CN201732647U - Modified Halbach array permanent magnet device - Google Patents
Modified Halbach array permanent magnet device Download PDFInfo
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- CN201732647U CN201732647U CN2010202727234U CN201020272723U CN201732647U CN 201732647 U CN201732647 U CN 201732647U CN 2010202727234 U CN2010202727234 U CN 2010202727234U CN 201020272723 U CN201020272723 U CN 201020272723U CN 201732647 U CN201732647 U CN 201732647U
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- permanent magnet
- magnet device
- halbach array
- isosceles triangle
- magnet
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Abstract
A modified Halbach array permanent magnet device belongs to the field of permanent magnet mechanisms. Though magnetic field uniformity of Halbach array permanent magnets is increased, repulsion of similar magnets is evident in installation of sector magnets, and the installation is complicated and difficult. The permanent magnet device is a hollow cylindrical permanent magnet equally divided into N=2M pieces along the peripheral direction, the M is an integer larger than 2, the axial cross section of each equal piece of the permanent magnet device is in the shape of a isosceles triangle, lateral sides of one isosceles triangle of two adjacent pieces and a bottom side of the other coincide, an included angle between one lateral side and the bottom side of the triangle is 2pi/N, the axial cross section of the permanent magnet device is a hollow regular N-gon, and side length consists of lateral sides of the isosceles triangles. The modified Halbach array permanent magnet device is simple in structure by modifying the Halbach array permanent magnets, is high in utilization rate of permanent magnet materials, low in processing cost, convenient in installation, high in utilization rate of magnetic field space, high in magnetic field uniformity and less in magnetic leakage, easily increases field intensity, greatly reduces magnet volume, and reduces instrument manufacturing cost.
Description
Technical field
The utility model relates to a kind of permanent magnet mechanism that is used for electron accelerator, NMR magnetostatic field generator, magneto.
Background technology
Physicist doctor K.Halbach of U.S. Lao Lunsi Berkeley National Laboratory has proposed a kind of interesting magnet structure, and this array magnet can converge the magnetic line of force in a side of magnet, then slackens the magnetic line of force at opposite side.Doctor K.Halbach has provided detailed inference and argumentation to the principle of this magnet structure.Provided the design example of the 4 polar circle cylindrical magnet that are put together by 16 trapezoidal magnetic patch.Academia is called Halbach array (Halbach Arrays) with this magnet array mode, when cylindrical magnet adopts the Halbach array, is exactly well-known " Permanent Magnetic Magic Ring ".Halbach array magnet has obtained scientific research personnel's extensive attention with its particular structure and good magnetic signature, and it has been carried out further investigation and has obtained extensive use.
According to analysis and the inference of K.Halbach, the uniform magnetic field that cylindrical magnet produces is subjected to following parameter influence: the inside and outside radius r of cylindrical magnet
iAnd r
o, the magnetization vector of magnetic material
In practice, adopt the manufacturing process of existing permanent-magnet and process equipment to be difficult to make up the direction of magnetization with position continually varying magnet.Therefore, in actual design and in making, often adopting some cross sectional shapes is that fan-shaped, trapezoidal, square or circular magnetic patch constitutes cylindrical magnet, the continuous direction of magnetization of the approximate formation of the direction of magnetization of each magnetic patch.When trapezoidal, circular and square magnetic patch is constructed cylinder with respect to fan-shaped magnetic patch, inevitably introduced geometric error on principle, the magnetic field that causes cylindrical magnet is along the interference that circumferentially is subjected to the high-order harmonic wave magnetic-field component, and uniformity of magnetic field reduces.Therefore, the K.Halbach suggestion adopts the fan-shaped magnetic patch with maximum fill factor, curve factor to make up cylindrical magnet.But the situation that fan-shaped magnetic patch exists the tangible same sex to repel each other when mounted, thereby installation is very complicated also very difficult, and when carrying out the cutting of magnet blank, produce a large amount of waste materials, processing cost height.
The utility model content
The purpose of this utility model is the shortcoming that overcomes existing Halbach array permanent magnet, and a kind of Halbach array permanent magnet of practicality is provided.The magnetic field space utilance height of this permanent magnet, uniformity height, the volume of magnet is little, in light weight, leakage field is few, the utilance height of permanent magnetic material, processing cost is low, and is easy for installation.
The utility model provides a kind of improved Halbach array permanent magnet device, and this permanent magnet device is the column permanent magnet of hollow, along the circumferential direction is divided into N=2
MPiece, M is the integer greater than 2, bonds together with seccotine between the magnetic patch, it is characterized in that:
It is isosceles triangle that each of this permanent magnet device waits the axial cross section of piecemeal, and the waist that two adjacent isoceles triangle shaped position relations are one of them isosceles triangles and the base of another one isosceles triangle overlap, and the waist of described isosceles triangle and the angle on base are
N is the permanent magnet device piece number of five equilibrium along the circumferential direction; The axial cross section of this permanent magnet device is the n-shaped of hollow, and the length of side is the waist of above-mentioned isosceles triangle.
