CN102253352A - Magnetic leakage factor detecting method and device for magnetic coupling - Google Patents
Magnetic leakage factor detecting method and device for magnetic coupling Download PDFInfo
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- CN102253352A CN102253352A CN2011101014008A CN201110101400A CN102253352A CN 102253352 A CN102253352 A CN 102253352A CN 2011101014008 A CN2011101014008 A CN 2011101014008A CN 201110101400 A CN201110101400 A CN 201110101400A CN 102253352 A CN102253352 A CN 102253352A
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- magnetic
- magnet steel
- air
- field intensity
- leakage factor
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Abstract
The invention relates to a magnetic leakage factor detecting method and device for a magnetic coupling. In the magnetic leakage factor detecting method, firstly, a novel detector is adopted for detecting the air-gap field intensity Hg so as to obtain the value of the air-gap field intensity Hg corresponding to a determined air-gap length Lg; the detector comprises a C-shaped ring yoke, a first magnetic steel, a second magnetic steel, a teslameter probe and a digital display instrument, wherein the first magnetic steel and the second magnetic steel respectively have a tile-shaped flat structure and are used for imitating inner magnetic rotors of the magnetic coupling; the upper arc surface of the first magnetic steel and the lower arc surface of the second magnetic steel are adsorbed on the upper surface and the lower surface of an opening of the C-shaped ring yoke respectively by self-magnetism so as to imitate the structure of the magnetic coupling; the digital display instrument is used for outputting and displaying the data measured by the teslameter probe; and then according to the magnetic circuit Kirchhoff's law and the demagnetization curve function of the magnetic steel, the magnetic leakage factor kf is obtained. The magnetic leakage factor detecting device disclosed by the invention has a simple and practical structure and low manufacturing cost; parts are convenient to process; and data obtained through measurement are accurate and comprehensive.
Description
Technical field
The present invention relates to a kind of magnetic shaft coupling magnetic leakage factor detection method and device, belong to modern magnetics magnetically-actuated field.
Background technology
Magnetic shaft coupling is the basic theories with modern magnetics, and the application magneticaction that permanent magnetic material or electromagnet produced is realized a kind of new technology of non contact transmission moment of torsion.The fundamental difference point of magnetic shaft coupling and machenical coupling is: when magnetic shaft coupling transmits moment of torsion to drive disk assembly, the feed rod discord external world that contacts with medium is connected, but utilizes magnetic field to see through the thin-walled transmitting torque of magnetic circuit working clearance or spacer sleeve.
The structure of magnetic shaft coupling comprises interior magnet rotor and outer magnet rotor as shown in Figure 1.In the design process of magnetic shaft coupling, the maximum magnetostatic moment of torsion of accurate Calculation magnetic shaft coupling is crucial.Wherein, choosing of magnetic leakage factor will directly have influence on the calculating of maximum magnetostatic moment of torsion.Because the gas length between interior magnet rotor and the outer magnet rotor is known, determines gas length Lg and magnetic leakage factor k
fBetween relation just become the important channel that obtains magnetic leakage factor.
In the prior art, adopt special-purpose checkout equipment to detect magnetic shaft coupling air-gap field intensity usually, and then can determine gas length Lg and magnetic leakage factor k
fBetween relation.At present, magnetic shaft coupling checkout facility commonly used, its structure can be measured magnetic shaft coupling air-gap field intensity H as shown in Figure 2
gThis equipment comprises motor, torque speed sensor, magnetic powder brake.During measurement, by motor drives torque speed sensor and the rotation of outer magnet rotor, magnet rotor and magnetic powder brake rotated synchronously in outer magnet rotor drove by the magnetic force coupling, can measure the air-gap field intensity H of magnetic shaft coupling accurately
gBut this equipment cost is too high, and need just can obtain gas length Lg and magnetic leakage factor k by the magnetic shaft coupling measurement of changing different model
fBetween relation.This is promptly uneconomical also impracticable for the test of reality.
