CN101934551B - Magnetic circuit structure of high-central-field magnetic shoe mould - Google Patents
Magnetic circuit structure of high-central-field magnetic shoe mould Download PDFInfo
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- CN101934551B CN101934551B CN2010102476264A CN201010247626A CN101934551B CN 101934551 B CN101934551 B CN 101934551B CN 2010102476264 A CN2010102476264 A CN 2010102476264A CN 201010247626 A CN201010247626 A CN 201010247626A CN 101934551 B CN101934551 B CN 101934551B
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Abstract
The invention relates to a magnetic circuit structure of a high-central-field magnetic shoe mould, which comprises an upper punch head and a lower punch head, wherein the upper punch head and the lower punch head are made of magnetic-conducting materials, a magnetic-conducting material layer is respectively embedded between the molding surfaces of the upper punch head and the lower punch head and a basal body to form a magnetic-flux refracting surface, and the shape of the magnetic non-conducting material embedded layer of the upper punch head is formed from a line segment L and a line segment L1 at both sides and a line segment B at the top end, wherein the line segment L and the line segment L1are straight line segments, the line segment B is an arc line segment or a straight line segment, an included angle alpha is 50-72 degrees, the embedded shape of the lower punch head is formed from an arc line at the top end, straight lines at both sides and an arc line at the bottom side, and an included angle beta=2(90 degrees-alpha)+0-11). In the invention, the upper punch head and the lower punch head, made of the magnetic-conducting materials, are respectively embedded into the magnetic non-conducting material layer with the finely designed shape to form the more effective magnetic-flux refracting surface, thereby realizing that magnetic particles are subjected to the action of a more ideal polymerization magnetic field to carry out more appropriate orientation when a blank body is molded, realizing the high central field and the high middle-position surface magnet of a magnetic shoe and generating an active contribution to effectively improving the mechanical characteristic of a motor.
Description
Technical field
The present invention relates to the magnetic structure of the used mould of a kind of permanent-magnet ferrite magnet wet method, dry-press process, especially a kind of magnetic structure that can obviously improve tile-shaped magnet central magnetic field intensity.
Background technology
" moulding " in the technological process of permanent-magnet ferrite wet method, dry production tile-shaped magnet is the shape of decision final finished and the basic operation of magnetic performance characteristic.Magnet will have bigger influence to the operation characteristic of micro machine to magnetic field intensity and the distribution characteristics that air gap provides in use.
In long-term and the cooperative process client; We find from client's feedback information; The mould of traditional magnetic structure as shown in Figure 6 is produced is contained in product in the motor case 5 to show in the intrados site surface magnetic usually close low, the low characteristic of central field (central field measurement point position W is by shown in Figure 6).The magnetic field orientating state that the different positions of magnet its base substrate when moulding are suffered be not both the key that causes this characteristic.Magnet is influenced by the orientation of the magnetic domain of magnet own to the Density Distribution of magnetic field in the space that space outerpace provided, this directionality be when moulding its ferrite particulate in addition the guiding of direction is directed and be compacted into base through the magnetic circuit in the mould structure under the effect of externally-applied magnetic field.Obviously, the influence that magnetic circuit magnetic field is applied the moulding particle during moulding will cause the difference of its flux gather density, thereby influence the performance of final products central field in use.
The traditional design structure is as shown in Figure 3.Its design feature has: 1) in most cases, do not inlay non-magnet_conductible material on the profile of upper punch, when inlaying non-magnet_conductible material under the rare occasion, inlay is shaped as arc, and is concentric with the profile arc, and its thickness is for radially all thick and how in 6 millimeters; 2) moulding of base substrate for the benefit of; In the magnetic circuit of bottom punch not the magnetic layer shaped design be the size of the size at a place less than the b place; So naturally just make the numerical value of r strengthen, shape is milder, the flux refraction that forms by upper and lower stamping like this look like among Fig. 3 shown in face.The entad gather density of magnetic flux on its plane of refraction is not high.As previously mentioned; The orientation influence relation in the performance of the magnetic characteristic that magnetic shoe is final and its suffered moulding magnetic field when moulding is bigger; Product by the mould of traditional approach design is produced is final because its magnetic circuit gathers the finiteness of magnetic degree; The Surface field intensity and the central field that make finished product show are not ideal, and intrados both sides table field intensity is obviously greater than middle bit table field intensity.After so Surface field distributed and makes that magnetic shoe is assembled into motor, operation characteristic such as the torque and the noise etc. of motor were not ideal.
Summary of the invention
The present invention is the magnetic structure that a kind of high central field magnetic shoe mould will be provided; Through optimal design to mould structure; Reach comparatively reasonably magnetic structure; Thereby let the magnetic shoe product under the prerequisite that does not change other production factors, inner arc uses face just can show meta Surface field intensity and the central magnetic field intensity higher than traditional product.
The technical scheme that the present invention adopts is: a kind of magnetic structure of high central field magnetic shoe mould; Comprise the upper and lower drift of processing by permeability magnetic material; It is characterized in that: be embedded with upper and lower magnetic conductive material layer on the die cavity of said upper and lower drift respectively, form effective flux refraction face, wherein:
(1) shape of the last non-magnet_conductible material layer of upper punch is by both sides L, L1 line segment; B top line segment is formed; Wherein L, L1 line segment are straightway, and the B line segment is arc or straightway, L; The angle of L1 line segment and profile is between 50～72 °, and last non-magnet_conductible material layer thickness H is 2～2.5 times of its limit base thickness degree h; Limit base thickness degree h is 4～10 millimeters;
(2) the following non-magnet_conductible material layer of low punch and the chimeric shape between the magnetic conductive material layer matrix are by the top camber line, and both sides straight line and base camber line are formed, the formed angle β of two straightways=2 (90 °-α)+0～11); Following non-magnet_conductible material layer both sides thickness h 1 is 8～15 millimeters; Inlay tip thickness c is 0,1.5～2 millimeters, and top camber line width f1 is the low punch width F of (0.32～0.35), and between both sides straight line and the camber line junction, base is the low punch width F of (0.56～0.6) apart from f2.
When the B line segment of upper punch was camber line, its radius was 1.4～1.5 times of die cavity mouth arc radius R '.
The top radius of curvature r of low punch is 0.51～0.6 times of its following non-magnet_conductible material layer upper end radius of curvature R; Base radius of curvature r ' is 1.58～1.63 times of top radius of curvature r.
Use the made magnet of magnetic structure of above-mentioned high central field magnetic shoe mould, the Surface field intensity of magnet intrados meta is 1.8～4.5 times of extrados meta Surface field intensity.
The invention has the beneficial effects as follows: the magnetic field of using the face both sides based on reduction magnetic shoe inner arc; Strengthen the thinking of bit table field and central magnetic field intensity in the magnetic shoe intrados, the present invention is through the magnetic structure to mould, mainly be the upper and lower stamping processed of permeability magnetic material be embedded with weak magnetic conductive material layer respectively; Form effective flux refraction face; Thereby when being implemented in blank forming, magnetic particle receives the effect in even more ideal polymerization magnetic field and makes appropriate orientation, thereby realizes the high central field of magnetic shoe; High middle bit table magnetic produces positive contribution to effective mechanical property of improving motor.Adopt the base substrate of producing under the magnetic field condition of mould installation of the present invention back; After oversintering and operation such as mill processing etc., become needed products, this product will show bit table field and central magnetic field in the intrados of the product of making apparently higher than traditional moulds, more suitable intrados magnetic flux distribution.
Description of drawings
Fig. 1 is the signal of upper punch magnetic structure,
Wherein: α is L, and the angle of L1 line segment and profile, H are non-magnet_conductible material inlay thickness, and h is a non-magnet_conductible material inlay limit base thickness degree, and R ' is a die cavity mouth arc radius;
Fig. 2 is the signal of bottom punch magnetic structure,
Wherein: β is the formed angles of two straightways, and h1 is non-magnet_conductible material inlay both sides thickness, and c is the inlay tip thickness; F1 is a top camber line width; F is the low punch width, and f2 is the distance between both sides straight line and the camber line junction, base, and R is a non-magnet_conductible material upper end radius of curvature; R is the top radius of curvature, and r ' is the base radius of curvature;
Fig. 3 is the upper and lower mould and the die cavity combination signal of traditional design;
Fig. 4 is upper and lower mould of the present invention and die cavity combination signal;
Fig. 5 is the signal of magnet surface magnetic field intensity measurement point position;
Fig. 6 is the signal of magnet center field measurement point position.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
As shown in Figure 4, the magnetic structure of high central field magnetic shoe mould of the present invention comprises the upper and lower drift of being processed by permeability magnetic material 1,3, is embedded with upper and lower magnetic conductive material layer 2,4 on the die cavity of upper and lower drift respectively, forms the flux refraction face.
As shown in Figure 1, the shape of the last non-magnet_conductible material layer 2 of upper punch is by both sides L, L1 line segment, and B top line segment is formed; Wherein L, L1 line segment are straightway, and the B line segment is arc or straightway, L; The angle of L1 line segment and profile is between 50～72 °, and H is 2～2.5 times of h; H is 4～10 millimeters.When the B line segment of upper punch was camber line, its radius was 1.4～1.5 times of R '.
As shown in Figure 2, the following non-magnet_conductible material layer 4 of low punch and the chimeric shape between the magnetic conductive material layer matrix are by the top camber line, and both sides straight line and base camber line are formed, β=2 (90 °-α)+0～11); H1 is 8～15 millimeters; C is 0,1.5～2 millimeters, and f1 is (0.32～0.35) F, and f2 is (0.56～0.6) F.R is 0.51～0.6 times of R; R ' is 1.58～1.63 times of r.
Use the made magnet of magnetic structure of above-mentioned high central field magnetic shoe mould, the Surface field intensity of magnet intrados meta is 1.8～4.5 times of extrados meta Surface field intensity.
According to the specification of finished product, confirm the relative dimensions of green compact according to traditional approach, thereby form mould magnetic Circuit Design according to the invention required basic size R ', R.
1. upper punch flux refraction face (line of S shown in Fig. 1) confirms
(1), confirms a h value (central angle of R ' segmental arc correspondence is big, and the h value is big, otherwise then little) according to the R ' that confirms;
(2) 4～10 millimeters of the spans of h;
(3) after h confirms, the value of getting 2～2.5 times of definite H of its value;
(4) can make line segment B after H confirms, B is camber line or straight line, if during camber line, the 1.4-1.5 that its radius value is got R ' doubly;
(5) angle of line segment L (L1) and profile confirms.The definite of α also decides according to the size variation of the corresponding central angle of R ' segmental arc.Greatly then α is big for corresponding central angle, otherwise then little.The span of α is between 50～72 °;
(6) but according to above-mentioned 3,4,5 step boning out section L (L1) and with line segment B commissure mutually, form the flux refraction face of the part of the upper punch magnetic circuit shown in the S line among Fig. 1.
2. bottom punch flux refraction face (the M line shown in Fig. 2) confirms
(1) according to the R that confirms, confirm a r value, the value of r is got 0.51～0.6 times of R;
(2) the c value confirms.The c value is got 1.5～2 millimeters;
(3) f1's confirms.F is the value of confirming in green compact when design, and f1 gets (0.32～0.35) times of F value;
(4) f2's confirms.F2 gets F value (0.56～0.6) doubly;
(5) the angle β's of straightway shown in Figure 2 confirms.β=2 (90 °-α)+t (span of t: 0～11);
(6) h1's confirms.H1 generally gets 8～15 millimeters;
(7) r ' value confirms.R ' gets 1.58～1.63 times of r;
(8) can confirm to form the bottom punch flux refraction face shown in M line among Fig. 2 according to above step 1,2,3,4,5,6,7 determined size positions.
When if the c value gets zero, then f1 upwards intersects along moving in R, and the r of this line segment scope is replaced by R, and the design of other line segments is equally according to according to the invention carrying out.
3. the upper and lower stamping of the above flux refraction face of confirming (like Fig. 1, shown in Figure 2) is processed applicable mold component through suitable processing method, walk abreast into the new mould magnetic structure that upper and lower stamping as shown in Figure 4 and die cavity are combined into.Here the non-magnet_conductible material that is used for hybrid layer is selected the austenitic metal alloy material for use, and material commonly used has 0Cr18Ni9,1Cr18Ni9Ti stainless steel and manganese steel etc.
Adopt this new construction mould to use the same raw material used when producing in the past; In same condition of molding (pressure, time, magnetizing field strength, speed etc.); Sintering condition; The product of producing under the mill processing conditions, its intrados center Surface field intensity has bigger lifting than its value of product that traditional design is done.Below explain with concrete embodiment.
Embodiment 1
The product specification that present embodiment is selected for use be micro machine with permanent-magnet ferrite watt type magnet, the inner code name of product is W-284, the specification shape is seen Fig. 5, wherein, when T is the Surface field ionization meter, the hall probe set-point.
Moulding uses grind size at 0.85 slip.Its material main performance: remanent magnetism is greater than 3950 Gausses, and HCJ is greater than 3850 oersteds.
The measurement comparing result of final products is seen table 1
Measure item: inner arc meta Surface field intensity and center field intensity.
Used utensil: the digital milli Tesla meter of WT-3A type. permanent logical scientific and technological development company of Nanjing University produces.
Table 1
Can find out that from the comparing data of table 1 the new effect that magnetic structure produced is very much obvious.Bit table magnetic increases closely 80% in the intrados of magnetic shoe, and central field increases more than 6%.The bit table field then reduces 4.76%. in the extrados
This example is identical with last one routine material therefor, and product specification is R16.9*r12*W30*L37.
The measurement of comparison result of final products sees table 2
From the data of table 2, can significantly see of the contribution of new magnetic structure equally to intrados meta table magnetic and central field.The bit table field has increased closely 30% in the inner arc of this products, and central field increases about 3.7%.
Above-described content is merely the basic explanation of the present invention under conceiving, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (4)
1. the magnetic structure of one kind high central field magnetic shoe mould comprises the upper and lower drift of being processed by permeability magnetic material (1,3); It is characterized in that: be embedded with upper and lower non-magnet_conductible material layer (2 on the die cavity of said upper and lower drift respectively; 4), form effective flux refraction face, wherein:
The shape of the last non-magnet_conductible material layer (2) of upper punch (1) is by both sides L, L1 line segment; B top line segment is formed; Wherein L, L1 line segment are straightway, and B top line segment is arc or straightway, L; The angle of L1 line segment and profile is between 50 °～72 °, and the vertical thickness H in last non-magnet_conductible material layer (2) top is 2～2.5 times of its limit base thickness degree h; Limit base thickness degree h is 4～10 millimeters;
The following non-magnet_conductible material layer (4) of low punch (3) and the chimeric shape between the magnetic conductive material layer matrix are by the top camber line, and both sides straight line and base camber line are formed, the formed angle β of two straightways=2 (90 °-α)+(0 °～11 °); Following non-magnet_conductible material layer (4) both sides thickness h 1 is 8～15 millimeters; Inlay tip thickness c is 1.5～2 millimeters, and top camber line width f1 is 0.32～0.35 times low punch width F, and between both sides straight line and the camber line junction, base is 0.56～0.6 times low punch width F apart from f2.
2. the magnetic structure of high central field magnetic shoe mould according to claim 1 is characterized in that: when the B line segment of said upper punch was camber line, its radius was 1.4～1.5 times of profile arc radius R '.
3. the magnetic structure of high central field magnetic shoe mould according to claim 1 is characterized in that: the top radius of curvature r of said low punch is 0.51～0.6 times of its following non-magnet_conductible material layer (4) upper end radius of curvature R; Base radius of curvature r ' is 1.58～1.63 times of top radius of curvature r.
4. an application rights requires the made magnet of magnetic structure of each described high central field magnetic shoe mould in 1 to 3, and it is characterized in that: the Surface field intensity of magnet intrados meta is 1.8～4.5 times of extrados meta Surface field intensity.
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| CN2010102476264A CN101934551B (en) | 2010-08-09 | 2010-08-09 | Magnetic circuit structure of high-central-field magnetic shoe mould |
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| CN107579628A (en) * | 2017-08-30 | 2018-01-12 | 浙江凯文磁钢有限公司 | A kind of method for manufacturing radial radiation orientation rare-earth permanent magnet ferrite arch magnet |
| CN109514706A (en) * | 2018-11-27 | 2019-03-26 | 闫溪 | A kind of permanent-magnet ferrite mold Optimize magnetic circult structure |
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| CN201323128Y (en) * | 2008-11-28 | 2009-10-07 | 东莞创慈磁性元件有限公司 | High power planar transformer |
| CN201534370U (en) * | 2009-04-22 | 2010-07-28 | 邓崇岭 | Axially oriented die for large-scale ferrite plastic-magnetic product |
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Owner name: ANHUI JINZHAI JIANGJUN MAGNETIC MATERIALS + DEVICE Free format text: FORMER OWNER: LONGCI ELECTRONICS TECH CO., LTD., SHANGHAI Effective date: 20130823 |
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Effective date of registration: 20130823 Address after: 237300 Jinzhai Economic Development Zone, Anhui, Lu'an Patentee after: Anhui Jinzhai Jiangjun Magnetic Industry Co.,Ltd. Address before: 201517 Shanghai city Jinshan District Lu Zhen Lu Qing Road No. 185 Patentee before: Shanghai Longci Electronic Technology Co., Ltd. |