring 2 to achieve clamping, the relative position of the inner structure is guaranteed to be stable after the screws 4 are screwed, and meanwhile, the end cover plate 3 can also play a role in protection.
The magnetic steel 111 adopts N45M magnetic steel, and can meet the accuracy of the instrument in a high-temperature environment by utilizing the high-temperature resistance of the magnetic steel, and the application of the permanent magnet facilitates the later maintenance of the instrument; the outer aluminum ring 12 is made of 6061 aluminum alloy, and is firm and durable and has excellent performance.
The whole halbach assembly process is as follows: firstly, magnetizing each magnetic steel 111 according to the designed magnetization direction, assembling each single ring 1, matching two magnetic steels 111 provided with second semicircular pin holes 112 with the first semicircular pin holes 124 of the outer sleeve aluminum ring 12, inserting a positioning pin 13 to assist in positioning, sequentially placing the rest magnetic steels 111, and bonding the joints; in the process, as the adjacent single rings 1 are horizontally rotated for 180 degrees to ensure that the hole positions of the screws 4 are matched with each other, the magnetic steels 111 of the adjacent single rings 1 are horizontally rotated for 180 degrees to be installed so as to ensure that the magnetization directions of the magnetic groups 11 of all the single rings 1 are consistent; then, inserting the positioning rod for auxiliary positioning into the positioning hole 121 of one single ring 1, inserting an inner sleeve steel sleeve, horizontally rotating the second single ring 1 by 180 degrees along the central axis 122, sleeving, inserting a countersunk screw 4 into the countersunk threaded hole 125, and screwing and fixing; the rest single rings 1 are sleeved in sequence according to the steps, the positioning rod is pulled out, and then end cover plates 3 are arranged on the outer sides of the single rings 1 at the two ends and are screwed and fixed by screws 4. The assembly sequence can be fine-tuned to complete the assembly structure as a final result.
Example 2
As shown in fig. 6 to 8, the present embodiment is different from embodiment 1 in that six single rings 1 are present in the present embodiment, the single rings 1 include an end single ring 5 and a middle single ring 6, the outer diameter and the structure of each single ring 1 are still the same, and the four single rings 1 are the same in size except for the first and second end single rings 5; the end part single ring 5 comprises a first magnetic group 51, a first outer sleeve aluminum ring 52 and a positioning pin 13, wherein the first magnetic group 51 is formed by encircling a first magnetic steel 511; the middle single ring 6 comprises a second magnetic group 61, a second outer aluminum ring 62 and a positioning pin 13, and the second magnetic group 61 is formed by encircling second magnetic steel 611; the wall thickness of the first outer aluminum sheath 52 is smaller than that of the second outer aluminum sheath 62, and the thickness of the first magnetic steel 511 is larger than that of the second magnetic steel 611, because when the number of single rings 1 is larger, the outer diameters of the magnetic steels 111 of the two single rings 1 need to be increased so as to ensure the stability of the central magnetic field.
In addition, the inner diameter of the first magnetic group 51 is slightly smaller than that of the second magnetic group 61, in this embodiment, the inner diameter of the first magnetic group 51 is 0.2 mm smaller than that of the second magnetic group 61, a thin-walled shielding iron ring 7 is installed at the inner side of the middle single ring 6, the height of the shielding iron ring 7 is the same as the total height of the middle single ring 6, in this embodiment, the shielding iron ring 7 is specifically a circular cylindrical structure with a wall thickness of 0.1 mm, the main function is to stabilize a magnetic field, the magnetic field is ensured to be uniform, the shielding iron ring 7 is located at the outer side of the inner sleeve steel ring 2, and the inner diameter difference between the first magnetic group 51 and the second magnetic group 61 can effectively fix the position of the shielding iron ring 7.
In addition, the single magnetic group 11 still includes twelve pieces of magnetic steel 111, and the magnetization direction is the same as that of embodiment 1; the whole assembly installation process is the same as that of the embodiment 1, wherein the step of clamping the shielding iron ring 7 is added when the middle single ring 6 is stacked.
