CN104858121A - Magnetic circuit structure for rectangular open-type magnetic field of electromagnetic shaking table by adopting double rows of permanent magnets with centripetal excitation for tracking and compensation of magnetic field - Google Patents
Magnetic circuit structure for rectangular open-type magnetic field of electromagnetic shaking table by adopting double rows of permanent magnets with centripetal excitation for tracking and compensation of magnetic field Download PDFInfo
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Abstract
Provided is a magnetic circuit structure for a rectangular open-type magnetic field of an electromagnetic shaking table by adopting double rows of permanent magnets with centripetal excitation for tracking and compensation of the magnetic field, pertaining to the technical field of vibration and measurement. Provided is structural design of the rectangular open-type magnetic field. The double rows of permanent magnets are symmetrically arranged at insides of long magnet yokes with same magnetic poles oppositely arranged. By means of magnet yokes, a symmetrical closed magnetic circuit is formed. Magnetic inductive intensity distribution with high evenness is generated in an air gap. Compensating coils are arranged on a central magnet yoke. Galvanized electric current is opposite to electric current of working coils in direction and proportionate to phase synchronous tracking and amplitude. A formed compensating magnetic field is used for tracking and compensating for influence of armature reaction. Considerations are taken into large stroke, uniformity of a high magnetic field, high thrust and features of linear electromagnetic driving force so that a technical scheme, with high precision and large stroke, of the magnetic circuit structure of the electromagnetic shaking table is provided for low frequency/ ultra-low frequency vibration calibration.
Description
Technical field
The invention belongs to vibration measurement technical field, relate generally to the centripetal excitation rectangle of the double permanent magnet open magnetic field type electromagnetic vibration generator system magnetic structure that a kind of magnetic field tracking compensates.
Background technology
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.The electromagnetic vibration generator system producing standard vibration signal is the key equipment carrying out high accuracy vibration calibration.For improving the signal to noise 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 actuating coil, and have nothing to do with the position residing for actuating 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 shake 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 line 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 rate 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 actuating 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 oscillation crosswise 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 materials), 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 (actuating 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 operating point of this place's permanent magnet, and the uniformity 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 actuating coil energising can magnetize or degaussing to its pressure, when passing to larger current in actuating coil, easily makes permanent magnet produce irreversible demagnetization; 4) during actuating 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 actuating coil be energized is directly proportional to size of current, and have nothing to do with actuating 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 uniformity 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 uniformity 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 is very outstanding, exports the linearity of electromagnetic actuation force after serious restriction coil electricity; Have researcher 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 actuating coil energising.Produce complementary field after actuating 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 actuating 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/screwed 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 fragile 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 actuating coil is alternation drive current, and current amplitude is maximum reaches tens amperes, and coil moves back and forth with sinusoidal rule in the axial direction in long air gap.According to Theory of Electromagnetic Field, the alternating magnetic field that alternating 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 caloric value is surprising, and then brings a series of thermal agitation and thermal deformation problem; The transient field problem that another aspect alternating magnetic field and current vortex cause, can make actual performance indications produce relatively large deviation with the result obtained by traditional design theory and analytical method, 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 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 to have super large stroke, ultralow operating frequency and high-precision electromagnetic vibration generator system magnetic structure technical scheme, 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, the centripetal excitation rectangle of the double permanent magnet providing a kind of magnetic field tracking to compensate open magnetic field type electromagnetic vibration generator system magnetic structure technical scheme, it is simple that the present invention has structure, precision is high, Long Distances can be taken into account, highfield uniformity, high thrust and linear electromagnetic driving force specislity, effectively can solve prior art Problems existing with not enough, especially there is the characteristic that outstanding compensation armature-reaction affects standard vibration waveform distortion, thus provide a kind of high accuracy for the calibration of low frequency/superlow frequency vibrating, large-stroke electromagnetic vibration magnetic structure.
Technical solution of the present invention is:
The centripetal excitation rectangle of the double permanent magnet that a kind of magnetic field tracking compensates open magnetic field type electromagnetic vibration generator system magnetic structure, by central magnetic yoke, permanent magnet, outer yoke, end yoke, coil rack and actuating coil are formed, overall one-tenth axially symmetric structure, central magnetic yoke, permanent magnet, the cross section of outer yoke and end yoke is rectangle, the cross section of coil rack is square shape, the two ends of two outer yokes hold yoke to be rigidly connected with two respectively, form square shape magnetic yoke structure, central magnetic yoke is arranged on the long axis of square shape magnetic yoke structure, two ends hold yoke to be rigidly connected with two respectively, the length of permanent magnet is less than the length of outer yoke, the symmetrical adhesive asserably of two strip permanent magnet is at two between outer yoke and central magnetic yoke, on two surfaces that two outer yokes are relative, the same magnetic pole of two permanent magnets is positioned opposite, separated by the air gap of the width such as two between permanent magnet and central magnetic yoke for two, coil rack is sleeved in central magnetic yoke slidably, coil rack is wound with actuating coil equably, accurate controlled drive current is passed in actuating coil, central magnetic yoke is wound with bucking coil equably, in bucking coil the electric current that leads to contrary with the sense of current in actuating coil, Phase synchronization is followed the tracks of, amplitude becomes to determine ratio.
The mounting means of described central magnetic yoke is the yoke installing frame of employing two square shape cross sections, non-magnet_conductible material, two yoke installing frames being sleeved on the two ends of central magnetic yoke and being rigidly connected with central magnetic yoke, by fixing two yoke installing frames, the mode that central magnetic yoke supports with two ends being fixed.
Described permanent magnet adopts multiple fritter permanent magnet, is spliced to form in bonding mode.
The good result of technological innovation of the present invention and generation is:
(1) the present invention proposes the magnetic structure design in the open magnetic field of a kind of rectangle, and the cross section of permanent magnet and yoke part is rectangle, and magnetic structure is simple and reliable, and parts easily ensure 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 high gap density and large electromagnetic actuation force can be obtained; The problems such as solve long size cylindrical shape yoke in prior art and be difficult to processing, part processing is difficult to ensure with assembly precision, strong magnetic permanent magnet assembling difficulty;
the Magnetic Induction Density Distribution of main magnetic circuit in long air gap can be made to realize higher uniformity index.This is one of the present invention's innovative point being different from prior art.
(2) the present invention adopts yoke installing frame reliably can install fixing with two ends supporting way by long central magnetic yoke, and assembling process is simple and reliable, greatly reduces assembly difficulty;
solve long central magnetic yoke and fixing problem is reliably installed.This is the innovative point two that the present invention is different from prior art.
(3) the present invention arranges bucking coil in central magnetic yoke, institute's galvanization is contrary with the sense of current loaded in actuating coil, Phase synchronization is followed the tracks of, amplitude is proportional, theoretical research and experimental result all show, synchronized tracking compensation can be carried out to the impact producing complementary field after actuating coil energising and affect phenomenon, the i.e. armature-reaction of main magnetic field distribution in the compensating field that bucking coil is formed;
the linear electromagnetic driving force specislity of approximate ideal can be realized, efficiently solve armature-reaction and electromagnetic vibration generator system outputting standard is shaken that moves waveform distortion affects problem.This is the innovative point three that the present invention distinguishes prior art.
(4) in the present invention, strip large scale permanent magnet can adopt fritter permanent magnet 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 that large scale in prior art is cylindrical, cylindrical permanent-magnet body sintering, the problems such as difficulty of processing and magnetize.This is the innovative point four that the present invention is different from prior art.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the centripetal excitation rectangle of the double permanent magnet open magnetic field type electromagnetic vibration generator system magnetic structure that magnetic field tracking compensates;
Fig. 2 is the top view of the centripetal excitation rectangle of the double permanent magnet open magnetic field type electromagnetic vibration generator system magnetic structure that magnetic field tracking compensates;
Fig. 3 is the close-up schematic view of Fig. 2;
Fig. 4 is the schematic diagram of permanent magnet pole arrangement and main magnetic circuit;
Fig. 5 adopts yoke installing frame to carry out installing fixing schematic diagram to central magnetic yoke;
Fig. 6 is the structural representation of yoke installing frame;
Fig. 7 is the structural representation of a coil rack embodiment;
Fig. 8 is the structural representation of another embodiment of coil rack.
In figure, piece number illustrates: 2 central magnetic yoke, 3 permanent magnets, 4 outer yokes, 5 end yokes, 6 coil racks, 7 air gaps, 8 actuating coils, 10 yoke installing frames, 11 first magnetic circuits, 12 second magnetic circuits, 27 bucking coils.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, and provides embodiment.
The centripetal excitation rectangle of the double permanent magnet that a kind of magnetic field tracking compensates open magnetic field type electromagnetic vibration generator system magnetic structure, by central magnetic yoke 2, permanent magnet 3, outer yoke 4, end yoke 5, coil rack 6 and actuating coil 8 are formed, overall one-tenth axially symmetric structure, central magnetic yoke 2, permanent magnet 3, the cross section of outer yoke 4 and end yoke 5 is rectangle, the cross section of coil rack 6 is square shape, the two ends of two outer yokes 4 hold yoke 5 to be rigidly connected with two respectively, form square shape magnetic yoke structure, central magnetic yoke 2 is arranged on the long axis of square shape magnetic yoke structure, two ends hold yoke 5 to be rigidly connected with two respectively, the length of permanent magnet 3 is less than the length of outer yoke 4, two symmetrical adhesive asserably of strip permanent magnet 3 are between two outer yokes 4 and central magnetic yoke 2, on two surfaces that two outer yokes 4 are relative, the same magnetic pole of two permanent magnets 3 is positioned opposite, separated by the air gap 7 of the width such as two between two permanent magnets 3 and central magnetic yoke 2, coil rack 6 is sleeved in central magnetic yoke 2 slidably, coil rack 6 is wound with actuating coil 8 equably, accurate controlled drive current is passed in actuating coil 8, central magnetic yoke 2 is wound with bucking coil 27 equably, in bucking coil 27 the electric current that leads to contrary with the sense of current in actuating coil 8, Phase synchronization is followed the tracks of, amplitude becomes to determine ratio.
The mounting means of described central magnetic yoke 2 is yoke installing frames 10 of employing two square shape cross sections, non-magnet_conductible material, two yoke installing frames 10 being sleeved on the two ends of central magnetic yoke 2 and being rigidly connected with central magnetic yoke 2, by fixing two yoke installing frames 10, the mode that central magnetic yoke 2 supports with two ends being fixed.
Described permanent magnet 3 adopts multiple fritter permanent magnet, is spliced to form in bonding mode.
One embodiment of the present of invention are provided below in conjunction with Fig. 1 ~ Fig. 4.In the present embodiment, the centripetal excitation rectangle of the double permanent magnet that magnetic field tracking compensates open magnetic field type electromagnetic vibration generator system magnetic structure vibrates for generation of the standard low frequency of horizontal direction.Permanent magnet 3 is strong magnetic permanent magnets of NdFeB material, the NdFeB material residual magnetization adopted is 1.17T, coercivity is 890kA/m, the N of two permanent magnets 3 is extremely positioned opposite, on two surfaces that symmetry is arranged between two outer yokes 4 and central magnetic yoke 2, two outer yokes 4 are relative, bonding way is adopted to be mounted with.Central magnetic yoke 2, two outer yokes 4, two end yoke 5 adopts high magnetic permeability electrical pure iron material DT4C to make, and maximum relative permeability can reach 12000, and saturation flux amount is about 2.5T.The cross section of central magnetic yoke 2, two permanent magnets 3, two outer yokes 4, two end yoke 5 is rectangle, and central magnetic yoke 2 and two end yokes 5 are coaxially assembled.Separated by two long air gaps 7 between central magnetic yoke 2 and two permanent magnets 3, the width of air gap 7 is 15mm.The two ends of central magnetic yoke 2, two outer yokes 4 and two hold yoke 5 all to adopt screw to be rigidly connected.Two strip permanent magnet 3 form two symmetrical closed magnetic circuits by closed magnetic yoke structure, produce the strong Magnetic Induction Density Distribution of high evenness in air gap 7.
In the present embodiment, permanent magnet excitation formed the magnetic line of force of main magnetic circuit process path as shown in Figure 4.For the first magnetic circuit 11, the magnetic line of force from the N pole of permanent magnet 3, successively through central magnetic yoke 2, end yoke 5, with the outer yoke 4 of this permanent magnet 3 homonymy, the S pole then getting back to permanent magnet 3 forms closed magnetic circuit.In figure, the first magnetic circuit 11 and the second magnetic circuit 12 are in upper and lower symmetric form.
Coil rack 6 adopts 99 aluminium oxide ceramics to make, and cross section is square shape, and the square aperture at center makes coil rack 6 can be sleeved on slidably in central magnetic yoke 2.Actuating coil 8 adopts insulated copper enamel-covered wire to be wound at coil rack 6 outer surface, and cross section is also square 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 actuating coil 8 have two limits to be arranged in air gap 7.During electromagnetic vibration generator system work, control signal is after power amplifier amplifies, the power current that output virtual value is up to tens A is loaded in actuating coil 8, according to Theory of Electromagnetic Field, the actuating 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 the standard sine signal of telecommunication, actuating coil 8 and coil rack 6 produce standard low frequency sinusoidal vibration vertically by under the effect of electromagnetic actuation force.
During electromagnetic vibration generator system work, complementary field can be produced after actuating coil 8 loading current, this complementary field can affect the Distribution of Magnetic Field of the main magnetic circuit that permanent magnet 3 excitation produces, this phenomenon is called armature-reaction, and armature-reaction is the principal element of the waveform distortion affecting the vibration of electromagnetic vibration generator system outputting standard.The present invention is provided with bucking coil 27 in central magnetic yoke 2, and bucking coil 27 adopts insulated copper enamel-covered wire to be wound at central magnetic yoke 2 outer surface, and cross section is also square shape, and thickness is 1.5mm, and logical maximum current density is 4A/mm
2in bucking coil 27 the electric current that leads to contrary with the sense of current in actuating coil 8, Phase synchronization is followed the tracks of, amplitude becomes to determine ratio, synchronized tracking compensation can be carried out to the complementary field that actuating coil 8 produces in the compensating field that bucking coil 27 produces, and effectively can improve the impact of armature-reaction on the waveform distortion that electromagnetic vibration generator system outputting standard vibrates.
An embodiment of yoke installing frame is provided below in conjunction with Fig. 5, Fig. 6.Coil rack 6 and actuating 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 installing frame 10 adopts ceramic material to make, cross section is square shape, two yoke installing frames 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 installing frames 10 there is screwed hole, on the base component being fixed by screws in electromagnetic vibration generator system or other parts.
Fig. 7 gives an embodiment of coil rack.In the present embodiment, coil rack 6 adopts 99 alumina ceramic materials, and cross section is square shape, and wall thickness is 5mm, and the square aperture at its center makes coil rack 6 can be sleeved on slidably in central magnetic yoke 2.Actuating 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 actuating coil 8.
Fig. 8 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 oblong aperture, is uniformly distributed along thin-walled surrounding.Also the lightening hole of other forms such as densely covered circular hole, small square hole can be adopted in actual implementation process.
Claims (3)
1. the centripetal excitation rectangle of the double permanent magnet open magnetic field type electromagnetic vibration generator system magnetic structure of a magnetic field tracking compensation, by central magnetic yoke (2), permanent magnet (3), outer yoke (4), end yoke (5), coil rack (6) and actuating coil (8) are formed, overall one-tenth axially symmetric structure, it is characterized in that: central magnetic yoke (2), permanent magnet (3), the cross section of outer yoke (4) and end yoke (5) is rectangle, the cross section of coil rack (6) is square shape, the two ends of two outer yokes (4) hold yoke (5) to be rigidly connected respectively with two, form square shape magnetic yoke structure, central magnetic yoke (2) is arranged on the long axis of square shape magnetic yoke structure, two ends hold yoke (5) to be rigidly connected respectively with two, the length of permanent magnet (3) is less than the length of outer yoke (4), two symmetrical adhesive asserably of strip permanent magnet (3) are between two outer yokes (4) and central magnetic yoke (2), on two surfaces that two outer yokes (4) are relative, the same magnetic pole of two permanent magnets (3) is positioned opposite, separated by the air gap (7) of the width such as two between two permanent magnets (3) and central magnetic yoke (2), coil rack (6) is sleeved in central magnetic yoke (2) slidably, coil rack (6) is wound with equably actuating coil (8), accurate controlled drive current is passed in actuating coil (8), central magnetic yoke (2) is wound with equably bucking coil (27), in bucking coil (27) the electric current that leads to contrary with the sense of current in actuating coil (8), Phase synchronization is followed the tracks of, amplitude becomes to determine ratio.
2. the centripetal excitation rectangle of double permanent magnet that magnetic field tracking according to claim 1 compensates opens magnetic field type electromagnetic vibration generator system magnetic structure, it is characterized in that: the mounting means of described central magnetic yoke (2) is the yoke installing frame (10) of employing two square shape cross sections, non-magnet_conductible material, two yoke installing frames (10) being sleeved on the two ends of central magnetic yoke (2) and being rigidly connected with central magnetic yoke (2), by fixing two yoke installing frames (10), the mode that central magnetic yoke (2) supports with two ends being fixed.
3. the centripetal excitation rectangle of double permanent magnet that magnetic field tracking according to claim 1 and 2 compensates opens magnetic field type electromagnetic vibration generator system magnetic structure, it is characterized in that: described permanent magnet (3) adopts multiple fritter permanent magnet, is spliced to form in bonding mode.
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|---|---|---|---|---|
| CN113262972A (en) * | 2021-05-17 | 2021-08-17 | 湖南大学 | Electromagnetic structure and electromagnetic transducer |
| CN113257544A (en) * | 2021-05-18 | 2021-08-13 | 赵鑫堂 | Core type permanent magnetic transformer |
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| CN104858121B (en) | 2016-06-08 |
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