CN104858121B - The open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking compensates - Google Patents
The open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking compensates Download PDFInfo
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Abstract
The open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking compensates belongs to vibration measurement technical field; A kind of rectangle open type magnetic field structure design is proposed, double permanent magnet is symmetrically mounted on inside long yoke and arranges in opposite directions with magnetic pole, symmetrical closed magnetic circuit is constituted by yoke, air gap produces the Magnetic Induction Density Distribution of high evenness, central magnetic yoke is provided with bucking coil, institute's galvanization is contrary with the sense of current in actuating coil, Phase synchronization is followed the tracks of, amplitude is proportional, and the impact of armature-reaction can be tracked compensating by the compensation magnetic field of formation; The present invention can take into account big stroke, highfield uniformity, high thrust and linear electromagnetic driving force specislity, provides the electromagnetic vibration generator system magnetic structure technical scheme of a kind of high accuracy, big stroke for low frequency/superlow frequency vibrating calibration.
Description
Technical field
The invention belongs to vibration measurement technical field, relate generally to the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet 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 by the key equipment of high accuracy vibration calibration. for improving the signal to noise ratio of standard vibration signal, it is ensured that the calibration accuracy of low frequency/superlow frequency vibrating, it is desirable to electromagnetic vibration generator system, under ensureing the premise of thrust and precision, has stroke big 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 therein and difficult point are 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 in total travel, the electromagnetic actuation force size of output is directly proportional to the electric current in actuating coil, and it is unrelated with actuating coil location.
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 vibration table based on linear grating chi feed back control system ", China Patent No.: ZL201110115072.7; 4.WenHe, etal. " Closed-Double-MagneticCircuitforaLong-strokeHorizontalEl ectromagneticVibrationExciter ", IEEETransactionsonMagnetics, 2011,49 (8): 4865-4872).In this technical scheme, magnet (cylinder), central magnetic pole (yoke) and the assembling of tubular outer magnetic pole coaxial line, 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, central magnetic pole is coaxially assemblied in inside tubular outer magnetic pole, and tubular mounting coil is arranged in air gap in central magnetic pole. This technical scheme adopts double; two magnet complementary, leakage field is less, magnet utilization rate is high, it is capable of bigger thrust, bigger stroke and relatively low waveform distortion index, is one of domestic open electromagnetic vibration generator system magnetic structure technical scheme with independent intellectual property right and higher degree of being practical reported.
The Hans-J.vonMartens etc. of German federal physical technique academy (PTB) it is also proposed a kind of large-stroke electromagnetic vibration magnetic structure technical scheme (1.Hans-J.vonMartens, etal, " TraceabilityofVibrationandShockMeasurementsbyLaserInterf erometry ", Measurement, 2000,28:3-20). This technical scheme adopts cylindrical soft magnetic core, cylindrical permanent-magnet body and cylindrical shape soft magnetic tube, the same magnetic pole of two permanent magnets is positioned opposite, be arranged on the two ends of 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 large-stroke electromagnetic vibration of this technical scheme up to 1m, coordinate high-performance permanent magnet and yoke material, it may be achieved the key technical indexes such as the oscillation crosswise ratio of higher level, waveform distortion.
The existence of above two technical scheme is disadvantageous in that: 1) cylindrical shape outer yoke need to carry out long inside dimension processing, processing difficulties, and precision is difficult to ensure that; 2) when adopting cylindrical permanent magnet, permanent magnet needing processing through hole and is bolted in yoke by non-magnetic, assembling is complicated and magnetic circuit can be produced impact; 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 to be sleeved in central magnetic yoke, as permanent magnet adopts the mode assembled afterwards that first magnetizes, assembles very difficult, and assembly precision is difficult to ensure that; The permanent magnet of AlNiCo material can adopt and first assemble the mode magnetized afterwards, but owing to the permanent magnet coercive force of AlNiCo material is relatively low, the effect that magnetizes is restricted, poor performance, seriously restricts mechanical property and the index of magnetic structure.
The KennethJosephMetzgar etc. of APS company of the U.S. proposes a kind of large-stroke electromagnetic vibration magnetic structure technical scheme (KennethJosephMetzgaretal, " ElectrodynamicForceGenerator ", U.S. Patent number: US3816777). The magnetic structure of this technical scheme is to be made up of sub-assemblies 4 groups identical, each sub-assemblies is made up of two wedge-shaped poles sheets, linking block (soft magnetic materials), a magnet, linking block separates and connects the thick end of two wedge-shaped poles sheets, form a pincer structure with long air gap, magnet is arranged in air gap and is fixed on a wedge-shaped poles sheet, and magnet can adopt and first assemble the mode magnetized afterwards. After 4 groups of sub-assemblies stackings between two, adopt bolt that the sub-assemblies of two stackings is fixed the pincer structure forming stacking, again the vice jaw part of the pincer structure of two stackings is docked, and adopt the bolt crouched in wedge-shaped poles sheet that docking structure is connected 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 exists and is disadvantageous in that: 1) whole magnetic structure by multiple structural groupings, be spliced to form, structure is complicated; Fritter permanent magnet need to adopt gluing or alternate manner to be arranged on wedge-shaped poles sheet, assembling complexity, it 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 that, the material of fritter permanent magnet and the coherence request of technique is higher; 3) permanent magnet is directly facing air gap, and its pressure can be magnetized or degaussing by the complementary field produced after actuating coil energising, when passing to larger current in actuating coil, it is easy to make permanent magnet produce irreversible demagnetization; 4) during actuating coil energising, the magnetic flux of coil side increases, opposite side magnetic flux reduces, owing to permanent magnet is directly facing air gap, magnetic flux increases the magnetic circuit of side and is easily saturated, the magnetic flux that now coil side increases is fewer than the magnetic flux that opposite side reduces, the average magnetic induction intensity causing coil position reduces, and then makes 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, design difficult point and it is crucial that designed by rational magnetic structure, the strong Magnetic Induction Density Distribution of high evenness is realized in long air gap, and in total travel, the electromagnetic actuation force of output is directly proportional to size of current after making actuating coil energising, and unrelated 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 after the uniformity of the interior static Magnetic Induction Density Distribution of air gap and coil electricity is difficult to there is further lifting.
Key issue therein has 3 points: in (1) long air gap, the uniformity of main magnetic circuit Magnetic Induction Density Distribution is difficult to ensure that. 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 prominent, exports the linearity of electromagnetic actuation force after serious restriction coil electricity; There is research worker to attempt being compensated by adjustment current waveform, but effect is difficult to ensure that, especially that order magnetic field heterogenicity error compensation effect is poor, compensation method that is real effective and that have relatively high practicability is not yet proposed at present both at home and abroad. (2) impact of armature-reaction is produced after actuating coil energising. Producing complementary field after actuating coil energising, couple with main field superposition, produce to increase magnetic or demagnetizing effect to main field, make diverse location in air gap, the especially Magnetic Induction Density Distribution of actuating coil position become uneven, this phenomenon is called armature-reaction. Being affected by armature-reaction, in stroke, various location is when the electric current density that coil is loaded is identical, and the electromagnetic actuation force of output is inconsistent; And be not directly proportional to electric current density in the size of the same position place electromagnetic actuation force of air gap, exist certain non-linear. Armature-reaction is one of key factor of electromagnetic vibration generator system generation waveform distortion, and its impact increases with the increase driving electric current, is the difficult problem in the design of electromagnetic vibration generator system magnetic structure. (3) long yoke is difficult to ensure that with assembling difficulty, precision with the processing of large scale permanent magnet.In the magnetic structure of large-stroke electromagnetic vibration, long central magnetic yoke need to adopt reasonable manner to fix with two ends supporting way, for ensureing seriality and the integrity 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; To obtain bigger electromagnetic actuation force simultaneously, be generally adopted the strong magnetic permanent magnet of the materials such as NdFeB, strong magnetic permanent magnet part assembling process needs to overcome huge magnetic attraction, is a difficult problem of this technical field.
Additionally, in the work process of large-stroke electromagnetic vibration, what pass in actuating coil is that alternation drives electric current, and current amplitude is maximum up to tens amperes, and coil moves back and forth with sinusoidal rule in the axial direction in long air gap. Can in yoke surfaces according to the alternating magnetic field that Theory of Electromagnetic Field, alternating current and coil movement produce, especially adjacent with air gap yoke surfaces can produce current vortex, causes eddy-current loss. Can produce power reaches as high as the thermal losses of a few hectowatt to eddy-current loss 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 alternating magnetic field and current vortex cause on the other hand, can make the performance indications of reality produce relatively large deviation with the result obtained by traditional design theory and analysis 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, restricted by the problems referred to above, the standard low frequency vibration that prior art produces is adopted to be difficult to there is breakthrough again in the indexs such as waveform distortion, it is difficult to meet the high-precision calibration of low frequency/superlow frequency vibrating, the demand of the vibration calibration with very low frequency and ultraprecise feature especially of future generation. Therefore, how by the innovation of the links such as method, structure, material and optimization design, it is proposed to having 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
It is an object of the invention to the problems referred to above existed for prior art, the open magnetic field type electromagnetic vibration generator system magnetic structure technical scheme of the centripetal excitation rectangle of double permanent magnet that a kind of magnetic field tracking compensates is provided, the present invention has simple in construction, precision is high, big stroke can be taken into account, highfield uniformity, high thrust and linear electromagnetic driving force specislity, can effectively solve prior art Problems existing with not enough, especially there is the characteristic that standard vibration waveform distortion is affected by prominent compensation armature-reaction, thus providing a kind of high accuracy for low frequency/superlow frequency vibrating calibration, large-stroke electromagnetic vibration magnetic structure.
The technical solution of the present invention is:
The open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that a kind of magnetic field tracking compensates, by central magnetic yoke, permanent magnet, outer yoke, end yoke, coil rack and actuating coil are constituted, 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, constitute 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, two strip permanent magnet symmetry adhesive asserably are 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 two equal in widths 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, actuating coil passes to accurate controlled driving electric current, central magnetic yoke is wound with bucking coil equably, the electric current led in bucking coil is 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 adopting two square shape cross sections, non-magnet_conductible material, two yoke installing frames it is sleeved on the two ends of central magnetic yoke and is rigidly connected with central magnetic yoke, by fixing two yoke installing frames, central magnetic yoke being fixed in the way of the support of two ends.
Described permanent magnet is to adopt multiple fritter permanent magnets, is spliced to form in the way of bonding.
The technological innovation of the present invention and the good result of generation are in that:
(1) 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 are easily guaranteed that processing and assembly precision; The mode first magnetizing owing to permanent magnet can adopt, assembling afterwards, therefore can adopt the high-performance permanent magnet of the materials such as NdFeB, thus high gap density and big electromagnetic actuation force can be obtained; The problems such as solving long size cylindrical shape yoke in prior art to be difficult to, part processing is difficult to ensure that with assembly precision, strong magnetic permanent magnet assembling difficulty;The Magnetic Induction Density Distribution that can make main magnetic circuit in long air gap realizes higher uniformity Index. This is one of present invention innovative point being different from prior art.
(2) 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 that the present invention is different from the two of the innovative point of prior art.
(3) 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, generation complementary field after actuating coil energising can be affected the impact of the phenomenon of main magnetic field distribution, i.e. armature-reaction and carry out synchronized tracking compensation by the compensation magnetic 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 that the present invention distinguishes the three of the innovative point of prior art.
(4) in the present invention strip large scale permanent magnet can adopt fritter permanent magnet by first splice magnetize afterwards in the way of obtain, the sintering of large scale permanent magnet can be substantially reduced, process and the difficulty magnetized; Solve large scale cylinder in prior art, cylindrical permanent-magnet body sintering, the problems such as difficulty of processing and magnetize. This is that the present invention is different from the four of the innovative point of prior art.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking compensates;
Fig. 2 is the top view of the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet 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 central magnetic yoke installing fixing schematic diagram;
Fig. 6 is the structural representation of yoke installing frame;
Fig. 7 is the structural representation of one embodiment of coil rack;
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 open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that a kind of magnetic field tracking compensates, by central magnetic yoke 2, permanent magnet 3, outer yoke 4, end yoke 5, coil rack 6 and actuating coil 8 are constituted, 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, constitute 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 two equal in widths 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, actuating coil 8 passes to accurate controlled driving electric current, central magnetic yoke 2 is wound with bucking coil 27 equably, the electric current led in bucking coil 27 is 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 the yoke installing frame 10 adopting two square shape cross sections, non-magnet_conductible material, two yoke installing frames 10 it is sleeved on the two ends of central magnetic yoke 2 and is rigidly connected with central magnetic yoke 2, by fixing two yoke installing frames 10, central magnetic yoke 2 being fixed in the way of the support of two ends.
Described permanent magnet 3 is to adopt multiple fritter permanent magnets, is spliced to form in the way of bonding.
One embodiment of the present of invention is provided below in conjunction with Fig. 1��Fig. 4. In the present embodiment, the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking compensates is for producing the standard low frequency vibration of horizontal direction. Permanent magnet 3 is the strong magnetic permanent magnet 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, it is symmetrically mounted between two outer yokes 4 and central magnetic yoke 2, on two surfaces that two outer yokes 4 are relative, adopts bonding way assembling fixing. 2, two outer yokes of central magnetic yoke 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 3, two outer yokes of 2, two permanent magnets 4, two end yoke 5 is rectangle, central magnetic yoke 2 and two end yokes 5 and coaxially assembles. Being 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 2, two outer yokes 4 of central magnetic yoke all adopt screw to be rigidly connected with two end yokes 5. 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, the magnetic line of force paths traversed of the formed main magnetic circuit of permanent magnet excitation is as shown in Figure 4. For the first magnetic circuit 11, the magnetic line of force, from the N pole of permanent magnet 3, sequentially passes through the outer yoke 4 of central magnetic yoke 2, end yoke 5 and this permanent magnet 3 homonymy, and the S pole being then return 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 is to adopt 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/mm2. 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, output virtual value is up to the power current of tens A and is loaded in actuating coil 8, according to Theory of Electromagnetic Field, in magnetic field, the actuating coil 8 of energising is subject to horizontal direction Lorentz force effect, thus exporting accurate controlled electromagnetic actuation force. Can the size and Orientation of accurate control electromagnetic actuation force by controlling the alive size and Orientation of institute. If control signal adopts the standard sine signal of telecommunication, actuating coil 8 and coil rack 6 will produce standard low frequency sinusoidal vibration vertically 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 that armature-reaction, armature-reaction are the principal elements 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 is to adopt 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/mm2The electric current led in bucking coil 27 is contrary with the sense of current in actuating coil 8, Phase synchronization is followed the tracks of, amplitude becomes to determine ratio, the complementary field that actuating coil 8 produces can be carried out synchronized tracking compensation by the produced magnetic field that compensates of bucking coil 27, can be effectively improved the armature-reaction impact 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. Making coil rack 6 and actuating coil 8 be sleeved in central magnetic yoke 2 and have longer stroke, long sized central yoke 2 must carry out installing in the way of the support of two ends fixes. 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, is fixed by screws on base component or other parts of electromagnetic vibration generator system.
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 uniformly close to be wound on coil rack 6, and the two ends processing of coil rack 6 has small boss, is used for preventing actuating coil 8 from coming off.
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. Actual implementation process may be used without the lightening hole of densely covered other form such as circular hole, small square hole.
Claims (3)
1. the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that a magnetic field tracking compensates, by central magnetic yoke (2), permanent magnet (3), outer yoke (4), end yoke (5), coil rack (6) and actuating coil (8) are constituted, 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 with two respectively, constitute 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 two equal in widths 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, actuating coil (8) passes to accurate controlled driving electric current, central magnetic yoke (2) is wound with bucking coil (27) equably, the electric current led in bucking coil (27) is contrary with the sense of current in actuating coil (8), Phase synchronization, amplitude becomes to determine ratio.
2. the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking according to claim 1 compensates, it is characterized in that: the mounting means of described central magnetic yoke (2) is the yoke installing frame (10) adopting two square shape cross sections, non-magnet_conductible material, two yoke installing frames (10) it is sleeved on the two ends of central magnetic yoke (2) and is rigidly connected with central magnetic yoke (2), by fixing two yoke installing frames (10), central magnetic yoke (2) being fixed in the way of the support of two ends.
3. the open magnetic field type electromagnetic vibration generator system magnetic structure of the centripetal excitation rectangle of double permanent magnet that magnetic field tracking according to claim 1 and 2 compensates, it is characterized in that: described permanent magnet (3) is to adopt multiple fritter permanent magnets, is spliced to form in the way of bonding.
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| US3816777A (en) * | 1972-12-27 | 1974-06-11 | K Metzgar | Electrodynamic force generator |
| CN100594990C (en) * | 2007-06-12 | 2010-03-24 | 浙江大学 | Two magnetic route structure of large-stroke electromagnetic vibration |
| CN101342528B (en) * | 2008-05-16 | 2010-11-17 | 浙江大学 | Electromagnetic vibration table |
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