The invention designs the special magnetic steel 111 arrangement and magnetization arrangement direction by applying the principle of the annular halbach array, the arrangement can basically ensure the magnetic field uniformity to the greatest extent, reduce the cost and meet the high performance requirement, simultaneously greatly reduce the volume, can be used on portable instruments, and can promote the development of the civil high-precision detection field; the whole halbach assembly is cylindrical, the magnetic steels 111 of each layer of single ring 1 are identical in arrangement, simple in shape and low in processing difficulty, the structural limit of the magnetic group 11 can eliminate accumulated errors during assembly, the installation operation is simple and convenient, and the cost can be saved; the multi-ring superposition technology meets the magnetic field height required by the product, reduces the production difficulty of the magnetic steel 111, can superpose and strengthen the magnetic field intensity by the multi-section magnetic steel 111, optimizes the assembly structure in the embodiment 2, increases the size of the magnetic group 11 of the single ring 1 at the front end and the tail end, and can better ensure the uniformity and stability of the magnetic field intensity in a specific range by arranging the shielding iron ring 7; the method is mainly applied to the detection of nuclear magnetic resonance spectrometer substances, and can also be applied to other high-precision detection fields, such as scientific research laboratory chemical molecular characteristic analysis, mixture analysis, solid material analysis and biological analysis; petroleum and petrochemical in the industrial field; drug synthesis in the field of medicine and drug intermediate structure identification; agricultural high-precision pesticide residue detection and the like, and has a plurality of application scenes, so that the method is very practical; meanwhile, the invention utilizes N45M magnetic steel, has high temperature resistance and high performance, and can meet the accuracy of the instrument in a high-temperature environment.
Finally, it should be noted that: the above embodiments are merely illustrative of the technical solution of the present invention, and not limiting thereof; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. Halbach subassembly, its characterized in that: the magnetic steel structure comprises a plurality of single rings (1), inner sleeve steel rings (2), end cover plates (3) and screws (4), wherein the outer diameter and the structure of each single ring (1) are the same, adjacent single rings (1) are horizontally rotated for 180 DEG to be stacked, each single ring (1) comprises a magnetic group (11), an outer sleeve aluminum ring (12) sleeved on the outer side of the magnetic group (11) and a positioning pin (13), the magnetic group (11) is formed by arranging 2m magnetic steels (111) circumferentially according to a halbach permanent magnet array, m is an integer, the magnetic steels (111) of the same single ring (1) are the same in shape and size, the cross sections are columnar bodies with one section of circular arc clamped between two right-angle sides, the magnetic steels (111) are circumferentially spliced to form a circular ring, and the side surfaces of the magnetic steels (111) are bonded and spliced; the outer sleeve aluminum ring (12) is of a circular ring structure, positioning holes (121) are symmetrically formed in one diameter direction, and the positioning holes (121) are through holes; the connecting line of the circle centers of the two positioning holes (121) is a central axis (122), the central axis (122) rotates 30 degrees clockwise around the circle center in the diameter direction as a first axis (123), first semicircular pin holes (124) are symmetrically formed in the inner walls of the two sides of the outer sleeve aluminum ring (12) which are in mirror symmetry along the first axis (123), second semicircular pin holes (112) are formed in the magnetic group (11) in a matched mode in the direction perpendicular to the first axis (123), and the two semicircular pin holes are spliced into a whole circle to form the positioning pin holes (14); a positioning pin (13) with the same height as the single outer sleeve aluminum ring (12) is inserted into the positioning pin hole (14); countersunk threaded holes (125) and threaded small holes (126) are respectively formed in two ends of a first axis (123) of the outer sleeve aluminum ring (12), three countersunk threaded holes (125) and three threaded small holes (126) are formed in each outer sleeve aluminum ring (12), and the countersunk threaded holes (125) and the threaded small holes (126) are distributed at intervals of 120 degrees along the circumferential direction of the outer sleeve aluminum ring (12);
the magnetization direction is S points to N, the magnetization directions of two magnetic steels (111) positioned on the first axis (123) are the same, two poles are formed, wherein the magnetization direction is N-level magnetic steel (113) outwards from the circle center direction, the other block is S-level magnetic steel (114), the magnetization directions of the rest magnetic steels (111) are mirror symmetry relative to the first axis (123), and the included angles between the magnetization directions of the magnetic steels (111) and the N-level magnetic steel (113) in the clockwise direction of the first axis (123) are sequentially increased by 360/m degrees; the inner sleeve steel ring (2) is inserted into the inner side of the single ring (1), the end cover plates (3) are of ring structures arranged at two ends of the single ring (1), and three mounting holes (31) for inserting screws (4) are uniformly distributed at intervals in the circumferential direction of the ring; the screws (4) are inserted into corresponding hole sites to be screwed and fixed.
2. Halbach assembly according to claim 1, wherein the single rings (1) are five in total, each single ring (1) being the same size, a single magnet group (11) comprising twelve magnet steels (111); according to the sequence from the near to the far in the clockwise direction of the N-level magnetic steel (113), the included angle between the magnetization direction and the magnetization direction of the N-level magnetic steel (113) is increased by 60 degrees in sequence.
3. Halbach assembly according to claim 1, wherein the inner sleeve rim (2) length is longer than the sum of the heights of the individual single rings (1) and less than the height of the individual single rings (1) plus the two end cap plates (3); the inner wall of the end cover plate (3) is provided with a clamping groove (32) which is matched with the inner sleeve steel ring (2) in length.
4. Halbach assembly according to claim 1, wherein the number of single rings (1) is even, the single rings (1) comprising an end single ring (5) and a middle single ring (6), the remaining single rings (1) being the same size except for the end single rings (5) at the end and end; the end part single ring (5) comprises a first magnetic group (51), a first outer sleeve aluminum ring (52) and a positioning pin (13), wherein the first magnetic group (51) is formed by encircling first magnetic steel (511); the middle single ring (6) comprises a second magnetic group (61), a second outer sleeve aluminum ring (62) and a positioning pin (13), and the second magnetic group (61) is formed by encircling second magnetic steel (611); the wall thickness of the first outer sleeve aluminum ring (52) is smaller than that of the second outer sleeve aluminum ring (62), and the thickness of the first magnetic steel (511) is larger than that of the second magnetic steel (611).
5. Halbach assembly according to claim 4, wherein the number of single rings (1) is six.
6. Halbach assembly according to claim 4, wherein the first magnet set (51) has a smaller inner diameter than the second magnet set (61), a thin-walled shielding iron ring (7) is mounted at the inner side of the intermediate single ring (6), the shielding iron ring (7) has the same height as the total height of the intermediate single ring (6), and the shielding iron ring (7) is located at the outer side of the inner sleeve steel ring (2).
7. Halbach assembly according to claim 6, wherein the first magnetic group (51) has an inner diameter smaller than the second magnetic group (61) by 0.2 mm and the shielding iron ring (7) has a wall thickness of 0.1 mm.
8. Halbach assembly according to claim 1, wherein the inner sleeve steel ring (2) is made of stainless steel, and the magnetic steel (111) is made of N45M magnetic steel.
9. Halbach assembly according to claim 1, wherein the outer aluminum ring (12) is of 6061 aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650067.2A CN110261803B (en) | 2019-07-18 | 2019-07-18 | Halbach assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910650067.2A CN110261803B (en) | 2019-07-18 | 2019-07-18 | Halbach assembly |
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| CN110261803A CN110261803A (en) | 2019-09-20 |
| CN110261803B true CN110261803B (en) | 2024-04-02 |
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| CN201910650067.2A Active CN110261803B (en) | 2019-07-18 | 2019-07-18 | Halbach assembly |
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| CN110706877A (en) * | 2019-09-23 | 2020-01-17 | 东南大学 | Low-cost miniature Halbach magnet with adjustable magnetic field uniformity |
| CN111132441A (en) * | 2019-12-31 | 2020-05-08 | 清华大学 | Permanent magnet type quadrupole magnet and assembling method thereof |
| CN112630711A (en) * | 2020-11-16 | 2021-04-09 | 中国石油大学(北京) | Magnet device and nuclear magnetic resonance equipment |
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