CN109161080A - A kind of rotor punching and preparation method thereof - Google Patents
A kind of rotor punching and preparation method thereof Download PDFInfo
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- CN109161080A CN109161080A CN201810921064.3A CN201810921064A CN109161080A CN 109161080 A CN109161080 A CN 109161080A CN 201810921064 A CN201810921064 A CN 201810921064A CN 109161080 A CN109161080 A CN 109161080A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/068—Ultra high molecular weight polyethylene
Abstract
The invention discloses a kind of rotor punching and preparation method thereof, the raw material including following parts by weight: graphite electrode powder 23-34 parts discarded, 6.6-8.5 parts of terephthalic acid (TPA), 12.4-16.5 parts of glycerine, 3.4-5.5 parts of nano-titanium dioxide, 4.2-6 parts of tea dust, 5-7.5 parts of lemongrass, 11.2-14.5 parts of phenolic resin, 22-28 parts of ultra-high molecular weight polyethylene, 4.5-6.4 parts of coupling agent and 8.6-12.8 parts of ethylene propylene diene rubber.Raw material sources of the present invention are extensive, by using different preparation processes to different raw materials, obtain different products, again by different product mixing and compression moulding in a mold, the finished product of preparation not only has good conductive property, and also has good mechanical property, and prospect of the application is wide.
Description
Technical field
The present invention relates to punching field, specifically a kind of rotor punching.
Background technique
Motor is commonly called as motor, refers to a kind of calutron that electric energy conversion or transmitting are realized according to the law of electromagnetic induction, main
Acting on is to generate driving torque, as electrical appliance or the power source of various machinery.It divides: can be divided into according to working power type
Direct current generator and alternating current generator.
Usually by structures such as magnetic pole of the stator, rotor (armature), commutator (being commonly called as commutator), brush, casing, bearings in motor
At stator and rotor are its most important components, and the part fixed in motor is called stator, has installed in pairs straight above it
Flow the static main pole of excitation；And rotating part will install armature winding above rotor, generate induction electric after energization
Gesture serves as rotating excitation field.
Existing stator and rotor mostly use punching to make, and punching includes steel punching and resin punching, existing resin punching
Although piece can satisfy the use demand of motor, but the finished product electric conductivity difference prepared causes using effect poor, this is just people
Use bring inconvenience.
Summary of the invention
The purpose of the present invention is to provide a kind of rotor punchings, to solve the problems mentioned in the above background technology.
To achieve the above object, the invention provides the following technical scheme:
The raw material including following parts by weight: a kind of rotor punching discards graphite electrode powder 23-34 parts, terephthaldehyde
6.6-8.5 parts sour, 12.4-16.5 parts of glycerine, 3.4-5.5 parts of nano-titanium dioxide, 4.2-6 parts of tea dust, lemongrass 5-7.5
Part, 11.2-14.5 parts of phenolic resin, 22-28 parts of ultra-high molecular weight polyethylene, 4.5-6.4 parts of coupling agent and ethylene propylene diene rubber
8.6-12.8 part.
As a further solution of the present invention: discarded graphite electrode powder includes that granularity 80-120 purpose discards graphite electrode powder
And granularity 200-240 purpose discards graphite electrode powder, granularity 80-120 purpose discards graphite electrode powder and granularity 200-240
The mass ratio that purpose discards graphite electrode powder is 1.8-2.5:1.
As a further solution of the present invention: the relative molecular weight of ultra-high molecular weight polyethylene is 120000-275000.
As a further solution of the present invention: coupling agent includes at least one in silane coupling agent and titanate coupling agent
Kind.
The preparation method of the rotor punching, the specific steps are as follows:
The mass fraction that 4-6 times of its weight is added in tea dust is refluxing extraction in the ethanol solution of 50-66% by step 1
2-3 times and use ultrasonic wave auxiliary, it is 80-120 minutes each, merge ethanol extract and recycle ethyl alcohol, obtains tealeaves and mention
Take liquid；
Step 2, by lemongrass subzero 10 mass fraction to subzero 2 degrees Celsius of dryings to water be 2.4-3.8%, then
It is separately added into the water of 5-7 times of its weight and is decocted 2-3 times at 70-85 degrees Celsius, it is 5-6 hours each, it filters and merges pan-fried
Boil liquid obtains lemongrass decoction liquor；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first production
Object；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball
Ball milling in grinding machine irradiates 5-8 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto,
It stirs evenly and is kept for 10-18 minutes in the electric field of 600-960V, obtain third product；
First product, the second product, third product and coupling agent are uniformly mixed by step 6, are then added in mold simultaneously
And isostatic pressing, it is then solidified under 48-65 degrees Celsius to get finished product is arrived.
As a further solution of the present invention: the power of ultrasonic wave auxiliary is 80-120W, frequency 24-30KHz.
As a further solution of the present invention: the temperature of isostatic pressing is 76-88 degrees Celsius, pressure 4.8-
6.4MPa。
Compared with prior art, the beneficial effects of the present invention are: raw material sources of the present invention are extensive, by different raw materials
Using different preparation processes, different products is obtained, then by different product mixing and compression moulding in a mold, is prepared
Finished product not only have good conductive property, also there is good mechanical property, prospect of the application is wide.
Specific embodiment
The technical solution of the patent is explained in further detail With reference to embodiment.
Embodiment 1
A kind of rotor punching, the raw material including following parts by weight: discarded 23 parts of graphite electrode powder, terephthalic acid (TPA)
6.6 parts, 12.4 parts of glycerine, 3.4 parts of nano-titanium dioxide, 4.2 parts of tea dust, 5 parts of lemongrass, 11.2 parts of phenolic resin, superelevation
22 parts of molecular weight polyethylene, 4.5 parts of coupling agent and 8.6 parts of ethylene propylene diene rubber.Discarded graphite electrode powder includes 90 purpose of granularity
Discarded graphite electrode powder and 220 purpose of granularity discard graphite electrode powder, and 90 purpose of granularity discards graphite electrode powder and granularity
The mass ratio that 220 purposes discard graphite electrode powder is 2.4:1.
The preparation method of the rotor punching, the specific steps are as follows:
Refluxing extraction 2 times is added in the ethanol solution that the mass fraction of 5 times of its weight is 58% simultaneously in tea dust by step 1
And assisted using ultrasonic wave, the power of ultrasonic wave auxiliary is 115W, frequency 27KHz, 95 minutes every time, merges ethanol extract
And ethyl alcohol is recycled, tea extract is obtained；
Step 2, by lemongrass subzero 5 degrees Celsius of dryings to water mass fraction be 2.9%, it is heavy to be then respectively adding its
It measures 6 times of water and is decocted 3 times at 82 degrees Celsius, it is 5-6 hours each, decoction liquor is filtered and merged, lemongrass decoction liquor is obtained；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first production
Object；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball
Ball milling in grinding machine irradiates 6 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto,
It stirs evenly and is kept for 14 minutes in the electric field of 750V, obtain third product；
First product, the second product, third product and coupling agent are uniformly mixed by step 6, are then added in mold simultaneously
And isostatic pressing, it is then solidified under 57 degrees Celsius to get finished product is arrived.
Embodiment 2
A kind of rotor punching, the raw material including following parts by weight: discarded 28.7 parts of graphite electrode powder, terephthalic acid (TPA)
7.3 parts, it is 14.6 parts of glycerine, 4.5 parts of nano-titanium dioxide, 5.2 parts of tea dust, 6.4 parts of lemongrass, 12.8 parts of phenolic resin, super
25.5 parts of High molecular weight polyethylene, 5.8 parts of coupling agent and 10.6 parts of ethylene propylene diene rubber.Opposite point of ultra-high molecular weight polyethylene
Son amount is 120000-186000.Coupling agent uses titanate coupling agent.