Summary of the invention
To the objective of the invention is the too high problem of existing device cost of manufacture of measuring air-gap field intensity in order solving, and to propose a kind of magnetic shaft coupling magnetic leakage factor detection method and device.
The objective of the invention is to be achieved through the following technical solutions.
A kind of magnetic shaft coupling magnetic leakage factor pick-up unit that the present invention proposes comprises: C shape annulus yoke, first magnet steel, second magnet steel, teslameter probe and digital display instrument; Wherein, first magnet steel, second magnet steel are a watt shape flat structure, magnet rotor 1 and outer magnet rotor 2 in being used to simulate; C shape annulus yoke is C shape circular ring structure (diameter of C shape annulus endoporus is controlled at 10mm～15mm, and carbon content is controlled between 0.08%～0.1% in its material), and the size of its opening part will guarantee first magnet steel, second magnet steel are encased fully; Digital display instrument is used for the data output of teslameter probe measurement is shown.
Annexation between the above-mentioned ingredient is: the last cambered surface of first magnet steel, the lower camber side of second magnet steel are all utilized the magnetic of self, are adsorbed on respectively on the upper and lower surface of C shape annulus yoke opening part, are used to simulate the structure of magnetic shaft coupling device; One end of teslameter probe stretches between first magnet steel and second magnet steel, is used to detect the air-gap field intensity Hg of air gap Lg between two magnet steel, and the other end is connected with digital display instrument, and output test data obtains the value of air gap magnetic field intensity Hg under this gas length Lg.
The present invention also can realize changing the size of gas length Lg by adopting the C shape annulus yoke of different openings size, thereby obtains the corresponding down air-gap field intensity Hg value of different air gap length L g.
A kind of application device of the present invention detects magnetic shaft coupling magnetic leakage factor method, may further comprise the steps:
The first step, detect air-gap field intensity Hg, obtain the air-gap field intensity Hg value of determining that gas length Lg is corresponding down with device of the present invention.
Second the step, according to the detected air-gap field intensity of first step Hg, obtain magnetic leakage factor k
fMethod is as follows:
According to the magnetic circuit Kirchhoff's law:
B
mA
m＝k
fB
gA
g 1.1
H
mL
m＝k
rH
gL
g 1.2
And magnet steel demagnetizing curve function:
B＝B
r-μ
0H 1.3
In the formula 1.1,1.2,1.3, A
mBe magnet steel average cross-section, A
gFor the cross-section of air gap is long-pending, L
mBe magnet thickness, L
gBe gas length, be known dimensions; Reluctancy k
r, magnet steel remanent magnetism B
r, permeability of vacuum μ
0Be known parameters; B is a magnetic induction density, and H is a magnetic field intensity.In air, gap density B
g=air-gap field intensity H
gCan calculate magnetic leakage factor k thus
f
Beneficial effect
Pick-up unit of the present invention adopts C shape annulus monolithic construction, and simple in structure, practical, cost of manufacture is low, part easy to process.By changing C shape annulus yoke, can realize changing the size of gas length Lg, obtain gas length Lg and magnetic leakage factor k by detection
fBetween relation.
The data that measure accurately, comprehensively.No matter be the design magnetic shaft coupling, still detect existing magnetic shaft coupling performance, all Shi Fen convenience, economy.
Description of drawings
Fig. 1 is a magnetic shaft coupling structural drawing in the prior art;
Fig. 2 is the structural drawing of magnetic shaft coupling pick-up unit in the prior art;
Fig. 3 is a pick-up unit structural drawing of the present invention;
Fig. 4 is first magnet steel in the pick-up unit of the present invention, second magnet steel and C shape annulus yoke opening part connection diagram;
Wherein: magnet rotor, the outer magnet rotor of 2-, 3-motor, 4-torque speed sensor, 5-magnetic powder brake, 6-C shape annulus yoke, 7-first magnet steel, 8-second magnet steel, 9-teslameter probe, 10-digital display instrument in the 1-.
