CN104299749A - V-shaped permanent magnet device capable of generating static gradient magnetic field - Google Patents
V-shaped permanent magnet device capable of generating static gradient magnetic field Download PDFInfo
- Publication number
- CN104299749A CN104299749A CN201410579797.5A CN201410579797A CN104299749A CN 104299749 A CN104299749 A CN 104299749A CN 201410579797 A CN201410579797 A CN 201410579797A CN 104299749 A CN104299749 A CN 104299749A
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- permanent magnet
- cylindrical permanent
- shimming
- shaped
- magnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Abstract
The invention discloses a V-shaped permanent magnet device capable of generating a static gradient magnetic field. The V-shaped permanent magnet device capable of generating the static gradient magnetic field comprises a V-shaped magnet yoke, a first cylindrical permanent magnet, a second cylindrical permanent magnet, a first shimming gasket and a second shimming gasket, wherein the first cylindrical permanent magnet and the second cylindrical permanent magnet are arranged in an axial symmetry mode, the first shimming gasket and the second shimming gasket are arranged in an axial symmetry mode, the magnetization direction of the first cylindrical permanent magnet and the magnetization direction of the second cylindrical permanent magnet are in the axial directions of the cylinders respectively, the residual magnetism of the first cylindrical permanent magnet is as the same as the residual magnetism of the second cylindrical permanent magnet, and the magnetic pole of the end, connected with the V-shaped magnet yoke, of the first cylindrical permanent magnet is opposite to the magnetic pole of the end, connected with the V-shaped magnet yoke, of the second cylindrical permanent magnet. A static gradient field area generated by the V-shaped permanent magnet device is located in a V-shaped structural cavity between the two shimming gaskets, and material aging of a composite insulator on a core rod is detected conveniently. Besides, the V-shaped permanent magnet device is simple in overall structure, small in size and convenient to carry. The V-shaped permanent magnet device can change the uniformity of the magnetic field in the static gradient field area by changing a V-shaped included angle of the V-shaped magnet yoke and gradient angles of the shimming gaskets, and improves nuclear magnetic resonance signal quality.
Description
Technical field
The invention belongs to permanent magnet mechanism field, be specifically related to the static-magnetic body structure in nuclear magnetic resonance apparatus.
Background technology
As nondestructive measurement means, nuclear magnetic resonance technique has been widely used in the fields such as food quality analysis, geophysics, biomedicine, material science.
Nuclear magnetic resonance technique such as can be utilized from microcosmic aspect to analyze the chemical aging of composite insulator.Composite insulator relies on the premium properties such as its quality is light, good mechanical property to be widely used in power system transmission line, but the aging safe operation to electric power system of composite insulator exists potential threat.In prior art, as patent CN201210248887.7 proposes the aging transducer of a kind of Non-Destructive Testing composite insulator, this sensor magnet structure is C shape structure, facilitate transducer to be directly clipped on full skirt and measure degree of aging, but the T2 of the composite insulator be attached on plug is measured in inconvenience.
Summary of the invention
In view of this, the object of this invention is to provide a kind of V-arrangement permanent magnet device producing static gradient magnetic, to solve the problem of existing checkout equipment to composite insulator ageing management inconvenience on plug.
The present invention produces the V-arrangement magnet structure of static gradient magnetic, comprises by the first magnet holder and V-shaped V shape iron yoke, the first cylindrical permanent magnet be fixed in the first magnet holder, the second cylindrical permanent magnet be fixed in the second magnet holder, the first shimming pad being fixed on the first cylindrical permanent magnet upper end and the second shimming pad be fixed in the second cylindrical permanent magnet connected to form of the second magnet holder;
Described first cylindrical permanent magnet and the second cylindrical permanent magnet are fixed in the V-type groove of V shape iron yoke with axial symmery shape, and the first shimming pad also becomes axial symmery shape to arrange with the second shimming pad;
The direction of magnetization of the first cylindrical permanent magnet and the second cylindrical permanent magnet all along cylinder axis to, first cylindrical permanent magnet is identical with the remanent magnetism size of the second cylindrical permanent magnet, and the first cylindrical permanent magnet is contrary with the magnetic pole of one end that V shape iron yoke is connected with the second cylindrical permanent magnet.
Further, described first shimming pad and the second shimming pad are wedge shape.
Further, described first magnet holder and the second magnet holder are respectively arranged with circular location notch, described first cylindrical permanent magnet and the second cylindrical permanent magnet are arranged in corresponding circular location notch, all be bolted to connection between described first shimming pad and the first magnet holder and between the second shimming pad and the second magnet holder, the first cylindrical permanent magnet and the second cylindrical permanent magnet are pressed abd fixed in corresponding magnet holder by the shimming pad of correspondence.
Beneficial effect of the present invention:
A kind of V-arrangement permanent magnet device producing static gradient magnetic of the present invention, in its static gradient fields region produced v-shaped structure cavity between two shimming pads, composite insulator material aging on convenient detection plug, and overall structure is simple, volume is little, is convenient for carrying.And this V-arrangement permanent magnet device changes the uniformity of static gradient fields region internal magnetic field by the V-arrangement angle of change V shape iron yoke and the angle of gradient angle of shimming pad, improves NMR signal quality.
Accompanying drawing explanation
Fig. 1 is the perspective view that the present invention produces the V-arrangement permanent magnet device of static gradient magnetic;
Fig. 2 is the schematic diagram of composite insulator on V-arrangement permanent magnet device measure-axis;
Fig. 3 is the static magnetic field homogeneous area horizontal cross-section Distribution of Magnetic Field figure that in embodiment, V-arrangement permanent magnet device produces,
Fig. 4 is the static magnetic field homogeneous area longitudinal cross-section Distribution of Magnetic Field figure that in embodiment, V-arrangement permanent magnet device produces.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, the present embodiment produces the V-arrangement permanent magnet device of static gradient magnetic, comprises by the first magnet holder 1 and V-shaped V shape iron yoke, the first cylindrical permanent magnet 3 be fixed in the first magnet holder 1, the second cylindrical permanent magnet 4 be fixed in the second magnet holder 2, the first shimming pad 5 being fixed on the first cylindrical permanent magnet 3 upper end and the second shimming pad 6 be fixed in the second cylindrical permanent magnet 4 connected to form of the second magnet holder 2;
Described first cylindrical permanent magnet 3 and the second cylindrical permanent magnet 4 are fixed in the V-type groove of V shape iron yoke with axial symmery shape, and the first shimming pad 5 also becomes axial symmery shape to arrange with the second shimming pad 6;
The direction of magnetization of the first cylindrical permanent magnet 3 and the second cylindrical permanent magnet 4 all along cylinder axis to, first cylindrical permanent magnet 3 is identical with the remanent magnetism size of the second cylindrical permanent magnet 4, and the first cylindrical permanent magnet 3 is contrary with the magnetic pole of one end that V shape iron yoke is connected with the second cylindrical permanent magnet 4, such as shown in Fig. 1, the S pole of the first cylindrical permanent magnet 3 is connected with V shape iron yoke, and the N pole of the second cylindrical permanent magnet 4 is connected with V shape iron yoke.
In the present embodiment, described first magnet holder 1 and the second magnet holder 2 are respectively arranged with circular location notch, described first cylindrical permanent magnet 3 and the second cylindrical permanent magnet 4 are arranged in corresponding circular location notch, between described first shimming pad 5 and the first magnet holder 1, and second is all fixedly connected with by bolt 7 between shimming pad 6 and the second magnet holder 2, first cylindrical permanent magnet 3 and the second cylindrical permanent magnet 4 are pressed abd fixed in corresponding magnet holder by the shimming pad of correspondence, between permanent magnet and shimming pad and V shape iron yoke, laminating closely, fixation, and easy accessibility.
In the v-shaped structure cavity of the static gradient fields region that the present embodiment V-arrangement permanent magnet device produces between two shimming pads, by in the V-arrangement space shown in Fig. 2, composite insulator 8 is placed between shimming pad during detection, composite insulator material aging situation on plug can be detected easily, and the overall structure of this V-arrangement permanent magnet device is simple, volume is little, is convenient for carrying.