The preparation method of the rotor punching, the specific steps are as follows:
Refluxing extraction 3 times is added in the ethanol solution that the mass fraction of 6 times of its weight is 62% simultaneously in tea dust by step 1
And assisted using ultrasonic wave, 114 minutes every time, merge ethanol extract and recycle ethyl alcohol, obtain tea extract；
Step 2, by lemongrass subzero 6 degrees Celsius of dryings to water mass fraction be 3.5%, it is heavy to be then respectively adding its
It measures 7 times of water and is decocted 2 times at 76 degrees Celsius, 5 hours every time, filter and merge decoction liquor, obtain lemongrass decoction liquor；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first production
Object；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball
Ball milling in grinding machine irradiates 5 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto,
It stirs evenly and is kept for 14 minutes in the electric field of 780V, obtain third product；
First product, the second product, third product and titanate coupling agent are uniformly mixed, mould are then added by step 6
In tool and isostatic pressing, the temperature of isostatic pressing are 82 degrees Celsius, then pressure 5.6MPa coagulates at 60 c
Gu to get finished product is arrived.
Embodiment 3
A kind of rotor punching, the raw material including following parts by weight: discarded 32.8 parts of graphite electrode powder, terephthalic acid (TPA)
8.1 parts, it is 15.7 parts of glycerine, 5.2 parts of nano-titanium dioxide, 5.6 parts of tea dust, 7.1 parts of lemongrass, 14.3 parts of phenolic resin, super
27.5 parts of High molecular weight polyethylene, 6 parts of coupling agent and 12.4 parts of ethylene propylene diene rubber.Discarded graphite electrode powder includes granularity 110
Purpose discards graphite electrode powder and 240 purpose of granularity and discards graphite electrode powder, 110 purpose of granularity discard graphite electrode powder and
The mass ratio that 240 purpose of granularity discards graphite electrode powder is 1.9:1.Coupling agent uses silane coupling agent.
The preparation method of the rotor punching, the specific steps are as follows:
Refluxing extraction 2 times is added in the ethanol solution that the mass fraction of 6 times of its weight is 60% simultaneously in tea dust by step 1
And assisted using ultrasonic wave, the power of ultrasonic wave auxiliary is 108W, frequency 28KHz, 110 minutes every time, merges ethyl alcohol and extracts
Liquid and ethyl alcohol is recycled, obtains tea extract；
Step 2, by lemongrass subzero 10 degrees Celsius of dryings to water mass fraction be 3.6%, it is heavy to be then respectively adding its
It measures 7 times of water and is decocted 3 times at 76 degrees Celsius, 5.5 hours every time, filter and merge decoction liquor, obtain lemongrass decoction liquor；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first production
Object；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball
Ball milling in grinding machine irradiates 7 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto,
It stirs evenly and is kept for 12 minutes in the electric field of 760V, obtain third product；
First product, the second product, third product and silane coupling agent are uniformly mixed, mold are then added by step 6
In and isostatic pressing, then under 54 degrees Celsius solidify to get arrive finished product.
Embodiment 4
A kind of rotor punching, the raw material including following parts by weight: discarded 34 parts of graphite electrode powder, terephthalic acid (TPA)
8.5 parts, 16.5 parts of glycerine, 5.5 parts of nano-titanium dioxide, 6 parts of tea dust, 7.5 parts of lemongrass, 14.5 parts of phenolic resin, superelevation
28 parts of molecular weight polyethylene, 6.4 parts of coupling agent and 12.8 parts of ethylene propylene diene rubber.Discarded graphite electrode powder includes 80 purpose of granularity
Discarded graphite electrode powder and 210 purpose of granularity discard graphite electrode powder, and 80 purpose of granularity discards graphite electrode powder and granularity
The mass ratio that 210 purposes discard graphite electrode powder is 2.2:1.The relative molecular weight of ultra-high molecular weight polyethylene is 166000-
275000.Coupling agent includes the mixture of silane coupling agent and titanate coupling agent.
The preparation method of the rotor punching, the specific steps are as follows:
Refluxing extraction 3 times is added in the ethanol solution that the mass fraction of 6 times of its weight is 62% simultaneously in tea dust by step 1
And assisted using ultrasonic wave, the power of ultrasonic wave auxiliary is 110W, frequency 28KHz, 120 minutes every time, merges ethyl alcohol and extracts
Liquid and ethyl alcohol is recycled, obtains tea extract；
Step 2, by lemongrass subzero 7 degrees Celsius of dryings to water mass fraction be 3.6%, it is heavy to be then respectively adding its
It measures 6 times of water and is decocted 3 times at 82 degrees Celsius, 5 hours every time, filter and merge decoction liquor, obtain lemongrass decoction liquor；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first production
Object；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball
Ball milling in grinding machine irradiates 6 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto,
It stirs evenly and is kept for 16 minutes in the electric field of 840V, obtain third product；
First product, the second product, third product and coupling agent are uniformly mixed by step 6, are then added in mold simultaneously
And isostatic pressing, the temperature of isostatic pressing are 85 degrees Celsius, then pressure 5.8MPa solidifies, i.e., at 60 c
Obtain finished product.
Comparative example 1
Except not having tea dust and lemongrass, remaining raw material and preparation method are same as Example 3.
Comparative example 2
Using existing punching as a comparison case 2.
The product of the product of embodiment 1-4 and comparative example 1-2 is tested for the property, test result is shown in Table 1.
Table 1
| Tensile strength | Bending strength | Impact flexibility | Resistivity | |
| Embodiment 1 | 34.6MPa | 48.7MPa | 24.3N*m1/2 | 2.6*106Ω |
| Embodiment 2 | 37.2MPa | 47.3MPa | 27.6N*m1/2 | 3.4*106Ω |
| Embodiment 3 | 31.5MPa | 42.5MPa | 29.3N*m1/2 | 3.1*106Ω |
| Embodiment 4 | 32.4MPa | 44.6MPa | 25.4N*m1/2 | 2.7*106Ω |
| Comparative example 1 | 24.8MPa | 37.2MPa | 16.3N*m1/2 | 6.8*108Ω |
| Comparative example 2 | 19.6MPa | 32.5MPa | 12.6N*m1/2 | 9.4*108Ω |
The product of embodiment 1-4 is above comparison in tensile strength, bending strength and impact flexibility as can be seen from Table 1
The product of example 1-2, the product of embodiment 1-4 are lower than 2 orders of magnitude of product of comparative example 1-2 in resistivity, and electric conductivity is big
It is big to increase, it can satisfy the use demand of people.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of rotor punching, which is characterized in that the raw material including following parts by weight: graphite electrode powder 23-34 parts discarded,
6.6-8.5 parts of terephthalic acid (TPA), 12.4-16.5 parts of glycerine, 3.4-5.5 parts of nano-titanium dioxide, 4.2-6 parts of tea dust, perfume
5-7.5 parts of thatch, 11.2-14.5 parts of phenolic resin, 22-28 parts of ultra-high molecular weight polyethylene, 4.5-6.4 parts of coupling agent and ternary second
Third 8.6-12.8 parts of rubber.
2. rotor punching according to claim 1, which is characterized in that the discarded graphite electrode powder includes granularity
80-120 purpose discards graphite electrode powder and granularity 200-240 purpose discards graphite electrode powder, and granularity 80-120 purpose is discarded
The mass ratio that graphite electrode powder and granularity 200-240 purpose discard graphite electrode powder is 1.8-2.5:1.
3. rotor punching according to claim 1, which is characterized in that opposite point of the ultra-high molecular weight polyethylene
Son amount is 120000-275000.
4. rotor punching according to claim 1, which is characterized in that the coupling agent includes silane coupling agent and titanium
At least one of acid esters coupling agent.
5. a kind of preparation method of the rotor punching as described in claim 1-4 is any, which is characterized in that specific steps are such as
Under:
The mass fraction that 4-6 times of its weight is added in tea dust is refluxing extraction 2-3 times in the ethanol solution of 50-66% by step 1
And it is assisted using ultrasonic wave, it is 80-120 minutes each, merge ethanol extract and recycle ethyl alcohol, obtains tea extract；
Step 2, by lemongrass subzero 10 mass fraction to subzero 2 degrees Celsius of dryings to water be 2.4-3.8%, then respectively plus
Enter the water of 5-7 times of its weight and is decocted 2-3 times at 70-85 degrees Celsius, it is 5-6 hours each, decoction liquor is filtered and merged, is obtained
To lemongrass decoction liquor；
Terephthalic acid (TPA) and glycerine are uniformly mixed by step 3, and esterification is carried out under catalyst, obtain the first product；
Step 4, by discarded graphite electrode powder, tea extract, ultra-high molecular weight polyethylene and ethylene propylene diene rubber in ball mill
Middle ball milling irradiates 5-8 minutes under ultraviolet light, obtains the second product；
Phenolic resin is heated to molten condition by step 5, then nano-titanium dioxide and lemongrass decoction liquor are added thereto, stirring
It uniformly and is kept for 10-18 minutes in the electric field of 600-960V, obtains third product；
First product, the second product, third product and coupling agent are uniformly mixed by step 6, are then added in mold and are waited
Then hydrostatic profile is solidified under 48-65 degrees Celsius to get finished product is arrived.
6. the preparation method of rotor punching according to claim 5, which is characterized in that the function of the ultrasonic wave auxiliary
Rate is 80-120W, frequency 24-30KHz.
7. the preparation method of rotor punching according to claim 5, which is characterized in that the temperature of the isostatic pressing
Degree is 76-88 degrees Celsius, pressure 4.8-6.4MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810921064.3A CN109161080A (en) | 2018-08-14 | 2018-08-14 | A kind of rotor punching and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810921064.3A CN109161080A (en) | 2018-08-14 | 2018-08-14 | A kind of rotor punching and preparation method thereof |
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| WO2010144410A1 (en) * | 2009-06-10 | 2010-12-16 | Ppg Industries Ohio, Inc. | Microporous material having degradation properties and articles prepared therefrom |
| CN102391556A (en) * | 2011-07-01 | 2012-03-28 | 南京航空航天大学 | Crosslinked UHMW-PE (ultra-high molecular weight-polyethylene) friction material for traveling wave type rotating ultrasonic motor, and preparation method and application thereof |
| CN104246123A (en) * | 2012-02-21 | 2014-12-24 | 斯伦贝谢控股有限公司 | Fiber reinforced elastomeric stator |
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2018
- 2018-08-14 CN CN201810921064.3A patent/CN109161080A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101348587A (en) * | 2008-09-01 | 2009-01-21 | 武汉理工大学 | Ultra-high molecular weight polyethylene/graphite nanoplate composite material and preparation thereof |
| WO2010144410A1 (en) * | 2009-06-10 | 2010-12-16 | Ppg Industries Ohio, Inc. | Microporous material having degradation properties and articles prepared therefrom |
| CN102391556A (en) * | 2011-07-01 | 2012-03-28 | 南京航空航天大学 | Crosslinked UHMW-PE (ultra-high molecular weight-polyethylene) friction material for traveling wave type rotating ultrasonic motor, and preparation method and application thereof |
| CN104246123A (en) * | 2012-02-21 | 2014-12-24 | 斯伦贝谢控股有限公司 | Fiber reinforced elastomeric stator |
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Application publication date: 20190108 |