CN103986248A - Rare earth ring magnet having means for receiving foreign particles - Google Patents
Rare earth ring magnet having means for receiving foreign particles Download PDFInfo
- Publication number
- CN103986248A CN103986248A CN201410047406.5A CN201410047406A CN103986248A CN 103986248 A CN103986248 A CN 103986248A CN 201410047406 A CN201410047406 A CN 201410047406A CN 103986248 A CN103986248 A CN 103986248A
- Authority
- CN
- China
- Prior art keywords
- annular magnet
- utensil
- suo shu
- aforementioned
- utmost point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002245 particle Substances 0.000 title claims abstract description 20
- 150000002910 rare earth metals Chemical group 0.000 title claims abstract description 11
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims description 17
- 230000005291 magnetic effect Effects 0.000 claims description 17
- 230000005611 electricity Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 230000004323 axial length Effects 0.000 claims description 4
- 230000008021 deposition Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/06—Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to a ring magnet. The ring magnet at least partially comprises a rare earth metal having a hollow cylindrical shape and extending in the axial direction, wherein the rare earth metal has an inner surface on which a means for receiving foreign particles is arranged. The invention further relates to a method for manufacturing the ring magnet.
Description
Technical field
The present invention relates to a kind of annular magnet, it is the open tubular column bodily form and constructs, and comprise at least in part a rare earth metal along extending axially, and the invention still further relates to a kind of method for the manufacture of this annular magnet.
Background technology
The machine of electricity is for example that electro-motor, starter, generator or auxiliary drive are for example for the adjustment drive unit of motor vehicle.In these electric machines, known rotor or stator are designed with permanent magnet in order to produce permanent magnetic field.At this, in the category of the ultraminiaturization of described machine or in order to improve the exportable power of machine, usually use permanent magnet, they partly comprise rare earth metal.
For example known following rotor and stator, wherein, permanent magnet is along axially and radially extend in rotor or stator, and along being tangentially magnetized, or permanent magnet is along axially and tangentially extending in rotor or stator and along being radially magnetized.Use the permanent magnet of the ring segment-shaped or cuboid of circle, they are engaged with in the portion of leaving a blank of matrix and are fixed afterwards for this reason.In these rotors or stator, spot particle and impurity particle, for example metal fillings can be by the processing of ferromagnetic material, peel off etc., are transmitted until under the gap forming by the place of leaving a blank in matrix and there deposition at the machine run duration of described electricity by the rotation of rotor.
Known also have, and uses annular magnet, and they are along extending axially, open tubular column bodily form ground structure and along being radially magnetized.This annular magnet has the contrary magnetized area of alternation, and these regions form the arctic of magnetic or the South Pole of magnetic.The shortcoming of these annular magnets is, impurity particle, especially magnetic-particle can the air gap between rotor and stator under deposition.Owing to air gap being selected as far as possible littlely in order to realize large as far as possible machine power, therefore this impurity particle can cause friction and therefore cause power loss, and causes at the operating noise of electric machine.
Summary of the invention
Therefore task of the present invention is, proposes a kind of electric machine with annular magnet, and wherein, impurity particle causes the danger of friction and noise to be reduced or not exist in air gap.
This task utilizes a kind of annular magnet to solve, its be the open tubular column bodily form construct and with one heart around an axis along extending axially, and comprise at least in part a rare earth metal, wherein, this rare earth metal has a surface, arranges one for holding the utensil of impurity particle on this surface.This utensil can be realized the deposition of the big or small impurity particle of definition and therefore play the effect of material subsidence part.The impurity particle that also diameter can be greater than thus to width of air gap is received in this utensil.
Preferably, described rare earth metal is neodymium, and wherein, described annular magnet is neodymium-iron-boron magnet.But the invention is not restricted to this execution mode of annular magnet, but also can use other annular magnet, especially other rare earth metal.
This utensil is a groove or groove preferably.Particularly preferably, it extends on the whole axial length of described annular magnet.Therefore, in the time of rotor, in air gap, deposit and cause friction impurity particle in the whole length of described annular magnet, detected by described utensil.But also can consider that in principle other depression is as utensil, for example oval or circular depression, or the model being formed by a large amount of especially straight utensils.
