CN209784512U - Constant-temperature nonmagnetic fixture for measuring magnetic moment of permanent magnet and control device thereof - Google Patents
Constant-temperature nonmagnetic fixture for measuring magnetic moment of permanent magnet and control device thereof Download PDFInfo
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- CN209784512U CN209784512U CN201822219529.9U CN201822219529U CN209784512U CN 209784512 U CN209784512 U CN 209784512U CN 201822219529 U CN201822219529 U CN 201822219529U CN 209784512 U CN209784512 U CN 209784512U
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- temperature
- cylinder
- constant
- permanent magnet
- magnetic moment
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- 239000007788 liquid Substances 0.000 claims abstract description 31
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052802 copper Inorganic materials 0.000 claims abstract description 15
- 239000010949 copper Substances 0.000 claims abstract description 15
- 239000007769 metal material Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000523 sample Substances 0.000 abstract description 29
- 239000000463 material Substances 0.000 abstract description 18
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 abstract description 7
- 229910001172 neodymium magnet Inorganic materials 0.000 abstract description 7
- 239000013074 reference sample Substances 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000005245 sintering Methods 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 7
- 150000002910 rare earth metals Chemical class 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
A constant-temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet and a control device thereof comprise a cylinder (1) made of a metal material with a heat conductivity coefficient lower than that of copper and a magnetic conductivity absolute value lower than a preset value; a groove (2) for placing a sample is arranged on the outer surface of the cylinder (1); a temperature control liquid circulation channel (3) is arranged in the cylinder (1); the temperature control liquid circulation channel (3) penetrates through one end of the cylinder to form two through holes on the end face of the cylinder. Above-mentioned technical scheme can satisfy when having the material preparation reference sample of great temperature coefficient to sintering neodymium iron boron etc. to temperature stability's requirement, can also reduce measuring error simultaneously.
Description
Technical Field
The utility model belongs to the electromagnetic measurement field, concretely relates to permanent magnet magnetic moment is measured with constant temperature no magnetism anchor clamps and controlling means thereof.
Background
In recent years, with the rapid growth of consumer electronics, the application of rare earth permanent magnets in consumer electronics is very common. With the increased competition of consumer electronics products, the quality inspection of purchased products by famous brands at home and abroad is more and more strict, taking the products of apple company as an example, permanent magnets used by vibration, cameras, speakers, connectors and the like are purchased by dozens of material manufacturing enterprises in China, the manufacturing enterprises not only carry out the detection of basic magnetic characteristics under a closed magnetic circuit, but also provide the magnetic moment value of a finished magnet, and meanwhile, the purchaser carries out spot inspection on the magnetic moment of the magnet. In addition, the rare earth permanent magnet is widely applied to the field of new energy. In the outline of the national long-term scientific and technical development planning, wind power generation and electric vehicles are respectively listed as the priority subjects of the energy field, rare earth magnetic materials are definitely determined as the development key points of new material strategic emerging industries in the decisions of State institutes on accelerating cultivation and developing strategic emerging industries (the national issue [2012] 32), and the wind power technical equipment level is improved to serve as the key development direction of the new energy industries. Under the large background of energy conservation and low carbon, the application of rare earth permanent magnet materials in the field of new energy sources is wide. The technical conditions of sintered neodymium iron boron magnets for electric vehicles are formulated for the country, the legislation of the national standard of the technical conditions of sintered neodymium iron boron magnets for wind driven generators reports the standard commission, higher performance and detection requirements are provided for the applied rare earth permanent magnet materials in the fields, the uniformity of the materials is used as an important index equal to the basic magnetic characteristic, and sampling and magnetic moment measurement are definite and used as a standard detection method. With the continuous expansion of the application of rare earth permanent magnets in new energy products and the coming of relevant standards, magnetic moment measurement becomes an important quality inspection project of rare earth permanent magnets for new energy industries. The traditional method for measuring the magnetic moment of the permanent magnet is a Helmholtz coil and a fluxmeter, but when the sintered neodymium iron boron is used for manufacturing a reference sample, the temperature coefficient is large.
Instruments on the market now commonly adopt heat conduction copper anchor clamps to heat the sample.
when the heat-conducting copper clamp is used, only a simple function of heating a sample is achieved, and the temperature constant control cannot be realized due to the large temperature conductivity coefficient of copper, so that the temperature change is large; while using a fixture of pure copper material, since the nominal purity of the copper material does not reach a magnetic susceptibility of 10-5To 10-6The requirement of level weak magnetic property, and through research, the condition that the magnetic susceptibility does not reach standard appears in general easily in the copper material on the market, so its actual use effect is not good.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
The utility model aims at providing a sample anchor clamps and controlling means that have control by temperature change liquid circulation function that temperature stability is good and measuring error is little.
(II) technical scheme
in order to solve the above problem, a first aspect of the present invention provides a constant temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet, comprising a cylinder made of a metal material having a thermal conductivity lower than copper and a magnetic conductivity absolute value lower than a predetermined value; a groove for placing a sample is arranged on the outer surface of the cylinder; a temperature control liquid circulation channel is arranged inside the cylinder; the temperature control liquid circulation channel penetrates through one end of the cylinder to form two through holes on the end face of the cylinder.
Further, the central axis of the cylinder is taken as a symmetry line, and the outer surface of the cylinder is provided with two symmetrically arranged plane areas; the plane of the temperature control liquid circulation channel is parallel to the two symmetrically arranged plane areas.
further, the plane of the temperature control liquid circulation channel coincides with the orthographic projection of the two symmetrically arranged plane areas.
Further, the groove is provided on one of the planar areas.
Further, the cylinder comprises a first cylindrical section and a second cylindrical section; the first cylindrical section and the second cylindrical section are coaxially arranged, and the diameter of the second cylindrical section is smaller than that of the first cylindrical section; the planar area is disposed on the first cylindrical section and has a length substantially equal to a length of the first cylindrical section.
Further, a rectangular plane is arranged on the second cylindrical section; and a threaded hole is formed in the rectangular plane.
Further, the length of the rectangular plane is smaller than the length of the second cylindrical section, and the width of the rectangular plane is smaller than the diameter of the second cylindrical section.
Further, the cylinder is made of pure aluminum.
Further, the distance between the two through holes is slightly smaller than the diameter of the cylinder; the diameter of the through hole is 6-10 mm.
Preferably, the diameter of the through hole is 8 mm.
According to the utility model discloses an in another aspect, still provide a permanent magnet magnetic moment measure with controlling means of no magnetism anchor clamps of constant temperature, including a sample anchor clamps, still include: a constant temperature water tank; the constant temperature water tank is communicated with the sample clamp through the two through holes.
(III) advantageous effects
the above technical scheme of the utility model has following profitable technological effect: the cylinder is made of a metal material with the heat conductivity coefficient lower than that of copper, then a groove for placing a sample is formed in the outer surface of the cylinder, a temperature control liquid circulation channel is arranged inside the cylinder, and the temperature control liquid circulation channel penetrates through one end of the cylinder to form two through holes in the end face of the cylinder. Make liquid temperature invariable through the temperature control to control by temperature change liquid to make cylinder surface temperature even and invariable, make the temperature coefficient of sample change little, when satisfying the material preparation reference sample that has great temperature coefficient to sintered neodymium iron boron etc. to temperature stability's requirement, can also reduce measuring error simultaneously.
Drawings
Fig. 1 is a schematic structural view of a constant temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet according to a first embodiment of the present invention;
Fig. 2 is a liquid circulation schematic diagram of a constant temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet according to an embodiment of the present invention.
Reference numerals:
1: a cylinder; 10: a planar area; 11: a first cylindrical section; 12: a second cylindrical section; 120: a rectangular plane; 121: a threaded hole; 2: a groove; 3: a temperature controlled liquid circulation channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example one
Fig. 1 is a structural schematic diagram of a constant temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet according to an embodiment of the present invention.
