CN110459378A - A kind of permanent magnetic device generating space uniform magnetic field - Google Patents
A kind of permanent magnetic device generating space uniform magnetic field Download PDFInfo
- Publication number
- CN110459378A CN110459378A CN201910856150.5A CN201910856150A CN110459378A CN 110459378 A CN110459378 A CN 110459378A CN 201910856150 A CN201910856150 A CN 201910856150A CN 110459378 A CN110459378 A CN 110459378A
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- magnetic field
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- space uniform
- permanent magnet
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- 238000010276 construction Methods 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 13
- 239000000725 suspension Substances 0.000 abstract description 5
- 239000004577 thatch Substances 0.000 abstract description 5
- 238000010923 batch production Methods 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 18
- 238000012360 testing method Methods 0.000 description 7
- 238000002595 magnetic resonance imaging Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 241000417436 Arcotheres Species 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0273—Magnetic circuits with PM for magnetic field generation
- H01F7/0278—Magnetic circuits with PM for magnetic field generation for generating uniform fields, focusing, deflecting electrically charged particles
Abstract
The invention discloses a kind of permanent magnetic devices for generating space uniform magnetic field, belong to permanent magnet devices technical field, including magnetic yoke, two permanent magnets and two pole shoes, it is characterized by: two permanent magnets are separately fixed at the magnetic yoke two planar central positions facing with each other, the opposite face polarity of two permanent magnets is opposite；Two pole shoes are fixed on one to one on two permanent magnets, and the space between the bipolar shoe is air gap region, are provided with pit on two pole shoes；The present invention is made pole shoe play convergence magnetic fields, can be significantly improved the magnetic field homogeneity in air gap in spatial dimension using the method for processing pit on pole shoe；Permanent magnetic device structure of the invention is simple, small in size, light-weight, convenient for batch production；The present invention can be not only widely used to promote in long-range navigation thatch magnetic suspension driver, can be also used for magnetron permanent magnetic device, MRI system etc..
Description
Technical field
The present invention relates to permanent magnet devices technical field more particularly to a kind of permanent magnetic devices for generating space uniform magnetic field.
Background technique
Permanent magnetic device can provide static magnetic field or dynamic magnetic field, uniform magnetic field or gradient magnetic within the scope of particular space
, specific function may be implemented in the various physical effects in applied energy conversion and magnetic field.Such as it will be quiet using Coulomb force law
Magnetic energy is changed into mechanical energy, converts mechanical energy into electric energy using Faraday's law, will based on the Lorentz force principle to conductor
Electric energy is converted to mechanical energy etc..Permanent magnetic device application field is boundless, such as short-wave communication tedhnology, electrical engineering, magnetic point
From technology, Magnetic resonance imaging and particle spectrum measuring technique etc..
In the field for much generating magnetostatic field using permanent magnet, often requires that and generate height within the scope of certain space uniformly
Magnetic field, to generate active force, or the movement of control electronics to the electrified wire being placed in its air gap.For example long-range navigation thatch magnetic suspension swashs
Encourage device, for another example devices such as magnetron, nuclear magnetic resonance.By taking long-range navigation thatch magnetic suspension driver as an example, uniform magnetic field makes long-range navigation thatch
When the electrified wire of magnetic suspension driver is displaced in a certain range, the total radical of the magnetic line of force of conducting wire cutting is remained unchanged, whole
Magnetic flux density is constant, so that electrified wire stress be made to be consistent.
Report about various permanent magnetic devices has had very much, such as Chinese patent 201610258521.6,
03136672.4,201110408498.1,201610639248.1 etc..It is existing from the point of view of numerous published pertinent literatures
Permanent magnetic device usually forms magnetic circuit by permanent magnet, pole shoe and magnetic yoke.
Under the premise of bipolar shoe spacing is fixed, in order to generate uniform magnetic field in a certain range of air gap center, usually adopt
Method is to increase the volume and size of permanent magnet and pole shoe, but this will increase the volume and weight of permanent magnetic device.In for example,
State's patent application 201110408498.1 increases auxiliary magnet around main magnet to compensate the leakage of the field strength of main magnet outer rim and come
Expand the range in field homogeneity area, but this method increase magnet physical dimensions, while introducing complicated manufacturing process, increases
Cost.Chinese patent application 201320757529.9,03136672.4 etc. is increased using modes such as concave pole shoe or magnetism gathering rings
Add shimming effect.