This utensil is preferably as the crow flies along extending axially, or extends as the crow flies with axially at angle, or arc ground is along extending axially.Described utensil with axially at angle or arc be that impurity particle not only deposits in described utensil, and along described utensil from wherein being transported towards the advantage of axial arrangement.
Preferably, the degree of depth of described groove has being less than 20%, being particularly preferably less than 10% of wall thickness of described annular magnet.Maintain thus the stability of described annular magnet.
Described surface is the surface of the described annular magnet of a restriction.One preferred embodiment in, described surface is the inner surface towards axis of described annular magnet.Equally preferably, it is the outer surface of the away from axis of described annular magnet.
In addition preferred a kind of annular magnet, it has the utmost point transitional region between a magnetic north and a magnetic south, and wherein, described arrangement of implement is in a utmost point transitional region, thus it does not affect magnetic flux density.Particularly preferably, described annular magnet has multiple utmost point transitional regions, wherein, draws a utensil of system in each utmost point transitional region.Impurity particle is detected by described utensil as far as possible rapidly thus.
Described annular magnet preferably plastics combinations or resin-bonded.One preferred embodiment in, its be single type form.One equally preferred embodiment in, described utmost point transitional region is formed by the material of the non-conduction of a magnetic, especially plastics.
Described task also utilizes a rotor for electro-motor or stator to solve, and it has a kind of such annular magnet.Described task also utilizes a kind of machine of electricity, especially electro-motor to solve, and this electro-motor has a kind of such rotor or stator.Because described annular magnet comprises described utensil, therefore the impurity particle in the air gap between described stator and rotor deposits in described utensil, thereby it can not cause friction between stator and rotor and the operating noise of machine at described electricity.
Described task also utilizes a kind of adjustment drive unit for motor to solve, and this motor has a kind of so electric machine.But the machine of described electricity also can be for other electrical equipment, for example, for hand held power machine.
Described task also utilizes a kind of method for the manufacture of annular magnet to solve, wherein, described utensil during the described annular magnet of extruding or the system of being drawn afterwards to wherein.The system of drawing for described utensil during the described annular magnet of extruding, preferably, suitable with the shape of compression tool.But for fear of manufacturing new compression tool, it is also preferred that, described utensil is only just drawn system in described annular magnet after extruding.
Preferably, described annular magnet is just coated after drawing the described utensil of system, thereby makes it prevent reliably corrosion.In addition avoided thus the transition of sharp-pointed arris.But the one of the described annular magnet not cated execution mode of tool is also preferred.
Brief description of the drawings
The present invention is described with reference to the accompanying drawings.Accompanying drawing is only exemplary and does not limit total inventive concept.
Fig. 1 show one through according to the cross section of annular magnet of the present invention and
Fig. 2 shows respectively according to the three-dimensional view of the different execution mode of annular magnet of the present invention at (a) with (b).
Embodiment
The annular magnet 1 of Fig. 1 be the open tubular column bodily form construct and with one heart around an axis 2 along axial 21 extend.It has four magnetic pole N, S, draws respectively system one utmost point transitional region 14 between them.Described magnetic pole N, S are alternately oppositely magnetized mutually, thereby a magnetic north N and a magnetic south S are alternately.They are arranged mutually with the spacing being equal to, thereby described utmost point transitional region 14 is also arranged equally mutually.
Described annular magnet 1 has its surface 12 of a restriction, and wherein, the surface 12 of away from axis is known as outer surface 121 hereinafter, and is known as hereinafter inner surface 120 towards the surface 12 of axis.
In described utmost point transitional region 14, on described inner surface 120, draw utensil 11 processed, they are provided for holding impurity particle (not shown).Therefore described utensil 11 is formed for the subsidence part of impurity particle.They are also configured at this groove extending along axial 21.Described groove has the profile of u shape.But it can be also v shape, rounding or other profile.Synonymously use concept utensil 11 and groove below.
Described utensil 11 has the profile 111 of u shape in the situation that of this annular magnet 1.But can be also other profile 111, for example v shape or circular profile (not shown).Importantly, the degree of depth 115 of described utensil 11 is less than the wall thickness 15 of described annular magnet 1, uses so that the stability of described annular magnet 1 can not be subject to the impact of described one or more utensil 11 significantly.