Concrete embodiment
The present invention is described further below in conjunction with drawings and Examples:
Embodiment
In the pick-up unit of present embodiment, first magnet steel 7, second magnet steel, the 8 average cross-section A that are adopted
m=425mm
2, the cross-section of air gap amasss A
g=500mm
2, magnet thickness L
m=7mm, reluctancy k
r=11, magnet steel remanent magnetism B
r=1.236T, permeability of vacuum μ
0=4 π * 10
-7The diameter of C shape annulus endoporus is 12mm, and carbon content is controlled at 0.08% in its material.Gas length L
gGet 2mm, 4mm, 6mm respectively.
The first step, the air-gap field intensity Hg that adopts 9 detections of teslameter probe to obtain are respectively 8.55Koe, 7.07Koe, 6.09Koe.
Second one, according to magnetic circuit Kirchhoff's law: B
mA
m=k
fB
gA
g, H
mL
m=k
rH
gL
g, and magnet steel demagnetizing curve function B=B
r-μ
0H calculates magnetic leakage factor k
fBe respectively 1.1,1.2,1.3.
By the magnetic leakage factor that detection obtains,, can calculate the maximum magnetostatic moment of torsion of magnetic shaft coupling in conjunction with the design size of magnetic shaft coupling.
Claims (3)
1. magnetic shaft coupling magnetic leakage factor detection method is characterized in that may further comprise the steps:
The first step, detection air-gap field intensity Hg obtain the air-gap field intensity level Hg that determines that gas length Lg is corresponding down;
Second the step, according to the detected air-gap field intensity of first step Hg, obtain magnetic leakage factor k
f, method is as follows:
According to the magnetic circuit Kirchhoff's law:
B
mA
m＝k
fB
gA
g 1.1
H
mL
m＝k
rH
gL
g 1.2
And magnet steel demagnetizing curve function:
B＝B
r-μ
0H 1.3
In the formula 1.1,1.2,1.3, magnet steel average cross-section A
m, the long-pending A of the cross-section of air gap
g, magnet thickness L
m, gas length L
gBe known dimensions; Reluctancy k
r, magnet steel remanent magnetism B
r, permeability of vacuum μ
0Be known parameters; B is a magnetic induction density, and H is a magnetic field intensity; In air, gap density B
g=air-gap field intensity H
gCan calculate magnetic leakage factor k thus
f
2. a magnetic shaft coupling magnetic leakage factor pick-up unit is characterized in that comprising C shape annulus yoke (6), first magnet steel (7), second magnet steel (8), teslameter probe (9) and digital display instrument (10);
Wherein, first magnet steel (7), second magnet steel (8) are a watt shape flat structure; C shape annulus yoke (6) is a C shape circular ring structure, and the size of its opening part will guarantee first magnet steel (7), second magnet steel (8) are encased fully; The data output that digital display instrument (10) is used for teslameter probe (9) is measured shows;
Annexation between the above-mentioned ingredient is: the lower camber side of the last cambered surface of first magnet steel (7), second magnet steel (8) is all utilized the magnetic of self, is adsorbed on the upper and lower surface of C shape annulus yoke (6) opening part respectively, the structure of simulation magnetic shaft coupling device; One end of teslameter probe (9) gos deep between first magnet steel (7) and second magnet steel (8), be used to detect the air-gap field intensity Hg of air gap Lg between two magnet steel, the other end is connected with digital display instrument (10), output test data, thus obtain the value of air gap magnetic field intensity Hg under this gas length Lg;
By adopting the C shape annulus yoke (6) of different openings size, realize changing the size of gas length Lg, thereby obtain the corresponding down air-gap field intensity Hg value of different air gap length L g.