The above-mentioned prior art there is also common issue be: only realize air gap central plane within the scope of uniformity, hang down
Directly in being gradient fields on the direction of permanent magnet pole-face, closer apart from pole-face, magnetic induction intensity is stronger.
Summary of the invention
The object of the invention is that a kind of permanent magnetic device for generating space uniform magnetic field is provided, to solve the above problems.
To achieve the goals above, the technical solution adopted by the present invention is that such: a kind of to generate space uniform magnetic field
Permanent magnetic device, including magnetic yoke, two permanent magnets and two pole shoes, two permanent magnets are separately fixed at magnetic yoke face each other
Pair two planar central positions, the opposite face polarity of two permanent magnets is opposite；Two pole shoes are fixed on one to one
On two permanent magnets, the space between the bipolar shoe is air gap region, is provided with pit on two pole shoes.
It is preferred that the permanent magnet, width of pole shoe are consistent with magnetic yoke width dimensions.
The pole shoe shape is consistent with permanent magnet, and pit is arranged on pole shoe, and pit plays convergence magnetic fields, can significantly change
Magnetic field homogeneity in kind air gap.
The magnetic yoke, pole shoe are permeability magnetic material.
As a preferred technical scheme: the pit is spherical shape, cydariform, truncated cone-shaped, arc, square cone or two kinds aforementioned
And the above combination of shapes pit.
As a preferred technical scheme: the magnetic yoke, permanent magnet and pole shoe are adhesively fixed with adhesive.
As a preferred technical scheme: the magnetic yoke is square frame-shaped or C-shaped.It can be integrated or splicing construction.
As a preferred technical scheme: the permanent magnet is square, cuboid or cylindrical body.
As a preferred technical scheme: the permanent magnet is integrated or splicing construction.
As further preferred technical solution: the permanent magnet is splicing construction, and additional un-conducted magnetic material is fixed.
Compared with the prior art, the advantages of the present invention are as follows: the present invention makes pole using the method for processing pit on pole shoe
Boots play convergence magnetic fields, can significantly improve the magnetic field homogeneity in air gap in spatial dimension；This permanent magnetic device structure is simple,
It is small in size, light-weight, convenient for batch production；The present invention can be not only widely used to promote in long-range navigation thatch magnetic suspension driver,
It can be also used for magnetron permanent magnetic device, MRI system etc..
Detailed description of the invention
Fig. 1 is the axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 1；
Fig. 2 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 1；
Fig. 3 is the sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 1；
Fig. 4 is air-gap field middle section three-dimensional space 6mm × 6mm × 6mm regional magnetic field distribution map of the embodiment of the present invention 1；
Fig. 5 is the air-gap field middle section three-dimensional space 6mm × 6mm × region 6mm magnetic of the comparative example 1 of the embodiment of the present invention 1
Field pattern；
Fig. 6 is the air-gap field middle section three-dimensional space 6mm × 6mm × region 6mm magnetic of the comparative example 2 of the embodiment of the present invention 1
Field pattern；
Fig. 7 is the axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 2；
Fig. 8 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 2；
Fig. 9 is the pole shoe sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 2；
Figure 10 is the sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 2；
Figure 11 is air-gap field middle section three-dimensional space 16mm × 16mm × 6mm regional magnetic field distribution of the embodiment of the present invention 2
Figure；
Figure 12 is air-gap field middle section three-dimensional space 16mm × 16mm × region 6mm of the comparative example 3 of the embodiment of the present invention 2
Distribution of Magnetic Field figure；
Figure 13 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 3；
Figure 14 is the pole shoe sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 3；
Figure 15 is air-gap field middle section three-dimensional space 16mm × 16mm × 6mm regional magnetic field distribution of the embodiment of the present invention 3
Figure；
Figure 16 is the axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 4；
Figure 17 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 4；
Figure 18 is the pole shoe sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 4；
Figure 19 is air-gap field middle section three-dimensional space 60mm × 5mm × 5mm regional magnetic field distribution of the embodiment of the present invention 4
Figure；
Figure 20 is air-gap field middle section three-dimensional space 60mm × 5mm × region 5mm of the comparative example 4 of the embodiment of the present invention 4
Distribution of Magnetic Field figure；
Figure 21 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 5；
Figure 22 is air-gap field middle section three-dimensional space 60mm × 5mm × 5mm regional magnetic field distribution of the embodiment of the present invention 5
Figure；
Figure 23 is the axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 6；
Figure 24 is the pole shoe axonometric drawing of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 6；
Figure 25 is the sectional view of the generation space uniform magnetic field permanent magnet device of the embodiment of the present invention 6；
Figure 26 is air-gap field middle section three-dimensional space 12mm × 12mm × 9mm regional magnetic field distribution of the embodiment of the present invention 6
Figure；
Figure 27 is air-gap field middle section three-dimensional space 12mm × 12mm × region 9mm of the comparative example 5 of the embodiment of the present invention 6
Distribution of Magnetic Field figure.