In an illustrated embodiment, described annular magnet 1 be single type form.In described utmost point transitional region 14, it is by making as the same magnetic material in the region of magnetic pole N, S.But following annular magnet 1 is also preferred, they are made up of material, for example plastics of another kind of material, the preferably non-conduction of magnetic in described utmost point transitional region 14.If described utmost point transitional region 14 is made up of another kind of material, its manufacture by plastics due to the characteristic of the non-conduction of its magnetic with respect to the manufacture by metal more preferably.
Shown in Fig. 1 in the inner chamber of described annular magnet 1 the machine part 31 of arranging interiorly of the machine 3 of a schematically shown in broken lines electricity, thereby described annular magnet 1 shows the outer part 32 of the machine 3 of described electricity.Between described interior part 31 and described outer part 32, draw an air gap 33.Inessential, the interior part 21 with described annular magnet 1 of the machine 3 of described electricity or outer part 32 are stator, the i.e. standing part of the machine 3 of described electricity, or rotor, the i.e. rotating part of the machine 3 of described electricity.Therefore the present invention not only can also use on rotary body outside on inner rotary body machine.
Because described utensil 11 is provided for holding the impurity particle in described air gap 33, therefore described utensil draw built in described annular magnet 1 on the side of described air gap 33.The annular magnet 1 here has described utensil 11 on surface 120 therein, thereby described annular magnet is provided for the outer part 32 of the machine 3 of an electricity.At this preferably, described outer part 32 forms described stator (inner rotary body).But this annular magnet also can use for a rotor (outward turning is turned) in principle.
Also be preferred but have the annular magnet 1 that is arranged in the utensil 11 on its outer surface 121, described utensil is provided for the interior part 32 of the machine 3 of an electricity, is preferred for rotor (inner rotary body).But this annular magnet also can use for a stator (outward turning is turned) in principle.
Also extend with one heart open tubular column bodily form ground structure and there is described utensil 11 on their inner surface 120 around axis 2 at two annular magnets 1 shown in Fig. 2.But their mutual differences are the arrangement of described utensil 120.
Exactly, the utensil 11 of the annular magnet 1 of Fig. 2 (a) as the crow flies along axial 21 and on the whole axial length 13 of described annular magnet 1 extend.The utensil 11 of the annular magnet 1 of Fig. 2 (b) equally as the crow flies but with axial 21 extend at angle.Have the following advantages with axial 21 arrangement tools at angle, impurity particle not only can deposit in described utensil 11, and can from described utensil 11, be transported.
Claims (15)
1. annular magnet (1), its be the open tubular column bodily form construct and extend around an axis (2) along axially (21) with one heart, and comprise at least in part a rare earth metal, wherein, described rare earth metal has a surface (12), it is characterized in that, on its surface (12), arrange one for holding the utensil (11) of impurity particle.
2. according to annular magnet claimed in claim 1 (1), it is characterized in that, described utensil (11) is groove or groove.
3. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described annular magnet has an axial length (13), and wherein, described utensil (11) is in the upper extension of whole axial length (13).
4. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described utensil (11) extends along axially (21) as the crow flies, or extends at angle with axially (21) as the crow flies (), or arc ground extends along axially (21).
5. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described surface (12) are the inner surface towards axis (120) of described annular magnet (1) or the outer surface (121) of away from axis.
6. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described annular magnet has the utmost point transitional region (14) between a magnetic north (N) and a magnetic south (S), and wherein, described utensil (11) is arranged in a utmost point transitional region (14).
7. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described annular magnet has multiple utensils (11), wherein, arranges a utensil (11) in each utmost point transitional region (14).
8. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described annular magnet is annular magnet plastics combination or resin-bonded (1).
9. according to the annular magnet one of aforementioned claim Suo Shu (1), it is characterized in that, described annular magnet be single type form.
10. according to the annular magnet (1) one of claim 1-8 Suo Shu, it is characterized in that, described utmost point transitional region is formed by the material of the non-conduction of magnetic, especially plastics.
11. rotors for electro-motor or stator, have according to the annular magnet one of aforementioned claim Suo Shu (1).
The machine of 12. electricity, especially electro-motor, have according to the rotor described in claim 11 or stator.
The 13. adjustment drive units for motor vehicle, have one according to the electric machine described in claim 12.
14. methods for the manufacture of the annular magnet (1) according to one of claim 1-10 Suo Shu, is characterized in that, described utensil (11) during extruding described annular magnet (1) or the system of being drawn afterwards in described annular magnet.
15. in accordance with the method for claim 14, it is characterized in that, described annular magnet (1) draw system described utensil (11) coated afterwards.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013202190.9 | 2013-02-11 | ||
| DE201310202190 DE102013202190A1 (en) | 2013-02-11 | 2013-02-11 | Ring magnet for rotor of electrical machine of motor car, is formed as hollow cylindrical shape and is extended concentrically about axis in axial direction, and has groove for receiving dirt particles that is arranged on inner surface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103986248A true CN103986248A (en) | 2014-08-13 |
| CN103986248B CN103986248B (en) | 2018-08-07 |
Family
ID=51226252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410047406.5A Expired - Fee Related CN103986248B (en) | 2013-02-11 | 2014-02-11 | Rare earth element annular magnet with the utensil for receiving impurity particle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103986248B (en) |
| DE (1) | DE102013202190A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100170A (en) * | 2015-04-29 | 2016-11-09 | 罗伯特·博世有限公司 | There is the toroidal magnet of narrow orifice for accommodating foreign particle thing with, and the motor that comprises this toroidal magnet and for the method manufacturing this toroidal magnet |
| CN112436710A (en) * | 2020-11-06 | 2021-03-02 | 兰州空间技术物理研究所 | Rotor structure of cylindrical moving-magnet linear motor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015219075A1 (en) | 2015-10-02 | 2017-04-06 | Robert Bosch Gmbh | Electric machine, in particular permanently excited electrical machine, with an adhesive surface for adhering foreign particles |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3500090A (en) * | 1966-06-28 | 1970-03-10 | Max Baermann | Stator unit for an electrodynamic device |
| CN1083619A (en) * | 1992-03-18 | 1994-03-09 | 住友特殊金属株式会社 | The motor of the cylinder type ferrite magnet of radial anisotropic and manufacture method thereof and this magnet of use |
| CN1490923A (en) * | 2002-09-30 | 2004-04-21 | ������������ʽ���� | Commutator motor |
| JP2007215382A (en) * | 2006-02-13 | 2007-08-23 | Asmo Co Ltd | Motor |
| CN101404435A (en) * | 2008-07-11 | 2009-04-08 | 浙江大学 | Magnetic field speed reduction type low speed large torque moment permanent-magnet brushless DC motor |
| CN101777818A (en) * | 2009-01-09 | 2010-07-14 | 德昌电机(深圳)有限公司 | Permanent magnet motor |
-
2013
- 2013-02-11 DE DE201310202190 patent/DE102013202190A1/en not_active Withdrawn
-
2014
- 2014-02-11 CN CN201410047406.5A patent/CN103986248B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3500090A (en) * | 1966-06-28 | 1970-03-10 | Max Baermann | Stator unit for an electrodynamic device |
| CN1083619A (en) * | 1992-03-18 | 1994-03-09 | 住友特殊金属株式会社 | The motor of the cylinder type ferrite magnet of radial anisotropic and manufacture method thereof and this magnet of use |
| CN1490923A (en) * | 2002-09-30 | 2004-04-21 | ������������ʽ���� | Commutator motor |
| JP2007215382A (en) * | 2006-02-13 | 2007-08-23 | Asmo Co Ltd | Motor |
| CN101404435A (en) * | 2008-07-11 | 2009-04-08 | 浙江大学 | Magnetic field speed reduction type low speed large torque moment permanent-magnet brushless DC motor |
| CN101777818A (en) * | 2009-01-09 | 2010-07-14 | 德昌电机(深圳)有限公司 | Permanent magnet motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100170A (en) * | 2015-04-29 | 2016-11-09 | 罗伯特·博世有限公司 | There is the toroidal magnet of narrow orifice for accommodating foreign particle thing with, and the motor that comprises this toroidal magnet and for the method manufacturing this toroidal magnet |
| CN112436710A (en) * | 2020-11-06 | 2021-03-02 | 兰州空间技术物理研究所 | Rotor structure of cylindrical moving-magnet linear motor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102013202190A1 (en) | 2014-08-14 |
| CN103986248B (en) | 2018-08-07 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |