CN201732654U - Permanent-magnet bias magnetic element - Google Patents
Permanent-magnet bias magnetic element Download PDFInfo
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- CN201732654U CN201732654U CN2010201372121U CN201020137212U CN201732654U CN 201732654 U CN201732654 U CN 201732654U CN 2010201372121 U CN2010201372121 U CN 2010201372121U CN 201020137212 U CN201020137212 U CN 201020137212U CN 201732654 U CN201732654 U CN 201732654U
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- magnet
- permanent magnet
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Abstract
The utility model relates to a permanent-magnet bias magnetic element, which comprises a magnetic core used for forming a magnetic flux loop and provided with at least one air-gap fracture. The magnetic element is characterized in that a working coil is wound on the magnetic core, at least one side of each air-gap fracture of the magnetic core is provided with a pair of permanent magnets, at least one soft magnetic core is arranged on the permanent magnets to connect the two permanent magnets so as to form a permanent magnet bearing magnetic branch which is parallel to each air-gap fracture, and magnetic resistance of the air-gap fracture of the magnetic element is lower than that of the permanent magnet bearing magnetic branch by five times. AC magnetic bias resistant capacity of the magnetic core of the magnetic element is increased effectively, inductance of the magnetic element under certain magnetic bias direct current is strengthened, or section area of the magnetic core is reduced and volume of the magnetic element is reduced, or copper usage length and resistance of the working coil are reduced, and simultaneously, and the shortages that the conventional permanent-magnet bias magnetic elements are easy to be demagnetized by current pulse, and permanent magnets are easy to be in failure in high temperature caused by eddy current loss under high-frequency flux are overcome.
Description
Technical field
The utility model relates to a kind of magnetic element with permanent-magnet bias, is fit to be applied to have bigger direct current (or lower frequency) magnetic flux on the magnetic core of magnetic element, and is superimposed with the situation of the exchange flux of upper frequency.
Background technology
Magnetic element particularly power inductance has application very widely in various power inverters, as the Boost inductance of pfc circuit, the output inductor of DC/DC converter, UPS, the outputting inductance in frequency converter and the inverter etc.But, thereby make inductance value descend along with the raising and the close increase of magnetic bias magnetic of power will bring the saturated of magnetic core.In order to address this problem, further improve the diamagnetic saturability of power inductance, people are applied in permanent magnetic material on the power inductance, offset the magnetic bias that the inductance coil direct current causes with the magnetic bias ability of utilizing permanent magnetic material.Prior art 1 is positioned over permanent magnetic material in the magnetic core air gap.For ferrite permanent-magnet materials, resistivity is than higher, under the high frequency magnetic flux, the eddy current loss that causes is smaller, but the remanent magnetism magnetic of ferrite permanent-magnet materials is close and coercive force is lower, and the working temperature of permission is also lower, at work, cause demagnetization to lose efficacy easily.For the rare earth agglomeration permanent magnetic material, remanent magnetism magnetic is close to be improved greatly with coercive force, and the working temperature of permission is also higher, but resistivity is lower, under the high frequency magnetic flux, can bring very big eddy current, causes the increase of loss and temperature, and permanent magnet was lost efficacy.In order to overcome this problem, prior art 2 with permanent magnet be placed on magnetic air gap near, and be connected to form magnetic loop, and permanent magnet is the binding magnet that adopts rare-earth magnetic powder and binding agent formation by soft magnetic bodies, therefore have higher resistivity, thereby reduce the high-frequency vortex loss.Though but the magnetic bias ability of bonded permanent magnet is more much lower than the magnetic bias ability of rare earth sintered permanent magnet than ferrite permanent-magnet height, is difficult to obtain good effect.And according to the introduction and the embodiment of the prior art, though permanent magnet is positioned near the air gap, exchange flux can pass through this permanent magnet but have greatly, produces eddy current effect, heating and demagnetization inefficacy therein.Therefore, how addressing the above problem is the purpose of this utility model.
Summary of the invention
The purpose of this utility model is a kind of magnetic element with permanent-magnet bias, and this utility model can effectively improve the anti-magnetic bias ability of magnetic core.
The utility model solution is: a kind of magnetic element with permanent-magnet bias, comprise in order to form flux circuit and to have the magnetic core of at least one air gap fracture, it is characterized in that: be arranged with actuating coil on the described magnetic core, at least one side of air gap fracture of described magnetic core is provided with a pair of permanent magnet, described permanent magnet is provided with at least one soft magnetic core, to be communicated with two permanent magnets, thereby form the permanent magnet magnetic branch road that contains in parallel with the air gap fracture, the magnetic resistance of the air gap fracture of described magnetic element is less than the magnetic resistance that contains the permanent magnet magnetic branch road in parallel with it more than 5 times.Technical characterstic of the present utility model is to utilize less but the sintered rare-earth permanent magnetic material with big magnetic bias ability of resistivity improving the D.C. magnetic biasing performance, thus the design simultaneously by magnetic circuit magnetoresistive structures parameter and adopt on the permanent magnetic circuit around short-circuited coil overcome the resistivity of sintering rare-earth material permanent magnet own less bring because the problem that the eddy current loss that the high frequency magnetic flux causes causes too high inefficacy of permanent magnet temperature and permanent magnet to be demagnetized by current impulse easily greatly.
Advantage of the present utility model is: the utility model can improve the anti-magnetic bias ability of magnetic element magnetic core, improves the inductance value under certain DC magnetic bias current, or reduces the magnetic core sectional area, reduces volume or reduces the length and the resistance of actuating coil; Can overcome simultaneously tradition band permanent magnet magnetic element especially the inductance coil element permanent magnet easily by the current impulse demagnetization, the permanent magnet loss is big, temperature is high and the shortcoming that at high temperature lost efficacy easily.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the magnetic circuit schematic diagram of Fig. 1
Fig. 3 is another structural representation of the present utility model
Fig. 4 is the utility model embodiment 1
Fig. 5 is the utility model embodiment 2
Fig. 6 is the utility model embodiment 3
Fig. 7 is the utility model embodiment 4.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is further elaborated.
As depicted in figs. 1 and 2, magnetic element with permanent-magnet bias of the present utility model, comprise in order to form magnetic loop and to have the magnetic core 1 of at least one air gap fracture 2, be arranged with actuating coil 3 on the described magnetic core 1, air gap fracture 2 at least one sides of described magnetic core are provided with a pair of permanent magnet 4, and described permanent magnet 4 is provided with at least one soft magnetic core 5, to be communicated with two permanent magnets 4, form the permanent magnet magnetic branch road, be surrounded with the short-circuited coil 6 of at least one circle on the described permanent magnet branch road.
The magnetic polarity of above-mentioned permanent magnet superposes, and the flux polarity that it produced is opposite with the flux polarity of actuating coil direct-current component generation.
The utility model adopts the rare earth sintered permanent magnet, be positioned near the air gap, simultaneously by magnetic structure and magnetic circuit magnetic resistance parameter designing, the most of magnetic bias magnetic flux process magnetic element main magnetic circuit that makes the permanent magnet generation, to offset the D.C. magnetic biasing that magnetic element coil direct current produces on main magnetic circuit, and the AC magnetism general rule that the magnetic element coil the produces overwhelming majority has only a very little part through the permanent magnet magnetic circuit through air gap.And further by the short-circuited coil that surrounds permanent magnet magnetic circuit cross section is set on the permanent magnet magnetic circuit, the resistivity of this short-circuited coil conductor and the resistivity of permanent magnet differ 10
2More than the order of magnitude, thereby further shield exchange flux through the permanent magnet magnetic loop, with the heating of further reduction permanent magnet with strengthen the ability of its anti-demagnetization by the faradic effect of short-circuited coil.The material that constitutes the permanent magnet magnetic circuit also can comprise soft magnet material except permanent magnet, owing to have only very little a part of exchange flux through the permanent magnet magnetic circuit, therefore can select the higher soft magnetic material of saturation magnetic induction, as silicon steel sheet, and magnetic core etc.For magnetic structure as shown in Figure 2, comprise three magnetic circuit branches, i.e. the main magnetic circuit branch that forms by inductance core 1, air-gap magnetic circuit branch that is made up of air gap 2 and the permanent magnet magnetic circuit branch that is made up of permanent magnet 4 and soft magnetism piece cross structure 5 establish its magnetic resistance and are respectively R
Core, R
GapAnd R
Magnet, in order to achieve the above object, in the magnetic circuit parameters design, the magnetic resistance of each several part magnetic circuit need satisfy formula R
MagnetR
GapR
CoreCondition, these three magnetic resistance difference in size are big more, effect is good more.For magnetic structure as shown in Figure 3, because the symmetrical structure of magnetic circuit and actuating coil, in the magnetic circuit parameters design, as long as satisfy R
MagnetR
Gap, just can reach above-mentioned purpose of design.
Above-mentioned air gap fracture 2 can be made of magnetic cores such as C type, U type, E type, EE type or EI types.
The magnetic element of above-mentioned permanent-magnet bias can be used as input, output inductor, choke or magnetic core and has transformer of D.C. magnetic biasing etc.
Above-mentioned magnetic element also can be made up of magnetic cores such as at least two pairs of EE types or EI types, and is as Fig. 4, shown in Figure 5; Wherein 1 is the air gap fracture, and 2 is the magnetic element magnetic core, and 3 is permanent magnet, and 4 is soft magnetism piece cross structure, and 5 is actuating coil, the same title of same structure and same reference numeral; At least only open a pair of air gap fracture at two pairs of magnetic core center pillars, or only open two pairs of air gap fractures at two pairs of magnetic core side columns; At least two pairs of permanent magnets, polarised direction forms closed hoop, is represented by thin arrow; At least one pair of soft magnetism piece connects brachium pontis; At least one pair of magnet exciting coil is placed on respectively on two couples of EE or the EI magnetic core center pillar, and its direct current flux direction is represented with thick arrow.Described permanent magnet is arranged on described magnetic core center pillar upper and lower surface, and described two pairs of magnetic cores keep at a certain distance away, and connect as brachium pontis with described soft magnetism piece, and described soft magnetic bodies cross structure is arranged on the permanent magnet, to form polar loop in the same way.Described magnetic coil element has a pair of air gap fracture at least on EE type or EI type core post.The polarised direction of described at least two pairs of permanent magnets along same loop direction, is placed at least one pair of soft magnetism piece cross structure at the magnetic post at least on described two pairs of permanent magnets.Not opening air gap side core post can reduce or make actuating coil length reduce than general E type magnetic column section is long-pending, saves copper consumption.Described magnetic element can be used as the two-way output inductor.
This utility model is an example with the inductance coil element, but is not limited only to this.Can be equally applicable to needs to adopt permanent magnetic material to improve the composite magnetic component structure of the anti-magnetic bias ability of magnetic circuit magnetic core, as transformer, and multichannel output integrated inductor and analog thereof.Specific embodiment is as follows:
Fig. 6 is, by magnetic core 1, coil 3, two is with 2, four permanent magnets 4 of high side column air gap fracture, and the short-circuited coil 6 of soft magnetic material 5 and at least one circle is formed.Thin arrow (polarised direction of permanent magnet and magnetic bias direction) and the relative appearance of thick arrow (magnetic direction that the coil direct current produces) can be simultaneously oppositely.Because the effect of permanent magnet magnetic bias makes the dc electric power that actuating coil led to promote significantly.And contained high-frequency ac component on the actuating coil, because the effect of short-circuited coil 6, and its resistivity respectively with permanent magnet, the order of magnitude of soft magnetic material resistivity differs 1E-2 and 1E-5, the eddy current that makes the generation of high-frequency ac component, the overwhelming majority consumes on short-circuited coil.
The design philosophy of Fig. 7 is identical with Fig. 6, because permanent magnet is more, makes that electrical power can limited further lifting.
The above only is of the present utility model than exemplary embodiments, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (6)
1.
A kind of magnetic element with permanent-magnet bias, comprise in order to form flux circuit and to have the magnetic core of at least one air gap fracture, it is characterized in that: be arranged with actuating coil on the described magnetic core, at least one side of air gap fracture of described magnetic core is provided with a pair of permanent magnet, described permanent magnet is provided with at least one soft magnetic core, to be communicated with two permanent magnets, thereby form the permanent magnet magnetic branch road that contains in parallel with the air gap fracture, the magnetic resistance of the air gap fracture of described magnetic element is less than the magnetic resistance that contains the permanent magnet magnetic branch road in parallel with it more than 5 times.
2.
Magnetic element with permanent-magnet bias according to claim 1 is characterized in that: described permanent magnet is to adopt to have strong permanent magnetic characteristic and the lower rare earth permanent-magnetic materials such as sintering ferro-aluminum boron of resistivity.
3.
Magnetic element with permanent-magnet bias according to claim 1 is characterized in that: the described short-circuited coil that is surrounded with at least one circle on the permanent magnet magnetic branch road that contains.
4.
According to claim 1 or 2 or 3 described magnetic elements with permanent-magnet bias, it is characterized in that: the magnetic polarity of described permanent magnet superposes, and the flux polarity that it produced is opposite with the flux polarity of actuating coil direct-current component generation.
5.
Magnetic element with permanent-magnet bias according to claim 1 is characterized in that: described air gap fracture can be made of C type, U type, E type, EE type or EI type magnetic core.
6.
Magnetic element with permanent-magnet bias according to claim 1 is characterized in that: the magnetic element of described permanent-magnet bias can be used as the transformer that there are D.C. magnetic biasing in input, output DC filtering inductance, choke or the magnetic core that need bear big direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201372121U CN201732654U (en) | 2010-03-22 | 2010-03-22 | Permanent-magnet bias magnetic element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201372121U CN201732654U (en) | 2010-03-22 | 2010-03-22 | Permanent-magnet bias magnetic element |
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|---|---|
| CN201732654U true CN201732654U (en) | 2011-02-02 |
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| CN2010201372121U Expired - Fee Related CN201732654U (en) | 2010-03-22 | 2010-03-22 | Permanent-magnet bias magnetic element |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789304A (en) * | 2010-03-22 | 2010-07-28 | 福州大学 | Magnetic element with permanent magnetic bias |
| CN101853729A (en) * | 2010-07-06 | 2010-10-06 | 福州大学 | Magnetic element with permanent magnetic bias |
| CN103578688A (en) * | 2012-07-20 | 2014-02-12 | 南昌航空大学 | Inductance element provided with permanent magnet bias magnet and bypass magnetic core |
| CN105719825A (en) * | 2016-01-22 | 2016-06-29 | 深圳顺络电子股份有限公司 | Inductor and fabrication method thereof |
| GB2607636A (en) * | 2021-06-10 | 2022-12-14 | Eaton Intelligent Power Ltd | Improved passive device, arrangement and electric circuit for limiting or reducing a current rise |
-
2010
- 2010-03-22 CN CN2010201372121U patent/CN201732654U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101789304A (en) * | 2010-03-22 | 2010-07-28 | 福州大学 | Magnetic element with permanent magnetic bias |
| CN101853729A (en) * | 2010-07-06 | 2010-10-06 | 福州大学 | Magnetic element with permanent magnetic bias |
| CN103578688A (en) * | 2012-07-20 | 2014-02-12 | 南昌航空大学 | Inductance element provided with permanent magnet bias magnet and bypass magnetic core |
| CN105719825A (en) * | 2016-01-22 | 2016-06-29 | 深圳顺络电子股份有限公司 | Inductor and fabrication method thereof |
| GB2607636A (en) * | 2021-06-10 | 2022-12-14 | Eaton Intelligent Power Ltd | Improved passive device, arrangement and electric circuit for limiting or reducing a current rise |
| WO2022258225A1 (en) * | 2021-06-10 | 2022-12-15 | Eaton Intelligent Power Limited | Improved passive device, arrangement and electric circuit for limiting or reducing a current rise |
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| 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: 20110202 Termination date: 20150322 |
|
| EXPY | Termination of patent right or utility model |