CN102013292A - Welded circular piezoresistor as well as preparation method and application thereof - Google Patents
Welded circular piezoresistor as well as preparation method and application thereof Download PDFInfo
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- CN102013292A CN102013292A CN2010105157576A CN201010515757A CN102013292A CN 102013292 A CN102013292 A CN 102013292A CN 2010105157576 A CN2010105157576 A CN 2010105157576A CN 201010515757 A CN201010515757 A CN 201010515757A CN 102013292 A CN102013292 A CN 102013292A
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- dielectric substrate
- ring
- electrodes
- sensitive resistor
- shaped pottery
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- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000758 substrate Substances 0.000 claims abstract description 41
- 229910052751 metal Inorganic materials 0.000 claims abstract description 40
- 239000002184 metal Substances 0.000 claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 17
- 229910000679 solder Inorganic materials 0.000 claims description 38
- 239000007789 gas Substances 0.000 claims description 18
- 229910002367 SrTiO Inorganic materials 0.000 claims description 14
- 229910010293 ceramic material Inorganic materials 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 8
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 5
- 238000007650 screen-printing Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 abstract description 6
- 238000010892 electric spark Methods 0.000 abstract description 6
- 238000003466 welding Methods 0.000 abstract description 6
- 238000010923 batch production Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 10
- 230000009977 dual effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910004738 SiO1 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005036 potential barrier Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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Abstract
The invention discloses a welded circular piezoresistor which comprises a circular ceramic medium substrate and a plurality of metal electrodes. At least three independent electrode combination units are uniformly distributed on the surface of the circular ceramic medium substrate in circumference. Each electrode combination unit consists of two independent metal electrodes. The invention has simple structure and high reliability, and when one metal electrode in the electrode combination unit in process of use has invalid welding point connection, the second metal electrode acts equally, thereby preventing the whole product from being invalid, ensuring the function of eliminating electric sparks of the circular piezoresistor and ensuring the safety. The invention has the advantages of stable performance, reasonable structure, convenient use, easy batch production and the like, can be applied to a gas valve motor to meet safety requirement of double safety and is suitable for the traditional manual welding and semi-automatic welding production line of motor manufacturing.
Description
Technical field
The present invention relates to the electronic devices and components field, particularly a kind of solder type annular voltage-sensitive resistor and preparation method thereof is particularly useful for the gas valve motor.
Background technology
The gas valve motor is being opened closing course and can produced electric spark between its commutator and brush during at high speed rotating, the generation of electric spark can reduce the working life of motor and produce serious electromagnetic interference, for exist great potential safety hazard for the volatile coal gas operational environment of combustibility.Abate the noise and disturb and security performance in order to absorb electric spark, must the resistance capacitance assembly be installed on motor or piezo-resistance is done the protection effect.
Because the type motor to the development of small compact, has therefore been eliminated substantially and used the resistance capacitance assembly, all adopts annular voltage-sensitive resistor, so annular voltage-sensitive resistor also obtained significant progress, for example Chinese patent ZL200310117432.2 etc.The gas valve motor need be done safety certification at present, it requires the safety function part that the difunctional structure of two parts is arranged, so need to install two annular voltage-sensitive resistors of welding in the prior art, this method exists makes motor produce the assembly technology complexity, the production line defective products is many, on the miniaturization Design of motor, bring obstruction, drawbacks such as motor production cost height, effect is not good enough.
Summary of the invention
For addressing the above problem, the purpose of this invention is to provide a kind of solder type annular voltage-sensitive resistor, it is safe and reliable, and an element just has the dual fail-safe effect.
Another object of the present invention provides the preparation method of above-mentioned solder type annular voltage-sensitive resistor.
A further object of the invention provides a kind of gas valve motor, and it meets the safety requirements of dual fail-safe.
The object of the present invention is achieved like this: a kind of solder type annular voltage-sensitive resistor, comprise ring-shaped pottery dielectric substrate and several metal electrodes, it is characterized in that: described ring-shaped pottery dielectric substrate surface is evenly distributed with at least three separate combination of electrodes unit by circumference, and each combination of electrodes unit is made up of two separate metal electrodes.
