CN102623133B - A kind of method for Sintered NdFeB magnet multipole magnetization - Google Patents
A kind of method for Sintered NdFeB magnet multipole magnetization Download PDFInfo
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- CN102623133B CN102623133B CN201110032100.9A CN201110032100A CN102623133B CN 102623133 B CN102623133 B CN 102623133B CN 201110032100 A CN201110032100 A CN 201110032100A CN 102623133 B CN102623133 B CN 102623133B
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- magnetizing
- coil
- magnetization
- clamp
- magnetize
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- 230000005415 magnetization Effects 0.000 title claims abstract description 30
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 19
- 230000005405 multipole Effects 0.000 title claims abstract description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052802 copper Inorganic materials 0.000 claims abstract description 16
- 239000010949 copper Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011162 core material Substances 0.000 claims abstract description 4
- 230000004907 flux Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 210000000088 Lip Anatomy 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N Neodymium Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000001808 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- -1 neodymium iron boron Chemical compound 0.000 description 1
- 230000000630 rising Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Abstract
A kind of method for Sintered NdFeB magnet multipole magnetization, it is characterized in that: make a pair traditional magnetizing clamp arrange Face to face, shuttle plate is arranged between this pair magnetizing clamp, the width of shuttle plate is identical with the width of each magnetizing clamp pure iron core, one magnetizing clamp is connected with the positive pole of power supply, and another one magnetizing clamp is connected with the negative pole of power supply；Product to be filled is put in the shuttle plate that non-magnet_conductible material is made fixing, then, one group of cartridge is shared, by pulsed field magnetization corona discharge, magnetize to body to be magnetized, described magnetizing coil is the coil that many and every layers of number of turn of the number of plies are few, and every layer of number of turn and described magnetizing coil iron core magnetization saturation voltage adapt；Select the thickest copper cash；The iron core material of described magnetizing coil is ingot iron, described in the magnetize material of cartridge be pure iron.The present invention is selected by the setting of magnetizing coil key parameter and the cartridge material that magnetizes, on the premise of ensureing that magnet is saturated and magnetizing, improves the effect that magnetizes of coil.
Description
Technical field
The present invention relates to a kind of method for Sintered NdFeB magnet multipole magnetization.
Background technology
Multipole magnetization is the magnetization method carrying out two pairs of magnetic poles on same Sintered NdFeB magnet, and the method is one and relates to
And to multiple factors, more complicated professional technique, it is relevant to the magnetic characteristic of magnetize cartridge and sintered NdFeB.At present, right
The neodymium iron boron magnetic body method used that magnetizes is pulsed magnetic field magnetization method, and the principle of this magnetization method carries out wink for utilizing big electric current
Between discharge to produce impulse magnetic field, thus permanent magnet is magnetized.In view of the seriality magnetized, to shorten as far as possible fill
The time of pulse front edge in magnetic circuit.
In general, when magnetizing permanent magnet, the magnetic field intensity suffered by magnet should be greater than the HCJ of permanent magnet
(HCJ).The intensity in magnetic field to be improved is it is necessary to improve the current intensity of pulsed field magnetization, from Ohm's law, when filling
Magnetomechanical increases, after determining with the cartridge that magnetizes, the voltage that magnetizes, and i.e. can reach this purpose.
The classification magnetized has: 1) according to being magnetized the shape of body and requiring to distinguish, be divided into one pole to magnetize, multipole magnetization etc.
Deng.Being generally used for the device that permanent magnet magnetizes mainly has electric magnet, coil or solenoid and solid conductor etc. several；2) basis
The difference of current waveform, can be divided into Permanent current magnetic field to magnetize and impulse current magnetic field magnetizes two kinds.Constant current produces
Stable magnetic field, but magnetic field intensity is the highest；The magnetic field intensity that pulse current produces is high, but caloric value is the highest, and the Lip river produced therewith
Lun Zili is the biggest.
Multi-pole coils is it should be ensured that the demand of various highly difficult multipole magnetization.The design of magnetizing coil it should be ensured that coil with
Magnet charger electric capacity, and the optimal coupling of electric current etc..
Currently used magnetizing clamp have can not scalability, the effect that magnetizes have no idea correct, therefore, compel to be essential in market
The magnetizing clamp of the finished goods that sintered NdFeB to be suitable for produces, to be effectively improved the effect that magnetizes of magnet, makes magnetizing of magnet
Performance is effectively improved.
According to the traditional magnetizing clamp shown in Fig. 1, pure iron cartridge is represented by 1, outer around insulated copper wire at insulated hollow cavity
2, add pulse current and just produce magnetic field, reach the effect making magnet magnetize.
In general, as in figure 2 it is shown, the one side of tradition charged magnet is N pole, another side is S pole, has both been one side one pole
Type.
At present, inventor does not the most retrieve any patent documentation about two-sided bipolar magnetizing clamp, does not the most find
The structure report of fixed mode two-sided bipolar magnet.
Summary of the invention
It is an object of the invention to provide a kind of method for Sintered NdFeB magnet multipole magnetization, closed by magnetizing coil
The setting of bond parameter and the cartridge material that magnetizes selected, on the premise of ensureing that magnet is saturated and magnetizing, improves magnetizing of coil
Effect.
To this end, the invention provides a kind of method for Sintered NdFeB magnet multipole magnetization, it is characterised in that: make biography
A pair magnetizing clamp of system is arranged Face to face, and shuttle plate is arranged between this pair magnetizing clamp, and the width of shuttle plate is with every
The width of individual magnetizing clamp pure iron core is identical, and a magnetizing clamp is connected with the positive pole of power supply, another one magnetizing clamp and electricity
The negative pole in source connects；Product to be filled is put in the shuttle plate that non-magnet_conductible material is made fixing, then, one group of cartridge is shared,
By pulsed field magnetization corona discharge, magnetizing to body to be magnetized, described magnetizing coil is the coil that many and every layers of number of turn of the number of plies are few, every layer
The number of turn and described magnetizing coil iron core magnetization saturation voltage adapt；Select the thickest copper cash；The ferrum of described magnetizing coil
Core matter is ingot iron, described in the magnetize material of cartridge be pure iron.
Preferably, the material of cartridge of magnetizing described in is electrical pure iron.
Preferably, a diameter of Ф 1.0-1.5mm of the copper cash used by described magnetizing coil.
Preferably, the electric current that magnetizes of described magnetizing coil is 8-20KA.
Preferably, magnet to be magnetized is the magnet at more than the two poles of the earth.
Preferably, described magnetizing coil is two-sided bipolar magnetizing coil.
The number of plies is more, every layer of less coil of the number of turn by selecting for the present invention, in connected applications from reduce applied voltage and
Electric current considers, every layer of number of turn to adapt with iron core magnetization saturation voltage.Therefore, in actual applications, for radiation magnetic loop, adopt
, the every layer number of turn less coil more by the number of plies, it is possible to make magnet reach saturated in the case of small voltage, electric current and magnetize.
The present invention is by selecting the coil with magnet ring external diameter same size, and the inductance produced when magnetizing is less, makes eddy current magnetic
Field is easier to infiltrate into core center, by iron core magnetic saturation.
The present invention is by selecting the thickest copper cash, big compared with thick copper lines peak point current when magnetizing, wherein preferred diameter
It is optimal for 1-1.5mm copper cash.
Pure iron magnetic conduction magnetic grips the penetrance that can increase the magnetic line of force, and the present invention, by selecting pure iron cartridge, makes the magnetic line of force more
How gripped the loop of formation through magnet by magnetic, reduce the magnetic line of force number being internally formed loop at magnet, make magnet magnetized
The radial direction rate in direction increases.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the magnetizing clamp according to prior art.
Fig. 2 is the schematic diagram of traditional one side monopole type charged magnet.
Fig. 3 is the structure principle chart of the two-sided ambipolar charged magnet fixture according to the present invention.
Fig. 4 is the schematic diagram of typical two-sided ambipolar charged magnet.
Fig. 5 is another structure principle chart according to the two-sided ambipolar charged magnet fixture of the present invention.
Detailed description of the invention
As illustrated in figures 4-5, according in the two-sided ambipolar charged magnet fixture of the present invention, 1,1 ' represents pure iron core；3、
3 ' represent one group of cartridge；20 represent copper coil；2,2 ' represent connection power cathode and the copper cash of positive pole respectively；5 represent shuttle
Plate；6 represent product to be magnetized.At the external power supply that magnetizes of fixture, produce pulse current, can disposably make magnet multipole magnetic.
Product 6 to be filled is put in shuttle plate 5 fixing, and the material of shuttle plate 5 is non-magnetic any machinable material, shuttle
The width of daughter board 5 is identical with pure iron core 1,1 ', then one group of cartridge 3,3 ' is shared, and by pulsed field magnetization corona discharge, is waited to fill
Magnet 6 magnetizes, and can realize multipole magnetization.Multipole product is two-sided bipolar, as shown in Figure 4.
Magnetize saturation voltage about every layer of number of turn and magnetizing coil iron core to adapt, the two-sided bipolar fixture of specific design
Time, the inductance of fixture to be considered, the correlative factor such as resistance, substantially determine by equation below: H=I/ (2r π), wherein, I is
Pulse current intensity (A), r is the space point distance (m) to current carrying conductor, and H is magnetic field intensity.If the circle of the design of fixture
Number, line footpath selects unreasonable, then due to pressure not, it is impossible to improved the intensity of pulse current by improving magnitude of voltage.
The most following formula of peak point current in coil
In formula
U0Initial voltage；
L coil inductance；
R coil resistance；
The electric capacity of C power supply.
Can be seen that in formula, the inductance of coil is relevant to the number of turn of coil, when coil iron core is magnetized into saturated after,
Magnetization to surrounding air is front more much bigger than saturated, it is believed that after coil electricity, is first magnetized by iron core, after saturated, again
To close on surrounding air magnetization, then as the rising of voltage, its magnetization range far field the most to the periphery is expanded.But voltage raises
The big peak point current brought can cause the resistance to drops of coil, causes coil life short.Therefore need in the design process of fixture
The factors such as the mutual relation of consideration inductance, resistance, voltage etc..
The technique effect of the present invention is confirmed by a series of experiment.
1. use the copper cash of D1mm, outside bag insulant, use ingot iron to do iron core, be wound around two-sided bipolar magnetizing
Coil, the size of the product that magnetizes is the nickel plating finished goods of the sintered NdFeB of D12*1, measures its bipolar magnetic flux after magnetizing,
The results list is as follows:
| Numbering | The coil turn * number of plies | Peak point current (KA) | Bipolar magnetic flux (mwb) |
| 1 | 2*2 | 23.4 | 1.07 |
| 2 | 2*4 | 18.7 | 1.21 |
| 3 | 5*4 | 17.5 | 1.21 |
| 4 | 5*5 | 12.2 | 1.22 |
As shown above, contrast numbered 1 with 2,3 with 4 it can be seen that in the case of the magnetizing coil number of turn is identical, fill
The magnetic coil number of plies is The more the better, so under ensureing the precondition filling saturation magnets, peak point current can be made low, it is ensured that magnetize
The life-span of coil.
2. making iron core with ingot iron, coil is respectively adopted 1mm*X circle and 1.5mm*X circle is wound around the two-sided bipolar line that magnetizes
Circle, the size of the product that magnetizes is the nickel plating finished goods of the sintered NdFeB of D12*1, measures its bipolar magnetic flux, fill after magnetizing
Magnetoelectricity presses solidly and is set to 1900 volts, and the results list is as follows:
| Line footpath (mm) | The number of turn | Peak point current (KA) | Magnetic flux (mwb) |
| 1 | 3 | 11.2 | 8.54 |
| 1 | 4 | 10.1 | 9.84 |
| 1.5 | 3 | 13.5 | 12.1 |
| 1.5 | 4 | 12.1 | 12.1 |
As shown above, in the case of the magnetizing coil copper cash number of turn is identical, the diameter of magnetizing coil is the biggest, sinters neodymium ferrum
The bipolar magnetic flux of boron magnet is the highest.
3., with the copper cash of line footpath D1.5*3 circle, it is wound with ingot iron and makees iron core and do not have ingot iron to make two of iron core
Coil, the size of the product that magnetizes is the nickel plating finished goods of the sintered NdFeB of D12*1, measures its bipolar magnetic flux after magnetizing,
The voltage that magnetizes is fixed as 1900 volts, and result is as follows:
| Line footpath (mm) | Core material | Peak point current (KA) | Magnetic flux (mwb) |
| 1.5 | Ingot iron | 13.5 | 12.1 |
| 1.5 | Iron-core-free | 9.85 | 7.98 |
As shown above, in the case of and the number of turn identical at magnetizing coil copper wire diameter is the most identical, ingot iron is used to do
Iron core is higher than the bipolar magnetic flux of the Sintered NdFeB magnet not having iron core.
Claims (5)
1. the method for Sintered NdFeB magnet multipole magnetization, it is characterised in that:
Making a pair magnetizing clamp arrange Face to face, shuttle plate is arranged between this pair magnetizing clamp, the width of shuttle plate with
The width of each magnetizing clamp pure iron core is identical, and a magnetizing clamp is connected with the positive pole of power supply, another one magnetizing clamp with
The negative pole of power supply connects；Product to be filled is put in the shuttle plate that non-magnet_conductible material is made fixing, then, one group of cartridge is closed
Live, by pulsed field magnetization corona discharge, magnetize to body to be magnetized,
The number of plies and the number of turn of every layer line circle of described magnetizing coil is increased in the case of the line footpath of magnetizing coil copper cash is identical,
To reduce peak point current, every layer of number of turn and described magnetizing coil iron core magnetization saturation voltage adapt；
The line footpath of magnetizing coil copper cash is increased, to improve magnetic flux in the case of the number of turn of magnetizing coil is identical every layer described；
The iron core material of described magnetizing coil is ingot iron, described in the magnetize material of cartridge be pure iron.
The most according to claim 1 for the method for Sintered NdFeB magnet multipole magnetization, it is characterised in that pole of magnetizing described in:
The material of head is electrical pure iron.
Method for Sintered NdFeB magnet multipole magnetization the most according to claim 1, it is characterised in that magnetize described in:
A diameter of Ф 1.0-1.5mm of the copper cash used by coil.
Method for Sintered NdFeB magnet multipole magnetization the most according to claim 1, it is characterised in that magnetize described in:
The electric current that magnetizes of coil is 8-20KA.
Method for Sintered NdFeB magnet multipole magnetization the most according to claim 1, it is characterised in that magnetize described in:
Coil is two-sided bipolar magnetizing coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110032100.9A CN102623133B (en) | 2011-01-28 | A kind of method for Sintered NdFeB magnet multipole magnetization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110032100.9A CN102623133B (en) | 2011-01-28 | A kind of method for Sintered NdFeB magnet multipole magnetization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102623133A CN102623133A (en) | 2012-08-01 |
| CN102623133B true CN102623133B (en) | 2016-12-14 |
Family
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169998A (en) * | 1977-10-03 | 1979-10-02 | Hitachi Metals, Ltd. | Iron core assembly for magnetizing columnar permanent magnets for use in electrostatic developing apparatus |
| US4920326A (en) * | 1989-01-26 | 1990-04-24 | Eastman Kodak Company | Method of magnetizing high energy rare earth alloy magnets |
| US5852393A (en) * | 1997-06-02 | 1998-12-22 | Eastman Kodak Company | Apparatus for polarizing rare-earth permanent magnets |
| CN2399807Y (en) * | 1999-12-14 | 2000-10-04 | 皖南氟塑料泵阀厂 | Multiple polar heads magnetizing clamps |
| EP1612813A2 (en) * | 2001-09-11 | 2006-01-04 | Koyo Seiko Company, Ltd. | Magnetizing device with pole array, and magnetizing method |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4169998A (en) * | 1977-10-03 | 1979-10-02 | Hitachi Metals, Ltd. | Iron core assembly for magnetizing columnar permanent magnets for use in electrostatic developing apparatus |
| US4920326A (en) * | 1989-01-26 | 1990-04-24 | Eastman Kodak Company | Method of magnetizing high energy rare earth alloy magnets |
| US5852393A (en) * | 1997-06-02 | 1998-12-22 | Eastman Kodak Company | Apparatus for polarizing rare-earth permanent magnets |
| CN2399807Y (en) * | 1999-12-14 | 2000-10-04 | 皖南氟塑料泵阀厂 | Multiple polar heads magnetizing clamps |
| EP1612813A2 (en) * | 2001-09-11 | 2006-01-04 | Koyo Seiko Company, Ltd. | Magnetizing device with pole array, and magnetizing method |
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