CN204925365U - Biproduct point -score bold permanent magnet can't harm measuring device based on embedding coil - Google Patents
Biproduct point -score bold permanent magnet can't harm measuring device based on embedding coil Download PDFInfo
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- CN204925365U CN204925365U CN201520501443.9U CN201520501443U CN204925365U CN 204925365 U CN204925365 U CN 204925365U CN 201520501443 U CN201520501443 U CN 201520501443U CN 204925365 U CN204925365 U CN 204925365U
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- coil
- measuring
- measuring coil
- magnetic
- cartridge
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Abstract
The utility model discloses a biproduct point -score bold permanent magnet can't harm measuring device based on embedding coil. The electro -magnet is connected to movable cartridge and fixed cartridge, and a measuring coil and the 2nd measuring coil have been inlayed respectively to the both sides of fixed cartridge, are surveyed the sample to place in on a measuring coil or the 2nd measuring coil, a measuring coil and the 2nd measuring coil are connected with respective magnetic flux meter, and the electro -magnet is connected with the field power supply, and field power supply and magnetic flux meter be respectively through DA converter, AD converter and computer link, and on -off controller connects the DA converter and carries out change over switch with the AD converter and control. The utility model discloses a two magnetic flows meter, test repeatability and good in existing nature, artificial deviation is little, adopt embedded coil, avoided taking time in the sample process, hard, expense material scheduling problem, realize the nondestructive measurement, application prospect is wide in the magnetic material production and application trade to can bring great economy and social to magnetic material manufacturing enterprise.
Description
Technical field
The utility model relates to magnetic material magnetic energy technical field of measurement and test, especially relate to a kind of based on embedding the double integration method bulk permanent magnet damage-free measuring apparatus of coil, can be used for the permanent magnetic material magnetism of material such as permanent-magnet ferrite, aluminium nickel cobalt can nondestructive measurement and the calibration of relevant criterion material and calibrating.
Background technology
Permanent magnetic material magnetic property is mainly by measuring material at the magnetic induction density B of the second quadrant and polarization intensity J, and the demagnetization relation curve between the H of magnetic field obtains remanent magnetism B
r, coercive force H
cB, HCJ H
cJ, maximum magnetic energy product (BH)
maxcharacterize Deng characteristic parameter.Wherein J-H curve is the important curve of the intrinsic performance of outstanding reflection permanent magnetic material.
Prior art adopts the measurement of standard bipolar head to measure, as shown in Figures 2 and 3, adopt B coil measurement magnetic flux, gaussmeter configuration hall probe 9 is adopted to test gap magnetic field H, major defect has: adopt B coil to measure, need at measurement sample middle part coiling, degree of tightness and the coiling flatness of coil all can affect measurement result.If adopt hall probe 9 to measure, the verticality of hall probe position and placement can impact measurement result equally, especially can affect H
cjthe Measurement accuracy of value.The repeatability measured is difficult to be guaranteed.
Utility model content
In order to solve Problems existing in background technology, the utility model object is to provide a kind of double integration method bulk permanent magnet damage-free measuring apparatus based on embedding coil, test coil (B coil or J coil) is adopted to be directly embedded into inside cartridge, be the method for embedded coil, to realize the nondestructive measurement to permanent magnetic material magnetic property.
Above-mentioned purpose of the present utility model is achieved, mainly through following technical scheme:
The utility model comprises field power supply, magnetic-flux meter, electromagnet, movable cartridge, the first measuring coil, sample, the second measuring coil and fixing cartridge, movable cartridge is connected electromagnet with fixing cartridge, the both sides of fixing cartridge are embedded with the first measuring coil and the second measuring coil respectively, and sample is placed on the first measuring coil or the second measuring coil; First measuring coil is connected with respective magnetic-flux meter with the second measuring coil, electromagnet is connected with field power supply, field power supply and magnetic-flux meter are connected with computing machine through D/A converter, A/D converter respectively, and on-off controller connects D/A converter and A/D converter carries out switch control.
The first described measuring coil is for measuring J coil or measuring B coil, and the second described measuring coil is for measuring H coil.
The first described measuring coil and the second measuring coil open a sluice gate to embed along direction of magnetization.
The first described measuring coil and the second measuring coil rounded.
The first described measuring coil is all identical with area coil A with the effective turn N of the second measuring coil, and two coil differential concatenations.
The useful effect that the utility model has is:
The utility model adopts two fluxmeter, the magnetic polarization J value of test sample and magnetic field intensity H value, and test J value area coil is fixed, and test H value area coil is fixed; Well, people is that the measured deviation caused is little for test repeatability and repeatability.
The utility model has a extensive future in magnetic materials production and application industry, and can bring larger economic and social benefit to magnetic material manufacturing enterprise.
Accompanying drawing explanation
Fig. 1 is the experiment curv schematic diagram of measuring principle.
Fig. 2 is the system diagram of existing employing B-H measuring coil.
Fig. 3 is the system diagram of existing employing J-H measuring coil.
Fig. 4 is structural representation of the present utility model.
Fig. 5 is that the utility model adopts cartridge to embed the schematic diagram of coil measurement.
Fig. 6 is the demagnetizing curve figure that embodiment adopts classic method acquisition.
Fig. 7 is the demagnetizing curve figure that embodiment adopts the inventive method to obtain.
In figure: 1, electromagnet, 2, movable cartridge, the 3, first measuring coil, 4, sample, the 5, second measuring coil, 6, fixing cartridge.
Embodiment
Below in conjunction with drawings and the specific embodiments, the utility model is described in further detail.
As shown in Figure 4, the utility model comprises field power supply, magnetic-flux meter, electromagnet 1, movable cartridge 2, first measuring coil 3, sample 4, second measuring coil 5 and fixing cartridge 6, movable cartridge 2 is connected electromagnet 1 with fixing cartridge 6, the both sides of fixing cartridge 6 are embedded with the first measuring coil 3 and the second measuring coil 5 respectively, and sample 4 is placed on the first measuring coil 3 or the second measuring coil 5; First measuring coil 3 is connected with respective magnetic-flux meter with the second measuring coil 5, electromagnet 1 is connected with field power supply, field power supply and magnetic-flux meter are connected with computing machine through D/A converter, A/D converter respectively, and on-off controller connects D/A converter and A/D converter carries out switch control.
First measuring coil 3 is for measuring J coil or measuring B coil, and the second described measuring coil 5 is for measuring H coil.According to the difference of measuring object, first, second test coil correlation parameter can be designed, as wire circle, resistance value, determine the wire diameter that measuring coil adopts, and determine embedded location and the embedded mode of coil.First measuring coil 3 and the second measuring coil 5 open a sluice gate to embed along direction of magnetization, or measuring coil are embedded in cartridge by other modes.
First measuring coil 3 and the second measuring coil 5 rounded.First measuring coil 3 is all identical with area coil A with the effective turn N of the second measuring coil 5, and two coil differential concatenations.
According to the difference of measuring object, the material of sample is different, as ferrite, aluminium nickel cobalt etc., and the shape size of sample is different, different test coil parameters can be designed, as the wire diameter that wire circle, measuring coil area, coil adopt, and determine position and the embedded mode of the embedding cartridge of measuring coil, as: measurement J coil and measurement B coil are opened a sluice gate to embed movable cartridge 2 along direction of magnetization.Then place and mobile sample 4 measure to correct position, the position of placement can adjust according to the different parts of measurement target.
The utility model adopts embedded coil, directly coil is embedded into cartridge, the magnetic field only measuring magnet privileged site particular area can be realized, can directly test on magnet, making standard sample without the need to carrying out sampling cutting to magnet, time-consuming in sampling process, effort, various problem such as expense material etc. can be avoided.The utility model, without the need to sampling, directly can be measured by mobile sample 4, realize nondestructive measurement.