Fig. 2 is a liquid circulation schematic diagram of a constant temperature non-magnetic clamp for measuring magnetic moment of a permanent magnet according to an embodiment of the present invention.
As shown in figures 1 and 2, the constant-temperature non-magnetic clamp for measuring the magnetic moment of the permanent magnet comprises a structure that the heat conductivity coefficient is lower than that of copper, and the absolute value of the magnetic permeability is lower than a preset value (the absolute value of the magnetic permeability is lower than 10)-4) A cylindrical body 1 made of a metal material; the outer surface of the cylinder 1 is provided with a groove 2 for placing a sample; a temperature control liquid circulation channel 3 is arranged in the cylinder 1; the temperature control liquid circulation channel 3 penetrates through one end of the cylinder to form two through holes on the end surface of the cylinder. The two through holes are respectively used as a temperature control liquid inlet and a temperature control liquid outlet, and are communicated with an external liquid supply device, so that circulation of the temperature control liquid can be realizedThe ring can realize the constant temperature effect of the sample clamp by controlling the temperature inside the liquid supply device, so that the temperature coefficient of the sample cannot be changed too much.
Optionally, the distance between the two through holes is slightly smaller than the diameter of the cylinder; the diameter of the through holes is 6-10mm, preferably 8mm, which enables a more uniform heat conduction.
Preferably, the central axis of the cylinder 1 is taken as a symmetry line, and the outer surface of the cylinder 1 is provided with two symmetrically arranged plane areas 10; the plane of the temperature-controlled liquid circulation channel 3 is parallel to two symmetrically arranged plane areas 10. The planar zone 10 is arranged so that the temperature of the cylinder 1 as a whole remains the same, the whole exhibiting a thermostatic axis.
Further, the plane of the temperature control liquid circulation channel 3 is superposed with the orthographic projection of the two symmetrically arranged plane areas 10. This is designed to allow a more uniform temperature transfer to the entire fixture.
Alternatively, the recess 2 is arranged in one of the planar areas 10. The sample is placed in the well 2 for testing (the circle in the well in fig. 2 represents the sample).
Specifically, the cylindrical body 1 comprises a first cylindrical section 11 and a second cylindrical section 12; the first cylindrical section 11 and the second cylindrical section 12 are coaxially arranged, and the diameter of the second cylindrical section 12 is smaller than that of the first cylindrical section 11; the planar area 10 is arranged on the first cylindrical section 11 and the length of the planar area 10 is substantially equal to the length of the first cylindrical section 11.
Preferably, the cylindrical body 1 is made of pure aluminum.
optionally, a rectangular plane 120 is disposed on the second cylindrical section 12, the length of the rectangular plane 120 is smaller than the length of the second cylindrical section 12, and the width of the rectangular plane 120 is smaller than the diameter of the second cylindrical section 12; the rectangular plane 120 is provided with a threaded hole 121.
Specifically, as shown in fig. 2, the temperature-controlled liquid circulation channel is disposed close to the outer surface of the cylinder, and includes a first circulation channel (disposed close to the side wall of the cylinder), a second circulation channel (disposed close to the end face of the cylinder), and a third circulation channel (disposed close to the other side wall of the cylinder); the first circulation channel, the second circulation channel and the third circulation channel are sequentially connected, the first circulation channel and the third circulation channel are symmetrically arranged by taking the central axis of the cylinder as a symmetry axis to form a rectangle with an opening, and the opening is positioned on one end face of the cylinder to form two through holes.
Example two
The utility model provides a permanent magnet magnetic moment is measured with controlling means of no magnetism anchor clamps of constant temperature, includes a sample anchor clamps, still includes: a constant temperature water tank; the constant temperature water tank is communicated with the sample clamp through two through holes. The temperature change of the final sample can be realized by controlling the temperature of the water in the constant temperature water tank.
The utility model discloses a sample anchor clamps control the temperature through the anchor clamps of circulating liquid to pure aluminium material, and the temperature is surveyed through surface patch thermometer, and the anchor clamps of pure aluminium material pass through face contact with the reference sample and realize temperature control, with the fix with screw. When water in the constant temperature water tank passes through according to the arrow path in fig. 2, the heat is transferred to the constant temperature shaft (cylinder), and the sample block is fixed in the constant temperature shaft (cylinder), so that the constant temperature microenvironment required by the sample is created, and the sample is contacted with the constant temperature shaft, so that the temperature of the sample block can be controlled. The temperature change of the final sample block can be realized by controlling the temperature of water in the constant temperature water tank. Of course, the water in the constant temperature water tank can pass through the constant temperature water tank in the opposite direction of the arrow path in fig. 2, which is not limited by the present invention.
Considering that the sintered neodymium iron boron is used for manufacturing a reference sample and has a larger temperature coefficient, a temperature control index within the range of 20-30 ℃ is designed.
To implement this function, a LAUDA RA8 temperature controller was procured. The working temperature range of the temperature controller is-25-85 ℃, the temperature control precision is +/-0.05 ℃, the heating power is 1.5kW, the cold output is (20 ℃) 225kW, the maximum pressure of a pump is 0.2bar, and the maximum flow of the pump is 15L/min. The temperature controller has larger margin for the temperature control within the range of 20-30 ℃ of the design index.
The invention reduces the error influence on the accurate measurement of the magnetic moment caused by the factors of temperature fluctuation, high magnetic susceptibility and the like caused by adopting pure copper materials.
The beneficial effects of the utility model are that the contrast through temperature controller controlled temperature and sample actual measurement temperature explains below:
TABLE 1 comparison table of temperature controlled by temperature controller and actual measured temperature of sample
| The temperature controller controls the temperature/DEG C | 19.8 | 21.0 | 22.0 | 23.0 | 24.0 | 25.0 |
| measured temperature/. degree.C.of sample | 20.0 | 21.1 | 22.1 | 23.0 | 23.8 | 24.8 |
| The temperature controller controls the temperature/DEG C | 26.0 | 27.0 | 28.0 | 29.0 | 30.0 | 31.2 |
| measured temperature/. degree.C.of sample | 25.5 | 26.4 | 27.3 | 28.1 | 29.0 | 30.0 |
As shown in table 1, through comparison of the above experimental data, it can be seen that, under the temperature condition that the room temperature is relatively close, the temperature of the sample is relatively close to that of the temperature controller, so that the requirement on temperature stability is met when the reference sample is made of materials with relatively large temperature coefficients such as sintered neodymium iron boron, and meanwhile, the measurement error is also reduced.
The utility model discloses at first adopted pure aluminium material to replace pure copper material, eliminated on the one hand because of the too big temperature fluctuation that leads to of material temperature coefficient, on the other hand, because nominal purity's copper product does not reach magnetic susceptibility 10-5To 10-6the requirement of level weak magnetic property is met, and the copper materials in the market are generally easy to have the situation that the magnetic susceptibility does not reach the standard through research, so the actual use effect is poor; secondly, a temperature control liquid circulation channel is arranged in the structure design, constant temperature water is filled in the middle of the temperature control liquid circulation channel to ensure the temperature stability of the constant temperature shaft, and the temperature of the sample is closer to the temperature of the temperature controller under the temperature condition closer to the room temperature through test and test.
Claims (10)
1. A constant-temperature nonmagnetic fixture for measuring magnetic moment of a permanent magnet is characterized by comprising a cylinder (1) made of a metal material with a heat conductivity coefficient lower than that of copper and a magnetic conductivity absolute value lower than a preset value;
A groove (2) for placing a sample is arranged on the outer surface of the cylinder (1);
A temperature control liquid circulation channel (3) is arranged in the cylinder (1);
The temperature control liquid circulation channel (3) penetrates through one end of the cylinder to form two through holes on the end face of the cylinder.
2. The constant-temperature nonmagnetic fixture for measuring the magnetic moment of the permanent magnet according to claim 1,
The central axis of the cylinder (1) is taken as a symmetry line, and the outer surface of the cylinder (1) is provided with two symmetrically arranged plane areas (10);
The plane where the temperature control liquid circulation channel (3) is located is parallel to the two symmetrically arranged plane areas (10).
3. The constant-temperature nonmagnetic fixture for measuring the magnetic moment of the permanent magnet according to claim 2,
The plane where the temperature control liquid circulation channel (3) is located is superposed with the orthographic projection of the two symmetrically arranged plane areas (10).
4. A constant temperature non-magnetic clamp for measuring magnetic moment of permanent magnet according to claim 2, characterized in that the groove (2) is arranged on one of the planar areas (10).
5. the constant-temperature nonmagnetic fixture for measuring the magnetic moment of a permanent magnet according to claim 2, characterized in that the cylinder (1) comprises a first cylindrical section (11) and a second cylindrical section (12);
the first cylindrical section (11) and the second cylindrical section (12) are coaxially arranged, and the diameter of the second cylindrical section (12) is smaller than that of the first cylindrical section (11);
The planar area (10) is arranged on the first cylindrical section (11), and the length of the planar area (10) is approximately equal to the length of the first cylindrical section (11).
6. the constant-temperature nonmagnetic fixture for measuring the magnetic moment of the permanent magnet according to claim 5, wherein the second cylindrical section (12) is provided with a rectangular plane (120); the rectangular plane (120) is provided with a threaded hole (121).
7. The constant-temperature nonmagnetic fixture for measuring the magnetic moment of a permanent magnet according to claim 6, characterized in that the length of the rectangular plane (120) is smaller than the length of the second cylindrical section (12), and the width of the rectangular plane (120) is smaller than the diameter of the second cylindrical section (12).
8. The constant-temperature nonmagnetic fixture for measuring the magnetic moment of a permanent magnet according to claim 1, characterized in that the cylinder (1) is made of pure aluminum.
9. The constant-temperature nonmagnetic fixture for measuring the magnetic moment of the permanent magnet is characterized in that the distance between the two through holes is smaller than the diameter of the cylinder (1);
The diameter of the through hole is 6-10 mm.
10. A control device of a constant temperature nonmagnetic fixture for measuring a magnetic moment of a permanent magnet, comprising the constant temperature nonmagnetic fixture for measuring a magnetic moment of a permanent magnet according to any one of claims 1 to 9, further comprising: a constant temperature water tank;
The constant-temperature water tank is communicated with the constant-temperature nonmagnetic fixture for measuring the magnetic moment of the permanent magnet through the two through holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822219529.9U CN209784512U (en) | 2018-12-27 | 2018-12-27 | Constant-temperature nonmagnetic fixture for measuring magnetic moment of permanent magnet and control device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822219529.9U CN209784512U (en) | 2018-12-27 | 2018-12-27 | Constant-temperature nonmagnetic fixture for measuring magnetic moment of permanent magnet and control device thereof |
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| Publication Number | Publication Date |
|---|---|
| CN209784512U true CN209784512U (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822219529.9U Expired - Fee Related CN209784512U (en) | 2018-12-27 | 2018-12-27 | Constant-temperature nonmagnetic fixture for measuring magnetic moment of permanent magnet and control device thereof |
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| Country | Link |
|---|---|
| CN (1) | CN209784512U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324985A (en) * | 2020-09-25 | 2022-04-12 | 深圳先进技术研究院 | Constant temperature device of chip |
-
2018
- 2018-12-27 CN CN201822219529.9U patent/CN209784512U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114324985A (en) * | 2020-09-25 | 2022-04-12 | 深圳先进技术研究院 | Constant temperature device of chip |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191213 |