CN109285670A - Reduce the method and coil windings suit component of transformer core no-load loss - Google Patents
Reduce the method and coil windings suit component of transformer core no-load loss Download PDFInfo
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- CN109285670A CN109285670A CN201811355747.3A CN201811355747A CN109285670A CN 109285670 A CN109285670 A CN 109285670A CN 201811355747 A CN201811355747 A CN 201811355747A CN 109285670 A CN109285670 A CN 109285670A
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- amorphous alloy
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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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
- H01F1/12—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 soft-magnetic materials
- H01F1/14—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 soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/153—Amorphous metallic alloys, e.g. glassy metals
- H01F1/15308—Amorphous metallic alloys, e.g. glassy metals based on Fe/Ni
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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Soft Magnetic Materials (AREA)
Abstract
The present invention provides the methods and coil windings suit component that reduce transformer core no-load loss, are related to transformer technology field.The method of the reduction transformer core no-load loss includes: amorphous alloy core of the formation with joining seam gap after Structures of Multilayers Amorphous Alloys band overlap joint, and coil windings are then sleeved on amorphous alloy in the heart；Composite material is injected in the joining seam gap of amorphous alloy core, and curing molding；Wherein, composite material includes epoxy powder, volatile solvent and ferrimagnet, and the mass ratio of epoxy powder, volatile solvent and ferrimagnet is 40-60:70-90:1.The coil windings suit component is by forming the amorphous alloy core for having tower head gap after overlapping Structures of Multilayers Amorphous Alloys band respectively, the filled composite materials in joining seam gap, it is filled in ferromagnetic material in joining seam gap to reveal without causing, reduces the no-load loss value of alloy transformer.
Description
Technical field
The present invention relates to transformer technology field, in particular to the method for reducing transformer core no-load loss and
Coil windings suit component.
Background technique
Amorphous alloy transformer iron core is formed by stacking using amorphous alloy strips, due to the metallic atom of amorphous alloy strips
In unordered noncrystal arrangement, it compared with traditional magnetic material, have high saturation magnetic induction, low-loss, high initial permeability and
The characteristics such as low-coercivity, so that amorphous alloy core possesses lower no-load loss.
However, amorphous core in production process using opening sheet amorphous band be formed by stacking, due to every group it is non-
There are certain thickness when crystal zone material is sheared, therefore forming a width in every group of amorphous band lap-joint is 2mm, length 3-
The presence in the gap of 5mm, this gap improves the magnetic resistance of iron core, to increase the unloaded damage of amorphous alloy transformer iron core
Consumption value.
In consideration of it, proposing the application.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for reducing transformer core no-load loss, it is intended to reduce transformer
No-load loss value.
Another object of the present invention is to provide a kind of coil windings suit components of for transformer, can effectively drop
The no-load loss value of low-alloy transformer.
The present invention is implemented as follows:
A method of transformer core no-load loss is reduced, is included the following steps:
The amorphous alloy core with joining seam gap is formed after Structures of Multilayers Amorphous Alloys band overlap joint, then by coil windings set
In the heart mounted in amorphous alloy；
Composite material is injected in the joining seam gap of amorphous alloy core, and curing molding；
Wherein, composite material includes epoxy powder, volatile solvent and ferrimagnet, and epoxy powder, volatility are molten
The mass ratio of agent and ferrimagnet is 40-60:70-90:1.
Further, in preferred embodiments of the present invention, the quality of epoxy powder, volatile solvent and ferrimagnet
The ratio between be 47-53:76-84:1.
Further, in preferred embodiments of the present invention, volatile solvent appointing in ketone, alcohol ethers and esters
It anticipates one kind；
Preferably, volatile solvent is selected from acetone, cyclohexanone, methyl iso-butyl ketone (MIBK)-methyl ethyl ketone, ethylene glycol monomethyl ether and acetic acid
Any one in ethyl ester；More preferably acetone.
Further, in preferred embodiments of the present invention, ferrimagnet is selected from iron powder and/or soft magnetism iron powder.
Further, in preferred embodiments of the present invention, the forming process of composite material is the following steps are included: by compound
After material injection suit in the joining seam gap of amorphous alloy core, 30-60min is stood；
Preferably, the joining seam gap of amorphous alloy core is heated during standing.
Further, in preferred embodiments of the present invention, the overlap joint process of amorphous alloy core is to close every layer of amorphous
Gold ribbon material head and the tail overlap, and form joining seam at every layer of amorphous alloy strips and the joining seam of another layer of amorphous alloy strips below
Gap.
Further, in preferred embodiments of the present invention, coil windings are sleeved on the process of amorphous alloy in the heart
The following steps are included:
Amorphous alloy core is successively opened at tower head position according to overlap joint sequence, coil windings are then sleeved on amorphous
On alloy core；
Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
A kind of coil windings suit component of for transformer, including Structures of Multilayers Amorphous Alloys band, every layer of amorphous alloy strip
Material head and the tail overlap, and the lap-joint of another layer of amorphous alloy strips of every layer of amorphous alloy strips and lower section forms overlap joint gap；
It overlaps and is filled with composite material in gap, composite material includes epoxy powder, volatile solvent and ferrimagnet.
Further, in preferred embodiments of the present invention, the mass ratio of epoxy powder, solvent and ferrimagnet is
40-60:70-90:1, preferably 47-53:76-84:1.
Further, in preferred embodiments of the present invention, the length for overlapping gap is 3-5mm.
The beneficial effects of the present invention are: the side for the reduction transformer core no-load loss that the present invention obtains by above-mentioned design
Method has the amorphous alloy core in tower head gap by being formed after overlapping Structures of Multilayers Amorphous Alloys band respectively, by amorphous
Alloy core injects composite material after coil windings are set in the joining seam gap of amorphous alloy core, by composite wood
The improvement of material is filled in ferromagnetic material in joining seam gap to reveal without causing, reduce the no-load loss value of alloy transformer,
The level of noise that amorphous alloy transformer can be reduced simultaneously, improves the overall performance of amorphous alloy transformer.
The present invention also provides a kind of coil windings suit component of for transformer, by by Structures of Multilayers Amorphous Alloys band
Material forms the amorphous alloy core for having tower head gap after overlapping respectively, and the filled composite materials in joining seam gap make ferromagnetic material
Material is filled in joining seam gap to be revealed without causing, and reduces the no-load loss value of alloy transformer.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of embodiment of the present invention
Attached drawing be briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not to be seen as
It is the restriction to range, it for those of ordinary skill in the art, without creative efforts, can be with root
Other relevant attached drawings are obtained according to these attached drawings.
Fig. 1 is the amorphous alloy transformer iron core joining seam portion structure schematic diagram that embodiment of the present invention provides；
Fig. 2 is the structural schematic diagram that single group amorphous band stacks in Fig. 1；
Fig. 3 is the lateral assembling plan view of suit process；
Fig. 4 is the front view of suit process solid assembly.
Icon: 10- first layer amorphous band；20- second layer amorphous band；30- third layer amorphous band；The 4th layer of 40-
Amorphous band；100- overlaps gap.
Specific embodiment
To keep the purposes, technical schemes and advantages of embodiment of the present invention clearer, implement below in conjunction with the present invention
The technical solution in embodiment of the present invention is clearly and completely described in attached drawing in mode, it is clear that described reality
The mode of applying is some embodiments of the invention, rather than whole embodiments.Based on the embodiment in the present invention, ability
Domain those of ordinary skill every other embodiment obtained without creative efforts, belongs to the present invention
The range of protection.Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit below and is wanted
The scope of the present invention of protection is sought, but is merely representative of selected embodiment of the invention.Based on the embodiment in the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Invent the range of protection.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of
The description present invention and simplified description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with spy
Fixed orientation construction and operation, therefore be not considered as limiting the invention.
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
The embodiment of the invention provides a kind of methods for reducing transformer core no-load loss, include the following steps: multilayer
The amorphous alloy core with joining seam gap is formed after amorphous alloy strips overlap joint, coil windings are then sleeved on amorphous alloy
On iron core；Composite material is injected in the joining seam gap of amorphous alloy core, and curing molding.
Specifically, incorporated by reference to Fig. 1 and Fig. 2, the overlap joint process of amorphous alloy core is by every layer of amorphous alloy strips head and the tail
Overlap joint, and joining seam gap is formed at every layer of amorphous alloy strips and the joining seam of another layer of amorphous alloy strips below.This portion
The general step for making iron core when process that point overlapped in the prior art, after overlap joint two layers adjacent of amorphous alloy strips it
Between will form a joining seam gap, as four layers of amorphous alloy strips form joining seam gap everywhere in Fig. 2.
In addition, amorphous alloy strips are the material for being generally used for preparing alloy transformer, do not do excessively repeat herein.
Specifically, incorporated by reference to Fig. 1-Fig. 4, it includes following step that coil windings, which are sleeved on the process of amorphous alloy in the heart,
It is rapid: amorphous alloy core successively being opened at tower head position according to overlap joint sequence, coil windings are then sleeved on amorphous alloy
On iron core；Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.It is whole after suit coil winding
Body structure is also roughly the same with structure in Fig. 1, and the specific process that is set with can also combine prior art.Coil windings are existing
It is used to prepare the loop construction of transformer, does not do excessively repeat herein.
Specifically, the forming process of composite material is the following steps are included: by amorphous alloy after composite material injection suit
In the joining seam gap of the heart, 30-60min is stood.Composite material is injected into the material solidification molding after standing behind joining seam gap, no
It is easy to happen the leakage of ferromagnetic material, can be effectively reduced the no-load loss value of alloy transformer, while amorphous conjunction can be reduced
The level of noise of golden transformer improves the overall performance of amorphous alloy transformer.
Preferably, the joining seam gap of amorphous alloy core is heated during standing, is promoted by heating compound
The curing molding of material accelerates throughput rate and improves molding effect.
Specifically, composite material includes epoxy powder, volatile solvent and ferrimagnet, and epoxy powder, solvent and
The mass ratio of ferrimagnet is 40-60:70-90:1.Inventor's discovery uses substrate of the epoxy powder as coagulation forming
Ferromagnetic material solidification rear stability can be made stronger, be not in the leakage of ferromagnetic material.The dosage of ferromagnetic material is unsuitable excessively high
Or too low, inventor's discovery: the dosage of ferromagnetic material is too low cannot to play the effect for reducing the no-load loss value of alloy transformer；
The dosage of ferromagnetic material is excessively high, can not fix ferromagnetic material after will appear epoxy powder solidification, transformer working environment is caused to dislike
Change.
The proportion of composite material is optimized in inventor, the matter of epoxy powder, volatile solvent and ferrimagnet
The ratio between amount is 47-53:76-84:1.The dosage control of composite material each component can further decrease alloy within the above range
The no-load loss value of transformer, while the level of noise of amorphous alloy transformer can be reduced.
Specifically, any one of volatile solvent in ketone, alcohol ethers and esters；Preferably, volatile solvent
Any one in acetone, cyclohexanone, methyl iso-butyl ketone (MIBK)-methyl ethyl ketone, ethylene glycol monomethyl ether and ethyl acetate；More preferably
Acetone.Inventors have found that can effectively dissolve epoxy powder (epoxy resin), curing molding using above several volatile solvents
Effect it is preferable.
Specifically, ferrimagnet is selected from iron powder and/or soft magnetism iron powder.Using general iron powder or using soft magnetism iron powder into
Row filling can reach the no-load loss value for reducing alloy transformer well.
Incorporated by reference to Fig. 1 and Fig. 2, the embodiment of the invention also provides a kind of coil windings suit component of for transformer,
Including Structures of Multilayers Amorphous Alloys band, every layer of amorphous alloy strips head and the tail are overlapped, another layer of every layer of amorphous alloy strips and lower section
The lap-joint of amorphous alloy strips forms overlap joint gap 100.Such as mutually overlapping end to end for first layer amorphous band 10, the second layer is non-
The also phase interconnection end to end of the mutual overlap joint end to end of crystal zone material 20, same third layer amorphous band 30 and the 4th layer of amorphous band 40
It connects.An overlap joint gap 100 is formed at the joining seam of first layer amorphous band 10 and second layer amorphous band 20；It is non-in the second layer
An overlap joint gap 100 is formed at the joining seam of crystal zone material 20 and third layer amorphous band 30；In third layer amorphous band 30 and
An overlap joint gap 100 is formed at the joining seam of four layers of amorphous band 40.Specifically, the length for overlapping gap 100 is 3-5mm, wide
It spends corresponding with the thickness of amorphous band.
Specifically, overlap gap 100 in be filled with composite material, composite material include epoxy powder, volatile solvent and
Ferrimagnet.The introduction of specification other parts is please referred to for the introduction of composite material.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The present embodiment provides a kind of methods for reducing transformer core no-load loss, comprising the following steps:
Firstly, every layer of amorphous alloy strips head and the tail are overlapped, and every layer of amorphous alloy strips and another layer below are non-
Joining seam gap is formed at the joining seam of peritectic alloy band, to obtain amorphous alloy core.
Secondly, amorphous alloy core is successively opened at tower head position according to overlap joint sequence, then coil windings are set with
Amorphous alloy in the heart；Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
Finally, standing 30min in the joining seam gap of amorphous alloy core after composite material injection suit；It is wherein compound
Material includes epoxy powder, acetone and iron powder, and the mass ratio of epoxy powder, acetone and iron powder is 40:70:1.
Embodiment 2
The present embodiment provides a kind of methods for reducing transformer core no-load loss, comprising the following steps:
Firstly, every layer of amorphous alloy strips head and the tail are overlapped, and every layer of amorphous alloy strips and another layer below are non-
Joining seam gap is formed at the joining seam of peritectic alloy band, to obtain amorphous alloy core.
Secondly, amorphous alloy core is successively opened at tower head position according to overlap joint sequence, then coil windings are set with
Amorphous alloy in the heart；Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
Finally, standing 60min in the joining seam gap of amorphous alloy core after composite material injection suit；It is wherein compound
Material includes epoxy powder, acetone and iron powder, and the mass ratio of epoxy powder, acetone and iron powder is 60:90:1.
Embodiment 3
The present embodiment provides a kind of methods for reducing transformer core no-load loss, comprising the following steps:
Firstly, every layer of amorphous alloy strips head and the tail are overlapped, and every layer of amorphous alloy strips and another layer below are non-
Joining seam gap is formed at the joining seam of peritectic alloy band, to obtain amorphous alloy core.
Secondly, amorphous alloy core is successively opened at tower head position according to overlap joint sequence, then coil windings are set with
Amorphous alloy in the heart；Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
Finally, standing 50min in the joining seam gap of amorphous alloy core after composite material injection suit；It is wherein compound
Material includes epoxy powder, cyclohexanone and soft magnetism iron powder, and the mass ratio of epoxy powder, cyclohexanone and soft magnetism iron powder is 47:
76:1。
Embodiment 4
The present embodiment provides a kind of methods for reducing transformer core no-load loss, comprising the following steps:
Firstly, every layer of amorphous alloy strips head and the tail are overlapped, and every layer of amorphous alloy strips and another layer below are non-
Joining seam gap is formed at the joining seam of peritectic alloy band, to obtain amorphous alloy core.
Secondly, amorphous alloy core is successively opened at tower head position according to overlap joint sequence, then coil windings are set with
Amorphous alloy in the heart；Amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
Finally, standing 50min in the joining seam gap of amorphous alloy core after composite material injection suit；It is wherein compound
Material includes epoxy powder, ethylene glycol monomethyl ether and soft magnetism iron powder, and the quality of epoxy powder, ethylene glycol monomethyl ether and soft magnetism iron powder it
Than for 53:84:1.
Test example
Product will be obtained using conventional method in embodiment 1-4 prepare transformer component, and tests obtained transformation
The no-load loss value of device in use is tested in 1.35T magnetic density, and frequency carries out under conditions of 50Hz.Comparative example
In be to be not injected into composite material, other preparation process are same as Example 1.
The results show that the no-load loss value that embodiment 1-4 is tested is respectively 0.16,0.17,0.16 and 0.17, it is right
No-load loss value in ratio is 0.18.It can be seen that unloaded damage can be effectively reduced using the method in the embodiment of the present invention
Consumption value.
In conclusion the present invention provides a kind of reduction transformer core zero load that the present invention obtains by above-mentioned design damages
The method of consumption, by forming the amorphous alloy core for having tower head gap after overlapping Structures of Multilayers Amorphous Alloys band respectively,
Amorphous alloy core is injected composite material after coil windings are set in the joining seam gap of amorphous alloy core, by right
The improvement of composite material is filled in ferromagnetic material in joining seam gap to reveal without causing, and reduces the unloaded damage of alloy transformer
Consumption value, while the level of noise of amorphous alloy transformer can be reduced, improve the overall performance of amorphous alloy transformer.The present invention is also
A kind of coil windings suit component of for transformer is provided, by being formed after overlapping Structures of Multilayers Amorphous Alloys band respectively
Has the amorphous alloy core in tower head gap, the filled composite materials in joining seam gap are likewise supplied with above-mentioned advantage.
The foregoing is merely the preferred embodiment of the present invention, are not intended to restrict the invention, for this field
For technical staff, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for reducing transformer core no-load loss, which comprises the steps of:
The amorphous alloy core with joining seam gap is formed after Structures of Multilayers Amorphous Alloys band overlap joint, is then sleeved on coil windings
The amorphous alloy is in the heart；
Composite material is injected in the joining seam gap of the amorphous alloy core, and curing molding；
Wherein, the composite material includes epoxy powder, volatile solvent and ferrimagnet, and the epoxy powder, described
The mass ratio of volatile solvent and the ferrimagnet is 40-60:70-90:1.
2. the method according to claim 1 for reducing transformer core no-load loss, which is characterized in that the epoxy powder
The mass ratio of last, the described volatile solvent and the ferrimagnet is 47-53:76-84:1.
3. the method according to claim 1 or 2 for reducing transformer core no-load loss, which is characterized in that the volatilization
Any one of property solvent in ketone, alcohol ethers and esters；
Preferably, the volatile solvent is selected from acetone, cyclohexanone, methyl iso-butyl ketone (MIBK)-methyl ethyl ketone, ethylene glycol monomethyl ether and acetic acid
Any one in ethyl ester；More preferably acetone.
4. the method according to claim 1 or 2 for reducing transformer core no-load loss, which is characterized in that described ferromagnetic
Property material be selected from iron powder and/or soft magnetism iron powder.
5. the method according to claim 1 for reducing transformer core no-load loss, which is characterized in that the composite material
Forming process the following steps are included: by the composite material injection suit after the amorphous alloy core the joining seam gap
In, stand 30-60min；
Preferably, the joining seam gap of the amorphous alloy core is heated during standing.
6. the method according to claim 1 for reducing transformer core no-load loss, which is characterized in that the amorphous alloy
The overlap joint process of iron core be every layer of amorphous alloy strips head and the tail are overlapped, and every layer of amorphous alloy strips with below
Another layer amorphous alloy strips joining seam at form the joining seam gap.
7. it is according to claim 1 reduce transformer core no-load loss method, which is characterized in that by the coil around
Group be sleeved on amorphous alloy process in the heart the following steps are included:
The amorphous alloy core is successively opened at tower head position according to overlap joint sequence, is then sleeved on the coil windings
The amorphous alloy is in the heart；
The amorphous alloy core joining seam is successively closed according to band laminated layer sequence after the completion of suit.
8. a kind of coil windings suit component of for transformer, which is characterized in that including Structures of Multilayers Amorphous Alloys band, every layer of institute
It states amorphous alloy strips head and the tail to overlap, another layer amorphous alloy strips of every layer of amorphous alloy strips and lower section are taken
It meets place and forms overlap joint gap；
Composite material is filled in the overlap joint gap, the composite material includes epoxy powder, volatile solvent and ferromagnetism
Material.
9. the coil windings suit component of for transformer according to claim 8, which is characterized in that the epoxy powder
The mass ratio of last, the described solvent and the ferrimagnet is 40-60:70-90:1, preferably 47-53:76-84:1.
10. the coil windings suit component of for transformer according to claim 8, which is characterized in that the overlap joint is empty
The length of gap is 3-5mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635176A (en) * | 2020-11-30 | 2021-04-09 | 上海置信日港电气有限公司 | Noise reduction method for amorphous alloy iron core |
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| CN104112571A (en) * | 2014-06-20 | 2014-10-22 | 上海置信电气非晶有限公司 | Noise reduction type amorphous alloy transformer |
| CN104312517A (en) * | 2014-10-14 | 2015-01-28 | 深圳市沃特新材料股份有限公司 | Degradable magnetic-permeable hot-melt adhesive as well as degradable magnetic-permeable hot-melt adhesive membrane and preparation method of degradable magnetic-permeable hot-melt adhesive membrane |
| CN106098351A (en) * | 2016-06-06 | 2016-11-09 | 柳州市海格电气有限公司 | The SH15 type amorphous alloy oil immersion type distribution transformer manufacture method of 10kV |
| CN106128687A (en) * | 2016-08-01 | 2016-11-16 | 浙江艾默可科技有限公司 | A kind of method reducing amorphous iron core iron loss |
| CN106590345A (en) * | 2016-12-19 | 2017-04-26 | 深圳顺络电子股份有限公司 | Magnetic glue and inductor device using same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112635176A (en) * | 2020-11-30 | 2021-04-09 | 上海置信日港电气有限公司 | Noise reduction method for amorphous alloy iron core |
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