3. a kind of magnetic shaft coupling magnetic leakage factor pick-up unit as claimed in claim 2, it is characterized in that: the diameter of bore of described C shape annulus yoke (6) is controlled at 10mm～15mm, and carbon content is controlled between 0.08%～0.1% in its material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101014008A CN102253352A (en) | 2011-04-22 | 2011-04-22 | Magnetic leakage factor detecting method and device for magnetic coupling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101014008A CN102253352A (en) | 2011-04-22 | 2011-04-22 | Magnetic leakage factor detecting method and device for magnetic coupling |
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| CN102253352A true CN102253352A (en) | 2011-11-23 |
Family
ID=44980719
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| CN2011101014008A Pending CN102253352A (en) | 2011-04-22 | 2011-04-22 | Magnetic leakage factor detecting method and device for magnetic coupling |
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| CN (1) | CN102253352A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458246A (en) * | 2014-11-06 | 2015-03-25 | 江苏大学 | Liquid magnetism coherence and power transmission characteristic study testing device of magnetic drive pump |
| CN108490376A (en) * | 2018-04-26 | 2018-09-04 | 宁波兴茂电子科技有限公司 | A kind of rotary magnet torsion-testing tooling and its operating method |
| CN111190128A (en) * | 2018-11-15 | 2020-05-22 | 北京自动化控制设备研究所 | Detection algorithm for BH characteristics of ferromagnetic material of reluctance motor |
| CN114263622A (en) * | 2021-12-30 | 2022-04-01 | 浙江启尔机电技术有限公司 | Magnetic coupling online monitoring system and method and magnetic pump adopting same |
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| CN1121801A (en) * | 1994-08-16 | 1996-05-08 | 王魁武 | Permanent magnet for high uniformity vortex-free plate type NMR imaging instrument |
| CN101699310A (en) * | 2009-10-28 | 2010-04-28 | 哈尔滨工业大学 | Device for measuring flux density value of practical air gap field of magnetic steel in electric appliance |
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2011
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1121801A (en) * | 1994-08-16 | 1996-05-08 | 王魁武 | Permanent magnet for high uniformity vortex-free plate type NMR imaging instrument |
| CN101699310A (en) * | 2009-10-28 | 2010-04-28 | 哈尔滨工业大学 | Device for measuring flux density value of practical air gap field of magnetic steel in electric appliance |
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|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458246A (en) * | 2014-11-06 | 2015-03-25 | 江苏大学 | Liquid magnetism coherence and power transmission characteristic study testing device of magnetic drive pump |
| CN104458246B (en) * | 2014-11-06 | 2017-04-05 | 江苏大学 | Magnetic force pump liquid magnetic is concerned with and power transmission characteristic research assay device |
| CN108490376A (en) * | 2018-04-26 | 2018-09-04 | 宁波兴茂电子科技有限公司 | A kind of rotary magnet torsion-testing tooling and its operating method |
| CN111190128A (en) * | 2018-11-15 | 2020-05-22 | 北京自动化控制设备研究所 | Detection algorithm for BH characteristics of ferromagnetic material of reluctance motor |
| CN111190128B (en) * | 2018-11-15 | 2022-10-18 | 北京自动化控制设备研究所 | Detection algorithm for BH characteristics of ferromagnetic material of reluctance motor |
| CN114263622A (en) * | 2021-12-30 | 2022-04-01 | 浙江启尔机电技术有限公司 | Magnetic coupling online monitoring system and method and magnetic pump adopting same |
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Inventor after: Li Jiahu Inventor after: Xu Heng Inventor after: Wan Renwei Inventor after: Ren Lina Inventor after: Zhu Juntao Inventor after: Song Yin Inventor after: Zhang Huaiwu Inventor before: Xu Heng Inventor before: Li Jiahu Inventor before: Wan Renwei |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: XU HENG LI JIAHU WAN RENWEI TO: LI JIAHU XU HENG WAN RENWEI REN LINUO ZHU JUNTAO SONG YIN ZHANG HUAIWU |
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Application publication date: 20111123 |