Described metal electrode adopts silver metal electrode or copper metal electrode.
Described ring-shaped pottery dielectric substrate is made by the strontium titanate base ceramic material.
Described strontium titanate base ceramic material comprises SrTiO
3With metal oxide SiO, ZrO, La
2O
3, Nb
5O
2Or one or more mixing among the CaO.
Described combination of electrodes cell distribution is in upper surface or the lower surface or the side of ring-shaped pottery dielectric substrate.
Described each combination of electrodes unit is made up of two metal electrodes arranging side by side by ring-shaped pottery dielectric substrate radian.
Described ring-shaped pottery dielectric substrate upper surface is evenly distributed with three separate combination of electrodes unit by circumference, and each combination of electrodes unit is made up of two separate metal electrodes.
The preparation method of above-mentioned solder type annular voltage-sensitive resistor comprises and makes the ring-shaped pottery dielectric substrate and make two steps of metal electrode, it is characterized in that: in the described manufacturing ring-shaped pottery dielectric substrate step, adopt the dry powder pressing process SrTiO
3The base ceramic material pressed by powder circularizes body, sinters the ring-shaped pottery dielectric substrate into through 1200～1400 ℃ under hydrogen and nitrogen mixture atmosphere, heat-treats under 800～1000 ℃ in air at last, finishes the manufacturing of ring-shaped pottery dielectric substrate; In the described manufacturing metal electrode step, adopt silk-screen printing technique the metal slurry to be printed on the surface of ring-shaped pottery dielectric substrate, make its surface be evenly distributed with at least three separate combination of electrodes unit by circumference, each combination of electrodes unit is made up of two separate metal electrodes, drying electrode and sintering and reducing electrode are made finished product then.
Described ring-shaped pottery dielectric substrate is 1.5～2.5: sintering under the hydrogen of 7～9 ratios and the nitrogen mixture atmosphere; Described oven dry electrode process is 130～170 ℃/8～12 minutes, and described sintering and reducing electrode process is 500～600 ℃/8～12 minutes.
A kind of gas valve motor includes above-mentioned solder type annular voltage-sensitive resistor.
Described gas valve motor contains three sealing wires, and each sealing wire place is provided with two solder joints, respectively with above-mentioned solder type annular voltage-sensitive resistor in two metal electrodes of each combination of electrodes unit be welded to connect.
The present invention is simple in structure, the reliability height, when solder joint connection inefficacy in use appears in one of them metal electrode of combination of electrodes unit, also have second metal electrode to play a part same, effectively prevent the product global failure, thereby guaranteed the electric spark function of going out of this annular voltage-sensitive resistor, guaranteed fail safe, it has stable performance, and is rational in infrastructure, easy to use, be easy to quantize advantages such as manufacturing, can be assemblied in the combustion gas valve with electrically motorized operation with on the motor, make it to meet the safety requirements of dual fail-safe, and be fit to the use of existing motor manufacture of intraocular welding and semi-automatic welding production line.
Description of drawings
Fig. 1 is the front view of solder type annular voltage-sensitive resistor of the present invention;
Fig. 2 is the end view of solder type annular voltage-sensitive resistor of the present invention;
Fig. 3 is the schematic diagram that gas valve motor sealing wire of the present invention and solder type annular voltage-sensitive resistor are welded to connect.
Embodiment
As shown in Figure 1, 2, the present invention is a kind of solder type annular voltage-sensitive resistor 1, comprises ring-shaped pottery dielectric substrate 12 and several metal electrodes 11.
Described ring-shaped pottery dielectric substrate 12 surfaces are evenly distributed with at least three separate combination of electrodes unit by circumference, and each combination of electrodes unit is made up of two separate metal electrodes 11.The combination of electrodes cell distribution is in upper surface or the lower surface or the side of ring-shaped pottery dielectric substrate 12.Metal electrode 11 adopts silver metal electrode or copper metal electrode.Ring-shaped pottery dielectric substrate 12 is made by the strontium titanate base ceramic material.Described strontium titanate base ceramic material comprises SrTiO
3With metal oxide SiO, ZrO, La
2O
3, Nb
5O
2Or one or more mixing among the CaO.Preferably, calculate by weight, the strontium titanate base ceramic material comprises SrTiO
390～110 parts, SiO1～3 part, ZrO1～3 part, La
2O
31～3 part, Nb
5O
20.5 0～0.2 part of～1.5 part, CaO.In the present embodiment, ring-shaped pottery dielectric substrate 12 upper surfaces are evenly distributed with three separate combination of electrodes unit by circumference, and each combination of electrodes unit is made up of two two metal electrodes 11 separate, that arrange side by side by ring-shaped pottery dielectric substrate 12 radians.
The preparation method of above-mentioned solder type annular voltage-sensitive resistor comprises and makes ring-shaped pottery dielectric substrate 12 and make 11 two steps of metal electrode.In described manufacturing ring-shaped pottery dielectric substrate 12 steps, adopt the dry powder pressing process SrTiO
3The base ceramic material pressed by powder circularizes body, 1.5～2.5: sinter ceramic body into through 1200～1400 ℃ under the hydrogen of 7～9 ratios and the nitrogen mixture atmosphere, in air, heat-treat under 800～1000 ℃ at last, finish ring-shaped pottery dielectric substrate 12 and make; In described manufacturing metal electrode 11 steps, adopt silk-screen printing technique the metal slurry to be printed on the surface of ring-shaped pottery dielectric substrate 12, make its surface be evenly distributed with at least three separate combination of electrodes unit by circumference, each combination of electrodes unit is made up of two separate metal electrodes 11, be 130～170 ℃/8～12 minutes oven dry electrodes through technology then, technology is 500～600 ℃/8～12 minutes sintering and reducing electrodes, makes finished product.
Be contained in a kind of gas valve motor on the gas piping, include above-mentioned solder type annular voltage-sensitive resistor 1, have the motor of absorption electric spark function.As shown in Figure 3, described gas valve motor contains three sealing wires 3, and each sealing wire 3 place is provided with two solder joints 13, respectively with above-mentioned solder type annular voltage-sensitive resistor 1 in two metal electrodes 11 of each combination of electrodes unit be welded to connect.The present invention is according to SrTiO
3The skin effect of base electric capacity-pressure-sensitive complex function ceramic material, print out six equidistant absolute electrodes 11 on ring-shaped pottery dielectric substrate 12 same surfaces, simultaneously per two electrodes 11 are formed a combination of electrodes unit, assembly structure size according to the gas valve motor is arranged in three symmetric parts, the three place's sealing wires 3 that form six pads 13 and motor are connected as scolding tin, make that each sealing wire 3 place has two solder joints 13 to be connected with this annular voltage-sensitive resistor on the gas valve motor.Wherein the unit for electrical property parameters of six of this annular voltage-sensitive resistor electrodes 11 is the same, and per two electrodes are formed the combination of electrodes unit of tool independence electrical property function.
The two pad syndetons of binary electrode are to have made to comprise two combination of electrodes unit that same electrical property function metal electrode is arranged on same monomer electrode position, has dual fail-safe effect (spare part function), an element plays two elements, has guaranteed the type motor passing through in safety certification.
The advantage that the invention is compared with prior art had is that each combination of electrodes unit has two metal electrode and pads that independent same electrical property function is arranged, can when losing efficacy, one of them pad of product effectively prevent the product global failure, play the dual fail-safe effect, and it is simple in structure, and is easy to operate when producing and use product.Can manufacture and the use of suitable motor production line.In addition, adopt SrTiO
3Base electric capacity-pressure-sensitive complex function ceramic material, and pass through atmosphere sintering technology and realize that crystal grain semiconducting and Technology for Heating Processing form insulating barrier and crystal boundary potential barrier at crystal boundary, it is lower to make product of the present invention have a pressure sensitive voltage, dielectric constant is higher, advantages such as each interelectrode unit for electrical property parameters difference value is little have concurrently pressure-sensitive and complex function capacitance characteristic.
Embodiment
The preparation method may further comprise the steps: SrTiO
3The parameter testing of the manufacturing of the manufacturing of the manufacturing of material, ring-shaped pottery dielectric substrate 12, metal electrode 11, solder type annular voltage-sensitive resistor.
Concrete manufacture process:
1, SrTiO
3The manufacturing of material
By proportioning SrTiO
3: SiO: ZrO: La
2O
3: Nb
5O
2: CaO=100: 2: 2: 1.7: above raw material were evenly mixed in 0.8: 0.1,, be dried into 100～200 order powdered granules and manufacture SrTiO for 180 ℃ again through 24 hours technology fine grinding particles of ball milling
3Base electric capacity-pressure-sensitive complex function ceramic material.
2, the manufacturing of ring-shaped pottery dielectric substrate 12
Design this solder type annular voltage-sensitive resistor by the fitted position of gas valve motor and be of a size of external diameter Φ 8.0 ± 0.2mm, internal diameter is Φ 5.0 ± 0.2mm, and thickness is 0.5～0.7mm.
The manufacture process of ring-shaped pottery dielectric substrate 12: adopt the mechanical type dry powder press utilize ring mould under 50000N pressure 3 seconds process of pressurize SrTiO
3Base electric capacity-pressure-sensitive complex function ceramic material pressed by powder circularizes body; Under the hydrogen of 2: 8 ratios and nitrogen mixture atmosphere, under 60 minutes technology of 1300 ℃ of sintering, sinter ceramic body into; Ceramic body adopts and heat-treat 180 minutes technology under 900 ℃ in air, finishes the ring-shaped pottery dielectric substrate 12 of this solder type annular voltage-sensitive resistor and makes.
3, the manufacturing of metal electrode 11
Carry out custom-designed electrode pattern by the matching requirements of gas valve motor and produce the electrode half tone; Adopt silk-screen printing technique silver to be starched on the front surface of the ceramic body that is printed on this solder type annular voltage-sensitive resistor, make its surface be evenly distributed with at least three separate combination of electrodes unit by circumference, each combination of electrodes unit is made up of two silver metal electrodes 11 separate, that arrange side by side by ring-shaped pottery dielectric substrate 12 radians; Through taking 150 ℃/10 minutes technology oven dry electrodes and adopting 550 ℃/10 minutes sintering and reducing electrode sintering process; Made gas valve motor solder type annular voltage-sensitive resistor finished product.
4, the parameter testing of solder type annular voltage-sensitive resistor
Adopt custom-designed six probe test heads and the pressure-sensitive testers of six tunnel annulars to carry out the parameter of E10 value difference value, α value between the E10 value, electrode of this solder type annular voltage-sensitive resistor.Adopt the direct capacitance value of capacitance measuring tester measurement products.
The electric performance test data of this solder type annular voltage-sensitive resistor are as shown in table 1, the equal conformance with standard of every index.
Table 1.
Claims (10)
1. solder type annular voltage-sensitive resistor, comprise ring-shaped pottery dielectric substrate and several metal electrodes, it is characterized in that: described ring-shaped pottery dielectric substrate surface is evenly distributed with at least three separate combination of electrodes unit by circumference, and each combination of electrodes unit is made up of two separate metal electrodes.
2. solder type annular voltage-sensitive resistor according to claim 1 is characterized in that: described metal electrode adopts silver metal electrode or copper metal electrode.
3. solder type annular voltage-sensitive resistor according to claim 1 is characterized in that: described ring-shaped pottery dielectric substrate is made by the strontium titanate base ceramic material.
4. solder type annular voltage-sensitive resistor according to claim 3 is characterized in that: described strontium titanate base ceramic material comprises SrTiO
3With metal oxide SiO, ZrO, La
2O
3, Nb
5O
2Or one or more mixing among the CaO.
5. solder type annular voltage-sensitive resistor according to claim 1 is characterized in that: described combination of electrodes cell distribution is in upper surface or the lower surface or the side of ring-shaped pottery dielectric substrate.
6. solder type annular voltage-sensitive resistor according to claim 1 is characterized in that: described each combination of electrodes unit is made up of two metal electrodes arranging side by side by ring-shaped pottery dielectric substrate radian.
7. the preparation method of a solder type annular voltage-sensitive resistor comprises and makes the ring-shaped pottery dielectric substrate and make two steps of metal electrode, it is characterized in that: in the described manufacturing ring-shaped pottery dielectric substrate step, adopt the dry powder pressing process SrTiO
3The base ceramic material pressed by powder circularizes body, sinters the ring-shaped pottery dielectric substrate into through 1200～1400 ℃ under hydrogen and nitrogen mixture atmosphere, heat-treats under 800～1000 ℃ in air at last, finishes the manufacturing of ring-shaped pottery dielectric substrate; In the described manufacturing electrode step, adopt silk-screen printing technique the metal slurry to be printed on the surface of ring-shaped pottery dielectric substrate, make its surface be evenly distributed with at least three separate combination of electrodes unit by circumference, each combination of electrodes unit is made up of two separate metal electrodes, drying electrode and sintering and reducing electrode are made finished product then.
8. the preparation method of solder type annular voltage-sensitive resistor according to claim 7 is characterized in that: described ring-shaped pottery dielectric substrate is 1.5～2.5: sintering under the hydrogen of 7～9 ratios and the nitrogen mixture atmosphere; Described oven dry electrode process is 130～170 ℃/8～12 minutes, and described sintering and reducing electrode process is 500～600 ℃/8～12 minutes.
9. a gas valve motor is characterized in that: use the described solder type annular voltage-sensitive resistor of arbitrary claim among the requirement 1-6 that has the right.
10. gas valve motor according to claim 9, it is characterized in that: described gas valve motor contains three sealing wires, each sealing wire place is provided with two solder joints, respectively with described solder type annular voltage-sensitive resistor in two metal electrodes of each combination of electrodes unit be welded to connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010515757A CN102013292B (en) | 2010-10-22 | 2010-10-22 | Welded circular piezoresistor as well as preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010515757A CN102013292B (en) | 2010-10-22 | 2010-10-22 | Welded circular piezoresistor as well as preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102013292A true CN102013292A (en) | 2011-04-13 |
| CN102013292B CN102013292B (en) | 2012-09-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010515757A Expired - Fee Related CN102013292B (en) | 2010-10-22 | 2010-10-22 | Welded circular piezoresistor as well as preparation method and application thereof |
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| Country | Link |
|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723818A (en) * | 2012-06-26 | 2012-10-10 | 广东风华高新科技股份有限公司 | Thorn-shaped grounded de-noising element of micro motor rotor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02146702A (en) * | 1988-08-12 | 1990-06-05 | Taiyo Yuden Co Ltd | Voltage-dependent nonlinear resistor |
| JP2005005293A (en) * | 2003-06-09 | 2005-01-06 | Asmo Co Ltd | Varistor, commutator, rotor, and motor |
| CN1629986A (en) * | 2003-12-18 | 2005-06-22 | 广东风华高新科技集团有限公司 | Copper electrode strontium titanate annular piezoresistor and method for making same |
| JP2007043759A (en) * | 2005-07-29 | 2007-02-15 | Nidec Copal Corp | Motor |
-
2010
- 2010-10-22 CN CN201010515757A patent/CN102013292B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02146702A (en) * | 1988-08-12 | 1990-06-05 | Taiyo Yuden Co Ltd | Voltage-dependent nonlinear resistor |
| JP2005005293A (en) * | 2003-06-09 | 2005-01-06 | Asmo Co Ltd | Varistor, commutator, rotor, and motor |
| CN1629986A (en) * | 2003-12-18 | 2005-06-22 | 广东风华高新科技集团有限公司 | Copper electrode strontium titanate annular piezoresistor and method for making same |
| JP2007043759A (en) * | 2005-07-29 | 2007-02-15 | Nidec Copal Corp | Motor |
Non-Patent Citations (1)
| Title |
|---|
| 《电子元件与材料》 20030630 李红耘等 《SrTiO3 环型压敏电阻器的研制及商品化生产》 第1页第4-5段，第2页第1-6段 4 第22卷, 第6期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102723818A (en) * | 2012-06-26 | 2012-10-10 | 广东风华高新科技股份有限公司 | Thorn-shaped grounded de-noising element of micro motor rotor |
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|---|---|
| CN102013292B (en) | 2012-09-26 |
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