Each magnetic patch shape of forming permanent magnet is identical, magnitude of field intensity equates that the angle of the direction of magnetization and y axle is the twice of the angle of direction of rotation of magnetic patch own and y axle.
This permanent magnet device is that the magnetic patch of isosceles triangle is put together by axial cross section, bonds together with seccotine between the magnetic patch.In the cavity of hollow column uniform magnetic field.
Advantage of the present utility model is: simple in structure, the utilance height of permanent magnetic material, processing cost is low, easy for installation, the magnetic field space utilance is big, the uniformity is high, volume is little, in light weight, leakage field is little.
Description of drawings
The structural representation of the utility model embodiment that Fig. 1 is made up of 8 magnets.Among the figure: 1,2,3,4,5,6,7,8 is the isosceles triangle permanent magnet.
Fig. 2 is the cross sectional representation of the utility model embodiment.
Fig. 3 is the cross sectional representation of the Halbach array permanent magnet formed of fan-shaped magnet by 16 axial cross sections.
The cross sectional representation of the utility model embodiment that Fig. 4 is made up of 16 magnets.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described further.
As shown in Figure 1, the utility model embodiment is the permanent magnet 1,2,3,4,5,6,7,8 that is isosceles triangle by equal and opposite in direction, 8 cross sections that shape is identical, constitutes the column of a hollow by the seccotine adhesion.In the cavity of hollow column uniform magnetic field.Solid arrow is depicted as and respectively organizes the magnetic patch direction of magnetization among Fig. 1, and hollow arrow is a column shape permanent magnet internal magnetic field direction.
As shown in Figure 2, the magnitude of field intensity of each magnetic patch is identical, appoints to get one of them magnetic patch and be numbered 1, and clockwise direction is followed successively by each magnetic patch numbering.The y axle is taken at the centre position of first and last piece magnet abutting edge, and the x axle is vertical with the y axle.The z axle is perpendicular to the plane at x, y axle place.If the line and the y axle clamp angle in the i piece magnet cross-section center and the center of circle are defined as magnetic patch direction of rotation θ
i,
, the then direction of magnetization of i piece magnet and y axle clamp angle
(solid arrow is depicted as each magnetic patch direction of magnetization among the figure).Generally speaking, if magnet is divided into N piece (N=2
M, M is the integer greater than 2), and the direction of rotation of magnetic patch
The then direction of magnetization of i magnetic patch and y axle clamp angle
Be ω
i=2 θ
i, the direction of magnetization of magnetic patch is the twice of the direction of rotation of magnet own.
Here need to prove: if the direction of magnetization of every bit can change continuously by 2 times of directions of given magnet rotation itself in the magnet, the inhomogeneities in whole in theory hollow column internal magnetic field space is zero, in the actual engineering because processing difficulties, can't accomplish at present, therefore adopt the magnet block division method.The piece number of magnet five equilibrium is many more, more near ideal state.
Shown in Figure 3, for being fan-shaped permanent magnet 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 by equal and opposite in direction, 16 cross sections that shape is identical, the cross-sectional view of a hollow column that constitutes by the seccotine adhesion.Arrow is depicted as and respectively organizes the magnetic patch direction of magnetization, repel each other according to the same sex, the rule that there is a natural attraction between the sexes, 3rd, the behavior that has that more significantly there is a natural attraction between the sexes between 4,5 and between the 11st, 12,13 install more convenient, but exist significantly the same sex behavior that repels each other that very difficulty is installed between the 15th, 16,1 and between the 7th, 8,9.
Shown in Figure 4, be the permanent magnet 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 that is isosceles triangle by equal and opposite in direction, 16 cross sections that shape is identical, specifically implement cross-sectional view by the utility model that the seccotine adhesion constitutes.Arrow is depicted as respectively organizes the magnetic patch direction of magnetization, does not have significantly the same sex behavior that repels each other among the figure between each magnetic patch, therefore easy for installation.
In the actual processing of Halbach array, the unit magnet generally all is by the permanent magnet blank being carried out the line cutting and obtaining after the magnet charger magnetization.As a result the unit magnet of sector structure if obtain from the cube blank cutting of standard, certainly leads to a large amount of waste materials.The structure of isosceles triangle can drop to the redundance after the square blank cutting of sintered NdFeB minimum.Therefore, improve the utilance of permanent magnetic material, reduced processing cost.
The good effect of the utility model specific embodiment is as follows:
1. the magnetic field space of the utility model isosceles triangle cylindrical magnet is a column shape, is particularly suitable for chemical-process pipeline or feeding belt and passes through, and therefore is fit to the nuclear magnetic resonance apparatus of on-line real time monitoring.
2. during the utility model isosceles triangle cylindrical magnet actual design, improve the transverse magnetic field uniformity on the cross section by increasing circumferential magnetic patch number.Reduce the volume of magnet relatively, alleviated the weight of instrument.
3. the commercial electrical magnetic field two dimension software for calculation Maxwell 2D that provides through Ansoft company of the utility model and the check of MATLAB software for mathematical computing, the result proves, the magnetic field of isosceles triangle cylindrical magnet is inhibited along the interference that circumferentially is subjected to the high-order harmonic wave magnetic-field component, and uniformity of magnetic field has improved nearly 4 times.So magnetic energy utilization rate height, it is few to obtain the required permanent magnetic material of same magnetic field intensity.
4. the design of the utility model isosceles triangle cylindrical magnet makes the behavior that does not exist the same sex clearly to repel each other between the circumferential adjacent magnetic patch of forming column, and is therefore easy for installation, quick.
5. the design of the utility model isosceles triangle unit magnet structure has improved the utilance of permanent magnetic material, cuts down finished cost.
Above-mentioned good effect of the present utility model has demonstrated fully the utility model than the advantage of Halbach array permanent magnet device in application.
Claims (1)
1. improved Halbach array permanent magnet device, this permanent magnet device is the column permanent magnet of hollow, along the circumferential direction is divided into N=2
MPiece, M is the integer greater than 2, bonds together with seccotine between the magnetic patch, it is characterized in that:
It is isosceles triangle that each of this permanent magnet device waits the axial cross section of piecemeal, and the waist that two adjacent isoceles triangle shaped position relations are one of them isosceles triangles and the base of another one isosceles triangle overlap, and the waist of described isosceles triangle and the angle on base are
N is the permanent magnet device piece number of five equilibrium along the circumferential direction; The axial cross section of this permanent magnet device is the n-shaped of hollow, and the length of side is the waist of above-mentioned isosceles triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202727234U CN201732647U (en) | 2010-07-23 | 2010-07-23 | Modified Halbach array permanent magnet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202727234U CN201732647U (en) | 2010-07-23 | 2010-07-23 | Modified Halbach array permanent magnet device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201732647U true CN201732647U (en) | 2011-02-02 |
Family
ID=43523804
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202727234U Expired - Fee Related CN201732647U (en) | 2010-07-23 | 2010-07-23 | Modified Halbach array permanent magnet device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908399A (en) * | 2010-07-23 | 2010-12-08 | 北京工业大学 | Improved Halbach array permanent magnet device |
| CN102360717A (en) * | 2011-09-23 | 2012-02-22 | 罗子凌 | Liquid magnetizer with variant Halbach permanent magnet array |
| CN103035153A (en) * | 2012-12-07 | 2013-04-10 | 中国科学院安徽光学精密机械研究所 | Permanent magnet device used for Zeeman effect experiments |
| CN103971878A (en) * | 2014-05-20 | 2014-08-06 | 北京京磁电工科技有限公司 | Magnetizing system |
| CN106229106A (en) * | 2016-09-12 | 2016-12-14 | 中国科学院苏州生物医学工程技术研究所 | A kind of design and fabrication method of the Halbach array permanent magnet device of odd-level |
| CN107438777A (en) * | 2015-04-07 | 2017-12-05 | 通用电气(Ge)贝克休斯有限责任公司 | magnet array for magnetic resonance measurement |
| CN110299240A (en) * | 2019-07-09 | 2019-10-01 | 北京麦格易来科技有限公司 | A kind of magnetic device of control magnetic material |
-
2010
- 2010-07-23 CN CN2010202727234U patent/CN201732647U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908399A (en) * | 2010-07-23 | 2010-12-08 | 北京工业大学 | Improved Halbach array permanent magnet device |
| CN101908399B (en) * | 2010-07-23 | 2012-05-30 | 北京工业大学 | Improved Halbach array permanent magnet device |
| CN102360717A (en) * | 2011-09-23 | 2012-02-22 | 罗子凌 | Liquid magnetizer with variant Halbach permanent magnet array |
| CN102360717B (en) * | 2011-09-23 | 2017-05-24 | 罗子凌 | Liquid magnetizer with variant Halbach permanent magnet array |
| CN103035153A (en) * | 2012-12-07 | 2013-04-10 | 中国科学院安徽光学精密机械研究所 | Permanent magnet device used for Zeeman effect experiments |
| CN103971878A (en) * | 2014-05-20 | 2014-08-06 | 北京京磁电工科技有限公司 | Magnetizing system |
| CN103971878B (en) * | 2014-05-20 | 2016-08-31 | 北京京磁电工科技有限公司 | Magnetic charging system |
| CN107438777A (en) * | 2015-04-07 | 2017-12-05 | 通用电气(Ge)贝克休斯有限责任公司 | magnet array for magnetic resonance measurement |
| CN106229106A (en) * | 2016-09-12 | 2016-12-14 | 中国科学院苏州生物医学工程技术研究所 | A kind of design and fabrication method of the Halbach array permanent magnet device of odd-level |
| CN110299240A (en) * | 2019-07-09 | 2019-10-01 | 北京麦格易来科技有限公司 | A kind of magnetic device of control magnetic material |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110202 Termination date: 20110723 |