CN102456463A - Method for preparing multipolar orientation annular magnet and device for implementing method - Google Patents
Method for preparing multipolar orientation annular magnet and device for implementing method Download PDFInfo
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- CN102456463A CN102456463A CN2010105205796A CN201010520579A CN102456463A CN 102456463 A CN102456463 A CN 102456463A CN 2010105205796 A CN2010105205796 A CN 2010105205796A CN 201010520579 A CN201010520579 A CN 201010520579A CN 102456463 A CN102456463 A CN 102456463A
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- 230000005405 multipole Effects 0.000 claims abstract description 73
- 238000002360 preparation method Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000000696 magnetic material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 2
- 230000005415 magnetization Effects 0.000 abstract description 9
- 239000006247 magnetic powder Substances 0.000 abstract 5
- 238000005259 measurement Methods 0.000 description 17
- 238000009826 distribution Methods 0.000 description 9
- 238000000748 compression moulding Methods 0.000 description 8
- 238000007796 conventional method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000000205 computational method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- RIVZIMVWRDTIOQ-UHFFFAOYSA-N cobalt iron Chemical compound [Fe].[Co].[Co].[Co] RIVZIMVWRDTIOQ-UHFFFAOYSA-N 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention provides a method for preparing a multi-pole orientation annular magnet, which comprises the following steps: filling magnetic powder into a groove between a mold core and a female mold of the mold, arranging two magnetic conduction devices outside a mold sleeve, wherein the included angle between the two magnetic conduction devices is equal to the angle of a pair of magnetic poles in the multi-pole orientation annular magnet; magnetizing and orienting the magnetic powder by adopting an external magnetic pole-external magnetic pole type oriented magnetic field; controlling the rotation angle theta of the oriented magnetic field or the mold filled with magnetic powder by a stepping motor, wherein the angle theta is equal to the angle of a pair of magnetic poles in the multi-pole oriented annular magnet, and then magnetizing and orienting the magnetic powder by adopting the oriented magnetic field; continuing to rotate the oriented magnetic field or the mold according to the above mode, and magnetizing and orienting the magnetic powder by adopting the oriented magnetic field until 360-degree magnetization and orientation are completed; and (5) pressing and forming. The invention also provides a device for implementing the preparation method. The preparation method has high efficiency and low cost.
Description
Technical field
The present invention relates to a kind of method for preparing multipole orientation annular magnetic, the invention still further relates to the structure that the rotating field that is used to adopt this preparation method prepares multipole oriented ring.
Background technology
Sintered multipolar magnetizes to encircle and is with a wide range of applications at machine field.The preparation sintered multipolar magnetizes and encircles the following two kinds of methods that mainly contain at present.A kind of is through to the radially radially oriented annular magnetic of top magnetic field orientating method preparation, obtains multipole magnetization ring (as shown in Figure 1) through interior external diameter multipole magnetization then, and magnet ring internal magnetization intensity is arranged along radial direction.The table magnetic of the multipole magnetization ring that obtains in this way is relatively low.And make when preparing the less radially oriented ring of magnet ring internal diameter in this way; Alignment magnetic field reduces greatly; Thereby cause the magnetic orientation not exclusively; And the strength reduction of alignment magnetic field not only when the magnet ring height is higher, and uniformity variation, thereby cause the magnetic property of multipole magnetization ring and consistency to degenerate.
Another kind method is to prepare the multistage ring that magnetizes through an oriented coils and the coil that magnetizes.Directly use the difference with number of poles according to the magnet ring inside/outside; Oriented coils is arranged the magnetic in the magnet ring according to the magnetic line of force direction that designs; Thereby can reach best magnetic characteristic, the coil of arranging with the similar magnetic line of force then that magnetizes magnetizes and obtains multipole magnetization ring (as shown in Figure 2).Multipole oriental magnetic ring is for radially oriented magnetic ring, and its table magnetic is generally wanted high 30%-50%, and the distributed wave of 360 degree directions is also more even.Therefore the development of multipole oriental magnetic ring and application will be more wide also.But this preparation method needs supporting corresponding use of coil when being orientated and magnetizing.Even under the situation of the multipole magnetization ring for preparing same size, the requirement of different numbers of poles also needs the different orientations and the coil that magnetizes.So just caused inefficiency, cost to increase.
