CN1949406A - Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof - Google Patents
Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof Download PDFInfo
- Publication number
- CN1949406A CN1949406A CN 200510021834 CN200510021834A CN1949406A CN 1949406 A CN1949406 A CN 1949406A CN 200510021834 CN200510021834 CN 200510021834 CN 200510021834 A CN200510021834 A CN 200510021834A CN 1949406 A CN1949406 A CN 1949406A
- Authority
- CN
- China
- Prior art keywords
- powder
- magnetic
- permeability
- composite
- soft magnetic
- 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.)
- Pending
Links
Images
Abstract
The invention relates to a dynamo using slot wedge using compound soft magnetic powder magnetic conductance material. The powder is the compound soft magnetic powder compounded from MnZn ferrite powder and reduced iron powder or carbonyl iron dust. The radio is 10-90wt% high resistivity magnetic powder, and 10-90wt% high magnetic permeability magnetic powder. Adding certain quantity glass fiber into compounded magnetic powder layer, separating structure would be formed. The invention could decrease supplementary load loss of dynamo, as well as eddy current loss, and improve efficiency of dynamo.
Description
Technical field
The invention belongs to the soft magnetic material field, particularly a kind of composite soft magnetic powder magnetic conducting material for slot wedge of electric machine.
Background technology
As everyone knows, the total losses of motor are made up of copper loss, iron loss, mechanical loss and supplementary load loss etc.Wherein, iron loss mainly is made up of magnetic hysteresis loss and eddy current loss, and supplementary load loss are made up of pulsation loss and surface loss.At present, the mechanism of motor development both at home and abroad all sets about from electric machine structure and motor material aspect, seeks and reduces the loss of electric machine, improves the method for electric efficiency.Angle from motor material, effective method is to adopt the magnetic slot-seal of permeability magnetic material preparation to replace insulation slot wedge in the original motor stator teeth groove structure the most, the pulsating amplitude of the magnetic flux density of rotor tooth surface when utilizing the magnetic conduction of magnetic slot-seal to be used for reducing the motor operation, make magnetic flux distribution be tending towards even, and then the pulsation loss and the surface loss of minimizing motor, improve efficiency of motor.
Magnetoconductivity material in use for slot wedge of motor has steel wire pulling permeability magnetic material, magnetic slot mud and mold pressing permeability magnetic material etc. at present.Steel wire pulling permeability magnetic material is because processing difficulties, is prone to during military service that steel wire comes off and accidents caused, now is eliminated.Magnetic slot mud be with the magnetic conduction powder with make plasticity mud shape thing after epoxy resin mixes, as the FM of the Fuji series of Japan, the Protofer series of Siemens etc.The mold pressing permeability magnetic material is to obtain through hot-press solidifying in pressing mold after the material mixing such as magnetic conduction powder and epoxy resin, glass fibre and curing agent, as the MC mold pressing magnetic slot-seal of Xiangtan Electrical Machinery Plant, the MCR magnetic slot-seal of Yixing magnetic wedge factory etc., its structure as shown in Figure 1.The performance of two class permeability magnetic materials is as shown in table 1.Hence one can see that, and the relative permeability of this two classes permeability magnetic material is higher, but mechanical property and insulation property are all very low.This is because iron content is higher in this two classes permeability magnetic material, so relative permeability is higher.Do not have fortifying fibre in the magnetic slot mud, material only depends on wherein low amounts of resin curing to bear external force afterwards; And the glass fibre amount in the mold pressing permeability magnetic material seldom, and all concentrate on material surface, also holds and can't stand too big external force, so this two classes permeability magnetic material mechanical property is lower.The magnetic conduction powder that uses in this two classes permeability magnetic material all is the Fe powder, and resistance is very low, only has about 0.25 Ω, so these two classes permeability magnetic material insulation property are also lower.Mechanical property is low to make this two classes permeability magnetic material processing difficulties, is applied to often occur coming off and cracking phenomena behind the motor, has greatly limited its application.Very low this two classes permeability magnetic material that makes of insulation property causes the eddy current loss of motor significantly to rise in motor application.Though the motor supplementary load loss reduce, efficient still has raising, and this is to be prerequisite with the eddy current loss of sacrificing motor.
Studies show that both at home and abroad the relative permeability of permeability magnetic material does not need too high, otherwise the starting torque of motor and breakdown torque decline to a great extent.The relative permeability of permeability magnetic material only needs just can effectively improve electric efficiency between 5～10.Thereby, can be from the component and the structure angle of permeability magnetic material, prepare existing certain magnetic property, also have than high insulating property, the permeability magnetic material that also has higher mechanical property simultaneously, not only can reduce the supplementary load loss of motor with the magnetic slot-seal of its preparation, can also reduce the eddy current loss of motor, further improve electric efficiency.
The performance of table 1 liang class permeability magnetic material
| Project | Magnetic slot mud | The mold pressing permeability magnetic material | ||
| Protofer-10 | FM-2 | MC-2 | MCR | |
| Normal temperature bending strength (MPa) normal temperature impact strength (kJ/m 2) specific volume resistance (Ω cm) relative permeability | 60-6.7 10 ((maximum relative permeabilities) | 56 - - 4.3(B＝0.5T) | 120 - - 6.5(B＝0.5T) | 150 56 6.15 7.7(B＝0.5T) |
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of composite soft magnetic powder magnetic permeability magnetic material and preparation method thereof is provided, the permeability magnetic material that obtains in this way promptly has certain magnetic property, also has certain insulation property, also has higher mechanical property simultaneously.Technical scheme of the present invention relates to the design of magnetic conduction powdery components and the permeability magnetic material structural design of permeability magnetic material, and concrete measure is as follows:
1, magnetic conduction powdery components design
Iron powder resistance in the permeability magnetic material commonly used is very low, and surface resistivity only has about 0.25 Ω; And iron powder forms conductive channel in permeability magnetic material, and then causes permeability magnetic material resistance very low.Prepare the higher permeability magnetic material of resistance, the most direct method is a Magnaglo of selecting for use resistivity higher.The most frequently used higher Magnaglo of resistivity is the MnZn soft magnetic ferrite at present, and its surface resistivity reaches about 25k Ω.Though the ferritic magnetic permeability of MnZn is higher, this is for ring-shaped sample fine and close behind the sintering.The preparation permeability magnetic material can't use hard ring-shaped sample, can only use the pre-imitation frosted glass behind the MnZn ferrite ball milling, and this pre-imitation frosted glass permeability is lower.Therefore, obtain having the magnetic conductive board of certain magnetic permeability, also need in the MnZn ferrite powder, add the higher relatively iron powder mixing of magnetic permeability and obtain composite soft magnetic powder magnetic.The MnZn ferrite powder that resistance is high is scattered in the iron powder, stops the conductive channel of iron powder to form, and makes composite soft magnetic powder magnetic both have certain magnetic property, also has certain insulation property.Iron content is high more in the composite powder, and magnetic property is high more; MnZn ferrite content is high more, and resistivity is high more.
2, the structural design of permeability magnetic material
The very low structure with material of magnetic slot mud and mold pressing permeability magnetic material mechanical property and insulation property also has much relations.In order to guarantee the mechanical property of permeability magnetic material, must add a certain amount of fortifying fibre.The reinforcing glass fiber adds with the form of glass cloth usually.But glass cloth can not only be distributed in material surface as the mold pressing permeability magnetic material, otherwise crackle is easy to produce and unstable propagation at the iron powder layer under the external force effect.If glass cloth is evenly dispersed in the magnetic blow out coating, obtain structure as shown in Figure 2, then magnetic blow out coating becomes many independently magnetic blow out coating that separated by glass cloth each other.After even crackle produces in certain magnetic blow out coating like this, because the obstruct of glass cloth, crackle also is difficult for to adjacent magnetic blow out coating expansion.And in the composite material, the interface enhancement effect also has a significant impact its mechanical property.The interface fiber number of plies is many more, and interfacial effect is strong more.Thereby the mechanical property of this structure permeability magnetic material is higher.
Glass fibre not only has higher mechanical property, and self also has very high insulation property.In structure shown in Figure 2, fibrage cuts off magnetic blow out coating each other, is not easy between the magnetic blow out coating to be connected with each other, and the conductive channel between the magnetic is difficult to form, and this has also improved the insulation property of permeability magnetic material greatly.And epoxy resin can all be immersed on the glass cloth.During hot pressing, flow to magnetic blow out coating after the epoxy resin fusion on the glass cloth, magnetic is coated.Behind the epoxy resin cure, the epoxy resin with insulation is continuous each other between the magnetic, and this not only helps improving the mechanical property of material, has also hindered the formation of conductive channel between the conductive powder, helps the raising of material insulation property.
The invention has the beneficial effects as follows: added the higher MnZn ferrite powder of resistivity in the iron powder in permeability magnetic material, and adopted glass layer to cut apart the structure of composite magnetic powder layer, the permeability magnetic material that obtains had so both had certain relative permeability, also have higher insulation property, also have higher mechanical property simultaneously.After being applied to motor with the magnetic slot-seal of its preparation, not only can reduce the supplementary load loss of motor, can also reduce the eddy current loss of motor, improve efficiency of motor.
Description of drawings
Fig. 1 is the structure chart of mold pressing permeability magnetic material;
Fig. 2 is the structure chart of soft magnetic composite powder permeability magnetic material;
Embodiment
Embodiment 1
Present embodiment is made the permeability magnetic material of carbonyl iron dust/MnZn ferrite soft magnetic composite powder preparation, and processing step is as follows:
(1) batching: glass fibre 30%; Soft magnetic composite powder 20% (MnZn ferrite powder: Fe powder=4: 1); Epoxy resin 50%.Above percentage is percent by volume.Glass fibre adds with the form of glass cloth, and resin all is immersed on the glass cloth.
(2) lamination: by glass fabric layer number average branch, the composite powder that will divide equally places and obtains pre-binder on the glass cloth then with the composite soft magnetic powder magnetic that mixes.Precompressed bed of material ply obtains structure as shown in Figure 2.
(3) hot pressing: the pre-binder behind the lamination is put into template carry out hot pressing, allow resin melt-flow bonding composite magnetic powder and fiber.Hot pressing temperature is the epoxy resin cure temperature, and hot pressing pressure is 10MPa.Hot pressing time is 120Min.The pressurize cooling obtains the soft magnetic composite powder permeability magnetic material.
The magnetic conduction composite material that makes is tested mechanical property according to the method for GB/T5130-1985, according to the method test relative permeability of GB/T3657-1983, according to the method test insulation property of GB/T5130-1997.The performance of test is as follows:
Maximum relative permeability is 5.3; The normal temperature bending strength is 423MPa; Impact strength is 92.6kJ/m
2Specific volume resistance is 3.6 * 10
9Ω cm; Puncture voltage is 9.2kV/mm.Hence one can see that, and the relative permeability of soft magnetic composite powder permeability magnetic material reaches requirement, and mechanical property and insulation property improve a lot.
Embodiment 2
Present embodiment is made the permeability magnetic material of FeSiAl/MnZn ferrite soft magnetic composite powder preparation, and processing step is as follows:
(1) batching: glass fibre 25%; Soft magnetic composite powder 25% (MnZn ferrite powder: FeSiAl powder=3: 2); Epoxy resin 50%.Above percentage is percent by volume.Glass fibre adds with the form of glass cloth, and resin all is immersed on the glass cloth.
(2) lamination: by glass fabric layer number average branch, the composite powder that will divide equally places and obtains pre-binder on the glass cloth then with the composite soft magnetic powder magnetic that mixes.Precompressed bed of material ply obtains structure as shown in Figure 2.
(3) hot pressing: the pre-binder behind the lamination is put into template carry out hot pressing, allow resin melt-flow bonding composite magnetic powder and fiber.Hot pressing temperature is the epoxy resin cure temperature, and hot pressing pressure is 8MPa.Hot pressing time is 150Min.The pressurize cooling obtains the soft magnetic composite powder permeability magnetic material.
The magnetic conduction composite material that makes is tested mechanical property according to the method for GB/T5130-1985, according to the method test relative permeability of GB/T3657-1983, according to the method test insulation property of GB/T5130-1997.The performance of test is as follows:
Maximum relative permeability is 5.5; The normal temperature bending strength is 404MPa; Impact strength is 101kJ/m
2Specific volume resistance is 9.4 * 10
7Ω cm; Puncture voltage is 3.1kV/mm.Hence one can see that, and the relative permeability of soft magnetic composite powder permeability magnetic material increases to some extent, and mechanical property and insulation property are higher.But the increase of the soft magnetic powder content that resistivity is low makes the decreasing insulating of permeability magnetic material.
Embodiment 3
Present embodiment is made the permeability magnetic material of reduced iron powder/MnZn ferrite soft magnetic composite powder preparation, and processing step is as follows:
(1) batching: glass fibre 20%; Soft magnetic composite powder 20% (MnZn ferrite powder: reduction Fe powder=1: 4); Epoxy resin 60%.Above percentage is percent by volume.Glass fibre adds with the form of glass cloth, and resin all is immersed on the glass cloth.
(2) lamination: by glass fabric layer number average branch, the composite powder that will divide equally places and obtains pre-binder on the glass cloth then with the composite soft magnetic powder magnetic that mixes.Precompressed bed of material ply obtains structure as shown in Figure 2.
(3) hot pressing: the pre-binder behind the lamination is put into template carry out hot pressing, allow resin melt-flow bonding composite magnetic powder and fiber.Hot pressing temperature is the epoxy resin cure temperature, and hot pressing pressure is 6MPa.Hot pressing time is 120Min.The pressurize cooling obtains the soft magnetic composite powder permeability magnetic material.The magnetic conduction composite material that makes is tested mechanical property according to the method for GB/T5130-1985, according to the method test relative permeability of GB/T3657-1983, according to the method test insulation property of GB/T5130-1997.The performance of test is as follows:
Maximum relative permeability is 6.5; The normal temperature bending strength is 421MPa; Impact strength is 120kJ/m2; Specific volume resistance is 2.5 * 106 Ω cm; Puncture voltage is 1.0kV/mm.Hence one can see that, and the relative permeability of soft magnetic composite powder permeability magnetic material continues to increase, and mechanical property and insulation property are higher.But the increase of the soft magnetic powder content that resistivity is low makes the insulation property of permeability magnetic material continue to descend.
Claims (5)
1, a kind of magnetoconductivity material in use for slot wedge of motor, it is characterized in that permeability magnetic material is made up of thermosetting epoxy resin, glass fabric and Magnaglo, the percent by volume of Magnaglo is between 20%～40%, the percent by volume of glass fibre is between 15%～30%, and the percent by volume of epoxy resin is between 40%～60%.
2, Magnaglo according to claim 1 is characterized in that Magnaglo is a composite soft magnetic powder magnetic.A kind of in the composite soft magnetic powder magnetic is the higher MnZn ferrite powder of resistivity, and another kind is a relative permeability higher metal soft magnetic powder, a kind of as in the powder such as reduced iron powder, carbonyl iron dust, FeSiAl.
3, according to claim 1 and 2 described Magnaglos, it is characterized in that high-resistance MnZn ferrite powder percent by volume between 10%～95%, the soft magnetic metal powder volume percentage of high magnetic permeability is between 10%～95%.
4, according to claim 1,2 and 3 described permeability magnetic materials, it is characterized in that glass fabric is dispersed in the composite magnetic powder in the material, form composite magnetic powder by the separate structure of glass fabric of certain number of plies, hinder the low powder of resistivity and in material, form conductive channel.
5, according to claim 1,2 and 3 described permeability magnetic materials, when it is characterized in that preparing material, make the epoxy resin fusion, coat composite magnetic powder and glass fabric by hot pressing.Hot pressing temperature is the epoxy resin cure temperature, and hot pressing pressure is 6～10MPa.Hot pressing time is 120～150Min.The pressurize cooling obtains permeability magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510021834 CN1949406A (en) | 2005-10-10 | 2005-10-10 | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510021834 CN1949406A (en) | 2005-10-10 | 2005-10-10 | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1949406A true CN1949406A (en) | 2007-04-18 |
Family
ID=38018883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510021834 Pending CN1949406A (en) | 2005-10-10 | 2005-10-10 | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1949406A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552506B (en) * | 2009-05-14 | 2011-06-15 | 嘉兴市新大陆机电有限公司 | Bidirectional glass fiber drawing slot wedge and production method thereof |
| CN102218861A (en) * | 2011-03-11 | 2011-10-19 | 西安市美联电气绝缘有限公司 | Double high laminated concentrating flux plate and preparation method thereof |
| CN102255442A (en) * | 2011-07-18 | 2011-11-23 | 上海动能重工制造有限公司 | Magnetic slot wedge and preparation process and application thereof |
| CN102780297A (en) * | 2012-08-13 | 2012-11-14 | 苏州巨峰电气绝缘系统股份有限公司 | Self-adaptive magnetic-conducting slot wedge and preparation method thereof |
| CN107659020A (en) * | 2017-10-31 | 2018-02-02 | 哈尔滨电机厂有限责任公司 | Steam turbine generator magnetic slot-seal |
| CN107681796A (en) * | 2017-10-31 | 2018-02-09 | 哈尔滨电机厂有限责任公司 | Combining structure stator inner surface structure |
| CN107689701A (en) * | 2017-10-31 | 2018-02-13 | 哈尔滨电机厂有限责任公司 | There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal |
| CN107786046A (en) * | 2017-10-31 | 2018-03-09 | 哈尔滨电机厂有限责任公司 | Magnetic slot-seal manufacture method |
| CN108418325A (en) * | 2018-03-09 | 2018-08-17 | 沈阳工业大学 | A kind of high-speed motor of novel integrated permanent magnet rotor structure |
| CN103368325B (en) * | 2012-04-03 | 2018-09-07 | 波音公司 | Flexible magnet orients reinforcement method |
| CN108781015A (en) * | 2016-03-25 | 2018-11-09 | 三菱电机株式会社 | Armature for electric rotating machine |
| CN109285650A (en) * | 2018-10-30 | 2019-01-29 | 钢铁研究总院 | A kind of low eddy-current loss sintered rare-earth permanent magnetic body and preparation method thereof |
| CN111594481A (en) * | 2020-05-28 | 2020-08-28 | 沈阳工业大学 | Low-eddy-loss high-efficiency magnetic pump |
| CN113450988A (en) * | 2021-05-18 | 2021-09-28 | 李想 | High-permeability soft magnetic powder raw material lamination processing method for inductor |
| CN114070006A (en) * | 2021-11-10 | 2022-02-18 | 中国航发北京航空材料研究院 | Method for preparing magnetic gear modulation ring |
-
2005
- 2005-10-10 CN CN 200510021834 patent/CN1949406A/en active Pending
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552506B (en) * | 2009-05-14 | 2011-06-15 | 嘉兴市新大陆机电有限公司 | Bidirectional glass fiber drawing slot wedge and production method thereof |
| CN102218861A (en) * | 2011-03-11 | 2011-10-19 | 西安市美联电气绝缘有限公司 | Double high laminated concentrating flux plate and preparation method thereof |
| CN102218861B (en) * | 2011-03-11 | 2014-04-16 | 杨联社 | Double high laminated concentrating flux plate and preparation method thereof |
| CN102255442A (en) * | 2011-07-18 | 2011-11-23 | 上海动能重工制造有限公司 | Magnetic slot wedge and preparation process and application thereof |
| CN103368325B (en) * | 2012-04-03 | 2018-09-07 | 波音公司 | Flexible magnet orients reinforcement method |
| CN102780297A (en) * | 2012-08-13 | 2012-11-14 | 苏州巨峰电气绝缘系统股份有限公司 | Self-adaptive magnetic-conducting slot wedge and preparation method thereof |
| CN108781015B (en) * | 2016-03-25 | 2020-08-25 | 三菱电机株式会社 | Armature for rotating electrical machine |
| CN108781015A (en) * | 2016-03-25 | 2018-11-09 | 三菱电机株式会社 | Armature for electric rotating machine |
| CN107786046A (en) * | 2017-10-31 | 2018-03-09 | 哈尔滨电机厂有限责任公司 | Magnetic slot-seal manufacture method |
| CN107689701A (en) * | 2017-10-31 | 2018-02-13 | 哈尔滨电机厂有限责任公司 | There is grain-oriented Si steel sheet magnetic conduction sheet magnetic slot-seal |
| CN107681796A (en) * | 2017-10-31 | 2018-02-09 | 哈尔滨电机厂有限责任公司 | Combining structure stator inner surface structure |
| CN107659020A (en) * | 2017-10-31 | 2018-02-02 | 哈尔滨电机厂有限责任公司 | Steam turbine generator magnetic slot-seal |
| CN108418325A (en) * | 2018-03-09 | 2018-08-17 | 沈阳工业大学 | A kind of high-speed motor of novel integrated permanent magnet rotor structure |
| CN108418325B (en) * | 2018-03-09 | 2023-10-27 | 沈阳工业大学 | Novel high-speed motor with integral permanent magnet rotor structure |
| CN109285650A (en) * | 2018-10-30 | 2019-01-29 | 钢铁研究总院 | A kind of low eddy-current loss sintered rare-earth permanent magnetic body and preparation method thereof |
| CN111594481A (en) * | 2020-05-28 | 2020-08-28 | 沈阳工业大学 | Low-eddy-loss high-efficiency magnetic pump |
| CN113450988A (en) * | 2021-05-18 | 2021-09-28 | 李想 | High-permeability soft magnetic powder raw material lamination processing method for inductor |
| CN113450988B (en) * | 2021-05-18 | 2023-07-21 | 深圳市华控科技集团有限公司 | Soft magnetic powder raw material lamination treatment method for high-permeability inductor |
| CN114070006A (en) * | 2021-11-10 | 2022-02-18 | 中国航发北京航空材料研究院 | Method for preparing magnetic gear modulation ring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1949406A (en) | Composite soft magnetic powder magnetic conducting material for slot wedge of electric machine and preparation thereof | |
| CN1285083C (en) | Flexible binding neodymium ferroboron magnet and manufacturing method thereof | |
| JP3390760B2 (en) | Method of manufacturing multilayer brush and brush manufactured by the method | |
| CN1700368A (en) | Soft-magnetic composite material and process for making magnetic conduction component by using same | |
| CN101211677A (en) | Single-side reinforced small amount epoxy glue mica tape and method of manufacture and its uses | |
| CN1506983A (en) | Composite magnetic material, magnetic core and magnetic element using the same composite magnetic element | |
| CN104332263A (en) | Sintering type rare earth permanent magnet capable of reducing eddy-current loss and manufacturing method thereof | |
| CN103440955A (en) | Compound agglutinated rear earth permanent magnet and preparation method thereof | |
| CN102169744A (en) | Laminated magnetic conducting plate and manufacturing method thereof | |
| KR102454806B1 (en) | Anisotropic bonded magnet and preparation method thereof | |
| CN101667481A (en) | Silicon-iron soft magnetic composite material | |
| CN1719635A (en) | 1-3 structure huge magnetoelectric material and preparing process thereof | |
| Kordecki et al. | Development and applications of soft magnetic PM materials | |
| CN111943660B (en) | Strontium permanent magnetic ferrite, preparation method and dispersing agent used by preparation method | |
| CN102969111B (en) | Low-cost high-resistivity cerium magnet and preparation method thereof | |
| CN1867243A (en) | Novel electromagnetic shielding composite material and its preparing method | |
| CN1594209A (en) | Flexible rare-earth bonded magnet and its manufacturing method | |
| WO2007036505A1 (en) | Rotary electric motor | |
| CN101034608A (en) | Compound rare earth permanent-magnetic material with insulated high magnetic performance | |
| CN1213876A (en) | Brush for electromachine and its prodn. method | |
| CN101114751A (en) | Electrical brush | |
| CN2911899Y (en) | Combined parallel wire | |
| CN1700366A (en) | Soft-magnetic composite material for magnetic conduction component and process for preparing magnetic conduction component | |
| CN111943640A (en) | Efficient preparation method of self-heating nano building material | |
| CN109285650A (en) | A kind of low eddy-current loss sintered rare-earth permanent magnetic body and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |