CN101145422A - Magnetic path and manufacturing method and device thereof - Google Patents
Magnetic path and manufacturing method and device thereof Download PDFInfo
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- CN101145422A CN101145422A CNA2006101538286A CN200610153828A CN101145422A CN 101145422 A CN101145422 A CN 101145422A CN A2006101538286 A CNA2006101538286 A CN A2006101538286A CN 200610153828 A CN200610153828 A CN 200610153828A CN 101145422 A CN101145422 A CN 101145422A
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Abstract
The invention is to efficiently produce a high-performance small-sized magnetic circuit capable of facilitating the insertion of a magnet into a magnetic yoke member. In the inventive magnetic circuit, a plurality of permanent magnet sheets (1), with a partially arced sectional shape, are magnetically absorbed on an inner circumferential surface (4a) of a cylindrical magnetic yoke member (4), and simultaneously a fold-back portion (4b), adapted to be folded back at a substantially right angle, is formed at one end side of the cylindrical magnetic yoke member (4), and the end surfaces of the permanent magnet sheets (1) are also magnetically absorbed with respect to the fold-back portion (4b). The inventive magnetic circuit is fabricated by magnetically absorbing the permanent magnet sheets with the partially arced sectional shape (C-shaped permanent magnet sheets 1) to the circumferential surface of a central bar (2) made of magnetic materials, and arranging the magnetic yoke member (4) oppositely to the C-shaped permanent magnet sheets 1 under this conditions; and then drawing the central bar (2) under such condition that the C-shaped permanent magnet sheets 1 are positioned by using a non-magnetic supporting tool (3), and allowing the C-shaped permanent magnet sheets 1 to be magnetically absorbed and fixed on the magnetic yoke member (4). The inventive magnetic circuit is used in actuators or loud-speakers.
Description
Technical field
The present invention relates to transformation of electrical energy is the employed magnetic circuit such as magnet-type actuator of kinetic energy and manufacture method thereof, manufacturing installation, relates to the improvement of permanent magnet to the charging method of yoke parts.Also relate to the actuator or the loud speaker that use magnetic circuit.
Background technology
For example in various business automation equipments or linear motor (voice coil motor), control appliance etc., develop various types of actuators.It specifically is the movable actuator of movable actuator such as coil, iron core or permanent magnet etc.In all case, all be by combination yoke and coil, and permanent magnet constitute actuator.
In the actuator that uses permanent magnet, the high precision int of control or the raising of propulsive force etc. becomes problem, is attempting managing changing structure and is coming corresponding with it.For example, as actuator that can High Accuracy Control, the linear actuator (for example, opening flat 6-284670 communique etc. with reference to patent documentation 1-spy) that outer yoke and the inner yoke that proposes to be formed by the package coil, the cylindric permanent magnet that reaches diametrical magnetization constitute.Perhaps, as the actuator that can improve propulsive force, proposition is by side yoke, first permanent magnet and have the linear actuator (for example, opening flat 5-49226 communique etc. with reference to patent documentation 2-spy) that second permanent magnet of the polarity opposite with first permanent magnet constitutes.
In the invention of patent documentation 1 record, adopt following structure, between pair of magnetic yoke with the liner arranged coaxial, promptly package drives and uses coil on outer yoke inner peripheral surface and inner yoke outer peripheral face, cylindric permanent magnet with diametrical magnetization between a pair of driving of disposing relatively is with coil disposes as the moving element that is supported by magnet holder, and the output shaft that connects the axle center part of inner yoke is connected with magnet holder.And, can provide thus and can realize high-precision control and miniaturization and, also have the high linear actuator of versatility.
In the invention of patent documentation 2 records, make following structure, promptly on the inner peripheral surface of the side yoke that is formed with end open circles tubular by strong magnetic material, be fixed with the permanent magnet that forms the open circles tubular, and the bottom in the side yoke will be given prominence to setting coaxially and be constituted magnetic circuit by columned central magnetic yoke and side yoke that strong magnetic material constitutes, move axially in the magnetic space that is formed between permanent magnet and the central magnetic yoke moving element is set freely.And, permanent magnet is by being located near from the bottom of side yoke first permanent magnet to the peristome and constituting with this first magnet opposite polarity ground magnetization and near be located at the peristome of side yoke second permanent magnet, on moving element, face separately and drive coil and magnetic test coil are set with first permanent magnet and second permanent magnet, realize small-sized, light weight thus, and high thrust, the linear actuator that the linearity and reliability are high.
; in the invention of patent documentation 1 or patent documentation 2 records; in all case all on the magnetic circuit that constitutes actuator, use permanent magnet cylindraceous; but in the occasion of for example using the rare-earth sintered magnet etc. of performance high magnetic force as permanent magnet; above-mentioned cylindric as if making, then corresponding generation is big difficult on making.
Rare-earth sintered magnet is generally by the powder metallurgic method manufacturing, with raw material alloy powder in magnetic field with cylindric compression molding, and by its sintering, Ageing Treatment are made.At this moment, shrink easily, be out of shape in the stage of sintered shaped body.If deform, then the circularity step-down needs external diameter to grind when packing above-mentioned actuator into or the internal diameter grinding, causes the increase of man-hour or manufacturing cost.And cylindric as if the magnet shape is made, then the relative weight volume becomes big, so the quantity that can handle together reduces, sintering cost etc. also increase.
And also according to the structure of magnetic circuit, but for example will be installed in rare-earth sintered magnet cylindraceous on the yoke time, if the dimensional accuracy deficiency of external diameter or internal diameter, then in fact the contact area of yoke very little relatively.Its result, the pull-out capacity of yoke reduces significantly relatively, might need to use simultaneously bonding agent to be adhesively fixed.Have, the magnetization of magnet also becomes problem again.Even magnet cylindraceous is magnetized in advance, even and set back magnetization on yoke, in the occasion of magnet cylindraceous, also need bigger magnetizing assembly.
Have again, be used for the permanent magnet cylindraceous of the magnetic circuit of actuator, generally make the magnet of directed (so-called radial directed) diametrically.In the rare-earth sintered magnet cylindraceous of this radial directed because special orientation, for example thickness do thin crackle, breach etc., the tendency that has rate of finished products to reduce greatly of then when sintering, often taking place.If the high performance of consideration actuator or miniaturization etc., then the reduction of above-mentioned rate of finished products becomes the big main cause that hinders it.
Summary of the invention
The present invention proposes in view of above-mentioned existing situation.Promptly, the object of the invention is, even the occasion of rare-earth sintered magnet being used as permanent magnet for example is provided, correspondingly do not produce the difficulty on making yet, and can realize the magnetic circuit of high performance and miniaturization, have, the object of the invention is to provide manufacture method and the manufacturing installation that can make above-mentioned magnetic circuit effectively again.And the object of the invention is to provide actuator and the loud speaker of realizing high performance by the above-mentioned magnetic circuit of packing into.
In order to achieve the above object, magnetic circuit of the present invention is characterised in that: a plurality of permanent magnet pieces of the section configuration with partial arc shape magnetically are adsorbed, above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces also magnetically is adsorbed.
And, manufacture method of the present invention is characterised in that: the permanent magnet pieces that will have the section configuration of partial arc shape magnetically adsorbs at the side face of the center bar that is formed by magnetic material, under this state, make yoke parts and above-mentioned permanent magnet pieces opposed after, with above-mentioned permanent magnet pieces by the state of non magnetic supporting tool restriction site under the above-mentioned center bar of drawing, on above-mentioned yoke parts, above-mentioned permanent magnet pieces is magnetically adsorbed and fixes.
Have, the manufacturing installation of magnetic circuit of the present invention is characterised in that to possess again: formed and had a center bar that the permanent magnet pieces of the section configuration of partial arc shape magnetically is adsorbed on side face by magnetic material; With become ring-type, on the side face of above-mentioned center bar, set with this center bar is coaxial, with the non magnetic supporting tool of the end face butt of permanent magnet pieces on the side face that is adsorbed on center bar, the above-mentioned relatively non magnetic supporting tool of above-mentioned center bar inserts dismounting freely.
In the present invention, at first first, do not use permanent magnet cylindraceous, and be to use with drum with the regulation angle cut apart and have the section configuration of partial arc shape permanent magnet pieces (below, be called C type permanent magnet pieces), by making up it, making for example roughly cylindric is basic idea.
Above-mentioned C type permanent magnet pieces is even also make easily in the occasion of using rare-earth sintered magnet etc.For example, even do thickness thin, crackle during sintering or breach etc. are also few, and rate of finished products is made well.Distortion during sintering etc. is suppressed more significantly with occasion cylindraceous.And C type permanent magnet pieces can be overlapping and handle at thickness direction, so can once magnetize processing, magnetizing time shortens significantly.
Constitute magnetic circuit of the present invention by this C type permanent magnet pieces is magnetically adsorbed on the yoke parts, for example only each permanent magnet pieces is magnetically adsorbed here, then the stationary state at permanent magnet pieces stays instability.Therefore, in the present invention, show the reflex part that the right angle turns back greatly, the end face of each permanent magnet pieces is magnetically adsorbed distolateral a setting of yoke parts.Thus, do not use bonding agent to realize firm set state, become the structure that vibration also can fully be born such as falling.With rare earth element magnet described later, particularly R-T-B based rare earth sintered magnet is used in the present invention, so because magnetic force is very high effectively.
On the other hand, in the magnetic circuit that uses C type permanent magnet pieces, for example will make the cylindric a plurality of C type permanent magnet pieces of combination that need as mentioned above, the quantity of the flat thin magnet that must handle increases, and might make to packing into of yoke parts etc. numerous and diverse.Mutual magnetic absorption of flat thin magnet or repulsion, accurately configuration is very difficult so make up these.
Therefore, in the present invention, as mentioned above, utilize to discharge the absorption of the above-mentioned magnetic that will carry out to the absorption of the magnetic of center bar and by the drawing center bar, carry out permanent magnet pieces packing into to the yoke parts.That is, in the present invention, the center bar that configuration is formed by magnetic material, for example making on its side face in advance, the magnetized C type of thickness direction permanent magnet pieces magnetically adsorbs.For example when C type permanent magnet pieces is made up cylindricly, on the side face of above-mentioned center bar, attach a plurality of C type permanent magnet pieces.Under this state, center bar is inserted the yoke parts, make above-mentioned C type permanent magnet pieces relative with the inner peripheral surface of yoke parts.Make C type permanent magnet pieces not movably by non magnetic supporting tool restriction site, drawing center bar thereafter.So the attraction of the magnetic that acts between C type permanent magnet pieces and center bar is released, C type permanent magnet pieces becomes free state.At this moment, the yoke parts form with magnetic material, the attraction force acts of magnetic between above-mentioned C type permanent magnet pieces and yoke, and the further inner peripheral surface of yoke parts of C type permanent magnet pieces is fixed by magnetic adsorptive power.
Like this, in the present invention, insert and the shirtsleeve operation of drawing to the yoke parts to central shaft absorption, center bar with C type permanent magnet pieces, for example a plurality of C type permanent magnet pieces determine the position exactly and are absorbed and fixed on the yoke parts.Therefore, carry out magnet is inserted the yoke parts continuously and in short time, and the magnetization after not needing magnet to insert.
Magnetic circuit of the present invention with said structure can be used for for example actuator or loud speaker, realizes the high performance of actuator or loud speaker thus.Promptly, actuator of the present invention is the actuator that produces actuating force by the cooperation of magnetic circuit and drive coil, it is characterized in that: above-mentioned magnetic circuit, magnetically adsorb by a plurality of permanent magnet pieces that on the inner peripheral surface of yoke parts cylindraceous, make section configuration with partial arc shape, and above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces also magnetically adsorbs and constitutes.
And, loud speaker of the present invention is the loud speaker that makes the oscillating plate driving that combines with voice coil loudspeaker voice coil by the cooperation of magnetic circuit and voice coil loudspeaker voice coil, it is characterized in that: above-mentioned magnetic circuit, magnetically adsorb by a plurality of permanent magnet pieces that on the inner peripheral surface of yoke parts cylindraceous, make section configuration with partial arc shape, and above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces also magnetically adsorbs and constitutes.
The present invention has following effect.
According to magnetic circuit of the present invention, because above-mentioned C type permanent magnet pieces is packed into, rather than the permanent magnet cylindraceous of packing into, making permanent magnet cylindraceous so can eliminate, difficulty on the rare-earth sintered magnet particularly cylindraceous, and, by using this magnetic circuit, can realize low cost and high performance actuator or loud speaker.Have again, each C type permanent magnet pieces is magnetically adsorbed at the inner peripheral surface and the reflex part of yoke parts, do not firmly fix, can provide ability the magnetic circuit of vibration such as to fall at low cost so can not use bonding agent.
On the other hand,, can pack into simply on the yoke parts, can make high-performance and small-sized magnetic circuit in excellent in efficiency ground being divided into a plurality of C type permanent magnet pieces according to the manufacture method and the manufacturing installation of magnetic circuit of the present invention.And, because above-mentioned C type permanent magnet pieces is packed into, rather than the permanent magnet cylindraceous of packing into, making permanent magnet cylindraceous so can eliminate, the difficulty on the rare-earth sintered magnet particularly cylindraceous can low cost and high production rate ground manufacturing magnetic circuit.
Description of drawings
Fig. 1 (a) is that expression is suitable for magnetic circuit of the present invention, and its approximate three-dimensional map of an example of actuator of packing into, (b) is its general profile chart.
Fig. 2 is the approximate three-dimensional map of the magnetized situation of expression C type permanent magnet pieces.
Fig. 3 is the approximate three-dimensional map that explanation is suitable for the summary of manufacturing installation of the present invention and manufacture method.
Fig. 4 is expression according to the figure to the insertion operation of yoke parts of the C type permanent magnet pieces of manufacturing installation of the present invention and manufacture method, (a) be the approximate three-dimensional map to the supply condition of center bar of expression C type permanent magnet pieces, (b) be the approximate three-dimensional map to the adsorbed state of center bar of expression C type permanent magnet pieces, (c) being the approximate three-dimensional map to the insertion state of yoke parts of expression center bar, (d) is the approximate three-dimensional map to the installment state of yoke parts of the drawing of expression center bar and C type permanent magnet pieces.
Fig. 5 is the figure to the fitting operation of yoke parts that represents C type permanent magnet pieces in detail, (a) be the general profile chart to configuration state of the inner peripheral surface of expression C type permanent magnet pieces and yoke parts, (b) being the general profile chart of the drawing operation of expression center bar, (c) is the general profile chart to the adsorbed state of yoke parts of expression C type permanent magnet pieces.
Fig. 6 is the figure of an example that center bar that expression will possess non magnetic supporting tool disposes 4 groups manufacturing installation, (a) being the approximate three-dimensional map to the installment state of center bar of expression C type permanent magnet pieces, (b) is the approximate three-dimensional map to the installment state of yoke parts 4 of expression C type permanent magnet pieces 1.
Fig. 7 is the figure of expression variation of the present invention, (a) be the general profile chart of expression to the situation of the magnet insertion of the yoke parts that the portion of returning is arranged, the general profile chart of the situation that (b) to be expression insert to the magnet of yoke parts outer peripheral face, the general profile chart of the situation that (c) to be expression insert to the magnet of the yoke parts with the recess that is used to accommodate bonding agent.
Fig. 8 is illustrated in the approximate three-dimensional map of anchor clamps C type permanent magnet certainly in the device example of the occasion of center bar location that be magnetized.
Fig. 9 is illustrated in the device that Fig. 8 represents, the figure of the tab order of C type permanent magnet, (a) be the general principal view of the positioning action of first C type permanent magnet of expression, (b) being the general principal view of the rotating operation of expression center bar, (c) is the general principal view of the positioning action of second C type permanent magnet of expression.
Figure 10 is pack into the general profile chart of an example of loud speaker of magnetic circuit of the present invention of expression.
Figure 11 is the performance plot of the relation of the amount of movement of expression magnetic circuit of the present invention and existing magnetic circuit and thrust.
Among the figure:
1-C type permanent magnet pieces; 2-center bar; 2a-projection; 3-non magnetic supporting tool; 4-yoke parts; 4a-inner peripheral surface; The 4b reflex part; 4c-return portion; 4d-outer peripheral face; 4e-recess; 5-drive coil; 6-vibrating elements; 7-delivery tray; 8-magnetization anchor clamps; 9-magnet location contraposition guide part; 9a-opening portion; 11 1 magnetic circuit portions; 12-yoke parts; 12a-urceolus portion; 12b-bottom surface sections; The 12c-inner cylinder portion; 13-permanent magnet pieces; 14-voice coil loudspeaker voice coil; 15-speech coil framework; 16-oscillating plate; 17-baffle plate; 18-framework; 19-dust cap.
Embodiment
Below, describe in detail to be suitable for magnetic circuit of the present invention and manufacture method thereof, manufacturing installation, pack into the in addition actuator of magnetic circuit of the present invention or the execution mode of loud speaker with reference to accompanying drawing.
At first, be the permanent magnet of packing at the yoke parts of magnetic circuit, do not use magnet cylindraceous in the present invention, and be to use to have it is divided into a plurality of shapes, i.e. the permanent magnet pieces of the section configuration of partial arc shape (C type permanent magnet pieces).
Above-mentioned C type permanent magnet pieces, orientation direction also can be parallel with Width (with the section of the above-mentioned partial arc shape direction of quadrature roughly), also can be thickness direction, but for example make the magnetic flux convergence, preferably to the thickness direction orientation for the coil ground of the central part that helps to be configured in actuator.In addition, stating orientation direction in the use is the occasion of the C type permanent magnet pieces of Width, makes preferably that above-mentioned to cut apart quantity more.
And above-mentioned C type permanent magnet pieces for for example miniaturization etc. of actuator of correspondence, can make the following thin-walled shape of thickness 2mm.If rare-earth sintered magnet cylindraceous is made relatively difficulty of the following cylinder magnet of thickness 2mm, if but above-mentioned C type permanent magnet pieces, even also make below the thickness 2mm than being easier to.Have again, also can utilize processing machine to make C type permanent magnet pieces from the cuboid piece.
The material of above-mentioned C type permanent magnet pieces, so long as it is just passable to play the iron acting material of permanent magnetism, but if consider the high performance of actuator for example or loud speaker, then rare-earth sintered magnet is the most suitable.Rare-earth sintered magnet with rare earth element, transitional metallic element and boron as main component.Magnet is formed according to any selections such as desired performances just passable.For example, (R is one or more of rare earth element to use R-T-B.T is to be one or both of necessary transitional metallic element with Fe or Fe and Co.B is a boron) occasion of based rare earth sintered magnet, in order to obtain the rare-earth sintered magnet of excellent in magnetic characteristics, preferably make in the magnet composition behind sintering, rare earth element R is that 20～40 quality %, boron are that 0.5～4.5 quality %, remaining part are formed for the cooperation of transitional metallic element T.Here, R is a rare earth element, i.e. one or more that select from Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu.Wherein especially with abundant and less expensive on the Nd resource, so preferably main component is made Nd.And containing of Dy increases anisotropy field, so effective on raising coercive force Hcj.Have again, can add that also adding element M makes R-T-B-M based rare earth sintered magnet.At this moment, Al, Cr, Mn, Mg, Si, Cu, C, Nb, Sn, W, V, Zr, Ti, Mo, Bi, Ga etc. can be exemplified, these one or more interpolations can be selected as adding element M.
Make above-mentioned C type permanent magnet pieces by rare-earth sintered magnet, for example be that raw material alloy powders such as magnetic powder are with the compression molding in magnetic field of above-mentioned C type shape with Nd-Fe-B.When above-mentioned compression molding, be shaped just passable on one side for example on one side add directional magnetic field at the thickness direction of formed body.And, also can utilize special dies to make roughly radial directed.By the formed body that obtains being heat-treated (sintering and timeliness are handled), make C type permanent magnet pieces (rare-earth sintered magnet).In the making of C type permanent magnet pieces, even rare-earth sintered magnet, the distortion during sintering or the generation of crackle, breach etc. are also seldom.
Above-mentioned C type permanent magnet pieces can be that magnet cylindraceous is divided into the shape of cutting apart quantity arbitrarily, for example makes roughly 90 ° occasion in the curvature with periphery (partial arc), thereby becomes its 4 of combination roughly cylindric.
Fig. 1 (a) and (b) are the figure of an example that are illustrated in the magnetic circuit of above-mentioned 4 permanent magnet pieces 1 of packing on the yoke parts 4 cylindraceous and use its actuator.As mentioned above, in magnetic circuit,, constitute permanent magnet roughly cylindraceous by 4 permanent magnet pieces 1 of packing into.And which all is the magnetization of inner peripheral surface homopolarity ground for these 4 permanent magnets 1, is constituting the roughly occasion of permanent magnet cylindraceous as mentioned above, and inner peripheral surface all is homopolarity (for example N utmost point), and outer peripheral face all is antipole (for example S utmost point).And, for example, possess the vibrating elements 6 of drive coil 5 by the inboard configuration at the permanent magnet pieces 1 of the cylindric combination of above-mentioned magnetic circuit, the cooperation of this vibrating elements 6 by above-mentioned permanent magnet pieces 1 and drive coil 5 above-below direction in the drawings vibrated, and constitutes as actuator.In this actuator, be controlled at the electric current that drive coil 5 flows by control device (diagram is omitted), control its driving.
, on above-mentioned yoke parts 4 cylindraceous, shown in Fig. 1 (b), be formed with the distolateral reflex part 4b that shows the right angle warpage greatly of one here, become the form of the bottom surface of supporting permanent magnet pieces 1 by this reflex part 4b.Therefore, each permanent magnet pieces 1 also magnetically adsorbs at above-mentioned reflex part 4a when the inner peripheral surface 4a of yoke parts 4 magnetically adsorbs.
In magnetic circuit of the present invention, as mentioned above, each permanent magnet pieces 1 also magnetically adsorbs importantly when the inner peripheral surface 4a of yoke parts 4 magnetically adsorbs at above-mentioned reflex part 4b, can not use bonding agent thus and realize firm fixing.In fact, as shown in Figures 1 and 2, about the occasion (embodiment) that each permanent magnet pieces 1 is magnetically adsorbed at the inner peripheral surface 4a and the reflex part 4b of yoke parts 4, above-mentioned reflex part 4b is not set makes 1 occasion (comparative example) of magnetically adsorbing of each permanent magnet pieces, carry out the stationary state that fall-down test attempts investigating permanent magnet pieces 1 at the inner peripheral surface 4a of yoke parts 4.The result represents with table 1.In addition, fall-down test highly makes actuator fall from each, and whether observation is moved with the fixing permanent magnet pieces 1 of magnetic force and carried out.Measurement carries out 10 samples, calculated the number of the sample that permanent magnet pieces 1 moves.
Table 1
| Highly | |||
| 30cm | 100cm | 150cm | |
| Embodiment | 0/10 | 1/10 | 3/10 |
| Comparative example | 8/10 | 10/10 | 10/10 |
As known from Table 1, in the occasion (embodiment) that the inner peripheral surface 4a and the reflex part 4b that make each permanent magnet pieces 1 at yoke parts 4 magnetically adsorb, permanent magnet pieces 1 moves hardly.Relative therewith, make 1 occasion (comparative example) of magnetically adsorbing of each permanent magnet pieces at the inner peripheral surface 4a of yoke parts 4, in the occasion that any height falls, almost all the permanent magnet pieces 1 of sample all moves.
As mentioned above, in magnetic circuit of the present invention, can be only obtain sufficient constant intensity, can not use bonding agent and realize the raising of productivity ratio and make cheaply by set according to the magnetic force of yoke parts 4 and permanent magnet pieces 1.And, and do not use bonding agent irrelevant, can do in pairs owing to the state that the vibration that produces is also fully born such as falling, also out of question aspect reliability.
As mentioned above, in the occasion of a plurality of permanent magnet pieces 1 formation magnetic circuits of packing into, preferably the interval between each permanent magnet pieces 1 is noted.Particularly, it is desirable to the interval between each permanent magnet pieces 1 is made 0.05mm～0.5mm, better is to make 0.1mm～0.3mm.Do not pack into by making above-mentioned interval, can making between the permanent magnet pieces 1 with colliding.And, if make above-mentioned interval, magnetic force is reduced significantly with ringshaped magnet (radial directed magnet etc.).Have again,, also can be when falling etc. absorb dropping shock by making above-mentioned interval.Permanent magnet pieces 1 anchors on the yoke parts 4 by magnetic force, so even there is strong impact also to make magnetic force become frictional force, can carry out the change of above-mentioned amount of space and the impact absorption simulated.
Make the magnetic circuit of said structure, at first, the C type permanent magnet pieces of making is magnetized.The magnetization of C type permanent magnet pieces, for example shown in Figure 2, many C type permanent magnet pieces 1 that superpose once magnetize processing.The direction of magnetization is any, but if consider high performance, then preferably makes the magnetization of thickness direction.Will be with the C type permanent magnet pieces 1 of above-mentioned stack to the thickness direction magnetization, it is just passable that the direction of magnetizing field H is made among the figure above-below direction.
Magnetized C type permanent magnet pieces 1, the yoke of packing into parts make magnetic circuit, in the occasion as above-mentioned C type permanent magnet pieces 1, need a plurality of C type permanent magnet pieces 1 of combination make cylindric.At this moment, so because single C type permanent magnet pieces 1 operability of packing into is bad, the effective making of magnetic circuit is difficulty relatively.
Therefore, in the present invention, use manufacturing installation for example shown in Figure 3, the C type permanent magnet pieces 1 that needs quantity is packed on the yoke parts in the lump.
Manufacturing installation shown in Figure 3 is by non magnetic supporting tool 3 formations of the center bar 2 that magnetically adsorbs above-mentioned C type permanent magnet pieces 1 at side face and configuration outside it.Above-mentioned center bar 2 need magnetically adsorb above-mentioned C type permanent magnet pieces 1, so need be formed by magnetic material.And its diameter need make the roughly decision as one man of curvature of the inner peripheral surface of the curvature of outer peripheral face and above-mentioned C type permanent magnet pieces 1.
On the other hand, above-mentioned non magnetic supporting tool 3 becomes ring-type (cylindric), disposes coaxially at side face and this center bar 2 of above-mentioned center bar 2.That is, be arranged to make above-mentioned center bar 2 to insert peristome, non magnetic supporting tool 3 covers the form of the outer peripheral face of center bar 2.And center bar 2 and non magnetic supporting tool 3 can relatively move, and therefore, center bar 2 becomes non magnetic relatively supporting tool 3 and inserts the state that dismounting is inserted freely.This non magnetic supporting tool 3 with the end face collision of above-mentioned C type permanent magnet pieces 1, when the drawing of center bar 2 described later, is finished the task to its restriction site, and above-mentioned C type permanent magnet pieces 1 is magnetically formed by nonmagnetic substance with adsorbing.In addition, using the very high flat thin magnet of magnetic force to be used as the occasion of above-mentioned permanent magnet pieces 1, need big power to the absorption affinity height of center bar 2 and the drawing of center bar 2.In this occasion, also can nonmagnetic material be set in addition, thereby adjust absorption affinity constituting the magnetic material of center bar 2 and being adsorbed between the permanent magnet pieces 1 of side face to separate by above-mentioned nonmagnetic material on the surface of center bar 2.
Above-mentioned manufacturing installation has the extremely simply structure that possesses above-mentioned center bar 2 and non magnetic supporting tool 3 basically, by using it, can once fix a plurality of C type permanent magnet pieces 1 at the inner peripheral surface 4a of for example yoke parts 4 cylindraceous.Below, illustrate that with reference to Fig. 4 the magnet that uses above-mentioned manufacturing installation inserts operation.
C type permanent magnet pieces 1 to be inserted at yoke parts 4, fixing, at first, shown in Fig. 4 (a), C type permanent magnet pieces 1 is magnetically adsorbed at the side face of center bar 2.For example, the curvature of partial arc is being made occasion roughly cylindraceous for 90 ° C type permanent magnet pieces 14 of combinations roughly, at the side face of center bar 2, supply with C type permanent magnet pieces 1 respectively from 4 directions, make it utilize magnetic force magnetically absorption on center bar 2 of C type permanent magnet pieces 1.At this moment, each C type permanent magnet pieces 1, for example the state with stack is positioned charging tray etc., just can to the side face supply of center bar 2 by releasing one by one.
Fig. 4 (b) is the figure of state that is illustrated in 4 C type permanent magnet pieces 1 of side face absorption of center bar 2.For example in C type the permanent magnet pieces 1 directed and magnetized occasion at thickness direction respectively, all the inner peripheral surface of C type permanent magnet pieces 1 becomes homopolarity, in occasion with above-mentioned cylindric combination, it is opposed to become homopolarity, if the side face at the center bar 2 that is formed by magnetic material magnetically adsorbs, then can not make between the C type permanent magnet pieces 1 mutually exclusive.In addition, be that example is illustrated here, but be not limited to this, the yoke parts 4 of for example also the center bar 2 of the permanent magnet pieces 1 usefulness square of square can being packed into the occasion of utilizing columned center bar 2 to pack into circular-arc C type permanent magnet pieces 1.
After the side face of above-mentioned center bar 2 makes 1 absorption of 4 C type permanent magnet pieces, shown in Fig. 4 (c), center bar 2 is inserted in the yoke parts 4 cylindraceous, make C type permanent magnet pieces 1 opposed with the inner peripheral surface 4a of yoke parts 4.And, do not make each C type permanent magnet pieces 1 be moved upward the ground restriction site by non magnetic supporting tool 3, drawing center bar 2 under this state shown in Fig. 4 (d), makes the C type permanent magnet pieces 1 of the inner peripheral surface that is adsorbed on center bar 2 fixing in the inner peripheral surface absorption of yoke parts 4.
Fig. 5 is the figure that is illustrated in the represented operation of above-mentioned Fig. 4 (c) and Fig. 4 (d) more in detail.Fig. 5 (a) is the figure that the state in the yoke parts 4 is inserted center bar 2 in expression.Under this state, be adsorbed on the C type permanent magnet pieces 1 of the side face of center bar 2, opposed with the inner peripheral surface of yoke parts 4, between C type permanent magnet pieces 1 and yoke parts 4, the magnetic attraction effect is arranged also, the magnetic attraction that act on this time between C type permanent magnet pieces 1 and center bar 2 is big, and each C type permanent magnet pieces 1 maintenance is adsorbed on the state of the side face of center bar 2.
Then, shown in Fig. 5 (b), do not make each C type permanent magnet pieces 1 be moved upward the ground restriction site, center bar 2 is risen by non magnetic supporting tool 3.The non magnetic relatively supporting tool 3 of center bar 2 inserts dismounting freely, can under the state of fixing non magnetic supporting tool 3 center bar 2 is moved upward, and carries out drawing.At this moment, the upper end butt of non magnetic supporting tool 3 and each C type permanent magnet pieces 1 prevents to follow the rising of above-mentioned center bar 2 that these C type permanent magnet pieces 1 are risen.
The drawing center bar 2 as mentioned above, then become from the form of drawing center bar 2 between the C type permanent magnet pieces 1 of cylindric combination, and the magnetic attraction of effect sharply reduces between C type permanent magnet pieces 1 and center bar 2.If center bar 2 from drawing fully between the above-mentioned C type permanent magnet pieces 1, is then become the state of the magnetic attraction elimination of effect between center bar 2 and C type permanent magnet pieces 1.So, C type permanent magnet pieces 1, by and above-mentioned yoke parts 4 between effect magnetic attraction and furthered by inner peripheral surface 4a in yoke parts 4, shown in Fig. 5 (c), magnetically adsorb fixing at the inner peripheral surface 4a of yoke parts 4.Do the set state to above-mentioned inner peripheral surface 4a of C type permanent magnet pieces 1 more powerful occasion in hope, also can and with for example according to bonding agent etc. carried out fixing.
In addition, inserting the occasion of fixing 4 C type permanent magnet pieces 1 to above-mentioned yoke parts 4, at the C type permanent magnet pieces 1 of the inner peripheral surface 4a of yoke parts 4 configuration, preferably it is set at about 0.1～0.5mm at interval.If above-mentioned interval too small then on the dimensional accuracy of C type permanent magnet pieces 1, is once inserted 4 and might be compared difficulty.On the contrary, if above-mentioned interval is excessive, then magnetic characteristic (magnetic flux that helps coil) reduces, and for example in the occasion that is used for actuator thrust is reduced.And, also magnetically adsorb ground for making each the C type permanent magnet pieces 1 and the reflex part 4b of yoke parts, be preferably in a side that forms above-mentioned reflex part 4b C type permanent magnet pieces 1 is set.Thus, can realize as previously described set intensity fully.
As more than, the center bar 2 that possesses non magnetic supporting tool 3 by use carries out C type permanent magnet pieces 1 to be fixed to the insertion of yoke parts 4, can be continuously and carry out in short time numerous and diverse magnet to the yoke parts is inserted.And operation at this moment is also easy, can productivity ratio make actuator well.For example,, and be provided with and same mechanism such as button ball pen, then can carry out above-mentioned magnet and insert with once promoting operation if with the spring force reinforcing of above-mentioned center bar 2 or non magnetic supporting tool 3 by helical spring etc.Have, each C type permanent magnet pieces 1 is once magnetization in advance again, so magnetize after the yoke parts 4 of need not packing into, also can improve productivity ratio in this.
In said apparatus, center bar 2 arrangements that for example will possess non magnetic supporting tool 3 are a plurality of, and a plurality of relatively yoke parts 4 carry out magnet simultaneously and insert, and can realize better efficient activity thus.Fig. 6 is 4 groups of center bar 4 configurations that expression will possess non magnetic supporting tool 3, and relative 4 yoke parts 4 carry out the figure of an example of the manufacturing installation of the structure that magnet inserts simultaneously.Yoke parts 4 are positioned to form according to the shape of these yoke parts 4 delivery tray 7 of circular recess, carry out inserting according to the magnet of aforesaid operations.The installment state to center bar 2 of Fig. 6 (a) expression C type permanent magnet pieces 1, the installment state to yoke parts 4 of Fig. 6 (b) expression C type permanent magnet pieces 1.
In addition, in this routine occasion, the fore-end 2a of center bar 2 as the guide part when the yoke parts insert, can be determined the position exactly with center bar 2 relative yoke parts 4.Carry out the occasion that magnet inserts simultaneously at a plurality of relatively yoke parts 4, need the positional precision of the relative yoke parts 4 of each center bar 2, by with said front part 2a as the guide part utilization, can carry out exactly inserting to the magnet of yoke parts 4.
In the manufacturing installation of structure shown in Figure 6, by 4 yoke parts 4 are carried out magnet is once inserted, and be positioned yoke parts 4 on the delivery tray 7 and supply with successively, can handle continuously, realize significantly efficient activity.
By being suitable for manufacture method of the present invention, manufacturing installation, can make high-performance and small-sized magnetic circuit in excellent in efficiency ground with being divided into a plurality of C type permanent magnet pieces 1 yoke parts 4 of packing into simply.And do not pack into permanent magnet cylindraceous but the above-mentioned C type permanent magnet pieces 1 of packing into are being made permanent magnet cylindraceous so can eliminate, the difficulty on the rare-earth sintered magnet particularly cylindraceous, can low cost and high production rate ground make magnetic circuit.
In addition, magnetic circuit of the present invention, manufacture method, and manufacturing installation be not limited to above-mentioned example, for example according to the shape of yoke parts 4 etc., can carry out various changes.Below, magnetic circuit of the present invention, manufacture method, and the variation of manufacturing installation are described.
Fig. 7 (a) forms the occasion of returning the 4c of portion with the inner-diameter portion whose at yoke parts 4 with the form that reflex part 4b is further turned back squarely.At the yoke parts 4 of this relatively shape, install and fix the occasion of C type permanent magnet pieces 1, the above-mentioned 4c of portion that returns becomes obstruction usually, and the insertion of C type permanent magnet pieces 1 becomes extremely difficult.
In this occasion, utilize manufacture method of the present invention, then can be simply and positively carry out magnet and insert.But, in this occasion, shown in Fig. 7 (a), center bar 2 need be made hollow tubular, make and in center bar 2, insert the above-mentioned form of returning the 4c of portion.In above-mentioned center bar 2, insert the above-mentioned form of returning the 4c of portion if make, then can carry out the determining positions of the center bar 2 of relative yoke parts 4 simultaneously, can carry out magnet exactly and insert.And except above-mentioned center bar 2 is made the hollow tubular, other can be used and before Fig. 3 and even same apparatus structure, the method for operation of execution mode shown in Figure 5, and yoke parts 4 are installed C type permanent magnet pieces 1 relatively.
Fig. 7 (b) is the example that C type permanent magnet pieces 1 is installed at the outer peripheral face 4d of yoke parts 4.At the relative outer peripheral face 4d of yoke parts 4 occasion of C type permanent magnet pieces 1 is installed, center bar 2 and non magnetic supporting tool 3 is made cylindric, dispose non magnetic supporting tool 3 in the inner peripheral surface side of center bar 2.And, when inserting magnet, C type permanent magnet pieces 1 is magnetically adsorbed at the inner peripheral surface of center bar 2.C type permanent magnet pieces 1 is magnetically adsorbed, utilize, carry out with just passable in the same operation of the inner peripheral surface location of yoke parts cylindraceous C type permanent magnet pieces 1 for example at Fig. 3 or center bar or non magnetic supporting tool shown in Figure 4.Other methods of operation etc. and Fig. 3 and even execution mode shown in Figure 5 are same.
Fig. 7 (c) is the distortion about the shape of yoke parts 4, and the method for operation of inserting about the structure of center bar 2 or non magnetic supporting tool 3, magnet etc. are same with Fig. 3 and even execution mode shown in Figure 5.In this routine occasion, be formed with the recess 4e that accommodates bonding agent in the periphery bottom of yoke parts 4.If in this recess 4e, fill bonding agent, then C type permanent magnet pieces 1 the inner peripheral surface 4a of yoke parts 4 magnetically adsorb fixing in, also will be by the adhesive securement among the above-mentioned recess 4e.
And, the structure of the yoke parts 4 that this is routine, in the yoke parts that form at magnetic metal such as crooked iron, also favourable on the installation site precision that improves C type permanent magnet pieces 1.In the occasion of bending machining magnetic holding plate,,, have to be configured in than the position of bottom surface by some tops in the occasion that installs and fixes above-mentioned C type permanent magnet pieces 1 in any case the bight also becomes some R shapes.By above-mentioned recess 4e is set, above-mentioned R shape is partly retreated, C type permanent magnet pieces 1 can positively contact with reflex part 4b with the inner peripheral surface 4a of yoke parts simultaneously.By doing like this, C type permanent magnet pieces 1 magnetically and securely can be anchored on the yoke parts 4.And, in Fig. 7 (c), recess 4e is located at the bottom of yoke parts 4, but also can be located at all sides.
In manufacture method of the present invention, manufacturing installation, for example C type permanent magnet pieces 1 also can change to supply method of center bar 2 etc.In execution mode before, 4 sides configuration charging tray at center bar 2, from supplying with 4 C type permanent magnet pieces 1 to the side face of center bar 2 here, because magnetic attraction is adsorbed on the center bar 2 more tightly, so might produce between the C type permanent magnet pieces 1 undesirable condition such as collsion damage.And, C type permanent magnet pieces 1, with damaged or pollute prevent to be purpose, many with the situation that is housed in the state keeping in indivedual holes, it located on charging tray and snug more numerous and diverse.
In order to eliminate these undesirable conditions, for example shown in Figure 8, magnet location contraposition guide part 9 is installed on center bar 2, in the opening portion 9a that is arranged at this magnet location contraposition guide part 9, is inserted C type permanent magnet pieces 1, also can in the side face location of center bar 2 one by one.
Illustrate in further detail about above-mentioned localization method, at first, magnet location contraposition guiding 9 is installed on each center bar 2.At this moment, the direction that is provided with of center bar 2 is not a above-below direction as before execution mode, but horizontal direction, is positioned yoke parts 4 on the delivery tray 7 towards horizontal direction yet.
C type permanent magnet pieces 1 is housed in the magnetization anchor clamps 8 with the indivedual hole 8a that form as the recess of stipulating, it is taken out one by one, is positioned on the side face of above-mentioned center bar 2.The taking-up from indivedual hole 8a of C type permanent magnet pieces 1 for example can use the taking-up anchor clamps of metal contact etc. being installed at front end to carry out simply.By taking out the C type permanent magnet pieces 1 that anchor clamps take out, utilize above-mentioned magnet location contraposition guiding 9, by above-mentioned opening portion 9a contraposition on one side at the side face of center bar 2 magnetically adsorb on one side.
Fig. 9 is the erection sequence of a series of C type permanent magnet pieces 1 of expression.C type permanent magnet pieces 1 to be installed in the side face of center bar 2, shown in Fig. 9 (a), utilize the opening portion 9a of above-mentioned magnet location contraposition guiding 9, first C type permanent magnet pieces 1 is absorbed and fixed on the assigned position of side face of center bar 2.At this moment, if in the side face setting of center bar 2 for example as the protruding 2b on the border of 4 C type permanent magnet pieces 1 etc., then C type permanent magnet pieces 1 can be installed under the state that determines the position more accurately.
After above-mentioned first C type permanent magnet pieces 1 is installed, center bar 2 to counterclockwise rotating, shown in Fig. 9 (b), is moved above-mentioned first C type permanent magnet pieces 1 of above-mentioned installation.At this moment rotational angle, the combination 4 C type permanent magnet pieces 1 occasion the chances are 90 °.And rotation direction also can be above-mentioned counter clockwise direction, also can be clockwise direction.
Then, shown in Fig. 9 (c), utilize the opening portion 9a of above-mentioned magnet location contraposition guide part 9, second C type permanent magnet pieces 1 is absorbed and fixed on the assigned position of side face of center bar 2.By it is repeated 4 times, finish the installation to center bar 2 of 4 C type permanent magnet pieces 1.Insert with the occasion of before execution mode same to the magnet of yoke parts 4.But,, carry out the insertion and the drawing of horizontal direction in the occasion of present embodiment.
According to present embodiment, do not need C type permanent magnet pieces 1 directly to be supplied with to center bar 2 from magnetization anchor clamps 8 from magnetizing anchor clamps 8 to the location of the C of charging tray type permanent magnet pieces.And, C type permanent magnet pieces 1 is installed on the center bar 2 one by one, so can avoid because the damage of the collision between the C type permanent magnet pieces 1 etc.
More than, suitable magnetic circuit of the present invention and manufacture method, manufacturing installation have been described, the actuator of the magnetic circuit of the present invention of packing in addition, but above-mentioned magnetic circuit not only is used in actuator, for example can also use as the magnetic circuit of loud speaker.
Figure 10 is the figure of an example of the expression loud speaker that uses magnetic circuit of the present invention.Magnetic circuit portion 11 has the structure same with above-mentioned magnetic circuit basically, by the inwall at yoke parts 12 cylindraceous many permanent magnet pieces 13 is magnetically adsorbed and constitutes.Here, the permanent magnet pieces 1 of packing into all is the permanent magnet pieces 1 of the magnetized C type in inner peripheral surface homopolarity ground, and in the occasion with cylindric combination, homopolarity is adsorbed on the inwall of yoke parts 12 opposed to each other.And, yoke parts 12 cylindraceous by this urceolus 12a of portion cylindraceous, the bottom surface sections 12b that turns back with the right angle in the bottom, also have and to erect the inner cylinder portion 12c that forms from bottom surface sections 12b with the right angle and constitute, above-mentioned permanent magnet pieces 13 and inner cylinder portion 12c are opposed and magnetic gap that formation has specified gap.
In the loud speaker of present embodiment, on above-mentioned magnetic gap, insert the speech coil framework 15 of coiling voice coil loudspeaker voice coil 14, the cooperation by voice coil loudspeaker voice coil 14 and above-mentioned magnetic circuit (permanent magnet pieces 13) above-below direction in the drawings constitutes drivingly.
Above-mentioned speech coil framework 15 combines with oscillating plate 16, follows the driving of speech coil framework 15 and vibrates.Speech coil framework 15 combines with the center of oscillating plate 16, and combines with framework 18 by baffle plate 17.
Oscillating plate 16 is so-called conical oscillating plate in this routine occasion, and its outer peripheral portion combines with framework 18.At the core of oscillating plate 16, do not make dust enter magnetic circuit portion 11 or speech coil framework 15 ground, dust cap 19 is installed.In addition, oscillating plate 16 is not limited to pyramid type, can adopt any oscillating plate.Particularly, also can be flat oscillating plate of having honeycombed structure etc.And the material of oscillating plate 16 is also any, and except conical paper, plastics or carbon fiber also have compound these material etc., and well-known oscillating plate material all can be suitable for.
In the loud speaker of present embodiment, dispose speech coil frameworks 15 with permanent magnet pieces 13 opposed forms with cylindric arrangement.Adopting the occasion of this magnetic circuit, if using ferrite magnet then a little less than the magnetic force and might can not get required stroke on the permanent magnet pieces 13.Therefore, on loud speaker, adopt the occasion of above-mentioned magnetic circuit, be preferably in permanent magnet pieces 13 and use rare-earth sintered magnet.
Figure 11 is the different figure of expression according to the thrust of the different speech coil framework of magnetic circuit.As present embodiment, with cylindric configuration permanent magnet pieces 13, and wall makes voice coil loudspeaker voice coil 14 opposed within it, also has the occasion of using rare-earth sintered magnets (NdFeB based magnet) at permanent magnet pieces 13, a represents as the figure center line, can obtain stable thrust on the amount of movement of amplitude broad.Relative therewith, in the occasion of the general magnetic circuit of the ferrite lattice that use to use ring-type, b represents as the figure center line, and the occasion little at amount of movement can obtain thrust, but mobile quantitative change greatly then thrust sharply reduce.In loud speaker, for example require to make stroke to become big for high pitch materialization, by adopting magnetic circuit of the present invention, can satisfy this requirement.
Claims (18)
1. magnetic circuit is characterized in that:
A plurality of permanent magnet pieces of the section configuration with partial arc shape magnetically are adsorbed, and,
Above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces also magnetically is adsorbed.
2. magnetic circuit according to claim 1 is characterized in that:
Between above-mentioned each permanent magnet pieces is 0.05mm～0.5mm at interval.
3. magnetic circuit according to claim 1 is characterized in that:
Between above-mentioned each permanent magnet pieces is 0.1mm～0.3mm at interval.
4. magnetic circuit according to claim 1 is characterized in that:
Above-mentioned permanent magnet pieces is formed by rare-earth sintered magnet.
5. the manufacture method of a magnetic circuit is characterized in that:
The permanent magnet pieces that will have the section configuration of partial arc shape magnetically adsorbs at the side face of the center bar that is formed by magnetic material, under this state, make yoke parts and above-mentioned permanent magnet pieces opposed after,
With above-mentioned permanent magnet pieces by the state of non magnetic supporting tool restriction site under the above-mentioned center bar of drawing, on above-mentioned yoke parts, above-mentioned permanent magnet pieces is magnetically adsorbed and fixes.
6. the manufacture method of magnetic circuit according to claim 5 is characterized in that:
Permanent magnet pieces is magnetically adsorbed and fix at the inner peripheral surface of yoke parts cylindraceous.
7. the manufacture method of magnetic circuit according to claim 6 is characterized in that:
Above-mentioned permanent magnet pieces is roughly become to dispose a plurality ofly at the side face of above-mentioned center bar cylindricly, once adsorb fixing at the inner peripheral surface of above-mentioned yoke parts cylindraceous these permanent magnet pieces.
8. the manufacture method of magnetic circuit according to claim 7 is characterized in that:
Above-mentioned a plurality of permanent magnet pieces is supplied with to above-mentioned center bar from the different direction of difference.
9. the manufacture method of magnetic circuit according to claim 7 is characterized in that:
Above-mentioned a plurality of permanent magnet pieces is supplied with to the side face of above-mentioned center bar from same direction, is adsorbed on successively by the center of rotation rod on the side face of center bar.
10. the manufacture method of magnetic circuit according to claim 5 is characterized in that:
Above-mentioned permanent magnet pieces magnetizes on thickness direction in advance.
11. the manufacturing installation of a magnetic circuit is characterized in that,
Possess: form by magnetic material, have the center bar that the permanent magnet pieces of the section configuration of partial arc shape magnetically is adsorbed on side face; With become ring-type, on the side face of above-mentioned center bar, set with this center bar is coaxial, the non magnetic supporting tool of the end face butt of the permanent magnet pieces that is adsorbed with side face at center bar,
The above-mentioned relatively non magnetic supporting tool of above-mentioned center bar inserts dismounting freely.
12. the manufacturing installation of magnetic circuit according to claim 11 is characterized in that:
Has magnet feed mechanism from permanent magnet pieces to the side face of above-mentioned center bar that supply with.
13. the manufacturing installation of magnetic circuit according to claim 12 is characterized in that:
The side face of above-mentioned magnet feed mechanism and above-mentioned center bar is opposed and be provided with a plurality of.
14. the manufacturing installation of magnetic circuit according to claim 11 is characterized in that:
The contraposition guide part that has with the shape corresponding opening portion of above-mentioned permanent magnet pieces is installed on the above-mentioned center bar.
15. an actuator, the cooperation generation actuating force by magnetic circuit and drive coil is characterized in that:
Constituting of above-mentioned magnetic circuit, a plurality of permanent magnet pieces of the section configuration with partial arc shape are magnetically adsorbed, and above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces is magnetically absorption also.
16. actuator according to claim 15 is characterized in that:
Above-mentioned permanent magnet pieces is formed by rare-earth sintered magnet.
17. a loud speaker, the oscillating plate that the cooperation by magnetic circuit and voice coil loudspeaker voice coil will combine with voice coil loudspeaker voice coil drives, and it is characterized in that:
Constituting of above-mentioned magnetic circuit, a plurality of permanent magnet pieces of the section configuration with partial arc shape are magnetically adsorbed, and above-mentioned yoke parts cylindraceous at one end side have and show the reflex part that the right angle turns back greatly, and the above-mentioned relatively reflex part of the end face of above-mentioned permanent magnet pieces is magnetically absorption also.
18. loud speaker according to claim 17 is characterized in that:
Above-mentioned permanent magnet pieces is formed by rare-earth sintered magnet.
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| CN106067714A (en) * | 2015-04-21 | 2016-11-02 | 普罗蒂恩电子有限公司 | For magnet is installed on the device of motor |
| CN109158209A (en) * | 2018-08-09 | 2019-01-08 | 中国原子能科学研究院 | The dry type permanent magnetism separation method of magnetic-particle in granulate mixture |
| CN109511077A (en) * | 2018-10-16 | 2019-03-22 | 深圳市韶音科技有限公司 | A kind of magnet assembling fixture of magnetic circuit system |
| CN111294712A (en) * | 2018-12-06 | 2020-06-16 | 现代自动车株式会社 | Yoke for a loudspeaker, method for manufacturing a yoke and loudspeaker device comprising a yoke |
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Family Cites Families (2)
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| CN1019283B (en) * | 1990-03-26 | 1992-12-02 | 青山好高 | Bar for spares feeding |
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| CN106067714A (en) * | 2015-04-21 | 2016-11-02 | 普罗蒂恩电子有限公司 | For magnet is installed on the device of motor |
| CN105048758A (en) * | 2015-05-26 | 2015-11-11 | 中国人民解放军63983部队 | Electromagnetic direct-drive type impact vibrator |
| CN105048758B (en) * | 2015-05-26 | 2017-10-03 | 中国人民解放军63983部队 | Electromagnetic direct-drive formula impact shock body |
| CN109158209A (en) * | 2018-08-09 | 2019-01-08 | 中国原子能科学研究院 | The dry type permanent magnetism separation method of magnetic-particle in granulate mixture |
| CN109158209B (en) * | 2018-08-09 | 2020-07-28 | 中国原子能科学研究院 | Dry permanent magnetic separation method for magnetic particles in particle mixture |
| CN109511077A (en) * | 2018-10-16 | 2019-03-22 | 深圳市韶音科技有限公司 | A kind of magnet assembling fixture of magnetic circuit system |
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| CN111586551A (en) * | 2020-04-21 | 2020-08-25 | 东莞市融贤实业有限公司 | Auxiliary magnetic adding device and method for loudspeaker |
| CN115086858A (en) * | 2022-08-18 | 2022-09-20 | 歌尔股份有限公司 | Method for manufacturing magnetic circuit assembly, magnetic circuit assembly and loudspeaker |
| CN115086858B (en) * | 2022-08-18 | 2022-11-01 | 歌尔股份有限公司 | Magnetic circuit assembly manufacturing method, magnetic circuit assembly and loudspeaker |
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