CN201745223U - Composite multi-layer NdFeB magnet - Google Patents
Composite multi-layer NdFeB magnet Download PDFInfo
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- CN201745223U CN201745223U CN2010202518050U CN201020251805U CN201745223U CN 201745223 U CN201745223 U CN 201745223U CN 2010202518050 U CN2010202518050 U CN 2010202518050U CN 201020251805 U CN201020251805 U CN 201020251805U CN 201745223 U CN201745223 U CN 201745223U
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- ndfeb magnet
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 26
- 230000010287 polarization Effects 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 124
- 239000010959 steel Substances 0.000 claims description 124
- 239000000853 adhesive Substances 0.000 claims description 12
- 230000001070 adhesive effect Effects 0.000 claims description 12
- 238000005194 fractionation Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 13
- 230000004907 flux Effects 0.000 description 11
- 230000002427 irreversible effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910052692 Dysprosium Inorganic materials 0.000 description 3
- 229910052771 Terbium Inorganic materials 0.000 description 3
- KBQHZAAAGSGFKK-UHFFFAOYSA-N dysprosium atom Chemical compound [Dy] KBQHZAAAGSGFKK-UHFFFAOYSA-N 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The utility model relates to a composite multi-layer NdFeB magnet having gradient coercivity. The utility model aims at providing a low-cost temperature-tolerant composite multi-layer NdFeB magnet. The composite multi-layer NdFeB magnet comprises at least two sheets of mono-component NdFeB magnets having different coercivity marks, wherein, one or two NdFeB magnet sheets have higher coercivity mark, at least one NdFeB magnet sheet has lower coercivity mark. The NdFeB magnet having higher coercivity mark is bound with the NdFeB magnet having lower coercivity mark via an insulated binding material along a direction of orientation, and located at the most lateral side of the composite multi-layer NdFeB magnet, the multi-layer NdFeB magnet is classified into seven levels, ranging from low coercivity N, medium coercivity M, special-high coercivity SH, ultra-high coercivity UH, extra-high coercivity EH to top-high coercivity TH, according to size of magnetic polarization intensity coercivity, and mark difference between the NdFeB magnet having higher coercivity mark and the NdFeB magnet having lower coercivity mark is one or two according to the coercivity size classification.
Description
Technical field
The utility model relates to a kind of Nd-Fe-Bo permanent magnet material, particularly relates to a kind of coercitive composite multi-layer Nd-Fe-B magnet steel of gradient that has.
Background technology
Nd-Fe-B magnet steel is the rare earth permanent-magnetic material based on intermetallic compound Re2Fe14B, has higher magnetic energy product and coercivity, and the advantage of high-energy-density makes Nd-Fe-B magnet steel obtain extensive use in modern industry and electronic technology.Along with the growing interest to global warming issue, the low-carbon economy epoch are coming, and fields such as wind-power electricity generation, hybrid vehicle will be developed fast, and Nd-Fe-B magnet steel is wherein important part.
Traditional Nd-Fe-B magnet steel is made up of the one pack system magnet steel, under the situation that motor runs up, has the big shortcoming of eddy current, and most of magnet steel has higher heatproof requirement when assembling or use, for improving the temperature tolerance of Nd-Fe-B magnet steel, usual way is the addition that increases heavy rare earth elements such as dysprosium, terbium, thereby improves the coercivity of Nd-Fe-B magnet steel.The shortcoming of this method is: improving the coercitive remanent magnetism that reduces magnet steel simultaneously, and the increase of dysprosium, terbium use amount will increase substantially the cost of raw material, and cause the waste of rare earth resources.
In general, the magnet steel top layer will be subjected to the effect of the opposing magnetic field stronger than magnet steel inside in magnetic circuit, and the magnet steel top layer is than the easier demagnetization in magnet steel inside in high-temperature work environment.If magnet steel is attached on the yoke of motor, the contact portion of magnet steel and yoke has formed the closed-loop path, is not easy demagnetization, and the suffered demagnetizing field of magnet steel outer surface wants big many.In addition in equipment runs up process, traditional bulk one pack system magnet steel is easy to produce eddy current under the electromagnetic induction effect because overall electrical resistance is less, influences the effective resistance increase on lower magnetic steel top layer simultaneously in Kelvin effect, cause the top layer heating, reduced the magnetic property of magnet steel.Under the acting in conjunction aspect above-mentioned two, magnet steel top layer working environment is more abominable than internal layer working environment, and the easier magnet loss phenomenon that occurs if therefore can improve the coercivity on magnet steel top layer, will promote the heat resistance of magnet steel so greatly.
The utility model content
The technical problems to be solved in the utility model provides the composite multi-layer Nd-Fe-B magnet steel that a kind of cost is low, heat resistance is good.
The utility model composite multi-layer Nd-Fe-B magnet steel, the one pack system Nd-Fe-B magnet steel that comprises at least two different coercivity trades mark, comprising the Nd-Fe-B magnet steel of a slice higher coercivity trade mark and at least a slice than the Nd-Fe-B magnet steel of the low-coercivity trade mark, the Nd-Fe-B magnet steel of the described higher coercivity trade mark along differently-oriented directivity by insulating adhesive with bond together than the Nd-Fe-B magnet steel of the low-coercivity trade mark, described Nd-Fe-B magnet steel is divided into low-coercivity N according to magnetic polarization intensity coercivity size, medium coercivity M, extra-high-speed coercivity SH, ultra-high coercive force UH, high coercivity EH, to high-coercive force TH totally seven class, the Nd-Fe-B magnet steel of the described higher coercivity trade mark differs one or two class with Nd-Fe-B magnet steel than the low-coercivity trade mark according to above-mentioned coercivity size fractionation.
The utility model composite multi-layer Nd-Fe-B magnet steel, wherein said some Nd-Fe-B magnet steels than the low-coercivity trade mark bond together by insulating adhesive along differently-oriented directivity.
The utility model composite multi-layer Nd-Fe-B magnet steel, the Nd-Fe-B magnet steel that wherein also comprises another sheet higher coercivity trade mark, the Nd-Fe-B magnet steel of described another sheet higher coercivity trade mark bonds together by insulating adhesive and outermost Nd-Fe-B magnet steel than the low-coercivity trade mark along differently-oriented directivity, and the Nd-Fe-B magnet steel of described another sheet higher coercivity trade mark differs one or two class with Nd-Fe-B magnet steel than the low-coercivity trade mark according to above-mentioned coercivity size fractionation.
The utility model composite multi-layer Nd-Fe-B magnet steel, the Nd-Fe-B magnet steel of wherein said two higher coercivity trades mark is identical.
The utility model composite multi-layer Nd-Fe-B magnet steel difference from prior art is that the utility model composite multi-layer Nd-Fe-B magnet steel combines with binding agent by the one pack system Nd-Fe-B magnet steel with at least two different coercivity trades mark, increased the resistance between magnet steel greatly, and eddy current is limited within the monolithic magnet steel, compare with the whole magnet steel of original bulk, the eddy current loss of this kind composite multi-layer Nd-Fe-B magnet steel reduces greatly.The outer high-coercive force magnet steel of composite multi-layer Nd-Fe-B magnet steel has higher heat resistance in addition, in high temperature installation and equipment operation process, can effectively resist the effect of high temperature and opposing magnetic field, thereby reduce the hot demagnetize of magnet steel, the working environment of internal layer magnet steel is improved, therefore internal layer can use the high remanent magnetism magnet steel of low-coercivity, so not only can reduce the use amount of heavy rare earth such as dysprosium, terbium, reduce material cost, reduce the wasting of resources, and can improve the whole remanent magnetism of compound magnet steel, and then can use the littler magnet steel of volume.This kind composite multi-layer Nd-Fe-B magnet steel has the characteristics of combined and instant in addition, can form the assembly of different sizes and size according to different user demands, has simplified production procedure greatly.
Below in conjunction with accompanying drawing composite multi-layer Nd-Fe-B magnet steel of the present utility model is described further.
Description of drawings
Fig. 1 is the structural representation of first kind of embodiment of the utility model composite multi-layer Nd-Fe-B magnet steel;
Fig. 2 is the structural representation of second kind of the utility model composite multi-layer Nd-Fe-B magnet steel and the third embodiment.
The specific embodiment
Embodiment 1
With composition is Nd
20Pr
6Dy
4.5Co
1Cu
0.15Al
0.2B
1Nb
0.2Fe
SurplusAnd Nd
20Pr
4Dy
6Co
1Cu
0.15Al
0.2B
1Nb
0.2Fe
SurplusRaw material make the 40UH magnet steel B that 42SH magnet steel A that coercivity is 21kOe and coercivity are 26kOe respectively, process following sample:
Sample 1: as shown in Figure 1, magnet steel A and B are processed into each 1 of the neodymium iron boron disk that is of a size of D10*1.2mm respectively, and use insulating adhesive that two magnet steel are combined along differently-oriented directivity, adhesive thickness is 0.02mm;
Sample 2: magnet steel A is processed into the neodymium iron boron disk that is of a size of D10*2.42mm;
Sample 3: magnet steel B is processed into the neodymium iron boron disk that is of a size of D10*2.42mm;
The irreversible experiment of magnet steel: under 20 ℃ of room temperatures, magnetize to sample is saturated, test experiments sample flux value, the iron plate that then sample is attached to 5mm thickness is gone up (sample 1 must partly being attached on the iron plate than low-coercivity magnet steel), put into high-temperature test chamber again and be heated to 150 ℃, be incubated 2 hours, take out then and be cooled to 20 ℃ and measure flux value, calculate the irreversible loss of sample.
Experimental result sees the following form:
| Sequence number | Type | The magnet steel trade mark | Magnet steel size (mm) | 20 ℃ of magnetic fluxs (mwb) | 150 ℃ of magnetic fluxs (mwb) | Irreversible loss |
| Sample 1 | Two-layer magnet steel | 40UH+42SH? | D10*2.42? | 0.200? | 0.196? | 2.0％? |
| Sample 2 | The individual layer magnet steel | 42SH? | D10*2.42? | 0.202? | 0.174? | 13.8％? |
| Sample 3 | The individual layer magnet steel | 40UH? | D10*2.42? | 0.198? | 0.194? | 2.0％? |
Embodiment 2
With composition is Nd
21Pr
6Dy
4Co
1Cu
0.15Al
0.5B
1Nb
0.2Fe
SurplusAnd Nd
20Pr
1Dy
9Co
2Cu
0.15Al
0.2B
1Nb
0.2Fe
SurplusRaw material make the 38EH magnet steel B that 38SH magnet steel A that coercivity is 24kOe and coercivity are 31kOe respectively, process following sample:
Sample 1: as shown in Figure 2, magnet steel A is processed into 1 of the neodymium iron boron disk that is of a size of D10*1.2mm, magnet steel B is processed into 2 of neodymium iron boron disks that are of a size of D10*1.2mm, and use insulating adhesive that 3 magnet steel are combined along differently-oriented directivity, wherein magnet steel A is in the centre position, and adhesive thickness is 0.01mm between two neodymium iron boron disks;
Sample 2: magnet steel A is processed into the neodymium iron boron disk that is of a size of D10*3.62;
Sample 3: magnet steel B is processed into the neodymium iron boron disk that is of a size of D10*3.62;
The irreversible experiment of magnet steel: under 20 ℃ of room temperatures, magnetize to sample is saturated, test experiments sample flux value, then sample is attached on the iron plate of 5mm thickness, put into high-temperature test chamber again and be heated to 180 ℃, be incubated 2 hours, take out then and be cooled to 20 ℃ and measure flux value, calculate the irreversible loss of sample.
Experimental result sees the following form:
Embodiment 3
With composition is Nd
20Pr
6Dy
4.5Co
1Cu
0.15Al
0.2B
1Nb
0.2Fe
SurplusAnd Nd
20Pr
1Dy
9Co
2Cu
0.15Al
0.2B
1Nb
0.2Fe
SurplusRaw material make the 38EH magnet steel B that 38SH magnet steel A that coercivity is 22kOe and coercivity are 31kOe respectively, process following sample:
Sample 1: as shown in Figure 2, magnet steel A is processed into 1 of the neodymium iron boron disk that is of a size of D10*1.2mm, magnet steel B is processed into 2 of neodymium iron boron disks that are of a size of D10*1.2mm, and use insulating adhesive that 3 magnet steel are combined along differently-oriented directivity, wherein magnet steel A is in the centre position, and adhesive thickness is 0.01mm between two neodymium iron boron disks;
Sample 2: magnet steel A is processed into the neodymium iron boron disk that is of a size of D10*3.62;
Sample 3: magnet steel B is processed into the neodymium iron boron disk that is of a size of D10*3.62;
The irreversible experiment of magnet steel: under 20 ℃ of room temperatures, magnetize to sample is saturated, test experiments sample flux value, then sample is attached on the iron plate of 5mm thickness, put into high-temperature test chamber again and be heated to 180 ℃, be incubated 2 hours, take out then and be cooled to 20 ℃ and measure flux value, calculate the irreversible loss of sample.
Experimental result sees the following form:
| Sequence number | Type | The magnet steel trade mark | Magnet steel size (mm) | 20 ℃ of magnetic fluxs (mwb) | 180 ℃ of magnetic fluxs (mwb) | Irreversible loss |
| Sample 1 | The multilayer magnet steel | 38EH+42SH+38EH? | D10*3.62? | 0.234? | 0.229? | 2.1％? |
| Sample 2 | The individual layer magnet steel | 42SH? | D10*3.62? | 0.249? | 0.217? | 12.9％? |
| Sample 3 | The individual layer magnet steel | 38EH? | D10*3.62? | 0.226? | 0.222? | 1.8％? |
More than irreversible experimental simulation magnet steel actual working environment, by contrast the foregoing description result, the utility model composite multi-layer Nd-Fe-B magnet steel (sample 1) is compared than low-coercivity magnet steel (sample 2) with corresponding one pack system as can be seen, temperature tolerance increases substantially, its temperature tolerance is suitable substantially with the temperature tolerance of corresponding one pack system higher coercivity magnet steel (sample 3), but the corresponding one pack system high-coercive force magnet steel of cost has significant reduction.In embodiment 3, the magnetic flux of composite multi-layer Nd-Fe-B magnet steel (sample 1) is significantly improved than corresponding individual layer high-coercive force magnet steel (sample 3) in addition.
Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection domain of the utility model claims.
Claims (4)
1. composite multi-layer Nd-Fe-B magnet steel, it is characterized in that: the one pack system Nd-Fe-B magnet steel that comprises at least two different coercivity trades mark, comprising the Nd-Fe-B magnet steel of a slice higher coercivity trade mark and at least a slice than the Nd-Fe-B magnet steel of the low-coercivity trade mark, the Nd-Fe-B magnet steel of the described higher coercivity trade mark along differently-oriented directivity by insulating adhesive with bond together than the Nd-Fe-B magnet steel of the low-coercivity trade mark, described Nd-Fe-B magnet steel is divided into low-coercivity N according to magnetic polarization intensity coercivity size, medium coercivity M, extra-high-speed coercivity SH, ultra-high coercive force UH, high coercivity EH, to high-coercive force TH totally seven class, the Nd-Fe-B magnet steel of the described higher coercivity trade mark differs one or two class with Nd-Fe-B magnet steel than the low-coercivity trade mark according to above-mentioned coercivity size fractionation.
2. composite multi-layer Nd-Fe-B magnet steel according to claim 1 is characterized in that: described some Nd-Fe-B magnet steels than the low-coercivity trade mark bond together by insulating adhesive along differently-oriented directivity.
3. composite multi-layer Nd-Fe-B magnet steel according to claim 1 and 2, it is characterized in that: the Nd-Fe-B magnet steel that also comprises another sheet higher coercivity trade mark, the Nd-Fe-B magnet steel of described another sheet higher coercivity trade mark bonds together by insulating adhesive and outermost Nd-Fe-B magnet steel than the low-coercivity trade mark along differently-oriented directivity, and the Nd-Fe-B magnet steel of described another sheet higher coercivity trade mark differs one or two class with Nd-Fe-B magnet steel than the low-coercivity trade mark according to above-mentioned coercivity size fractionation.
4. composite multi-layer Nd-Fe-B magnet steel according to claim 3 is characterized in that: the Nd-Fe-B magnet steel of described two higher coercivity trades mark is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202518050U CN201745223U (en) | 2010-07-08 | 2010-07-08 | Composite multi-layer NdFeB magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202518050U CN201745223U (en) | 2010-07-08 | 2010-07-08 | Composite multi-layer NdFeB magnet |
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| Publication Number | Publication Date |
|---|---|
| CN201745223U true CN201745223U (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202518050U Expired - Lifetime CN201745223U (en) | 2010-07-08 | 2010-07-08 | Composite multi-layer NdFeB magnet |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454852A (en) * | 2014-11-28 | 2015-03-25 | 烟台首钢磁性材料股份有限公司 | Permanent magnet neodymium iron boron steel insulating bonding method and special extrusion tool |
| CN111243848A (en) * | 2020-02-28 | 2020-06-05 | 安徽大地熊新材料股份有限公司 | Sintered neodymium-iron-boron magnet and preparation method thereof |
| CN112635187A (en) * | 2020-12-10 | 2021-04-09 | 沈阳中北通磁科技股份有限公司 | Method for manufacturing laminated rare earth permanent magnet device |
| CN113744986A (en) * | 2021-08-02 | 2021-12-03 | 安徽省瀚海新材料股份有限公司 | Processing method for neodymium iron boron magnet after cutting |
| CN114123577A (en) * | 2021-11-05 | 2022-03-01 | 珠海格力电器股份有限公司 | Magnetic steel assembly, rotor assembly and motor |
-
2010
- 2010-07-08 CN CN2010202518050U patent/CN201745223U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454852A (en) * | 2014-11-28 | 2015-03-25 | 烟台首钢磁性材料股份有限公司 | Permanent magnet neodymium iron boron steel insulating bonding method and special extrusion tool |
| US9782953B2 (en) | 2014-11-28 | 2017-10-10 | Yantai Shougang Magnetic Materials Inc. | Apparatus and a method for bonding and insulating Nd—Fe—B permanent magnets |
| CN111243848A (en) * | 2020-02-28 | 2020-06-05 | 安徽大地熊新材料股份有限公司 | Sintered neodymium-iron-boron magnet and preparation method thereof |
| CN112635187A (en) * | 2020-12-10 | 2021-04-09 | 沈阳中北通磁科技股份有限公司 | Method for manufacturing laminated rare earth permanent magnet device |
| CN113744986A (en) * | 2021-08-02 | 2021-12-03 | 安徽省瀚海新材料股份有限公司 | Processing method for neodymium iron boron magnet after cutting |
| CN113744986B (en) * | 2021-08-02 | 2023-09-22 | 安徽省瀚海新材料股份有限公司 | Treatment method for cut neodymium-iron-boron magnet |
| CN114123577A (en) * | 2021-11-05 | 2022-03-01 | 珠海格力电器股份有限公司 | Magnetic steel assembly, rotor assembly and motor |
| CN114123577B (en) * | 2021-11-05 | 2023-01-31 | 珠海格力电器股份有限公司 | Magnetic steel assembly, rotor assembly and motor |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110216 |
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| CX01 | Expiry of patent term |