CN105206376B - Three-dimensional magnetic field generation device - Google Patents
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Abstract
The invention discloses a three-dimensional magnetic field generation device, comprising three groups of mutually orthogonal one-dimensional magnetic field generators. By adjusting side length sizes of a main coil and an auxiliary coil, relative space positions of the main and auxiliary coils and ampere-turns of the main and auxiliary coils and utilizing the linear relationship between an magnetic field and an electric current, enlargement of a magnetic field homogeneity range in a limited space is realized by adopting a constant-current direct-current power supply to drive the main and auxiliary coils. Compared with any traditional round or square Helmholtz coil, for generating the same magnetic field homogeneity range and magnetic field homogeneity, the limited space needed by the three-dimensional magnetic field generation device is greatly reduced by about 2 to 3 times, and the device is suitable for application occasions with higher requirements on the magnetic field homogeneity range and the magnetic field homogeneity in limited spaces.
Description
Technical field
The invention belongs to magnetic field technique field, and in particular to a kind of three-dimensional magnetic field generating meanss.
Background technology
It is well known that hot-wire coil can produce magnetic field in space, this principle allows people to set according to actual needs
Meter makes the magnetic field generator of one-dimensional, two and three dimensions, to meet the application scenario for having particular/special requirement to environmental magnetic field.
Traditional magnetic field generator structure is typically using annular or the design of rectangular configuration Helmholtz coil.But it is this
The field homogeneity area yardstick that the magnetic field generator of traditional structure is produced is very limited, and (space availability ratio is defined low space utilization
It is field homogeneity area volume divided by spatial volume shared by magnetic field generator), can only use in the abundant occasion in space, it is impossible to meet
The occasion had higher requirements by magnetic field generator volume, field homogeneity area, uniformity of magnetic field three.
By taking one-dimensional magnetic field generator as an example, using loop construction is identical, two loop coils of winding identical or pros
Shape, if require to obtain 800mm × 800mm × 800mm, the Three-Dimensional Magnetic that the uniformity is 0.3% in magnetic field generator geometric center
.According to calculating, circular coil diameter at least needs more than 5m (the corresponding uniformity of magnetic field of 5m is about 0.29%), and square
The length of side of coil needs to reach more than 6.6m (the corresponding uniformity of magnetic field of 6.6m is 0.276%), seldom has laboratory to meet this
Space requirement.
In order to further prove that prior art cannot meet space requirement, in conjunction with instantiation, details are as follows：
As shown in figure 1, conventional three-dimensional magnetic field generator adopts 3 groups of orthogonal square Helmholtz coils, XYZ each dimension
1 group, per group of 2 coils.Fig. 2 shows one group of main coil of X-dimension, and main coil plane is vertical with X-axis, and distance is 2*R1*J1,
The shared height of coil is 2*R1, and as N=3, coil is equilateral triangle, and as N=4, coil is square, when N is infinity
When, coil is circle.In order that the central magnetic field uniformity meets the demand of application, need to adjust N, R1 and J1 totally 3 parameters,
Wherein, based on N coil side number, N is bigger, and coil is closer to circle；R1 is the variable being directly proportional to the main coil length of side, and R1 gets over
Greatly, the length of side of main coil is bigger, and the spatial altitude of occupancy is bigger；Spacing based on J1 between coil, J1 are bigger, two main coils
Every must be more remote, the space length of occupancy be bigger.
If being limited in less than the 2.2 meters traditional three-dimensional magnetic field generators using more than in space, 800mm to be formed ×
800mm × 800mm, the uniformity are 0.3% Three-Dimensional Magnetic place.
We calculate space and are limited in less than 2.2 meters first, using N sides shape coil version, adjust R1, J1, three-dimensional magnetic field
The optimal uniformity that Qu Suoneng reaches.As shown in table 1, as N increases, Three-Dimensional Magnetic place magnetic field tends to uniform, but the uniformity is
1.92%, it is impossible to meet 0.3% requirement.
The optimal uniformity that 1 classical magnetic field generator of table can reach
Secondly, we are counter to push away the uniformity to be made Three-Dimensional Magnetic place reach 0.3%, and square and circular coil institute is respectively adopted
The bulk of occupancy, result of calculation such as table 2, square coil need to take 6.6 meters, and positive 512 side shape (can sub-circular line
Circle) then need to take 5 meters, it follows that no matter adopting square or circular, the size that coil takes is all higher than 2.2 meters, is discontented with
Sufficient space requirement, (wherein, positive 512 side shape is exactly one kind of regular polygon, and side number is for 512).
2 classical magnetic field generator of table needs the bulk for taking
| N | R1 | J1 | The uniformity | The size of occupancy |
| 4 (squares) | 3.3 | 0.3847 | 0.276% | 6.6m |
| 3600 (sub-circulars) | 2.5 | 0.5 | 0.29% | 5m |
Additionally, when the overall dimensions of coil are excessive, on the one hand, the electric parameter such as inductance value and resistance of coil will be notable
Increase, it means that need more powerful power supply, wastes more electric energy；On the other hand, coil method cost also can be significantly
Increase, economy is bad.Therefore, for magnetic field generator indoors etc. confined space occasion is applied, need to improve magnetic field
The space availability ratio of generator, needs in other words to expand field homogeneity area in the confined space and improves the uniformity.
The content of the invention
For the defect of prior art, the invention provides a kind of three-dimensional magnetic field generating meanss, its object is to improve magnetic
The space availability ratio of field generator, expands field homogeneity area in the confined space；Aim to solve the problem that prior art cannot be met to magnetic
The problem of the occasion that the volume of field generator, field homogeneity area and uniformity of magnetic field three have higher requirements.
The invention provides a kind of three-dimensional magnetic field generating meanss, including three groups of mutually orthogonal one-dimensional magnetic field generators, often
The one-dimensional magnetic field generator of group includes a pair of main coils and a pair of ancillary coils；The geometric center of the main coil and the auxiliary
On the same axis, the plane of the plane of the main coil and the ancillary coil is each perpendicular to axis to the geometric center of coil,
A pair of main coils are placed in the middle, and a pair of ancillary coils are symmetrically distributed on the outside of the main coil；Two coils in a pair of main coils
Structure is identical and equal turn numbers；The structure of two coils in a pair of ancillary coils is identical and equal turn numbers.
Further, the structure of the main coil and the ancillary coil is tetragon.
Further, the structure of the main coil and the ancillary coil is square.
Further, the structure of the main coil and the ancillary coil is circle.
Further, the plan range between two coils in a pair of main coils be 2*R1*J1, the height of main coil
It is R2*J2 for the distance between 2*R1, the main coil in homonymy and ancillary coil；R1 is the change being directly proportional to the main coil length of side
Amount, R1 are bigger, and the length of side of main coil is bigger, and the spatial altitude of occupancy is bigger；J1 is in a pair of main coils between two coils
Spacing, J1 are bigger, and every must be more remote, the space length of occupancy be bigger for two main coils；R2 is directly proportional to the ancillary coil length of side
Variable, R2 are bigger, and the length of side of ancillary coil is bigger, and the spatial altitude of occupancy is bigger；Based on J2 between coil and ancillary coil
Spacing, J2 are bigger, and every must be more remote, the space length of occupancy be bigger for the main coil of the same side and ancillary coil.
The present invention realizes the field homogeneity confined space in by adjusting coil relative position using new loop construction
Area and the raising of the uniformity.The loop construction on the basis of traditional circular or square Helmholtz coil (referred to as main coil),
A pair of ancillary coils are increased on its axis, and which is through Biot Savart law and field homogeneity with main coil position
Degree definition is calculated and is determined.It is by a pair of structures and coil turn complete respectively which is mainly characterized by main coil and ancillary coil
The coil of cause to composition, the geometric center of main coil with ancillary coil geometric center on the same axis, main coil and boost line
, perpendicular to axis, main coil is placed in the middle, and ancillary coil is symmetrically distributed on the outside of which for circle plane.
The present invention is by the size dimension of regulation main coil and ancillary coil, the relative tertiary location of major-minor coil and master
The number of ampere turns of auxiliary winding, using the linear relationship of magnetic field and electric current, is realized using the major-minor coil of constant-current dc power drives
The expansion in the field homogeneity area in the confined space.Compared with conventional any a typical round or square Helmholtz coil,
Identical field homogeneity area and uniformity of magnetic field are produced, the confined space required for the present invention is substantially reduced, and about reduces 2～3
Times, it is adaptable to higher application scenario is required to field homogeneity area and uniformity of magnetic field in the confined space.
Description of the drawings
Fig. 1 is structural representation of each the traditional dimension using the three-dimensional magnetic field generator of one group of coil；
Fig. 2 is one-dimensional coil expanded schematic diagram in traditional three-dimensional magnetic field generator；
Fig. 3 is the structural representation of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention；
Fig. 4 is one-dimensional coil expanded schematic diagram in three-dimensional magnetic field generating meanss provided in an embodiment of the present invention；
Fig. 5 is the node grid schematic diagram of the central area of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention；
Fig. 6 is the major-minor coil former of X-dimension and magnetic field simulation of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention
Analysis chart；
Fig. 7 is the major-minor coil former of Y dimensions and magnetic field simulation of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention
Analysis chart；
Fig. 8 is the major-minor coil former of Z-dimension and magnetic field simulation of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention
Analysis chart.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
The three-dimensional magnetic field generating meanss that the present invention is provided can apply to the skills such as magnetic field of the earth, weak magnetic inspection, biomedicine
Art field, using the combined method of main coil and ancillary coil in the present invention, expand in the confined space field homogeneity area and
Improve the uniformity；It is a kind of field generator for magnetic that can expand field homogeneity area and the raising uniformity in the confined space.
As shown in figure 3, the three-dimensional magnetic field generating meanss that provide of the present invention are by the mutually orthogonal conjunction of three groups of one-dimensional magnetic field generators
Into, wherein, per group of one-dimensional magnetic field generator includes that a pair of main coils and a pair of ancillary coils, main coil and ancillary coil can be with
Using quadrilateral structure, the structure is easy to be accurately positioned coil rack, so that the installation in later stage is positioned.
Wherein, 1-4 coils are used to produce X-direction magnetic field, and 5-8 coils are used to produce Y-direction magnetic field, 9-12 coils
For producing Z-direction magnetic field.1-4,5-8 and 9-12 line is placed using along tri- axis directions of X, Y, Z in rectangular coordinate system
Circle is obtained, and the geometric center direction of its coil is the axis direction of coordinate axess, to realize the full remuneration in magnetic field of the earth.Along
Tri- axis directions of X, Y, Z in rectangular coordinate system place the larger field homogeneity of 1-4,5-8 and 9-12 coils acquisition it is trivial and
The Vector Magnetic Fields of the uniformity.
Main coil and ancillary coil respectively by a pair of structures and the on all four coil of coil turn to constituting, main coil
Geometric center and ancillary coil geometric center on the same axis, main coil and ancillary coil plane are perpendicular to axis, main line
Circle is placed in the middle, and ancillary coil is symmetrically distributed on the outside of which.
By the number of ampere turns and main coil and ancillary coil plane of adjustment main coil and ancillary coil space in the axial direction
Position is capable of achieving to produce the field homogeneity area bigger compared with classical magnetic field generator (adopting single group coil) scope and higher magnetic field
The uniformity.As main coil and ancillary coil are driven by a DC current source, when main coil and ancillary coil relative position with
After electric current number of ampere turns ratio-dependent, according to electric current and the linear relationship in magnetic field, it is scalable center magnetic to adjust DC current size
Field intensity, and ensure that field homogeneity area scope and the uniformity are constant.
The present invention compared with prior art, is to set up a pair of ancillary coils in each dimension, as shown in figure 4, main coil
On the same axis, main coil and ancillary coil plane are perpendicular to axis, main line for the geometric center of geometric center and ancillary coil
Circle is placed in the middle, and ancillary coil is symmetrically distributed on the outside of which.
Two main coil plan ranges are 2*R1*J1, and shared height is 2*R1, the ancillary coil of the same side and main coil away from
From for R2*J2, coil installs positioning for convenience, and N takes 4 here, and coil is square, discounting for installing positioning, this example
It is not limited to square.In order that the central magnetic field uniformity meets the demand of application, need to adjust R1, J1, R2, J2 and I2
Totally 5 parameters；Wherein, R1 is the variable being directly proportional to the main coil length of side, and R1 is bigger, and the length of side of main coil is bigger, the sky of occupancy
Between height it is bigger；J1 is the spacing between main coil, and J1 is bigger, and every must be more remote, the space length of occupancy be bigger for two main coils；
R2 is the variable being directly proportional to the ancillary coil length of side, and R2 is bigger, and the length of side of ancillary coil is bigger, and the spatial altitude of occupancy is bigger；
J2 is the spacing between main coil and ancillary coil, and J2 is bigger, the main coil of the same side and ancillary coil every must be more remote, occupancy
Space length is bigger；I2 is the number of ampere turns ratio of ancillary coil and main coil.
In the embodiment of the present invention, the computer optimization process of R1, J1, R2, J2 and I2 totally 5 parameters is as follows：
As shown in figure 5, using the uniformity of Three-Dimensional Magnetic place as object function, its definition isIn above formula,For the close vector of magnetic of magnetic field generator central area；For 800mm
The close vector of magnetic on × 800mm × 800mm magnetic field generators central area node grid.
The design and optimization flow process of three field generator for magnetic of this kind is as follows：
A desired homogeneity range is carried out spatial spreading using square volume mesh by (), desired homogeneity range is then by grid
If dry contact is representing, as shown in Figure 5；
B () assumes that space of the field generator for magnetic on 3 directions is limited to xlim, ylim, zlim；
C () optimizes the uniformity in magnetic field, calculate in xlim, and the magnetic field generator under ylim, zlim space limits can reach
The optimal uniform degree for arriving, that is, seek the minima of (2) formula, it is recommended to use genetic algorithm is completing the optimization process of above-mentioned 5 parameters.
In above formula,For the close vector of magnetic at magnetic field generator center,For the close vector of magnetic of desired homogeneity range.
If (d) optimal uniformity meets required, main and auxiliary index contour circle is determined further according to linear relationship of the electric current with magnetic field
Number of ampere turns, the electromagnet portion of magnetic field generator are designed and are finished.If the optimal uniformity is unsatisfactory for requiring that this is illustrated in xlim,
Under ylim, zlim space limits, the uniformity of magnetic field of magnetic field generator is not up to standard, should loosen space restriction, increase xlim, ylim
And zlim, proceed (c).
According to above-mentioned method for designing, we provide one of which parameter combination, you can row scheme, as shown in table 3.
One of feasible program that table 3 is obtained using the present invention
| R1(m) | J1(m) | I2(A) | R2(m) | J2(m) | The uniformity | |
| X-direction | 1.5560 | 0.2193 | 0.5484 | 1.1904 | 0.5642 | 0.0023 |
| Y-direction | 1.6970 | 0.2373 | 0.6243 | 1.2910 | 0.6218 | 0.0023 |
| Z-direction | 1.7998 | 0.2545 | 0.1331 | 1.2547 | 0.7650 | 0.0021 |
4 main coil of table and ancillary coil physical size and electric parameter
| Model parameter | X-dimension | Y dimensions | Z-dimension |
| The main coil length of side (m) | 2.2005 | 2.4000 | 2.5453 |
| The ancillary coil length of side (m) | 1.6835 | 1.8257 | 1.7744 |
| Main line turn separation (m) | 0.6825 | 0.8056 | 0.9161 |
| Ancillary coil spacing (m) | 2.0257 | 2.4109 | 2.8358 |
| Produce 1Oe main coil currents (At) | 74.9381 | 86.6106 | 99.9505 |
| Produce 1Oe ancillary coil electric currents (At) | 41.0938 | 54.0703 | 13.3034 |
Fig. 6, Fig. 7 and Fig. 8 are X-dimension, Y dimensions and the Z of three-dimensional magnetic field generating meanss provided in an embodiment of the present invention respectively
The major-minor coil former of dimension and Magnetic Field Simulation Analysis figure；It can be seen that the uniformity of magnetic field on tri- directions of X, Y, Z is all
Less than 3/1000ths.
The present invention proposes the compound mode of major-minor coil and realizes field homogeneity area and field homogeneity are improved in the confined space
Property, classical magnetic field coil design mode is further lifted, application request is met.Such as obtain in routine building
(include three-dimensional magnetic field) in 800mm × 800mm × 800mm cubic spaces region, uniformity of magnetic field reaches 0.3% experiment magnetic
.Classical magnetic field coil needs floor height when the field homogeneity area and magnetic field homogeneity is met reaches 5m, and the magnetic field of the present invention
The space of coil needs when above-mentioned requirements are met is 3.6m × 3.6m × 3.6m, can meet the space requirement of routine building,
Comparing classical magnetic field coil spatially reduces 2.68 times.While space is saved, construction cost, coil are fabricated to
This and related corollary equipment (such as driving power supply) expense are substantially reduced, and this aspect has extremely extensive practical and economic worth.
As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to
The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included
Within protection scope of the present invention.
Claims (3)
1. a kind of three-dimensional magnetic field generating meanss, it is characterised in that including three groups of mutually orthogonal one-dimensional magnetic field generators, per group one
Dimension magnetic field generator includes a pair of main coils and a pair of ancillary coils；
The geometric center of the geometric center of the main coil and the ancillary coil on the same axis, the plane of the main coil
Axis is each perpendicular to the plane of the ancillary coil, a pair of main coils are placed in the middle, and a pair of ancillary coils are symmetrically distributed in the master
On the outside of coil；
The structure of two coils in a pair of main coils is identical and equal turn numbers；
The structure of two coils in a pair of ancillary coils is identical and equal turn numbers；
The structure of the main coil and the ancillary coil is tetragon.
2. three-dimensional magnetic field generating meanss as claimed in claim 1, it is characterised in that the main coil and the ancillary coil
Structure is square.
3. three-dimensional magnetic field generating meanss as described in any one of claim 1-2, it is characterised in that two in a pair of main coils
Plan range between coil is 2*R1*J1, and the height of main coil is 2*R1, between the main coil and ancillary coil in homonymy
Distance is R2*J2；
R1 is the variable being directly proportional to the main coil length of side, and R1 is bigger, and the length of side of main coil is bigger, and the spatial altitude of occupancy is bigger；
J1 is the spacing in a pair of main coils between two coils, and J1 is bigger, and two main coils every must be more remote, get over by the space length of occupancy
Greatly；R2 is the variable being directly proportional to the ancillary coil length of side, and R2 is bigger, and the length of side of ancillary coil is bigger, and the spatial altitude of occupancy is got over
Greatly；Spacing based on J2 between coil and ancillary coil, J2 are bigger, and the main coil of the same side, is accounted for every must be more remote with ancillary coil
Space length is bigger.
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| CN106102427B (en) * | 2016-06-03 | 2018-12-11 | 哈尔滨工业大学 | A kind of novel shielding structure and its design method |
| CN106252019B (en) * | 2016-07-09 | 2018-06-19 | 西北工业大学 | A multi-layer three-dimensional magnetic field transmitting coil |
| CN108575042B (en) * | 2017-03-09 | 2021-04-09 | 北京北方华创微电子装备有限公司 | Coil, medium cylinder and plasma cavity |
| CN108535666A (en) * | 2018-03-28 | 2018-09-14 | 深圳市启荣科技发展有限责任公司 | Any direction motion vector uniform magnetic field generating means and control system |
| CN110129890B (en) * | 2018-03-30 | 2021-02-02 | 杭州慧翔电液技术开发有限公司 | Coil structure for magnetically controlled Czochralski single crystal and method for magnetically controlled Czochralski single crystal |
| CN108802836B (en) * | 2018-05-28 | 2020-03-24 | 中石化石油工程技术服务有限公司 | Nuclear magnetic resonance device and logging instrument thereof |
| CN109657386B (en) * | 2018-12-27 | 2023-04-07 | 燕山大学 | Design method of rectangular Helmholtz coil |
| CN110501663B (en) * | 2019-09-24 | 2021-06-08 | 合肥工业大学 | Ultralow-field biplane nuclear magnetic resonance normally-conducting main magnet and construction method thereof |
| CN110646508A (en) * | 2019-11-05 | 2020-01-03 | 广东省特种设备检测研究院珠海检测院 | Enhanced magnetic field type non-directional orthogonal weld eddy current detection sensor and detection method |
| CN110837068B (en) * | 2019-11-25 | 2021-08-20 | 中北大学 | A device that maintains a constant and uniform magnetic field locally and precisely adjusts the direction strength |
| CN117511729B (en) * | 2023-11-08 | 2024-09-20 | 大连海洋大学 | Device, application and method for researching influence of magnetic field on organism |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1988479A2 (en) * | 2007-05-02 | 2008-11-05 | The University of Utah Research Foundation | Coil optimization for magnetic stimulation |
| CN101707860A (en) * | 2009-11-09 | 2010-05-12 | 清华大学 | Passive offset type magnetic shielding device |
| CN204101049U (en) * | 2014-10-24 | 2015-01-14 | 深圳市策维科技有限公司 | Three-dimensional magnetic field mobile phone electronic compass (Compass) proving installation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002232182A (en) * | 2001-02-02 | 2002-08-16 | Mti:Kk | Magnetic shielding room of internal active magnetically shielded system |
| JP2003070027A (en) * | 2001-08-27 | 2003-03-07 | Sony Corp | Magnetic field generator and television receiver manufacturing equipment |
-
2015
- 2015-10-29 CN CN201510715986.5A patent/CN105206376B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1988479A2 (en) * | 2007-05-02 | 2008-11-05 | The University of Utah Research Foundation | Coil optimization for magnetic stimulation |
| CN101707860A (en) * | 2009-11-09 | 2010-05-12 | 清华大学 | Passive offset type magnetic shielding device |
| CN204101049U (en) * | 2014-10-24 | 2015-01-14 | 深圳市策维科技有限公司 | Three-dimensional magnetic field mobile phone electronic compass (Compass) proving installation |
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