CN104848931A - Double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with eddy current compensation - Google Patents
Double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with eddy current compensation Download PDFInfo
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- CN104848931A CN104848931A CN201510235707.5A CN201510235707A CN104848931A CN 104848931 A CN104848931 A CN 104848931A CN 201510235707 A CN201510235707 A CN 201510235707A CN 104848931 A CN104848931 A CN 104848931A
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Abstract
The invention provides a double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure with eddy current compensation, belonging to the field of vibration measurement technology. A cylindrical closed type magnetic field structure design is provided. Two cylindrical permanent magnets are symmetrically installed at two ends of a center magnet yoke and face magnetic poles. Two symmetric closed magnetic circuits are formed by magnet yokes. The magnetic induction intensity distribution with high uniformity is generated in air gaps. After a working coil is energized, the working coil is affected by Lorentz force in a magnetic field, and precisely controllable electromagnetic drive force is generated. The surfaces of the magnet yokes adjacent to the air gaps are provided with an array type micro structure in the form of deep trenches, and the eddy current loss can be effectively inhibited. According to the double-magnetic-circuit two-end symmetric excitation cylindrical closed magnetic field type electromagnetic vibration table magnetic circuit structure, large stroke, high magnetic field uniformity, high thrust and a linear electromagnetic driving force characteristic can be considered, and a high precision and large stroke electromagnetic vibration table magnetic circuit structure technical scheme is provided for low-frequency/ultra-low frequency vibration calibration.
Description
Technical field
The invention belongs to vibration calibrating device field, relate generally to a kind of double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation.
Background technology
The electromagnetic vibration generator system producing standard vibration signal is the key equipment carrying out high precision vibration calibration, is also the important component part of national vibration measurement technical system.Magnetic structure is the core key part in electromagnetic vibration generator system, generally be made up of permanent magnet, yoke, coil rack and working coil etc., permanent magnet and yoke form magnetic circuit, the Distribution of Magnetic Field of high evenness is produced in air gap, in magnetic field, be subject to Lorentz force effect after working coil energising, thus produce accurate controlled electromagnetic actuation force.In recent years, Aero-Space, build a bridge, the field such as protection against and mitigation of earthquake disasters all proposes low frequency/demand of superlow frequency vibrating calibration.For improving the signal to noise ratio (S/N ratio) of standard vibration signal, ensureing the calibration accuracy of low frequency/superlow frequency vibrating, requiring that electromagnetic vibration generator system is under the prerequisite ensureing thrust and precision, has stroke large as far as possible.In the design process of large-stroke electromagnetic vibration magnetic structure, there is amplitude, magnetic field homogeneity, electromagnetic actuation force size, linear electromagnetic driving force specislity, contradiction between processing and assembly precision, key wherein and difficult point how to be designed by rational magnetic structure, and by ensureing processing and assembly precision, the strong Magnetic Induction Density Distribution of high evenness is realized in long air gap, and after coil electricity, obtain desirable linear electromagnetic driving force specislity, namely the electromagnetic actuation force size exported in total travel is directly proportional to the electric current in working coil, and have nothing to do with the position residing for working coil.
The He Wen of Zhejiang University etc. propose a kind of large-stroke electromagnetic vibration magnetic structure technical scheme (1. Zhejiang University, " two magnetic route structure of large-stroke electromagnetic vibration ", China Patent No.: ZL200710069095.2; 2. Zhejiang University, " a kind of electromagnetic vibration generator system ", China Patent No.: ZL200820087256.0; 3. Zhejiang University, " there is the shaking table based on linear grating chi feed back control system ", China Patent No.: ZL201110115072.7; 4.Wen He, et al. " Closed-Double-Magnetic Circuit for aLong-stroke Horizontal Electromagnetic Vibration Exciter ", IEEE Transactions on Magnetics, 2011,49 (8): 4865-4872).In this technical scheme, magnet (cylindrical), central magnetic pole (yoke) and tubular outer magnetic pole coaxial cable assemble, the same magnetic pole of two magnets is positioned opposite, be arranged on central magnetic pole two ends, magnet center is provided with through hole, non-magnetic bolt is adopted to be fixed, it is inner that central magnetic pole is coaxially assemblied in tubular outer magnetic pole, and tubular mounting coil is arranged in air gap in central magnetic pole.This technical scheme adopts two magnet complementary, leakage field is less, magnet utilization factor is high, can realize larger thrust, larger stroke and lower waveform distortion index, be one of electromagnetic vibration generator system magnetic structure technical scheme with independent intellectual property right and higher degree of being practical of domestic open report.
The Hans-J.von Martens etc. of German federal physical technique research institute (PTB) it is also proposed a kind of large-stroke electromagnetic vibration magnetic structure technical scheme (1.Hans-J.von Martens, et al, " Traceability of Vibration and ShockMeasurements by Laser Interferometry ", Measurement, 2000,28:3-20).This technical scheme adopts cylindrical soft magnetic core, cylindrical permanent-magnet body and cylindrical shape soft magnetic tube, the two ends that the same magnetic pole of two permanent magnets is positioned opposite, be arranged on cylindrical shape soft magnetic tube, soft magnetic core is coaxially assemblied in the inside of soft magnetic tube, closed magnetic circuit is formed by the soft magnetic part at two ends, coil rack and working coil are cylindrical shape, and coil rack is sleeved in central magnetic yoke slidably.Adopt the amplitude of the large-stroke electromagnetic vibration of this technical scheme to reach 1m, coordinate high-performance permanent magnet and yoke material, the key technical indexes such as transverse vibration ratio, waveform distortion of higher level can be realized.
The weak point that above-mentioned two kinds of technical schemes exist is: 1) cylindrical shape outer yoke need carry out long inside dimension processing, processing difficulties, and precision is difficult to ensure; 2) when adopting cylindrical permanent magnet, permanent magnet need processing through hole and be bolted in yoke by non-magnetic, assemble complicated and can have an impact to magnetic circuit; When adopting cylindrical permanent-magnet body, the sintering of large scale cylindrical permanent-magnet body, process, magnetize and assemble all comparatively difficulty; 3) cylindrical shape outer yoke need be sleeved in central magnetic yoke, as permanent magnet adopts the mode of assembling afterwards that first magnetizes, assembles very difficult, and assembly precision is difficult to ensure; The permanent magnet of AlNiCo material can adopt the mode of first assembling and magnetizing afterwards, but due to the permanent magnet coercive force of AlNiCo material lower, the effect that magnetizes is restricted, poor performance, the mechanical property of serious restriction magnetic structure and index.
The Kenneth Joseph Metzgar etc. of APS company of the U.S. proposes a kind of large-stroke electromagnetic vibration magnetic structure technical scheme (Kenneth Joseph Metzgar et al, " Electrodynamic Force Generator ", U.S. Patent number: US3816777).The magnetic structure of this technical scheme is made up of 4 groups of identical sub-assemblies, each sub-assemblies is made up of two wedge-shaped poles sheets, linking block (soft magnetic material), a magnet, be connected block separate and connect the thick end of two wedge-shaped poles sheets, form the pincer structure that has long air gap, magnet to be arranged in air gap and to be fixed on a wedge-shaped poles sheet, and magnet can adopt the mode of first assembling and magnetizing afterwards.After 4 groups of sub-assemblies are stacked between two, adopt bolt to be fixed by two stacked sub-assemblies and form stacked pincer structure, again by the docking of the vice jaw part of two stacked pincer structure, and adopt the bolt crouched in wedge-shaped poles sheet to be connected by docking structure fastening, form complete magnetic structure.Magnetic structure after docking has two long air gaps, and moving-coil (working coil) is arranged in air gap.This technical scheme easily realizes high magnetic flux density in air gap, and has carried out more ripe commercialization and popularization.
This technical scheme exist weak point be: 1) whole magnetic structure by multiple textural association, be spliced to form, complex structure; Fritter permanent magnet need adopt gluing or alternate manner to be arranged on wedge-shaped poles sheet, and assembling is complicated, is difficult to ensure assembly precision; 2) in air gap, the static-magnetic induction of a certain position is directly related with the working point of this place's permanent magnet, and the homogeneity of whole air gap internal magnetic field is difficult to ensure, higher to the coherence request of the materials and process of fritter permanent magnet; 3) permanent magnet is directly in the face of air gap, and the complementary field produced after working coil energising can magnetize or degaussing to its pressure, when passing to larger current in working coil, easily makes permanent magnet produce irreversible demagnetization; 4) during working coil energising, the magnetic flux of coil side increases, opposite side magnetic flux reduces, because permanent magnet is directly in the face of air gap, the magnetic circuit that magnetic flux increases side is easily saturated, the magnetic flux that the magnetic flux that now coil side increases reduces than opposite side is few, cause the average magnetic induction intensity of coil position to reduce, and then make the standard vibration signal of generation produce distortion.
As previously mentioned, in the design process of large-stroke electromagnetic vibration magnetic structure, there is amplitude, magnetic field homogeneity, electromagnetic actuation force size, linear electromagnetic driving force specislity, contradiction between processing and assembly precision, difficult point and the key of design are designed by rational magnetic structure, the strong Magnetic Induction Density Distribution of high evenness is realized in long air gap, and the electromagnetic actuation force exported in total travel after making working coil be energized is directly proportional to size of current, and have nothing to do with working coil present position, namely obtain desirable linear electromagnetic driving force specislity.And prior art all exists various problems and shortcomings part, the linearity index exporting electromagnetic actuation force in air gap after the homogeneity of static Magnetic Induction Density Distribution and coil electricity has been difficult to further lifting.
Key issue wherein has 3 points: in (1) long air gap, the homogeneity of main magnetic circuit Magnetic Induction Density Distribution is difficult to ensure.Before coil electricity, permanent magnet excitation forms the Magnetic Induction Density Distribution of main magnetic circuit, and along with the increase of electromagnetic vibration generator system stroke, the non-uniformity of long air gap internal magnetic field becomes very outstanding, exports the linearity of electromagnetic actuation force after serious restriction coil electricity; Have researchist to attempt being compensated by adjustment current waveform, but effect is difficult to ensure, especially poor to order magnetic field heterogenicity error compensation effect, the effectively real and compensation method had compared with high practicability is not yet proposed at present both at home and abroad.(2) impact of armature reaction is produced after working coil energising.Produce complementary field after working coil energising, superpose be coupled with main field, produce main field and increase magnetic or demagnetizing effect, make diverse location in air gap, the especially Magnetic Induction Density Distribution of working coil position become uneven, this phenomenon is called armature reaction.Affect by armature reaction, in stroke, diverse location place is when the current density that coil loads is identical, and the electromagnetic actuation force of output is inconsistent; And be not directly proportional to current density in the size of the same position place electromagnetic actuation force of air gap, exist certain non-linear.Armature reaction is that electromagnetic vibration generator system produces one of key factor of waveform distortion, and its impact increases with the increase of drive current, is the difficult problem in the design of electromagnetic vibration generator system magnetic structure.(3) long yoke and large scale permanent magnet are processed and are difficult to ensure with assembling difficulty, precision.In the magnetic structure of large-stroke electromagnetic vibration, long central magnetic yoke need adopt reasonable manner to fix with two ends supporting way, for ensureing continuity and the integrality of magnetic structure, the key position that magnetic flux is intensive should avoid the mounting structures such as processing through hole/threaded hole as far as possible; The sintering of large scale permanent magnet, processing and assemble all very difficult, yield rate is low, and permanent magnet is hard brittle material and expensive, and assembly method and unreasonable structure are easily damaged, and generally should not process the mounting structure of the forms such as through hole on permanent magnet; Will obtain larger electromagnetic actuation force, the general strong magnetic permanent magnet adopting the materials such as NdFeB, needing to overcome huge magnetic attraction in strong magnetic permanent magnet Assembly of the parts process, is a difficult problem of this technical field simultaneously.
In addition, in the course of work of large-stroke electromagnetic vibration, what pass in working coil is alternation drive current, and current amplitude is maximum reaches tens amperes, coil in long air gap in the axial direction with sinusoidal rule to-and-fro movement.According to Theory of Electromagnetic Field, the alternating magnetic field that exchange current and coil movement produce can in yoke surfaces, and especially adjacent with air gap yoke surfaces can produce current vortex, causes eddy current loss.Eddy current loss can produce the thermal losses that power reaches as high as a few hectowatt on the one hand, and thermal value is surprising, and then brings a series of thermal perturbation and thermal deformation problem; The transient field problem that another aspect alternating magnetic field and current vortex cause, can make actual performance index produce relatively large deviation with the result obtained by traditional design theory and analytical approach, have a strong impact on design accuracy and effect.Eddy current loss is a difficult problem in the design of electromagnetic vibration generator system magnetic structure, not yet finds effective solution both at home and abroad at present.
To sum up, restrict by the problems referred to above, the standard low frequency vibration adopting prior art to produce is difficult to there is breakthrough again in the indexs such as waveform distortion, is difficult to the high-precision calibration meeting low frequency/superlow frequency vibrating, the demand with the vibration calibration of very low frequency (VLF) and ultraprecise feature especially of future generation.Therefore, how to pass through the innovation of the links such as method, structure, material and optimal design, propose the electromagnetic vibration generator system magnetic structure technical scheme with super large stroke, ultralow frequency of operation and superhigh precision, the development for vibration measurement technology is significant.One or several in the problems referred to above achieves a solution, and the performance of large-stroke electromagnetic vibration all can be made to be significantly improved, and makes low frequency/superlow frequency vibrating collimation technique obtain substantive breakthroughs.
Summary of the invention
The object of the invention is the problems referred to above existed for prior art, a kind of double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure technical scheme of eddy current compensation is provided, it is simple that the present invention has structure, precision is high, Long Distances can be taken into account, highfield homogeneity, high thrust and linear electromagnetic driving force specislity, effectively can solve prior art Problems existing with not enough, especially there is the characteristic of outstanding suppression eddy current loss, thus provide a kind of high precision for the calibration of low frequency/superlow frequency vibrating, the electromagnetic vibration generator system magnetic structure of Long Distances.
Technical solution of the present invention is:
A double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure for eddy current compensation, by permanent magnet, central magnetic yoke, long tubular yoke, short cylinder shaped yoke, end yoke, coil rack and working coil are formed, overall one-tenth axially symmetric structure, permanent magnet, central magnetic yoke, end yoke is cylindrical, long tubular yoke, short cylinder shaped yoke, coil rack is cylindrical shape, permanent magnet, central magnetic yoke, long tubular yoke, short cylinder shaped yoke, end yoke, point-blank, two permanent magnet symmetries are arranged between the two ends of central magnetic yoke and two end yokes the axis of coil rack, and positioned opposite with magnetic pole, two end faces of each permanent magnet respectively with central magnetic yoke, the corresponding end face close contact of end yoke, the internal diameter of two short cylinder shaped yokes is equal with the external diameter of long tubular yoke, and one end of two short cylinder shaped yokes holds yoke to be rigidly connected with two respectively, other end symmetry is sleeved on the two ends of long tubular yoke and is rigidly connected with long tubular yoke, and long tubular yoke coaxial package is in central magnetic yoke, and separated by air gap between central magnetic yoke, coil rack is sleeved on slidably in central magnetic yoke and is arranged in air gap, coil rack is wound with working coil, accurate controlled drive current is passed in working coil, the sidewall of long tubular yoke is provided with along its length and cuts open seam, the two ends of coil rack are provided with wing plate, wing plate stretches out from cuing open seam, the external cylindrical surface of central magnetic yoke and the inner cylinder face of long tubular yoke are provided with the array microstructure of deep trench form, and deep trench is along the length direction periodic arrangement of air gap.
The mounting means of described permanent magnet is the permanent magnet installation sleeve of employing two cylindrical shapes, non-magnet_conductible material, by coaxial for permanent magnet adhesive asserably in the inside of permanent magnet installation sleeve, is fixed by permanent magnet by fixed permanent magnet installation sleeve; The mounting means of described central magnetic yoke is the yoke installation sleeve of employing two cylindrical shapes, non-magnet_conductible material, two yoke installation sleeves are sleeved on the two ends of central magnetic yoke and are rigidly connected with central magnetic yoke, by fixing yoke installation sleeve, the mode that central magnetic yoke supports with two ends is fixed.
The described number cuing open seam is 2, and diameter distribution on the sidewall of long tubular yoke.
Described permanent magnet is the multiple fritter permanent magnet of employing, is spliced to form in bonding mode.
The material of described permanent magnet is NdFeB.
The material of described central magnetic yoke, long tubular yoke, short cylinder shaped yoke and end yoke is high magnetic permeability electrical pure iron.
The material of described coil rack is pottery, grouan, fiberglass or rigid plastic.
The width of described air gap is 10mm ~ 40mm.
The material of described permanent magnet installation sleeve and yoke installation sleeve is pottery, grouan, fiberglass or rigid plastic.
The good result of technological innovation of the present invention and generation is:
(1) magnetic structure of the present invention is simple, parts machining and assembly difficulty low, easily ensure high processing and assembly precision; First magnetize because permanent magnet can adopt, the mode of rear assembling, therefore can adopt the high-performance permanent magnet of the materials such as NdFeB, thus obtain high gap density and large electromagnetic actuation force; Solve part in prior art and be difficult to processing, permanent magnet assembling difficulty, part processing and assembly precision are difficult to the problems such as guarantee,
main magnetic circuit Magnetic Induction Density Distribution in higher long air gap can be realized uniformity index.This is one of the present invention's innovative point being different from prior art.
(2) the present invention is set up at the concrete cloth of magnetic circuit, and/demagnetizing effect is filled in permanent magnet produces complementary field pressure after directly not bearing working coil energising in the face of air gap; During working coil energising, the magnetic flux of coil side increases, opposite side magnetic flux reduces, magnetic flux increases and the effect of reduction is cancelled out each other, and the average magnetic induction intensity of coil position is remained unchanged substantially, thus can realize the linear electromagnetic driving force specislity of approximate ideal; Solve permanent magnet in prior art and, directly in the face of air gap, when working coil passes to big current, easily produce irreversible demagnetization, export the problems such as the poor linearity of electromagnetic actuation force;
realize higher output electricity the linearity index of Magnetic driving power.This is the innovative point two that the present invention is different from prior art.
(3) the present invention adopts yoke installation sleeve reliably to install fixing to the mode that long central magnetic yoke supports with two ends, and it is fixing to adopt permanent magnet installation sleeve to carry out installation to permanent magnet, by permanent magnet adhesive asserably behind permanent magnet installation sleeve inside, can integrally load designated mounting position, significantly reduce the assembly difficulty of permanent magnet;
solve long sized central yoke and hard brittle material permanent magnetism a difficult problem for fixing and strong magnetic permanent magnet Assembly of the parts reliably installed by body part.This is the innovative point three that the present invention is different from prior art.
(4) the present invention is on the external cylindrical surface of the central magnetic yoke adjacent with air gap and the inner cylinder face of long tubular yoke, along the array microstructure of gas length direction periodic arrangement deep trench form, theory all shows with simulation analysis and experimental result, the method can suppress the generation of current vortex, greatly reduce the impact of eddy current loss, both thermal perturbation that eddy current loss brings, thermal deformation problem had been efficiently solved, the actual performance index of magnetic structure and Theoretical Design result can be made again to have higher consistance, realize higher design accuracy;
solve a difficult problem for this electromagnetic vibration generator system magnetic structure of eddy current loss design.This is the innovative point four that the present invention is different from prior art.
(5) in addition, in the present invention, permanent magnet can adopt monolithic large scale permanent magnet, multiple fritter permanent magnet also can be adopted to obtain first to splice the mode magnetized afterwards, greatly can reduce the sintering of large scale permanent magnet, process and the difficulty magnetized;
solve large scale permanent magnet sintering, difficult problem of processing and magnetize.this is the innovative point five that the present invention is different from prior art.
Accompanying drawing explanation
Fig. 1 is the overall schematic of the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation;
Fig. 2 is the diagrammatic cross-section of the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation;
Fig. 3 is the schematic diagram of permanent magnet pole arrangement and main magnetic circuit;
The schematic diagram of the deep trench embodiment centered by Fig. 4 on yoke external cylindrical surface and long tubular yoke inner cylinder face;
The schematic diagram of another embodiment of deep trench centered by Fig. 5 on yoke external cylindrical surface and long tubular yoke inner cylinder face;
The array microstructure schematic diagram of deep trench form on yoke external cylindrical surface centered by Fig. 6;
Fig. 7 adopts permanent magnet installation sleeve, yoke installation sleeve to install fixing schematic diagram to permanent magnet and central magnetic yoke;
Fig. 8 is the structural representation of permanent magnet installation sleeve;
Fig. 9 is the structural representation of yoke installation sleeve;
Figure 10 is the structural representation of a coil rack embodiment;
Figure 11 is the structural representation of another embodiment of coil rack.
In figure, piece number illustrates: 1 permanent magnet, 2 central magnetic yoke, 3 long tubular yokes, 4 short cylinder shaped yokes, 5 end yokes, 6 coil racks, 7 air gaps, 8 working coils, 9 permanent magnet installation sleeves, 10 yoke installation sleeves, 11 first magnetic circuits, 12 second magnetic circuits, 13 deep trench, 14 wing plates, 15 cut open seam.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, and provides embodiment.
A double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure for eddy current compensation, by permanent magnet 1, central magnetic yoke 2, long tubular yoke 3, short cylinder shaped yoke 4, end yoke 5, coil rack 6 and working coil 8 are formed, overall one-tenth axially symmetric structure, permanent magnet 1, central magnetic yoke 2, end yoke 5 is cylindrical, long tubular yoke 3, short cylinder shaped yoke 4, coil rack 6 is cylindrical shape, permanent magnet 1, central magnetic yoke 2, long tubular yoke 3, short cylinder shaped yoke 4, end yoke 5, point-blank, two permanent magnet 1 symmetries are arranged between the two ends of central magnetic yoke 2 and two end yokes 5 axis of coil rack 6, and positioned opposite with magnetic pole, two end faces of each permanent magnet 1 respectively with central magnetic yoke 2, the corresponding end face close contact of end yoke 5, the internal diameter of two short cylinder shaped yokes 4 is equal with the external diameter of long tubular yoke 3, and one end of two short cylinder shaped yokes 4 holds yoke 5 to be rigidly connected with two respectively, other end symmetry is sleeved on the two ends of long tubular yoke 3 and is rigidly connected with long tubular yoke 3, and long tubular yoke 3 coaxial package is in central magnetic yoke 2, and separated by air gap 7 between central magnetic yoke 2, coil rack 6 is sleeved on slidably in central magnetic yoke 2 and is arranged in air gap 7, coil rack 6 is wound with working coil 8, accurate controlled drive current is passed in working coil 8, the sidewall of long tubular yoke 3 is provided with along its length and cuts open seam 15, the two ends of coil rack 6 are provided with wing plate 14, wing plate 14 stretches out from cuing open seam 15, the external cylindrical surface of central magnetic yoke 2 and the inner cylinder face of long tubular yoke 3 are provided with the array microstructure of deep trench 13 form, and deep trench 13 is along the length direction periodic arrangement of air gap 7.
The mounting means of described permanent magnet 1 is the permanent magnet installation sleeve 9 of employing two cylindrical shapes, non-magnet_conductible material, by coaxial for permanent magnet 1 adhesive asserably in the inside of permanent magnet installation sleeve 9, is fixed by permanent magnet 1 by fixed permanent magnet installation sleeve 9; The mounting means of described central magnetic yoke 2 is yoke installation sleeves 10 of employing two cylindrical shapes, non-magnet_conductible material, two yoke installation sleeves 10 be sleeved on the two ends of central magnetic yoke 2 and be rigidly connected with central magnetic yoke 2, by fixing yoke installation sleeve 10, the mode that central magnetic yoke 2 supports with two ends being fixed.
The described number cuing open seam 15 is 2, and diameter distribution on the sidewall of long tubular yoke 3.
Described permanent magnet 1 is the multiple fritter permanent magnet of employing, is spliced to form in bonding mode.
The material of described permanent magnet 1 is NdFeB.
The material of described central magnetic yoke 2, long tubular yoke 3, short cylinder shaped yoke 4 and end yoke 5 is high magnetic permeability electrical pure iron.
The material of described coil rack 6 is pottery, grouan, fiberglass or rigid plastic.
The width of described air gap 7 is 10mm ~ 40mm.
The material of described permanent magnet installation sleeve 9 and yoke installation sleeve 10 is pottery, grouan, fiberglass or rigid plastic.
One embodiment of the present of invention are provided below in conjunction with Fig. 1 ~ Fig. 3.In the present embodiment, the double magnetic circuit two ends of eddy current compensation symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure vibrates for generation of the standard low frequency of horizontal direction.Permanent magnet 1 is the strong magnetic permanent magnet of NdFeB material, and the residual magnetization of the NdFeB material adopted is 1.17T, and coercive force is 890kA/m, and the N of two permanent magnets 1 is extremely positioned opposite, and symmetry is arranged between the two ends of central magnetic yoke 2 and two end yokes 5.Central magnetic yoke 2, long tubular yoke 3, two short cylinder shaped yokes 4, two end yoke 5 all adopts high magnetic permeability electrical pure iron material DT4C to make, and maximum relative permeability can reach 12000, and saturation flux amount is 2.5T.Central magnetic yoke 2, two permanent magnets 1, two end yoke 5 is cylindrical, long tubular yoke 3, two short cylinder shaped yokes 4 and coil rack 6 are cylindrical shape, and two permanent magnets 1, central magnetic yoke 2, long tubular yoke 3, two short cylinder shaped yokes 4, two end yoke 5, coil racks 6 coaxially assemble.Separated by air gap 7 between central magnetic yoke 2 and long tubular yoke 3, air gap 7 thickness is 15mm, wherein forms the Magnetic Induction Density Distribution of high evenness.Long tubular yoke 3 and two short cylinder shaped yokes 4 adopt screw to be rigidly connected respectively, also can adopt other connected mode in implementation process, or adopt one piece of complete material that long tubular yoke 3 is become a part with two short cylinder shaped yoke 4 overall processing.One end of two short cylinder shaped yokes 4 and two hold yoke 5 to adopt screw to be rigidly connected respectively.In the present embodiment, long tubular yoke 3 sidewall is provided with along its length and cuts open seam 15, number is 2, and 2 are cutd open the distribution of seam 15 diameter.
In the present embodiment, permanent magnet excitation formed the magnetic line of force of main magnetic circuit process path as shown in Figure 3.For the first magnetic circuit 11, the magnetic line of force is from the N pole of permanent magnet 1, and successively through central magnetic yoke 2, long tubular yoke 3, short cylinder shaped yoke 4 and end yoke 5, the S pole then getting back to permanent magnet 1 forms closed magnetic circuit.First magnetic circuit 11 and the symmetrical form of the second magnetic circuit 12.
Coil rack 6 adopts 99 aluminium oxide ceramics to make, and entirety is cylindrical shape, is sleeved on slidably in central magnetic yoke 2.Working coil 8 adopts insulated copper enameled wire to be wound at coil rack 6 outside surface, and its entirety also becomes cylindrical shape, and thickness is 5mm, and logical maximum current density is 5A/mm
2.After electromagnetic vibration generator system magnetic structure has assembled, coil rack 6 and working coil 8 are arranged in air gap 7.During electromagnetic vibration generator system work, control signal is after power amplifier amplifies, the power current that output effective value is up to tens A is loaded in working coil 8, according to Theory of Electromagnetic Field, the working coil 8 be energized in magnetic field is subject to the effect of horizontal direction Lorentz force, thus exports accurate controlled electromagnetic actuation force.By control alive size and Orientation can the size and Orientation of precise hard_drawn tuhes electromagnetic actuation force.If control signal adopts standard sine electric signal, working coil 8 and coil rack 6 will produce standard low frequency sinusoidal vibration vertically under electromagnetic actuation force effect.
An embodiment of deep trench on central magnetic yoke external cylindrical surface and long tubular yoke inner cylinder face is provided below in conjunction with Fig. 4 and Fig. 6.Fig. 4 is the partial enlarged drawing of Fig. 3.Deep trench 13 is distributed on the external cylindrical surface of the central magnetic yoke 2 adjacent with air gap and the inner cylinder face of long tubular yoke 3, in figure deep trench 13 centrally yoke 2 and long tubular yoke 3 circumferencial direction processing, along the length direction periodic arrangement of air gap 7.In the present embodiment, deep trench 13 is rectangle groove, and its width is 1mm, and the degree of depth going deep into central magnetic yoke 2 and long tubular yoke 3 surface is 10mm, and the distance between two adjacent deep trench 13 is 10mm.Theory shows with simulation analysis and experimental result, and in the present invention, the array microstructure of deep trench form effectively can suppress the generation of current vortex, significantly reduces eddy current loss.
Another embodiment of deep trench on central magnetic yoke external cylindrical surface and long tubular yoke inner cylinder face is provided below in conjunction with Fig. 5.Fig. 5 is also the partial enlarged drawing of Fig. 3.In the present embodiment, deep trench 13 is profile of tooth groove, and its tooth root width is 1mm, and the degree of depth that crown gos deep into central magnetic yoke 2 and long tubular yoke 3 surface is 10mm, and the distance between two adjacent deep trench 13 is 10mm.
An embodiment of permanent magnet installation sleeve is provided below in conjunction with Fig. 7, Fig. 8.In the present embodiment, permanent magnet installation sleeve 9 adopts stupalith to make, entirety is cylindrical shape, its thickness is vertically equal with permanent magnet 1, it is inner that permanent magnet 1 is assemblied in permanent magnet installation sleeve 9 with bonding way, then permanent magnet installation sleeve 9 is threaded connection and is fixed in end yoke 5 or short cylinder shaped yoke 4, realize fixing the installation of permanent magnet 1.First complete the assembling of other part in assembling process, then under the cooperation of assembly tooling, the assembly that permanent magnet 1, permanent magnet installation sleeve 9 and the part that is attached thereto are formed with magnetic pole relatively, overall equipped, finally installations is carried out to permanent magnet installation sleeve 9 fixing.Mounting means of the present invention is adopted to reduce the assembly difficulty of permanent magnet.
An embodiment of yoke installation sleeve is provided below in conjunction with Fig. 9.Coil rack 6 and working coil 8 are sleeved in central magnetic yoke 2 and have longer stroke, it is fixing that the mode that long sized central yoke 2 must support with two ends carry out installations.In the present embodiment, yoke installation sleeve 10 adopts stupalith to make, entirety is cylindrical shape, two yoke installation sleeves 10 are sleeved on the two ends of central magnetic yoke 2 and are rigidly connected by screw and central magnetic yoke 2, two yoke installation sleeves 10 there is threaded hole, is rigidly fixed in long tubular yoke 3 by screw.
Figure 10 gives an embodiment of coil rack.In the present embodiment, coil rack 6 adopts 99 alumina ceramic materials, and entirety is cylindrical shape, and wall thickness is 5mm, and coil rack 6 is sleeved in central magnetic yoke 2 slidably.Working coil 8 is evenly close, and around on coil rack 6, the two ends of coil rack 6 are processed with small boss, come off for preventing working coil 8.In the present embodiment, coil rack 6 two ends diameter distributes 4 wing plates 14, wing plate 14 cuts open in seam 15 from two long tubular yoke 3 sidewall and stretches out, and coil rack 6 is connected with the moving component (the air supporting cover as air-float guide rail) of electromagnetic vibration generator system by wing plate 14.
Figure 11 gives another embodiment of coil rack.In the present embodiment, the thin-walled of coil rack 6 is provided with lightening hole, and for alleviating the weight of coil rack 6, lightening hole is the small sircle hole that gathers, and is uniformly distributed along thin-walled surrounding.Also the lightening hole of other form such as oblong aperture, small square hole can be adopted in actual implementation process.
Claims (9)
1. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of an eddy current compensation, by permanent magnet (1), central magnetic yoke (2), long tubular yoke (3), short cylinder shaped yoke (4), end yoke (5), coil rack (6) and working coil (8) are formed, overall one-tenth axially symmetric structure, it is characterized in that: permanent magnet (1), central magnetic yoke (2), end yoke (5) is cylindrical, long tubular yoke (3), short cylinder shaped yoke (4), coil rack (6) is cylindrical shape, permanent magnet (1), central magnetic yoke (2), long tubular yoke (3), short cylinder shaped yoke (4), end yoke (5), the axis of coil rack (6) point-blank, two permanent magnet (1) symmetries are arranged between the two ends of central magnetic yoke (2) and two ends yoke (5), and it is positioned opposite with magnetic pole, two end faces of each permanent magnet (1) respectively with central magnetic yoke (2), the corresponding end face close contact of end yoke (5), the internal diameter of two short cylinder shaped yokes (4) is equal with the external diameter of long tubular yoke (3), one end of two short cylinder shaped yokes (4) holds yoke (5) to be rigidly connected respectively with two, other end symmetry is sleeved on the two ends of long tubular yoke (3) and is rigidly connected with long tubular yoke (3), long tubular yoke (3) coaxial package is in central magnetic yoke (2), and separated by air gap (7) between central magnetic yoke (2), coil rack (6) is sleeved on central magnetic yoke (2) slidably and is above arranged in air gap (7), coil rack (6) is wound with working coil (8), accurate controlled drive current is passed in working coil (8), the sidewall of long tubular yoke (3) is provided with along its length and cuts open seam (15), the two ends of coil rack (6) are provided with wing plate (14), wing plate (14) stretches out from cuing open seam (15), the external cylindrical surface of central magnetic yoke (2) and the inner cylinder face of long tubular yoke (3) are provided with the array microstructure of deep trench (13) form, deep trench (13) is along the length direction periodic arrangement of air gap (7).
2. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1, it is characterized in that: the mounting means of described permanent magnet (1) is the permanent magnet installation sleeve (9) of employing two cylindrical shapes, non-magnet_conductible material, by coaxial for permanent magnet (1) adhesive asserably in the inside of permanent magnet installation sleeve (9), by fixed permanent magnet installation sleeve (9), permanent magnet (1) is fixed; The mounting means of described central magnetic yoke (2) is the yoke installation sleeve (10) of employing two cylindrical shapes, non-magnet_conductible material, two yoke installation sleeves (10) be sleeved on the two ends of central magnetic yoke (2) and be rigidly connected with central magnetic yoke (2), by fixing yoke installation sleeve (10), the mode that central magnetic yoke (2) supports with two ends being fixed.
3. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, it is characterized in that: described in cut open seam (15) number be 2, and diameter distribution on the sidewall of long tubular yoke (3).
4. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, is characterized in that: described permanent magnet (1) is the multiple fritter permanent magnet of employing, is spliced to form in bonding mode.
5. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, is characterized in that: the material of described permanent magnet (1) is NdFeB.
6. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, is characterized in that: the material of described central magnetic yoke (2), long tubular yoke (3), short cylinder shaped yoke (4) and end yoke (5) is high magnetic permeability electrical pure iron.
7. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, is characterized in that: the material of described coil rack (6) is pottery, grouan, fiberglass or rigid plastic.
8. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 1 and 2, is characterized in that: the width of described air gap (7) is 10mm ~ 40mm.
9. the double magnetic circuit two ends symmetrical excitation cylindrical hermetic magnetic field type electromagnetic vibration generator system magnetic structure of eddy current compensation according to claim 2, is characterized in that: the material of described permanent magnet installation sleeve (9) and yoke installation sleeve (10) is pottery, grouan, fiberglass or rigid plastic.
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| US3816777A (en) * | 1972-12-27 | 1974-06-11 | K Metzgar | Electrodynamic force generator |
| US20050155437A1 (en) * | 2001-04-26 | 2005-07-21 | Endress + Hauser Flowtec Ag | Magnetic circuit arrangement for a transducer |
| CN1900660A (en) * | 2006-07-19 | 2007-01-24 | 中国航空工业第一集团公司北京长城计量测试技术研究所 | Electric angle vibrative table |
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