CN102360697A - Annular magnet with radial magnetic orientation - Google Patents
Annular magnet with radial magnetic orientation Download PDFInfo
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- CN102360697A CN102360697A CN2011102278535A CN201110227853A CN102360697A CN 102360697 A CN102360697 A CN 102360697A CN 2011102278535 A CN2011102278535 A CN 2011102278535A CN 201110227853 A CN201110227853 A CN 201110227853A CN 102360697 A CN102360697 A CN 102360697A
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Abstract
The invention provides an annular magnet with radial magnetic orientation. A process for preparing the annular magnet comprises the following steps of: preparing materials, powdering, performing orientation pressing, sintering and machining; the annular magnet is characterized in that: during orientation pressing, magnetic powder in an annular die cavity (11) is orientated by adopting a planar radial magnetic field which is vertical to an axial direction of the annular die cavity (11) and centered by a circle center of a cross section of the annular die cavity (11); an inner magnetic pole (12) for magnetizing is arranged in the annular die cavity (11); the inner magnetic pole (12) is arranged in the center of the radial magnetic field; the radial magnetic field is generated by a device (10) for supplying the radial magnetic field; the device (10) for supplying the radial magnetic field consists of needle-shaped magnetizing sticks (13) which are compactly arranged in a plane and encircle the annular die cavity in a radial manner; the needle-shaped magnetizing sticks (13) are used for leading an external magnetic field to form the radial magnetic field; and during orientation, the radial magnetic field does reciprocating motion along the axial direction of the annular die cavity so as to orientate the magnetic powder in the annular die cavity. Furthermore, after the magnet is magnetized saturatedly through monopole radiation, on the outer cylindrical surface of the magnet, the surface field fluctuation of a circumferential direction is less than 7 percent and the surface field fluctuation of an axial direction is less than 7 percent; therefore, the magnet can guarantee the uniformity of magnetism along the circumferential direction and the uniformity of the magnetism along the axial direction; and the magnet is magnetized as required so as to form a radiation ring with 2n poles.
Description
Technical field
The present invention relates to a kind of permanent magnet, relating in particular to magnetic aligning is radial annular magnet
Technical background
Along with the magnetic force broad application; In order to reach purpose of energy saving; The magnetic force technology is applied to like magnetically prestressed bearing, fully permanent magnet suspension horizontal motor, magnetic suspension supercentrifuge etc., and the permanent magnetic material that needs requires annular and often with radial magnetic field.
Open day is that on 08 04th, 2010 Chinese patent document CN101794656A discloses a kind of knockdown radiation ring magnet, is integrally formed formula magnet ring structure jointly by outer retaining ring body and several piece arcuation magnet steel.The radiation ring magnet of this structure has following shortcoming: 1) be not one-shot forming, need to make separately earlier the arcuation magnet steel, and then be assembled into; 2) magnetic aligning of each piece arcuation magnet steel is not the strict sensing center of circle; 3) be difficult to guarantee the radiation ring on the whole magnetic property evenly; 4) number of magnetic poles is fixed, and can not be magnetized into the radiation ring of the 2n utmost point on demand.
The Chinese patent document CN1420504A that open day is on May 28th, 2003 discloses a kind of radial anisotropic sintered magnet of global formation; This magnet along with the part of the direction orientation that radially becomes 30 degree angles or bigger angle to incline to tremble, this part in magnet shared volume ratio 2% or bigger with 50% or littler scope in; And radial oriented or along with the part that radially becomes less than the direction orientation of the angle tilt of 30 degree, this part accounts for the residual volume of magnet cumulative volume.This magnet is by following defective: can not guarantee magnet radial magnetic aligning on the whole, thereby cause the uniformity of magnet magnetic property along the circumferential direction not guarantee.
The day for announcing is the preparation method that the Chinese patent document CN100407347C on July 30th, 2008 discloses a kind of radiation orientation integral permanent magnetic ring: adopt the magnetic field of two homopolarities to repel, produce radial magnetic field, magnetic is orientated.Yet the radial magnetic field that this method produces is the strongest at the middle part of circular or cylindrical magnet; Two ends a little less than, the radial annulus or the cylindrical magnet that promptly adopt this method to make, the middle part degree of orientation is better vertically; And the two ends degree of orientation is relatively poor, thus the table field that makes magnet skewness vertically.
Summary of the invention
The objective of the invention is; The magnetic aligning that a kind of radiation direction is provided is annular magnet adequately and uniformly, and the uniformity of the magnetic property that this magnet can guarantee along the circumferential direction to go up also can guarantee the uniformity of magnetic property vertically; And can be magnetized as required, formed the radiation ring of the 2n utmost point.
In order to estimate the uniformity that magnetic aligning is the magnetic property along the circumferential direction gone up of radial annular magnet and the uniformity of magnetic property vertically; The present invention adopts annular magnet is carried out the monopole radiation saturated back (the outer N of interior S or in the outer S of N) of magnetizing, and measures along the circumferential direction fluctuation of table field and vertically table field fluctuation respectively.
The table field minimum value of table field fluctuation=(the table field minimum value of the table field maximum-circumferencial direction of the circumferencial direction)/circumferencial direction of circumferencial direction.
The table field minimum value of axial table field fluctuation=(axial table field maximum-axial table field minimum value)/circumferencial direction.
In order to realize the object of the invention, it is radial annular magnet that the present invention provides a kind of magnetic aligning, and the preparation process of said annular magnet comprises batching, powder process, orientation die mould, sintering, machine work; It is characterized in that: in orientation during die mould, adopting axially perpendicular to annular die cavity 11, and is the planar radiation shape magnetic field at center with the center of circle of annular die cavity 11 cross sections; Magnetic in the annular die cavity 11 is orientated, and is provided with the internal magnetic pole 12 that is used for magnetic conduction in the said annular die cavity 11, and said internal magnetic pole 12 is arranged on the center in radial magnetic field; Said radial magnetic field produces through the device 10 that radial magnetic field is provided, and the said device 10 in radial magnetic field that provides is made up of the needle-like magnetic conductive rod 13 of closely arranging around annular die cavity radially that in a plane, is provided with, and said needle-like magnetic conductive rod 13 is used to guide externally-applied magnetic field to form radial magnetic field; In the orientation process; Radial magnetic field is along the axially reciprocating of annular die cavity 11, thereby the magnetic in the annular die cavity 11 is orientated, and; Said magnet is carried out after monopole radiation magnetizes; On the external cylindrical surface of magnet, the fluctuation of the table field of circumferencial direction is lower than 7%, and axial table field fluctuation is lower than 7%.
The table field minimum value of table field fluctuation=(the table field minimum value of the table field maximum-circumferencial direction of the circumferencial direction)/circumferencial direction of circumferencial direction,
The table field minimum value of axial table field fluctuation=(axial table field maximum-axial table field minimum value)/circumferencial direction.
Above-mentioned magnetic aligning is radial annular magnet, and further preferred, magnet is a Nd-Fe-B rare earth permanent magnetic material, or samarium-cobalt permanent-magnetic material, or binding electromagnetic material.
Above-mentioned magnetic aligning is radial annular magnet, and is further preferred, and table field fluctuation along the circumferential direction is lower than 5%, and table field fluctuation vertically is lower than 5%.
Further preferred, table field fluctuation along the circumferential direction is lower than 4%, and table field fluctuation vertically is lower than 4%.
Further preferred, table field fluctuation along the circumferential direction is lower than 3%, and table field fluctuation vertically is lower than 3%.
Preferably, the said device that radial magnetic field is provided is along die cavity setting at least 2 covers.
Preferably, said externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, said externally-applied magnetic field is provided by permanent magnet or electromagnet.
Description of drawings
Fig. 1: equipment of the present invention is along the axial sketch map of die cavity;
Fig. 2: needle-like magnetic conductive rod sketch map among the present invention;
Fig. 3: equipment of the present invention is along die cavity sketch map radially;
Reference numeral: 10: the device that radial magnetic field is provided; 11: annular die cavity; 12: internal magnetic pole; 13: the needle-like magnetic conductive rod; 14: be wrapped in the coil on the needle-like magnetic conductive rod; 15: pressure head; 16: moving component; 17: cam mechanism.
Embodiment
Following specific embodiments of the invention is done and is further described.
Come the orientation tamping plant that the present invention adopts is described in conjunction with accompanying drawing 1-3.
The orientation tamping plant that the present invention adopts; Comprise: pressure head 15, be used for the annular die cavity 11 of ccontaining magnetic, it is characterized in that: also comprise the device that radial magnetic field is provided 10 around the die cavity setting; And moving component 16; Said moving component 16 drives the said device 10 in radial magnetic field that provides and moves back and forth along annular die cavity 11, is provided with the internal magnetic pole 12 that is used for magnetic conduction in the die cavity 11, and said internal magnetic pole 12 is arranged on the center in radial magnetic field.
Particularly, the said device 10 in radial magnetic field that provides is made up of the needle-like magnetic conductive rod 13 of closely arranging radially that in a plane, is provided with, and said needle-like magnetic conductive rod 13 is used to guide externally-applied magnetic field to form radial magnetic field.
Particularly, said externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, said externally-applied magnetic field is provided by permanent magnet or electromagnet.
Particularly, the said device that radial magnetic field is provided is provided with 2 covers or more than 2 covers along die cavity.
Preferably, said needle-like magnetic conductive rod is near the diameter of the die cavity end diameter less than the other end.
Particularly, said moving component is by slider-crank mechanism or cam mechanism.
Embodiment 1
Magnetic aligning is the manufacturing of radial Nd-Fe-B series rare-earth permanent magnet.
The alloying component of the Nd-Fe-B series rare-earth permanent magnet that adopts is: Nd
13.5Dy
0.5B
5.8Al
0.7Cu
0.05Fe
Surplus(atomic fraction %).By alloying component batching, to carry out melting then and obtain ingot casting, powder process obtains average grain diameter at 3.5 microns magnetic.With the magnetic annular die cavity 11 of packing into, apply radial magnetic field, make radial magnetic field axially moving back and forth along annular die cavity 11; After treating that the magnetic orientation fully, 15 pairs of magnetics of pressure head are exerted pressure, after the moulding; Take out annular blank; Blank is carried out sintering, machine work, and to obtain external diameter and be 33mm, internal diameter be 25mm, highly for the magnetic aligning of 3.4mm is 10 of radial annular magnet, and code name is respectively 1-1 to 1-10.
The magnet one pole is magnetized, and the outer N of interior S (the outer S of N perhaps) measures magnet table field maximum and minimum value in axial direction respectively and is along the circumferential direction table field maximum and minimum value.As shown in table 1
Table 1 neodymium iron boron magnetic body table field fluctuation data
Embodiment 2
Magnetic aligning is the manufacturing of radial samarium cobalt permanent magnet body.
The alloying component of the samarium-cobalt permanent-magnetic material that adopts is: Sm (Co
0.69Fe
0.2Cu
0.1Zr
0.01)
7.2(atomic fraction %).
By alloying component batching, to carry out melting then and obtain ingot casting, powder process obtains average grain diameter at 5 microns magnetic.With the magnetic annular die cavity 11 of packing into, apply radial magnetic field, make radial magnetic field axially moving back and forth along annular die cavity 11; After treating that the magnetic orientation fully, 15 pairs of magnetics of pressure head are exerted pressure, after the moulding; Take out annular blank; Blank is carried out sintering, machine work, and to obtain external diameter and be 36mm, internal diameter be 31mm, highly for the magnetic aligning of 5mm is 10 of radial annular magnet, and code name is respectively 2-1 to 2-10.
The magnet one pole is magnetized, and the outer N of interior S (the outer S of N perhaps) measures magnet table field maximum and minimum value in axial direction respectively and is along the circumferential direction table field maximum and minimum value.It is as shown in table 2.
Table 2 samarium cobalt magnet table field fluctuation data
Comparative Examples 1
Adopt alloying component and powder among the embodiment 1; The preparation method adopts the method for the CN100407347C of background technology; The preparation external diameter be 33mm, internal diameter be 25mm, highly for the magnetic aligning of 3.4mm is 10 of radial annular magnet, code name is respectively 3-1 to 3-10.
The magnet one pole is magnetized, and interior S is N (the outer S of N perhaps) outward, measure magnet table field maximum and minimum value in axial direction respectively to do, and along the circumferential direction table field maximum and minimum value, as shown in table 3.
Table 3 neodymium iron boron magnetic body table field fluctuation data
Comparative Examples 2
Adopt alloying component and powder among the embodiment 2; The preparation method adopts the method for the CN100407347C of background technology; The preparation external diameter be 36mm, internal diameter be 31mm, highly for the magnetic aligning of 5mm is 10 of radial annular magnet, code name is respectively 4-1 to 4-10.
The magnet one pole is magnetized, and the outer N of interior S (the outer S of N perhaps) measures magnet table field maximum and minimum value in axial direction respectively and is along the circumferential direction table field maximum and minimum value.As shown in table 4
Table 4 samarium cobalt magnet table field fluctuation data
Through the contrast of embodiment 1 with Comparative Examples 1, embodiment 2 and Comparative Examples 2; Can find; Magnetic aligning of the present invention is that the table field fluctuation of the circumferencial direction of radial annular magnet is lower than 7%; The fluctuation of axial table field is lower than 7%, is that the table field fluctuation of the circumferencial direction of radial annular magnet is higher than 7% and adopt the magnetic aligning of the method manufacturing among the patent CN100407347C, and axial table field fluctuation is higher than 7%; This magnet of the present invention just is with respect to the improvements of magnet of the prior art, improved magnetic aligning and be the circumferencial direction of radial annular magnet and the uniformity of axial table field.
What should be noted that is: magnet of the present invention can also be bonded permanent magnet or dry method opposite sex ferrite; Its production process repeats no more as the common practise of this area, and what only need change is; When the orientation die mould, adopt method for alignment of the present invention that magnet is orientated to magnet.
Claims (7)
1. a magnetic aligning is radial annular magnet, and the preparation process of said annular magnet comprises batching, powder process, orientation die mould, sintering, machine work; It is characterized in that: in orientation during die mould, adopting perpendicular to annular die cavity (11) axially, and is the planar radiation shape magnetic field at center with the center of circle of annular die cavity (11) cross section; Magnetic in the annular die cavity (11) is orientated, and is provided with the internal magnetic pole (12) that is used for magnetic conduction in the said annular die cavity (11), and said internal magnetic pole (12) is arranged on the center in radial magnetic field; Said radial magnetic field produces through the device (10) that radial magnetic field is provided; The said device (10) in radial magnetic field that provides is made up of the needle-like magnetic conductive rod (13) of closely arranging around annular die cavity radially that in a plane, is provided with, and said needle-like magnetic conductive rod (13) is used to guide externally-applied magnetic field to form radial magnetic field, in the orientation process; Radial magnetic field is along the axially reciprocating of annular die cavity (11); Thereby the magnetic in the annular die cavity (11) is orientated, to said magnet carry out monopole radiation magnetize saturated after, on the external cylindrical surface of magnet; The table field fluctuation of circumferencial direction is lower than 7%, and axial table field fluctuation is lower than 7%.
2. magnetic aligning according to claim 1 is radial annular magnet, it is characterized in that described magnet is a Nd-Fe-Bo permanent magnet material, or samarium-cobalt permanent-magnetic material, or binding electromagnetic material, or dry method opposite sex Ferrite Material.
3. the annular magnet of radial magnetic aligning according to claim 1 it is characterized in that table field fluctuation along the circumferential direction is lower than 5%, or the fluctuation of table field vertically is lower than 5%.
4. the annular magnet of radial magnetic aligning according to claim 1 it is characterized in that table field fluctuation along the circumferential direction is lower than 4%, or the fluctuation of table field vertically is lower than 4%.
5. the annular magnet of radial magnetic aligning according to claim 1 it is characterized in that table field fluctuation along the circumferential direction is lower than 3%, or the fluctuation of table field vertically is lower than 3%.
6. according to the annular magnet of arbitrary described radial magnetic aligning of claim 1-5, it is characterized in that the said device that radial magnetic field is provided is along die cavity setting at least 2 covers.
7. according to the annular magnet of arbitrary described radial magnetic aligning of claim 1-5, it is characterized in that said externally-applied magnetic field is provided by the hot-wire coil (14) that is wrapped on the needle-like magnetic conductive rod, perhaps, said externally-applied magnetic field is provided by permanent magnet or electromagnet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110227853 CN102360697B (en) | 2011-08-10 | 2011-08-10 | Annular magnet with radial magnetic orientation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110227853 CN102360697B (en) | 2011-08-10 | 2011-08-10 | Annular magnet with radial magnetic orientation |
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| CN102360697B CN102360697B (en) | 2013-05-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794385A (en) * | 2005-11-16 | 2006-06-28 | 北京科技大学 | Preparation method of radiation orientation integral permanent magnetic ring |
| JP2007035786A (en) * | 2005-07-25 | 2007-02-08 | Daido Electronics Co Ltd | Radial orientation magnetic field forming apparatus |
| CN101174503A (en) * | 2007-01-30 | 2008-05-07 | 宁波大学 | Production method of radiation-orienting magnet ring |
| CN101256898A (en) * | 2008-03-27 | 2008-09-03 | 深圳市天盈德科技有限公司 | Method and apparatus for forming of radiation orientating round ring-shaped magnetic body |
| CN101794656A (en) * | 2010-01-08 | 2010-08-04 | 宁波迪麦格磁电科技有限公司 | Magnetic radiation ring |
-
2011
- 2011-08-10 CN CN 201110227853 patent/CN102360697B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007035786A (en) * | 2005-07-25 | 2007-02-08 | Daido Electronics Co Ltd | Radial orientation magnetic field forming apparatus |
| CN1794385A (en) * | 2005-11-16 | 2006-06-28 | 北京科技大学 | Preparation method of radiation orientation integral permanent magnetic ring |
| CN101174503A (en) * | 2007-01-30 | 2008-05-07 | 宁波大学 | Production method of radiation-orienting magnet ring |
| CN101256898A (en) * | 2008-03-27 | 2008-09-03 | 深圳市天盈德科技有限公司 | Method and apparatus for forming of radiation orientating round ring-shaped magnetic body |
| CN101794656A (en) * | 2010-01-08 | 2010-08-04 | 宁波迪麦格磁电科技有限公司 | Magnetic radiation ring |
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