And in the present embodiment, described first shimming pad 5 and the second shimming pad are wedge shape 6, by changing, there is the shimming pad of different gradient angle β, or change the V-arrangement angle theta of V shape iron yoke, the uniformity of static gradient fields region internal magnetic field can be changed, improve NMR signal quality.
Concrete, in the present embodiment, two cylindrical permanent magnet blocks are of a size of
remanent magnetism size is 1T.Two shimming pads are processed into by the silicon steel sheet of the wide 55mm of the long 70mm of 5 thickness 2mm, and the angle of gradient β of shimming pad is 7.9 °.First magnet holder 1 and the second magnet holder 2 are processed into by 6 wide 50mm silicon steel sheets of the long 96.7mm of thick 2mm, and V-arrangement angle theta is 106 °.
As shown in Figure 3, this magnetic field is uniformly distributed in the horizontal plane, and in the aspect of Z=12.5mm, producing the uniformity in 10mm × 10mm region is 6 ‰.As shown in Figure 4, on longitudinal section, magnetic field decays to 176.6mT from 218.3mT with constant gradient 8.3T/m.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (3)
1. produce a V-arrangement permanent magnet device for static gradient magnetic, it is characterized in that: comprise by the first magnet holder and V-shaped V shape iron yoke, the first cylindrical permanent magnet be fixed in the first magnet holder, the second cylindrical permanent magnet be fixed in the second magnet holder, the first shimming pad being fixed on the first cylindrical permanent magnet upper end and the second shimming pad be fixed in the second cylindrical permanent magnet connected to form of the second magnet holder;
Described first cylindrical permanent magnet and the second cylindrical permanent magnet are fixed in the V-type groove of V shape iron yoke with axial symmery shape, and the first shimming pad also becomes axial symmery shape to arrange with the second shimming pad;
The direction of magnetization of the first cylindrical permanent magnet and the second cylindrical permanent magnet all along cylinder axis to, first cylindrical permanent magnet is identical with the remanent magnetism size of the second cylindrical permanent magnet, and the first cylindrical permanent magnet is contrary with the magnetic pole of one end that V shape iron yoke is connected with the second cylindrical permanent magnet.
2. a kind of V-arrangement permanent magnet device producing static gradient magnetic according to claim 1, is characterized in that: described first shimming pad and the second shimming pad are wedge shape.
3. a kind of V-arrangement permanent magnet device producing static gradient magnetic according to claim 1 and 2, it is characterized in that: described first magnet holder and the second magnet holder are respectively arranged with circular location notch, described first cylindrical permanent magnet and the second cylindrical permanent magnet are arranged in corresponding circular location notch, all be bolted to connection between described first shimming pad and the first magnet holder and between the second shimming pad and the second magnet holder, the first cylindrical permanent magnet and the second cylindrical permanent magnet are pressed abd fixed in corresponding magnet holder by the shimming pad of correspondence.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410579797.5A CN104299749B (en) | 2014-10-24 | 2014-10-24 | A kind of V-arrangement permanent magnet device producing static gradient magnetic field |
| PCT/CN2014/093048 WO2016061875A1 (en) | 2014-10-24 | 2014-12-04 | V-shaped permanent magnet device capable of generating static gradient magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410579797.5A CN104299749B (en) | 2014-10-24 | 2014-10-24 | A kind of V-arrangement permanent magnet device producing static gradient magnetic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104299749A true CN104299749A (en) | 2015-01-21 |
| CN104299749B CN104299749B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410579797.5A Active CN104299749B (en) | 2014-10-24 | 2014-10-24 | A kind of V-arrangement permanent magnet device producing static gradient magnetic field |
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| Country | Link |
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| CN (1) | CN104299749B (en) |
| WO (1) | WO2016061875A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3951417B1 (en) * | 2020-08-07 | 2024-05-01 | Bruker Biospin GmbH & Co. KG | Nmr-sensor with a v-shaped sample space for analysis of liquids |
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| JPH11260632A (en) * | 1998-03-13 | 1999-09-24 | Aisan Ind Co Ltd | Linear solenoid actuator |
| US6873077B2 (en) * | 2001-09-26 | 2005-03-29 | Vacuumschmelze Gmbh & Co. Kg | Shell-shaped magnet |
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| JP2008067474A (en) * | 2006-09-06 | 2008-03-21 | Mitsui High Tec Inc | Rotor |
| CN101958623A (en) * | 2010-06-13 | 2011-01-26 | 上海川邻精密配件有限公司 | High torque density, high power density, low disturbance permanent magnet rotating machine |
| CN102136341A (en) * | 2010-12-30 | 2011-07-27 | 包头稀土研究院 | Anisotropic V-shaped orienting magnet ring |
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| CN102735706A (en) * | 2012-07-18 | 2012-10-17 | 重庆大学 | Nuclear magnetic resonance sensor used for nondestructive aging resonance of umbrella skirt of composite insulator |
| CN103219814A (en) * | 2013-04-09 | 2013-07-24 | 沈阳工业大学 | Asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities |
| WO2014034344A1 (en) * | 2012-08-31 | 2014-03-06 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
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| CN1217201C (en) * | 2000-01-19 | 2005-08-31 | 千年技术公司 | C-shaped magnetic resonance imaging system |
| JP2007097761A (en) * | 2005-10-03 | 2007-04-19 | Neomax Co Ltd | Magnetic field generator |
| CN102024546B (en) * | 2009-09-09 | 2012-03-07 | 中国石油天然气股份有限公司 | Gradient permanent magnet for constant gradient field rock sample analyzer |
| JP2011217913A (en) * | 2010-04-08 | 2011-11-04 | Mr Technology:Kk | Temperature control method and unit |
| CN102110513B (en) * | 2010-12-15 | 2013-07-31 | 东南大学 | Magnetic circuit for detecting chip through nuclear magnetic resonance microscope |
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2014
- 2014-10-24 CN CN201410579797.5A patent/CN104299749B/en active Active
- 2014-12-04 WO PCT/CN2014/093048 patent/WO2016061875A1/en active Application Filing
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5556455A (en) * | 1979-07-03 | 1980-04-25 | Tokuzo Inariba | Miniature synchronous motor |
| JPH11260632A (en) * | 1998-03-13 | 1999-09-24 | Aisan Ind Co Ltd | Linear solenoid actuator |
| US6873077B2 (en) * | 2001-09-26 | 2005-03-29 | Vacuumschmelze Gmbh & Co. Kg | Shell-shaped magnet |
| CN1835340A (en) * | 2006-03-30 | 2006-09-20 | 上海大学 | 'V' type builti-in rotor of permanent megnet dynamo |
| JP2008067474A (en) * | 2006-09-06 | 2008-03-21 | Mitsui High Tec Inc | Rotor |
| CN101958623A (en) * | 2010-06-13 | 2011-01-26 | 上海川邻精密配件有限公司 | High torque density, high power density, low disturbance permanent magnet rotating machine |
| CN102136341A (en) * | 2010-12-30 | 2011-07-27 | 包头稀土研究院 | Anisotropic V-shaped orienting magnet ring |
| CN202260721U (en) * | 2011-10-31 | 2012-05-30 | 上海中科深江电动车辆有限公司 | Internal rotor structure of permanent magnet motor |
| CN102426897A (en) * | 2011-12-20 | 2012-04-25 | 重庆大学 | Semi-elliptical-distributed open nuclear magnetic resonance permanent structure |
| CN102735706A (en) * | 2012-07-18 | 2012-10-17 | 重庆大学 | Nuclear magnetic resonance sensor used for nondestructive aging resonance of umbrella skirt of composite insulator |
| WO2014034344A1 (en) * | 2012-08-31 | 2014-03-06 | 日立オートモティブシステムズ株式会社 | Rotating electric machine |
| CN103219814A (en) * | 2013-04-09 | 2013-07-24 | 沈阳工业大学 | Asynchronous starting permanent magnet synchronous motor rotor based on permanent magnets with different residual magnetic densities |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2016061875A1 (en) | 2016-04-28 |
| CN104299749B (en) | 2016-08-24 |
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