In figure: 1, magnetic yoke；2, permanent magnet；3, pole shoe；4, field homogeneity area；5, pit.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Embodiment 1
A kind of generation space uniform magnetic field permanent magnet device, as shown in Fig. 1 ~ 3, a square frame-shaped magnetic yoke 1, a pair of of pros' bodily form permanent magnetism
Body 2 is separately fixed at the two planar central positions facing with each other of magnetic yoke 1, and the opposite face polarity of two permanent magnets 2 is opposite；Two set
The pole shoe 3 for being equipped with spherical pit 5 is separately fixed on a pair of of permanent magnet 2, and the space between pole shoe 3 is magnetic gap region, should
Region forms field homogeneity area 4；Fig. 4 is Fig. 1 air gap middle section three-dimensional space 6mm × 6mm × 6mm Distribution of Magnetic Field figure, most
Big magnetic field 132.336mT, minimum-B configuration 131.198mT, uniformity of magnetic field ± 0.43%.Uniformity of magnetic field is calculated by following formula:
The uniformity=± [(maximum field-minimum-B configuration)/(maximum field+minimum-B configuration)] × 100%
Comparative example 1
Compared with Example 1, other than being not provided with pit on pole shoe 3, remaining structure is same as Example 1 for this comparative example, packet
It is all the same to include remaining building block, positional relationship and connection relationship, the size of component etc., using side same as Example 1
The uniformity of magnetic field of method test comparison example 1, Fig. 5 are air gap middle section three-dimensional space 6mm × 6mm × 6mm Distribution of Magnetic Field figure,
Maximum field 167.884mT, minimum-B configuration 160.950mT, uniformity of magnetic field ± 2.11%.
Comparative example 2
This comparative example is on the basis of comparative example 1, by magnet and pole shoe the face dimension enlargement 33.3% vertical with magnetizing direction, magnetic yoke
Width dimensions be consistent with magnet size.Remaining structure is identical as comparative example 1, including remaining building block, position close
System and connection relationship, the size of component etc. are all the same, using the field homogeneity of method test comparison example 2 identical with comparative example 1
Degree, Fig. 6 are air gap middle section three-dimensional space 6mm × 6mm × 6mm Distribution of Magnetic Field figure, and maximum field 210.444mT is minimum
Magnetic field 207.401mT, uniformity of magnetic field ± 0.73%.
Embodiment 2
A kind of generation space uniform magnetic field permanent magnet device, as shown in Fig. 7 ~ 10, a seamed edge carries out the square frame-shaped magnetic of chamfered
Yoke 1, a pair of of cuboid permanent magnet 2 are separately fixed at the two planar central positions facing with each other of magnetic yoke 1, two permanent magnets 2
Opposite face polarity is opposite；Two pole shoes 3 for being provided with cydariform pit 5 are separately fixed on a pair of of permanent magnet 2, between pole shoe 3
Space is magnetic gap region, which forms field homogeneity area 4；Figure 11 be Fig. 7 air gap middle section three-dimensional space 16mm ×
16mm × 6mm Distribution of Magnetic Field figure, maximum field 230.321mT, minimum-B configuration 225.057mT, uniformity of magnetic field ± 1.16%.
