CN102360697B - Annular magnet with radial magnetic orientation - Google Patents
Annular magnet with radial magnetic orientation Download PDFInfo
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- CN102360697B CN102360697B CN 201110227853 CN201110227853A CN102360697B CN 102360697 B CN102360697 B CN 102360697B CN 201110227853 CN201110227853 CN 201110227853 CN 201110227853 A CN201110227853 A CN 201110227853A CN 102360697 B CN102360697 B CN 102360697B
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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
Extensive use along with the magnetic force technology, in order to reach energy-conservation purpose, the magnetic force technology is applied to such as magnetically prestressed bearing, fully permanent magnet suspension horizontal motor, magnetic-suspension high-speed centrifuge 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 literature CN101794656A discloses a kind of knockdown radiation ring magnet, jointly forms the integral type magnet ring structure 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 first 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 literature 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 larger angle to incline to tremble, this part in magnet shared volume ratio 2% or larger and 50% or less scope in; And radial oriented or along the part with the direction orientation that tilts with the angles that radially become less than 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 literature 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 the 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 namely adopt the 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 this magnet can guarantee the uniformity of the magnetic property along the circumferential direction gone up, also can guarantee the uniformity of magnetic property vertically, and can be magnetized as required, form the radiation ring of the 2n utmost point.
In order to estimate 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 adopt with annular magnet carry out monopole radiation magnetize saturated after (the outer S of the outer N of interior S or interior N), it is moving and table field wave vertically is moving to measure respectively along the circumferential direction table field wave.
The table field wave of circumferencial direction is moving=the table field minimum value of (the table field minimum value of the table field maximum-circumferencial direction of circumferencial direction)/circumferencial direction.
Axial table field wave is moving=the table field minimum value of (axial table field maximum-axial table field minimum value)/circumferencial direction.
In order to realize purpose of the present invention, the invention provides a kind of magnetic aligning is radial annular magnet, and the preparation process of described annular magnet comprises batching, powder process, orientation die mould, sintering, machine work; It is characterized in that: when the orientation die mould, employing is axial perpendicular to annular die cavity 11, and the planar radiation shape magnetic field centered by the center of circle of annular die cavity 11 cross sections, magnetic in the annular die cavity 11 is orientated, be provided with the internal magnetic pole 12 for magnetic conduction in the described annular die cavity 11, described internal magnetic pole 12 is arranged on the center in radial magnetic field, described radial magnetic field produces by the device 10 that radial magnetic field is provided, the described device 10 in radial magnetic field that provides is made of the needle-like magnetic conductive rod 13 of closely arranging around annular die cavity radially that arranges in a plane, described needle-like magnetic conductive rod 13 is used for the guiding externally-applied magnetic field and forms 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, described magnet is carried out after monopole radiation magnetizes, on the external cylindrical surface of magnet, the table field wave of circumferencial direction is moving to be lower than 7%, and axial table field wave is moving to be lower than 7%.
The table field wave of circumferencial direction is moving=the table field minimum value of (the table field minimum value of the table field maximum-circumferencial direction of circumferencial direction)/circumferencial direction,
Axial table field wave is moving=the table field minimum value of (axial table field maximum-axial table field minimum value)/circumferencial direction.
Above-mentioned magnetic aligning is radial annular magnet, and further preferred, magnet is 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 wave along the circumferential direction is moving to be lower than 5%, and table field wave vertically is moving to be lower than 5%.
Further preferred, table field wave along the circumferential direction is moving to be lower than 4%, and table field wave vertically is moving to be lower than 4%.
Further preferred, table field wave along the circumferential direction is moving to be lower than 3%, and table field wave vertically is moving to be lower than 3%.
Preferably, the described device in radial magnetic field that provides is along die cavity setting at least 2 covers.
Preferably, described externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, described 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 schematic diagram of die cavity;
Fig. 2: needle-like magnetic conductive rod schematic diagram among the present invention;
Fig. 3: equipment of the present invention is along die cavity schematic diagram 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
The below is described further the specific embodiment of the present invention.
1-3 comes the orientation tamping plant that the present invention adopts is described by reference to the accompanying drawings.
The orientation tamping plant that the present invention adopts, comprise: pressure head 15, the annular die cavity 11 that is used for accommodating 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, described moving component 16 the described device 10 in radial magnetic field that provides is provided moves back and forth along annular die cavity 11, is provided with the internal magnetic pole 12 for magnetic conduction in the die cavity 11, and described internal magnetic pole 12 is arranged on the center in radial magnetic field.
Particularly, the described device 10 in radial magnetic field that provides is made of the needle-like magnetic conductive rod 13 of closely arranging radially that arranges in a plane, and described needle-like magnetic conductive rod 13 is used for the guiding externally-applied magnetic field and forms radial magnetic field.
Particularly, described externally-applied magnetic field is provided by the hot-wire coil 14 that is wrapped on the needle-like magnetic conductive rod, and perhaps, described externally-applied magnetic field is provided by permanent magnet or electromagnet.
Particularly, the described device that radial magnetic field is provided arranges 2 covers or more than 2 covers along die cavity.
Preferably, the diameter of the close die cavity end of described needle-like magnetic conductive rod is less than the diameter of the other end.
Particularly, described 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, then to carry out melting 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, radial magnetic field is moved along the axial reciprocating of annular die cavity 11, after the magnetic orientation was abundant, 15 pairs of magnetics of pressure head were 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 respectively magnet table field maximum and minimum value in axial direction and is along the circumferential direction table field maximum and minimum value.As shown in table 1
Table 1 neodymium-iron-boron body surface field wave moves 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, then to carry out melting 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, radial magnetic field is moved along the axial reciprocating of annular die cavity 11, after the magnetic orientation was abundant, 15 pairs of magnetics of pressure head were 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 respectively magnet table field maximum and minimum value in axial direction 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 wave moves 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 respectively magnet table field maximum and minimum value in axial direction to be, and along the circumferential direction table field maximum and minimum value, as shown in table 3.
Table 3 neodymium-iron-boron body surface field wave moves 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 respectively magnet table field maximum and minimum value in axial direction and is along the circumferential direction table field maximum and minimum value.As shown in table 4
Table 4 samarium cobalt magnet table field wave moves data
By embodiment 1 and Comparative Examples 1, the contrast of embodiment 2 and Comparative Examples 2, can find, to be that the table field wave of circumferencial direction of radial annular magnet is moving be lower than 7% to magnetic aligning of the present invention, axial table field wave is moving to be lower than 7%, and the magnetic aligning that adopts the method manufacturing among the patent CN100407347C to be the table field wave of circumferencial direction of radial annular magnet moving is higher than 7%, axial table field wave is moving to be higher than 7%, this just magnet of the present invention improved magnetic aligning and be the circumferencial direction of radial annular magnet and the uniformity of axial table field with respect to the improvements of magnet of the prior art.
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 to 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 described annular magnet comprises batching, powder process, orientation die mould, sintering, machine work; It is characterized in that: when the orientation die mould, employing is axial perpendicular to annular die cavity (11), and the planar radiation shape magnetic field centered by the center of circle of annular die cavity (11) cross section, magnetic in the annular die cavity (11) is orientated, be provided with the internal magnetic pole (12) for magnetic conduction in the described annular die cavity (11), described internal magnetic pole (12) is arranged on the center in radial magnetic field, described radial magnetic field produces by the device (10) that radial magnetic field is provided, the described device (10) in radial magnetic field that provides is made of the needle-like magnetic conductive rod (13) of closely arranging around annular die cavity radially that arranges in a plane, described needle-like magnetic conductive rod (13) is used for the guiding externally-applied magnetic field and forms radial magnetic field, described externally-applied magnetic field is provided by the hot-wire coil (14) that is wrapped on the needle-like magnetic conductive rod
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 described magnet carry out monopole radiation magnetize saturated after, on the external cylindrical surface of magnet, the table field wave of circumferencial direction is moving to be lower than 7%, axial table field wave is moving to be lower than 7%.
2. magnetic aligning according to claim 1 is radial annular magnet, it is characterized in that described magnet is Nd-Fe-Bo permanent magnet material, or samarium-cobalt permanent-magnetic material, or dry method opposite sex Ferrite Material.
3. the annular magnet of radial magnetic aligning according to claim 1 is characterized in that along the circumferential direction table field wave is moving and is lower than 5%, or table field wave vertically is moving is lower than 5%.
4. the annular magnet of radial magnetic aligning according to claim 1 is characterized in that along the circumferential direction table field wave is moving and is lower than 4%, or table field wave vertically is moving is lower than 4%.
5. the annular magnet of radial magnetic aligning according to claim 1 is characterized in that along the circumferential direction table field wave is moving and is lower than 3%, or table field wave vertically is moving is lower than 3%.
6. the annular magnet of arbitrary described radial magnetic aligning according to claim 1-5 is characterized in that the described device in radial magnetic field that provides is along die cavity setting at least 2 covers.
7. magnetic aligning according to claim 1 is radial annular magnet, it is characterized in that described magnet is binding electromagnetic material.
Priority Applications (1)
| 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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| Publication Number | Publication Date |
|---|---|
| CN102360697A CN102360697A (en) | 2012-02-22 |
| CN102360697B true CN102360697B (en) | 2013-05-29 |
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|---|---|---|---|
| CN 201110227853 Expired - Fee Related CN102360697B (en) | 2011-08-10 | 2011-08-10 | Annular magnet with radial magnetic orientation |
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Citations (4)
| 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 |
| CN101174503A (en) * | 2007-01-30 | 2008-05-07 | 宁波大学 | Manufacturing method of radiation orientation magnetic 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 a radially oriented annular magnet |
| CN101794656A (en) * | 2010-01-08 | 2010-08-04 | 宁波迪麦格磁电科技有限公司 | Magnetic radiation ring |
Family Cites Families (1)
| 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 |
-
2011
- 2011-08-10 CN CN 201110227853 patent/CN102360697B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| CN101174503A (en) * | 2007-01-30 | 2008-05-07 | 宁波大学 | Manufacturing method of radiation orientation magnetic 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 a radially oriented annular magnet |
| CN101794656A (en) * | 2010-01-08 | 2010-08-04 | 宁波迪麦格磁电科技有限公司 | Magnetic radiation ring |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-35786A 2007.02.08 |
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