The application of application number position 200710106670.1 provides a kind of preparation method of radially radially oriented ring.Because its orientation field or mould all are to rotate continuously, therefore can not prepare multipole oriental magnetic ring
Summary of the invention
One object of the present invention is to provide a kind of method for preparing multipole orientation annular magnetic, and said method comprises the steps:
(1) magnetic is filled in groove between core rod and the former of mould, and two magnetic conduction devices are set outside die sleeve, the angle between said two magnetic conduction devices equals the angle of a pair of magnetic pole in the said multipole orientation annular magnetic;
(2) adopt the outer magnetic pole-outer magnetic pole formula alignment magnetic field that produces by said two magnetic conduction devices that said magnetic is orientated;
(3) through the said outer magnetic pole of step motor control-outer magnetic pole formula alignment magnetic field or the mould rotational angle θ of said magnetic is housed; Said angle θ equals the angle of a pair of magnetic pole in the said multipole orientation annular magnetic, adopts said outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic is orientated then;
(4) continue to rotate said outer magnetic pole-outer magnetic pole formula alignment magnetic field or said mould, and adopt said outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic is orientated, until the orientation of accomplishing 360 degree according to the mode of step (3).
Said method is suppressed said magnetic after also comprising the magnetization and orientation of completion to said magnetic, obtains multipole orientation annular magnetic.
Preferably, said core rod is prepared from permeability magnetic material; Said former and die sleeve are prepared from non-magnet material.
Preferably, said outer magnetic pole-outer magnetic pole formula alignment magnetic field is the pulsed magnetic field that stationary magnetic field or rule change.
Preferably, said multipole orientation annular magnetic comprises 4 utmost points, 8 utmost points, 16 utmost points, 24 utmost points orientation annular magnetic.
Preferably, said multipole orientation annular magnetic is 8 utmost points orientation annular magnetic, and the angle between said two magnetic conduction devices is 45 degree.
Another object of the present invention is to provide a kind of rotating field that adopts above-mentioned preparation method to prepare the device of multipole oriented ring; Said device comprises mould, two magnetic conduction devices and stepping motor; Wherein: said mould comprises core rod, former and die sleeve, and said former suit is arranged on outside the said core rod, to form the groove of placing magnetic; Said die sleeve suit is arranged on outside the said former, and said die sleeve and said former closely cooperate; Said two magnetic conduction devices are arranged on outside the said die sleeve, and the angle between said two magnetic conduction devices equals the angle of a pair of magnetic pole in the multipole orientation annular magnetic, and said stepping motor is connected with said two magnetic conduction devices or said mould.
Preferably, said core rod is prepared from permeability magnetic material; Said former and die sleeve are prepared from non-magnet material.Said core rod, former and die sleeve are to be provided with one heart.
In addition, said device also comprises chuck, and said chuck is fixed on the outer radius of said die sleeve.
Use preparation method of the present invention can prepare the multiple multipole orientation annular magnetic of 4 utmost points, 8 utmost points, 16 utmost points, 24 utmost points or the like.In preparation method of the present invention, the angle between two magnetic conduction devices and the number of revolutions of alignment magnetic field or mould are confirmed according to the number of poles of multipole orientation annular magnetic.For example, be the multipole orientation annular magnetic of the ends of the earth for number of poles, the angle between two magnetic conduction devices is 45 degree, only need by step motor control alignment magnetic field or mould rotate seven times, rotate 45 degree at every turn, can accomplish the orientation process of magnetic.At last magnetic is suppressed (for example two-way compacting), obtain multipole orientation annular magnetic.
Rotating field in the above-mentioned preparation method of employing of the present invention prepares in the structure of multipole oriented ring, and core rod is prepared from permeability magnetic material, and this permeability magnetic material can be any one permeability magnetic materials such as pure iron, ferrocobalt; Former and die sleeve are prepared from non-magnet material, and this non-magnet material can be that carbide alloy, nonmagnetic steel (for example 1Cr18Ni9Ti, 9Mn9) wait any one non-magnet material.
The angle of the alignment magnetic field that the method for the multipole orientation annular magnetic of preparation provided by the present invention is used is the angle of a pair of magnetic pole in this multipole orientation annular magnetic, therefore only accounts for the very fraction of these multipole orientation annular magnetic 360 degree.Under the situation that mould is confirmed, can regulate the number of poles of multipole orientation annular magnetic according to the angle of two magnetic conduction devices and through the step motor control number of revolutions, and not need to make again the orientation coil that magnetizes.Therefore method provided by the invention both can improve production efficiency, had practiced thrift production cost again.
Compare with the preparation method of existing multipole orientation annular magnetic; Method of the present invention only need be corresponding one by one with the reading on the chuck; The magnetic pole that just can accomplish in the orientation and the process that magnetizes is corresponding one by one, and need on magnet ring, not make marks, extremely loaded down with trivial details removes the magnetic pole in the corresponding orientation and the process that magnetizes.
Simultaneously, because method of the present invention uses same magnetic field as alignment magnetic field all the time, therefore guaranteed the consistency of the degree of orientation of different magnetic poles, the different angles of multipole orientation annular magnetic effectively.Therefore; Method of the present invention has solved well at present in the preparation process of multipole orientation annular magnetic that ubiquitous Distribution of Magnetic Field is inhomogeneous, magnetic is orientated inconsistent problem, thereby has overcome the defective that multipole orientation annular magnetic is easy to ftracture in sintering process, the magnetic property consistency is relatively poor.And compared with prior art, the preparation method that the application of the invention provided can improve 10～15% with the table magnetic of multipole orientation annular magnetic.
Description of drawings
Fig. 1 is the sketch map that magnetizes of the radially oriented ring of prior art;
Fig. 2 is the sketch map that magnetizes of the multipole oriented ring of prior art;
Fig. 3 is that rotating field of the present invention prepares multipole oriented ring structural representation.
Description of reference numerals is following:
Embodiment
In order further to understand structure of the present invention, characteristic and other purposes, combine appended preferred embodiment to specify as follows at present, illustrated preferred embodiment only is used to technical scheme of the present invention is described, and non-limiting the present invention
For the ease of comparing; Each embodiment of the present invention all uses identical magnetic (composition of magnetic for (percentage by weight): 27.5Nd-2.5Dy-0.25Cu-1.0B-0.9Co-Fe is surplus) to prepare multipole orientation annular magnetic, but the method for the multipole orientation annular magnetic of preparation of the present invention and the device of implementing this method do not receive the restriction of magnetic composition.
The preparation number of poles is the multipole orientation annular magnetic of 8 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 45 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 45 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 130mm, highly is 40mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Wherein, the inhomogeneity computational methods of table magnetic of circumferencial direction are following:
The table magnetic uniformity of circumferencial direction=(the N utmost point or S utmost point peak maximum-N utmost point or S utmost point peak value minimum value)/N utmost point or S utmost point peak averaging value.Wherein, the N utmost point or S utmost point peak value are meant the maximum of the N utmost point or S utmost point table magnetic, can obtain through table magnetic measurement appearance.For instance, be the multipole orientation annular magnetic of 8 utmost points for number of poles, this magnet has 4 N utmost point peak values and 4 S utmost point peak values, and then from these 4 N utmost point peak values, selects maximum and minimum value, respectively as N utmost point peak maximum and N utmost point peak value minimum value; And from these 4 S utmost point peak values, select maximum and minimum value, respectively as S utmost point peak maximum and S utmost point peak value minimum value, calculate with above-mentioned formula at last and characterize the magnetic uniformity.
The axial inhomogeneity computational methods of table magnetic are following:
The table magnetic recording level average of axial table magnetic uniformity=(the table magnetic minimum value of the table magnetic maximum-short transverse of short transverse)/short transverse.
Following examples all adopt said method.Measurement result is listed in the table 1.
Table 1
The preparation number of poles is the multipole orientation annular magnetic of 8 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 45 degree, adopts outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated.Rotate 45 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 130mm, highly is 10mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 2.
Table 2
The preparation number of poles is the multipole orientation annular magnetic of 8 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 45 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 45 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 15mm, highly is 24mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 3.
Table 3
The preparation number of poles is the multipole orientation annular magnetic of 8 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 45 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 45 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 15mm, highly is 3mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 4.
Table 4
The preparation number of poles is the multipole orientation annular magnetic of 4 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 90 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 90 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 24mm, highly is 12mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 5.
Table 5
Embodiment 6
The preparation number of poles is the multipole orientation annular magnetic of 12 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 30 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 30 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 36mm, highly is 15mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 6.
Table 6
Embodiment 7
The preparation number of poles is the multipole orientation annular magnetic of 24 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 15 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 15 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 48mm, highly is 16mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 7.
Table 7
Embodiment 8
The preparation number of poles is the multipole orientation annular magnetic of 36 utmost points: magnetic 4 is filled in groove between core rod 5 and the former 3 of mould; And two magnetic conduction devices 1 are set outside die sleeve 2; Angle between these two magnetic conduction devices 1 is 10 degree; Adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field (this outer magnetic pole-outer magnetic pole formula alignment magnetic field is produced by described these two magnetic conduction devices 1, and following examples are identical therewith) that magnetic 4 is orientated.Rotate 10 degree through step motor control outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould then, adopt outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic 4 is orientated again.Be rotated further outer magnetic pole-outer magnetic pole formula alignment magnetic field or mould in a manner mentioned above, and adopt this outer magnetic pole-outer magnetic pole formula alignment magnetic field that magnetic 4 is orientated, until the orientation of accomplishing 360 degree, compression moulding then.The external diameter of resulting multipole orientation annular magnetic is 48mm, highly is 16mm.
Use RMT-303 type table magnetic measurement appearance measure respectively this embodiment and the circumferencial direction of the multipole orientation annular magnetic of conventional method preparation with axially on the distribution of table magnetic.Measurement result is listed in the table 8.
Table 8
What need statement is that foregoing invention content and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as the qualification to protection range of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, being equal to replacement or improvement.Protection scope of the present invention is as the criterion with appended claims.
Claims (10)
1. method for preparing multipole orientation annular magnetic, said method comprises the steps:
(1) magnetic is filled in groove between core rod and the former of mould, and two magnetic conduction devices are set outside die sleeve, the angle between said two magnetic conduction devices equals the angle of a pair of magnetic pole in the said multipole orientation annular magnetic;
(2) adopt the outer magnetic pole-outer magnetic pole formula alignment magnetic field that produces by said two magnetic conduction devices that said magnetic is orientated;
(3) through the said outer magnetic pole of step motor control-outer magnetic pole formula alignment magnetic field or the mould rotational angle θ of said magnetic is housed; Said angle θ equals the angle of a pair of magnetic pole in the said multipole orientation annular magnetic, adopts said outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic is orientated then;
(4) continue to rotate said outer magnetic pole-outer magnetic pole formula alignment magnetic field or said mould, and adopt said outer magnetic pole-outer magnetic pole formula alignment magnetic field that said magnetic is orientated, until the orientation of accomplishing 360 degree according to the mode of step (3).
2. method according to claim 1 is characterized in that, also comprise the orientation of completion to said magnetic after, said magnetic is suppressed, obtain multipole orientation annular magnetic.
3. method according to claim 1 and 2 is characterized in that said core rod is prepared from permeability magnetic material; Said former and die sleeve are prepared from non-magnet material.
4. method according to claim 1 and 2 is characterized in that, said outer magnetic pole-outer magnetic pole formula alignment magnetic field is the pulsed magnetic field that stationary magnetic field or rule change.
5. method according to claim 1 and 2 is characterized in that, said multipole orientation annular magnetic comprises 4 utmost points, 8 utmost points, 16 utmost points, 24 utmost points orientation annular magnetic.
6. method according to claim 5 is characterized in that, said multipole orientation annular magnetic is 8 utmost points orientation annular magnetic, and the angle between said two magnetic conduction devices is 45 degree.
7. one kind is adopted each preparation method's device of claim 1-6, it is characterized in that, said device comprises mould, two magnetic conduction devices and stepping motor, wherein:
Said mould comprises core rod, former and die sleeve, and said former suit is arranged on outside the said core rod, and form to place the groove of magnetic, said die sleeve suit is arranged on outside the said former, and said die sleeve and said former closely cooperate;
Said two magnetic conduction devices are arranged on outside the said die sleeve, and the angle between said two magnetic conduction devices equals the angle of a pair of magnetic pole in the multipole orientation annular magnetic, and said stepping motor is connected with said two magnetic conduction devices or said mould.
8. device according to claim 7 is characterized in that said core rod is prepared from permeability magnetic material; Said former and die sleeve are prepared from non-magnet material.
9. device according to claim 8 is characterized in that, said core rod, former and die sleeve are to be provided with one heart.
10. according to the arbitrary described device of claim 7～9, it is characterized in that said device also comprises chuck, said chuck is fixed on the outer radius of said die sleeve.
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| CN103123864B (en) * | 2013-02-26 | 2016-01-06 | 江苏东瑞磁材科技有限公司 | A kind of method and manufacturing installation thereof preparing radial permanent magnetic ring |
| CN105304263A (en) * | 2015-10-16 | 2016-02-03 | 宁波鑫丰磁业有限公司 | One-step molding halbach array permanent magnet radial ring |
| CN106057397A (en) * | 2016-07-20 | 2016-10-26 | 长兴荣兴电子有限公司 | Multi-polar magnetic ring |
| CN106057398A (en) * | 2016-07-20 | 2016-10-26 | 长兴荣兴电子有限公司 | Multi-polar magnetic ring |
| CN106057397B (en) * | 2016-07-20 | 2019-02-01 | 浙江品创知识产权服务有限公司 | Multi-pole magnet-ring |
| CN112912748A (en) * | 2018-09-03 | 2021-06-04 | 新加坡科技设计大学 | Permanent magnet system and method of forming the same |
| CN110165847A (en) * | 2019-06-11 | 2019-08-23 | 深圳市瑞达美磁业有限公司 | The production method of the solid magnet of radial anisotropic multipole of different in width waveform |
| US11183908B2 (en) | 2019-06-11 | 2021-11-23 | Shenzhen Radimag Magnets Co., Ltd | Method for producing radially anisotropic multipolar solid magnet adapted to different waveform widths |
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| CN102456463B (en) | 2016-08-10 |
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