Comparative example 3
Compared with Example 2, other than being not provided with pit on pole shoe 3, remaining structure is same as Example 2 for this comparative example, packet
It is all the same to include remaining building block, positional relationship and connection relationship, the size of component etc., using side same as Example 2
The uniformity of magnetic field of method test comparison example 3, Figure 12 are air gap middle section three-dimensional space 16mm × 16mm × 6mm Distribution of Magnetic Field
Figure, maximum field 260.981mT, minimum-B configuration 242.979mT, uniformity of magnetic field ± 3.57%.
Embodiment 3
The present embodiment difference from Example 2 is the truncated cone-shaped pit being arranged on pole shoe, as shown in Figure 13 ~ 14.Remaining knot
Structure is same as Example 2, all the same including remaining building block, positional relationship and connection relationship, the size of component etc., uses
The uniformity of magnetic field of method testing example 3 same as Example 2, Figure 15 be air gap middle section three-dimensional space 16mm ×
16mm × 6mm Distribution of Magnetic Field figure, maximum field 231.548mT, minimum-B configuration 226.352mT, uniformity of magnetic field ± 1.13%.
Embodiment 4
A kind of generation space uniform magnetic field permanent magnet device, as shown in Figure 16 ~ 18, a square frame-shaped magnetic yoke 1, a pair of of cuboid is forever
Magnet 2 is separately fixed at the two planar central positions facing with each other of magnetic yoke 1, and the opposite face polarity of two permanent magnets 2 is opposite；Two
It is provided with the spherical cuboid pole shoe 3 for combining pit with arc to be separately fixed on a pair of of permanent magnet 2, the sky between pole shoe 3
Between be magnetic gap region, the region formed field homogeneity area 4；Figure 19 be Figure 16 air gap middle section three-dimensional space 60mm ×
5mm × 5mm Distribution of Magnetic Field figure, maximum field 190.876mT, minimum-B configuration 189.111mT, uniformity of magnetic field ± 0.46%.
Comparative example 4
This comparative example compared with Example 4, in addition to be not provided on pole shoe 3 it is spherical combine pit with arc other than, remaining structure and
Embodiment 4 is identical, all the same including remaining building block, positional relationship and connection relationship, the size of component etc., using with reality
Apply the uniformity of magnetic field of the identical method test comparison example 4 of example 4, Figure 20 be air gap middle section three-dimensional space 60mm × 5mm ×
5mm Distribution of Magnetic Field figure, maximum field 221.115mT, minimum-B configuration 214.974mT, uniformity of magnetic field ± 1.41%.
Embodiment 5
The present embodiment difference from Example 4 is the square cone pit being arranged on pole shoe, as shown in figure 21.Remaining structure
It is same as Example 4, it is all the same including remaining building block, positional relationship and connection relationship, the size of component etc., using with
The uniformity of magnetic field of the identical method testing example 5 of embodiment 4, Figure 22 are air gap middle section three-dimensional space 60mm × 5mm
× 5mm Distribution of Magnetic Field figure, maximum field 183.953mT, minimum-B configuration 182.567mT, uniformity of magnetic field ± 0.38%.
Embodiment 6
This embodiment differs from embodiment 1 in that permanent magnet 2 is cylindrical, magnetic yoke 1 is c-type, structure such as Figure 23 ~ 25 institute
Show.Figure 26 is air gap middle section three-dimensional space 12mm × 12mm × 9mm Distribution of Magnetic Field figure in Figure 23, maximum field
130.630mT, minimum-B configuration 129.353mT, uniformity of magnetic field ± 0.49%.
Comparative example 5
This comparative example compared with Example 6, other than being not provided with spherical pit on pole shoe 3, remaining structure and 6 phase of embodiment
Together, all the same including remaining building block, positional relationship and connection relationship, the size of component etc., use is same as Example 6
Method test comparison example 5 uniformity of magnetic field, Figure 27 is air gap middle section three-dimensional space 12mm × 12mm × magnetic field 9mm point
Butut, maximum field 147.655mT, minimum-B configuration 142.951mT, uniformity of magnetic field ± 1.62%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of permanent magnetic device for generating space uniform magnetic field, including magnetic yoke, two permanent magnets and two pole shoes, feature exist
The magnetic yoke two planar central positions facing with each other are separately fixed in: two permanent magnets, two permanent magnets
Opposite face polarity is opposite；Two pole shoes are fixed on one to one on two permanent magnets, the sky between the bipolar shoe
Between be air gap region, be provided with pit on two pole shoes.
2. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 1, it is characterised in that: the pit is
Spherical shape, cydariform, truncated cone-shaped, arc, square cone or aforementioned two kinds and the above combination of shapes pit.
3. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 1, it is characterised in that: the magnetic yoke,
Permanent magnet and pole shoe are adhesively fixed with adhesive.
4. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 1, it is characterised in that: the magnetic yoke is
Square frame-shaped or C-shaped.
5. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 1, it is characterised in that: the permanent magnet
For square, cuboid or cylindrical body.
6. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 1, it is characterised in that: the permanent magnet
It is integrated or splicing construction.
7. a kind of permanent magnetic device for generating space uniform magnetic field according to claim 6, it is characterised in that: the permanent magnet
For splicing construction, additional un-conducted magnetic material is fixed.
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| CN201910856150.5A CN110459378A (en) | 2019-09-11 | 2019-09-11 | A kind of permanent magnetic device generating space uniform magnetic field |
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| CN201910856150.5A CN110459378A (en) | 2019-09-11 | 2019-09-11 | A kind of permanent magnetic device generating space uniform magnetic field |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111524678A (en) * | 2020-04-01 | 2020-08-11 | 张丽 | Magnet structure and method for electron and proton energy spectrum measurement |
| CN113707405A (en) * | 2021-08-05 | 2021-11-26 | 北京航空航天大学 | Magnetic field generating device suitable for vacuum coating equipment |
| CN115295377A (en) * | 2022-09-26 | 2022-11-04 | 西南应用磁学研究所(中国电子科技集团公司第九研究所) | Permanent magnet focusing system of microwave device |
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| US4998976A (en) * | 1987-10-07 | 1991-03-12 | Uri Rapoport | Permanent magnet arrangement |
| JPH08195310A (en) * | 1995-01-19 | 1996-07-30 | Hitachi Ltd | Superconducting magnet device |
| CN2404130Y (en) * | 1999-12-01 | 2000-11-01 | 深圳市万济高科技产业投资发展有限公司 | Magnet apparatus using for magnetic resonance imaging system |
| CN203746602U (en) * | 2013-11-27 | 2014-07-30 | 西南应用磁学研究所 | Permanent magnet device |
| CN106057613A (en) * | 2016-08-08 | 2016-10-26 | 成都八九九科技有限公司 | C-shaped magnetic assembly for magnetron |
| CN210223697U (en) * | 2019-09-11 | 2020-03-31 | 西南应用磁学研究所 | Permanent magnet device for generating space uniform magnetic field |
-
2019
- 2019-09-11 CN CN201910856150.5A patent/CN110459378A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4998976A (en) * | 1987-10-07 | 1991-03-12 | Uri Rapoport | Permanent magnet arrangement |
| JPH08195310A (en) * | 1995-01-19 | 1996-07-30 | Hitachi Ltd | Superconducting magnet device |
| CN2404130Y (en) * | 1999-12-01 | 2000-11-01 | 深圳市万济高科技产业投资发展有限公司 | Magnet apparatus using for magnetic resonance imaging system |
| CN203746602U (en) * | 2013-11-27 | 2014-07-30 | 西南应用磁学研究所 | Permanent magnet device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111524678A (en) * | 2020-04-01 | 2020-08-11 | 张丽 | Magnet structure and method for electron and proton energy spectrum measurement |
| CN113707405A (en) * | 2021-08-05 | 2021-11-26 | 北京航空航天大学 | Magnetic field generating device suitable for vacuum coating equipment |
| CN115295377A (en) * | 2022-09-26 | 2022-11-04 | 西南应用磁学研究所(中国电子科技集团公司第九研究所) | Permanent magnet focusing system of microwave device |
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