The utility model is owing to being embedded coil, therefore coil is fixed.As long as after being determined by some coefficients of coil, adopt same coil to the measurement of magnet, this avoid tester when coil winding or coil placement location time the human factor that causes on the impact of measurement result.Just there is not the problem of coil thickness in embedded coil, can realize the Performance Detection to ultrathin products.The utility model can measure the diverse location of same magnet, thus can research and analyse the homogeneity of same magnet.
Embodiment of the present utility model and implementation process as follows:
First measuring coil 3 and the second measuring coil 5 adopt J coil and H coil combination to measure respectively, during measurement, electromagnet produces a reversed magnetic field increased gradually, measurement mechanism can record the numerical value of magnetic field intensity H and sample polarization intensity J in this process, obtain J-H curve (curve 2 as in Fig. 1), then pass through formula: B=μ
0h+J calculates BH curve (curve 1 as in Fig. 1), and wherein B is magnetic induction density, and J is polarization intensity, μ
0for permeability of vacuum, be a magnetic constant, its value equals 4 π × 10
-7prosperous every meter;
Finally by calculating measurement eigenwert to two curves, comprise remanent magnetism B
r, coercive force H
cb, HCJ H
cj, maximum magnetic energy product (BH)
maxetc..
HCJ H
cjaccording to magnetic field H at sample 4 and cartridge, in the continuity of tangential direction on this two media, double integrator mode is adopted to test the magnetic field of the second measuring coil 5 correspondence and calculate.B
rvalue is obtained by the local demagnetization curved measurement of sample, needs geometric configuration per sample to carry out parameters revision by modeling analysis.
Adopt if same B coil and H coil combination to measure, first can obtain BH curve, then also by formula B=μ
0h+J calculates J-H curve, finally calculates measurement eigenwert.
Concrete enforcement adopts cartridge coil ratio juris, is to make use of the embedding coil measurement magnetic strength B value be placed under sample, utilizes the coil measurement H value of sample exterior, as Fig. 5.According to the compensation air gap mode that standard IEC 60404-4 recommends, adopt coaxial or out-of-alignment two test coils, coil satisfies condition:
N
1*S
1＝N
2*S
2
Wherein, N
1and N
2represent the effective turn of the first coil and the second coil respectively, A
1and A
2represent the area coil of the first coil and the second coil respectively.
Be S for area
0sample, adopt coaxial coil carry out reversal connection, the effective turn of coil:
n＝N
1-N
2
Wherein, n represents the effective turn that two coils are total.
The magnetic flux detected:
Wherein, J is magnetic polarization, is embedded into the coil of cartridge, and the coil winding adopting two complete numbers of turn the same is at diameter A
0pure iron iron core on, be embedded in cartridge according to special process, be ensure magnetic field's regularity, it is the smaller the better to inlay gap.
According to the magnetic flux principle of continuity, to the magnetic flux of pure iron iron core be passed and be placed on the magnetic flux equivalence (physical presence deviation) of the permanent-magnet ferrite correspondence position above coil, another compensating coil not covering permanent-magnet ferrite sample is played a reversed role, revise deviation as much as possible, condition meets:
N＝N
B＝N
H
A＝A
B＝A
H
Wherein, N
band N
hrepresent the effective turn of B coil and H coil respectively, A
band A
hrepresent the area coil of B coil and H coil respectively.
Test corresponding magnetic flux
for:
Magnetization curve or demagnetizing curve can be obtained.
Embodiment is for L60mm × W30mm × H5mm square ferrimagnet, have employed existing standard law and carry out the accurate magnetic parameter value that repetitive measurement obtains magnet, standard law sampling sample size is L19.92mm × W10.06mm × H5.23mm, and its demagnetizing curve as shown in Figure 6; Carry out correction in the utility model and repeatedly test, select to adopt the test of H coil integration method, input " H coil turn " (40 circle) and " H area coil ", consider the effective diameter of coil, modified line loop diameter is 8.25mm, revise H coil single turn area 52mm2, demagnetizing curve as shown in Figure 7.The test result data specifically obtained is as follows:
The comparison of table 1 test data
| 3# sample | Br(T) | Hcb(kA/m) | Hcj(kA/m) | BHmax(kJ/m 3) |
| J coil standard law | 0.3959 | 279.7 | 288.5 | 30.19 |
| Embed coil measurement | 0.3962 | 282.6 | 289.5 | 30.20 |
| Deviation | 0.09％ | 0.10％ | 0.34％ | 0.03％ |
Visible in data, the utility model adopts two fluxmeter can realize the accurate nondestructive measurement of bulk permanent magnet, and well, people is that the measured deviation caused is little for test repeatability and repeatability, have significant technique effect, magnetic materials production and application industry have a extensive future.
Above-mentioned embodiment is used for explaining and the utility model is described; instead of the utility model is limited; in the protection domain of spirit of the present utility model and claim, any amendment make the utility model and change, all fall into protection domain of the present utility model.
Claims (5)
1. the double integration method bulk permanent magnet damage-free measuring apparatus based on embedding coil, comprise field power supply, magnetic-flux meter, electromagnet (1), movable cartridge (2), first measuring coil (3), sample (4), second measuring coil (5) and fixing cartridge (6), it is characterized in that: movable cartridge (2) is connected electromagnet (1) with fixing cartridge (6), the both sides of fixing cartridge (6) are embedded with the first measuring coil (3) and the second measuring coil (5) respectively, sample (4) is placed on the first measuring coil (3) or the second measuring coil (5), first measuring coil (3) is connected with respective magnetic-flux meter with the second measuring coil (5), and electromagnet (1) is connected with field power supply.
2. a kind of double integration method bulk permanent magnet damage-free measuring apparatus based on embedding coil according to claim 1, it is characterized in that: described the first measuring coil (3) is for measuring J coil or measuring B coil, and described the second measuring coil (5) is for measuring H coil.
3. a kind of double integration method bulk permanent magnet damage-free measuring apparatus based on embedding coil according to claim 1, is characterized in that: described the first measuring coil (3) and the second measuring coil (5) open a sluice gate to embed along direction of magnetization.
4. according to claim 1 a kind of based on embedding the double integration method bulk permanent magnet damage-free measuring apparatus of coil, it is characterized in that: described the first measuring coil (3) and the second measuring coil (5) rounded.
5. a kind of double integration method bulk permanent magnet damage-free measuring apparatus based on embedding coil according to claim 1, it is characterized in that: described the first measuring coil (3) is all identical with area coil A with the effective turn N of the second measuring coil (5), and two coil differential concatenations.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520501443.9U CN204925365U (en) | 2015-07-10 | 2015-07-10 | Biproduct point -score bold permanent magnet can't harm measuring device based on embedding coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520501443.9U CN204925365U (en) | 2015-07-10 | 2015-07-10 | Biproduct point -score bold permanent magnet can't harm measuring device based on embedding coil |
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|---|---|
| CN204925365U true CN204925365U (en) | 2015-12-30 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974336A (en) * | 2016-05-04 | 2016-09-28 | 中国计量大学 | Method of detecting saturation magnetic induction intensity of magnetic powder core |
| CN109407023A (en) * | 2018-08-29 | 2019-03-01 | 宁波市计量测试研究院（宁波市衡器管理所、宁波新材料检验检测中心） | A kind of novel calibration method of magnetic moment (magnetic flux) tester |
-
2015
- 2015-07-10 CN CN201520501443.9U patent/CN204925365U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974336A (en) * | 2016-05-04 | 2016-09-28 | 中国计量大学 | Method of detecting saturation magnetic induction intensity of magnetic powder core |
| CN105974336B (en) * | 2016-05-04 | 2018-09-07 | 中国计量大学 | A kind of detection method of powder core saturation induction density |
| CN109407023A (en) * | 2018-08-29 | 2019-03-01 | 宁波市计量测试研究院（宁波市衡器管理所、宁波新材料检验检测中心） | A kind of novel calibration method of magnetic moment (magnetic flux) tester |
| CN109407023B (en) * | 2018-08-29 | 2021-02-19 | 宁波市计量测试研究院（宁波市衡器管理所、宁波新材料检验检测中心） | Calibration method of magnetic moment tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20160710 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |