US20190131842A1 - Method for producing a corona shield, fast-curing corona shield system, and electric machine - Google Patents
Method for producing a corona shield, fast-curing corona shield system, and electric machine Download PDFInfo
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- US20190131842A1 US20190131842A1 US16/191,524 US201816191524A US2019131842A1 US 20190131842 A1 US20190131842 A1 US 20190131842A1 US 201816191524 A US201816191524 A US 201816191524A US 2019131842 A1 US2019131842 A1 US 2019131842A1
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- initiators
- curing
- corona shield
- cured
- crosslinking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/002—Inhomogeneous material in general
- H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
- H02K15/105—Applying solid insulation to windings, stators or rotors to the windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/30—Windings characterised by the insulating material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
- H02K9/18—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle wherein the external part of the closed circuit comprises a heat exchanger structurally associated with the machine casing
Definitions
- the invention relates to a method for producing a corona shield, a fast-curing corona shield system, and an electric machine.
- FIGS. 2, 3 schematically show the procedure when applying a corona shield
- the cooling gas flow coming from the coolers 16 is divided in the turbine-side end region 6 .
- One partial flow serves for cooling the turbine-side stator winding overhang 28 A and the other partial flow is forwarded via the cooling gas duct 36 A to the excitation-side stator winding overhang 28 B and divided again.
- One part serves for cooling the stator winding overhang 28 B and flows back again from there as hot gas via the air gap 26 .
- the other part is conducted through the cooling gas ducts 36 C of the laminate stack 30 and emerges as hot gas in the turbine-side end region 6 and is fed to the coolers 16 .
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
- Laminated Bodies (AREA)
Abstract
The corona shield can be applied in electric machines in a faster manner by using radiation-cured materials.
Description
- The present application is a divisional under 37 C.F.R. § 1.53(b) of prior U.S. patent application Ser. No. 14/365,158, filed Jun. 13, 2014, which is a 35 U.S.C. § 371 national phase conversion of PCT/EP2011/072942, filed Dec. 15, 2011. The entire content of each of these applications is incorporated in full by reference herein. The PCT International Application was published in the German language.
- The invention relates to a method for producing a corona shield, a fast-curing corona shield system, and an electric machine.
- A corona shield is used in many electrical applications, in particular in generators, as described in EP 1 995 850 B1.
- In order to avoid partial discharges, the main insulation of generator winding bars at operating voltages of a few kilovolts has to be shielded from cavities and detachments by an inner and an outer conducting layer. The electric field strength is reduced in the main insulation proceeding from the inner potential grading 10 (
FIG. 1 ) (IPG) in the radial direction as far as the outer corona shield 13 (FIG. 1 ) (OCS). At the end of the generator winding bar, in the region of the exit point of the winding bars from the stator laminate stack, the OCS ends, while the main insulation is continued in the direction of the bar end. This arrangement constitutes a typical sliding arrangement having an extremely low partial discharge inception voltage. In this region the electric field also has, in addition to the radial component, a strong nonlinear tangential component parallel to the insulating material surface/interface. The highest field strength occurs at the end/edge of the OCS. Therefore, it is necessary to provide for a field control at the edge of the outer corona shield and for an increase in dielectric strength in the vicinity of the exposed main insulation. This is usually achieved by the production of an overhang corona shield 16 (FIG. 1 ). In order to suppress creeping discharges, use is usually made of resistive potential gradings by means of semiconducting varnishes or tapes predominantly on the basis of silicon carbide or other electrically semiconducting fillers. - The aim of the potential grading is to make more uniform, and ideally to linearize, the tangential potential reduction along the insulating material surface. This is achieved if the absolute value of the voltage drop per unit length is always the same. A resistance per unit length that is voltage-dependent and location-dependent in the axial direction is produced for this purpose.
- In this case, the time duration for sufficiently curing and solidifying hitherto commercial materials is very long particularly in the case of varnishes, but also in the case of tapes, since across a plurality of work shifts a plurality of layers of varnish have to be applied and between applications it is necessary to wait for a certain time interval in order that the subsequent layer can be applied again by overcoating.
- The overhang corona shield is realized nowadays either by single- or multi-ply wrapping with electrically semiconducting tapes or by applying one or a plurality of layers of an electrically semiconducting varnish.
- The semiconducting tapes usually consist of an electrically nonconductive carrier material (e.g. polyester nonwoven, polyester fabric or glass fabric) and a reaction resin (e.g. epoxidized phenol novolaks, often accelerated by means of dicyandiamine) in a prereacted stage (B-stage). For complete curing, tapes of this type have to be cured for 2, hours at approximately 165° C. or for up to 12 hours at only 120° C. Silicon carbide is usually used as filler nowadays, wherein the average grain size determines the resulting electrical resistance of the tape.
- Semiconducting varnishes are typically solvent-based systems such as phenolic resins comprising semiconducting or semiconducting-functionalized fillers.
- At room temperature, a time of a plurality of hours (up to 4 or more) is required here to obtain overcoatability. Since it is often necessary to produce up to five layers one above another, this is a time-consuming process.
- The high drying time follows from the required high solvent content (approximately up to 30%). This must be rejected, however, on account of environmental protection and occupational safety aspects. In this case there is also the risk of initiating a hidden defect. Present-day systems are additionally restricted to low heat stability classes.
- Ready-mixed varnishes are offered commercially only for specific resistance ranges. Further resistance ranges are required, however, which are produced manually by dedicated mixing.
- However, these mixtures have specific disadvantages, such as subsidence/segregation of the filler, the risk of an incorrect mixture, poorer processing properties (e.g. coatability).
- Hitherto there have been virtually no satisfactory approaches for accelerating the processing by means of significant reductions of the curing times. The curing times are the slowest step in this manufacturing stage and are thus a speed-determining factor for manufacture.
- Therefore, it is an object of the invention to solve the above problem.
- The object is achieved by means of a corona shield disclosed herein, a method disclosed herein and an electric machine as disclosed herein.
- In the figures:
-
FIG. 1 shows one end of a generator winding bar (prior art), -
FIGS. 2, 3 schematically show the procedure when applying a corona shield, -
FIGS. 4-6 show various exemplary embodiments of the invention, -
FIG. 7 shows a generator. - The figures and the description merely illustrate exemplary embodiments of the invention.
-
FIG. 1 shows one end of a generator winding bar. Such an end has anelectrical conductor 7, around which an inner potential grading (IPG) 10 is present. Situated around the latter is an outer corona shield (OCS) 13, to one end of which anoverhang corona shield 16 is attached. - A
stator laminate stack 4 has theconductor 7 arranged in it. If appropriate, agrounding 19 is present at the end. - The invention for the corona shield consists in chemical formulations which serve as varnishes or as matrix materials in tape systems.
- Said corona shield can be used as an
overhang corona shield 16 in rotary electric machines (generators, motors, . . . ), cable end seals or other systems in which a controlled guided potential reduction is necessary from a design standpoint. - The corona shield preferably comprises a filling consisting of a semiconducting filler that enables the system to be used as an overhang corona shield.
- These fillings are preferably silicon carbide and/or graphite. In this case, fillings of 30% by weight to 90% by weight are advantageously used.
- The matrix material for the curable material is preferably monomers whose crosslinking is preferably carried out by one or a plurality of initiators which emit reactive species or undergo transition to an excited state which start/starts the crosslinking.
- Such initiators are activated by electromagnetic radiation, which can be for example in the spectral range of infrared, X-ray, ultraviolet and/or gamma radiation.
- In addition, secondary accelerators can be used, which can vary or amplify the excitation of the initiators in the wavelength range.
-
FIG. 2 shows asubstrate 40, on which such a curable mixture, which is then used for the corona shield, is applied in the form of alayer 70. - As a result of the action of radiation, illustrated here as a wave, the
layer 70 cures and forms the curedlayer 70′. - A comparable situation is illustrated in
FIG. 3 , wherein thelayer 70 is cured by a temperature increase (+T). - The procedure in accordance with
FIGS. 2 and 3 can be combined. This can preferably constitute a homogeneous mixture of the materials fromFIGS. 2, 3 (not illustrated). -
FIG. 4 shows alayer 70 to be cured or a curable corona shield in which different types ofinitiators initiators layer 70 or in the corona shield. - During the irradiation it is possible to use a wide wavelength range or a plurality of selective wavelengths which can penetrate differently over the depth h of the
layer 70. In this regard, besides theinitiators 51″ that are further away from theirradiation surface 60 and, if appropriate, no longer have an effect or have a lesser effect than directly at theirradiation surface 60, types ofinitiators 53″ can be concomitantly present also in the lower region near thebase 61, where a wavelength (or wavelength range) can penetrate more deeply as far as thebase 61 and is particularly effective for theinitiators 53″. - In
FIG. 5 , in contrast toFIG. 4 , the different types ofinitiators layer 70 selectively over the depth h. The different types ofinitiators irradiation surface 60 there are arranged the types ofinitiators 51 for which a wavelength can penetrate well as far as this region. - In a second or central region of the
layer 70, types ofinitiators 52 are present for which a further or second wavelength (wavelength range) can penetrate right into the central region of thelayer 70 and, in the lower region of thelayer 70, only initiators 53 are present for which a further or third wavelength can penetrate well as far as thebase 61. - Likewise, near the base 61 or the region relatively far away from the
irradiation surface 60, the concentration of one or more initiators can be increased in order to compensate for the lower intensity of the radiation (concentration gradient (not illustrated)). -
FIG. 6 shows a further exemplary embodiment of the invention. Here, in thelayer 70, different types ofinitiators layer 70. However, the types ofinitiators 51 react to electromagnetic radiation, and, in the deeper region of thelayer 70, where the ability of rays to penetrate is poorer,initiators 54 that react to heat are present (inhomogeneous combination ofFIGS. 2, 3 ). - A graded transition of the concentration of the types of initiators is preferably conceivable.
- The heating of lower layer regions can be realized in a simple manner, in contrast to introducing electromagnetic radiation in the depth region of a solid material, since electromagnetic radiation is always absorbed in a solid material.
- The corona shield comprises a filling (
FIGS. 2-6 ) consisting of a semiconducting filler that enables the system to be used as an overhang corona shield. - The matrix material for the curable material is preferably monomers whose crosslinking is preferably carried out by one or a plurality of initiators which emit reactive species or undergo transition to an excited state which start/starts the crosslinking.
- Such initiators are activated by electromagnetic radiation, which can be for example in the spectral range of infrared, X-ray, ultraviolet and/or gamma radiation.
- In addition, secondary accelerators can be used, which can vary or amplify the excitation of the initiators in the wavelength range.
- In the case of the initiation with the aid of ultraviolet radiation, the activation can be effected for example by means of a free radical or cationic crosslinking mechanism. The activation of such initiators is limited to the type of accelerator correspondingly chosen and is effected exclusively by electromagnetic radiation.
- The use of a “dual cure” option is also conceivable, that is to say the admixture of a further initiator, which allows crosslinking by application of temperature and thus allows a selection of the manner of activation for particular cases of use.
- The accelerators to be activated by electromagnetic radiation are chosen such that transmission of radiation and activation of the accelerators in the depth are possible. Systems that are reactive in the ultraviolet spectral range are usually chosen here. These systems are mostly very clearly delimitable from thermally curing systems, since customary photoinitiators react only to incident light. In this case, the concentration of the most reactive accelerator will be correspondingly low, such that the incident radiation is not completely absorbed directly at the surface.
- Accordingly, it is possible to provide a combination of a plurality of initiators which enable deep transmission of radiation and deep curing in this way. It is thus possible to cure relatively thick layers of up to one millimeter. A system catalyzed in this way can likewise be initiated and cured in filled form with a customary varnish layer thickness of up to 0.5 mm since the formulation of the initiators has the effect that curing of the matrix is continued even in the shadow region of the filler particles.
- If one percent initiator has been included in a radiation-curing chemical formulation, for example, initiators having a high efficiency, i.e. a high photon yield, must already be chosen even in the case of slightly filled systems.
- In the case of the cationic photoinitiator bis[4(diphenylsulfonium)phenyl]sulfide bishexafluoroantimonate, the ratio of incident phonons to the production of reactive particles is almost equal to one. This has the consequence that the surface cures at high speed and the initiator traps/absorbs all phonons almost already at the surface.
- However, the formulation can also be fashioned in such a way that a plurality of initiators in combination are used instead of one initiator. A percentage increase in the total content of the initiator is not absolutely necessary in this case. The initiators are chosen in this case such that each absorbs a specific wavelength segment of the UV light.
- By way of example, the
photoinitiator - By means of a synergist, the excitation can likewise be forced in the case of intervening wavenumbers, such that virtually the entire UV spectrum can be effectively utilized for curing. As a result, greatly filled materials can then also be fully cured. In this case, the curing can be initiated for example by an F-emitter or G-emitter or by a series connection comprising both emitters.
- The curing of highly filled materials has never yet been satisfactorily achieved using electromagnetic radiation. Therefore, hitherto there has also never been the possibility of realizing such a fast-curing varnish which at the same time is provided to a high degree with a partly conductively functionalized filler and can thus be used as an overhang corona shield.
- This can now be achieved by the combination of a correspondingly depth-reactive UV resin with the functionalized filler.
- The skillful combination of photoinitiators is very important in such a system. In order to be able to utilize the wavelength spectrum optimally, different photoinitiators are combined with one another. They react to different excitation wavelengths and enable the partial transmission of the radiation into the depth of the system. Even if a filler traps large parts of the radiation, nevertheless full curing can still be achieved in the depth. Ultimately, a good hardness and also adhesion are thus achieved. By adding further components, so-called additives, it is possible to set specific properties such as flexibility and adhesion.
- If 2,4,6-trimethylbenzoyldiphenylphosphine oxide (TPO) initiates a free radical curing mechanism, formulations which are started by means of a cationic reaction mechanism are also conceivable, in principle. Thus, customary epoxy resins can also be formulated and well-crosslinked layer systems can thus be achieved. By addition of phosphorus compounds, it is additionally possible to reduce the self-extinguishment in the case of fire.
- Examples of a thermal and a photosensitive initiator include bis[4(diphenylsulfonium)phenyl]sulfide bishexafluoroantimonate, also miscible for “dual cure” applications;
claim 4 reveals a likewise only exemplary portfolio of matrix molecules. It can be discerned therefrom that radiation-curing systems, not only in the choice of their initiators, synergy lists, stabilizers and further additives, but also in the choice of the actual reaction resin matrix, are totally free and this affords a very good possibility of elaborating formulations having specified properties. - In this case, the systems that can be utilized cover virtually every conceivable industrially available group of chemically crosslinkable molecules.
- The evident advantages of the new formulation are:
-
- As a result of the curing by means of radiation, the time until the next overcoating can be reduced to approximately 180 seconds, whereas conventional systems in use require approximately 4 hours curing time per coated ply. In other words, the expenditure until the completion of the overhang corona shield, e.g. of a generator bar, is reduced from several days and distribution over several operating work shifts to a few minutes.
- As a result of the adjustable viscosity, the varnish can be formulated as both sprayable and spreadable.
- The system can be set to have very low flammability and thus fulfill UL-94 V-Q and further combustibility restrictions and standards.
- By choosing a urethanized acrylate as matrix material, it is possible for example to increase the thermal resistance and thus the heat stability class (HSC) to up to 180° C.
- In addition, the scratch resistance is improved.
- Virtual or complete freedom from solvents can be achieved.
- In accordance with
FIG. 7 , a rotary machine arrangement, in particular agenerator arrangement 2, extends along alongitudinal axis 4 from a turbine-side end region 6 to an excitation-side end region 8. Thegenerator arrangement 2 has ahousing 10. A coolingdevice 12 is arranged in the turbine-side end region 6. To be precise, twocoolers 16 and a compressor in the form of afan 18 having afan hub 20 are arranged in acooler head 14, which is a part of thehousing 10. Thefan hub 20 is seated on arotor 22 extending along thelongitudinal axis 4 through thegenerator arrangement 2. Theactual generator region 23 is arranged after thecooling device 12 in the direction of thelongitudinal axis 4. In this region, therotor 22 is surrounded by astator 24 with the formation of anair gap 26. Thestator 24 has a stator winding having a turbine-sidestator winding overhang 28A and having an excitation-sidestator winding overhang 28B. A so-calledlaminate stack 30 is arranged between the twostator winding overhangs stator 24, therotor 22 has a turbine-siderotor winding overhang 32A and an excitation-siderotor winding overhang 32B. - On account of the high power density that is customary in turbogenerators, it is necessary to cool the
generator arrangement 2 in thegenerator region 23. In this case, thestator winding overhangs rotor winding overhangs generator region 23, the latter has acooling system 34 supplied with cooling gas by the coolingdevice 12. Thecooling system 34 has a number of coolinggas ducts 36A-D, 38 via which the cooling gas is guided in a circulation. In this case, a firstcooling gas duct 36A extends in the axial direction and is arranged between thestator 24 and thehousing 10. A secondcooling gas duct 36B is formed by theair gap 26. Further coolinggas ducts 36C extending in the axial direction lead through thelaminate stack 30. In order to cool therotor 22, a coolinggas duct 36D leads through said rotor. The cooling gas flow in thegenerator region 23 and in thecooling device 12 is indicated in each case by arrows, wherein the dashed arrows indicate the flow path of the cold cooling gas and the solid arrows indicate the flow path of the heated cooling gas (hot gas). - In order to cool the
stator winding overhangs coolers 16 is divided in the turbine-side end region 6. One partial flow serves for cooling the turbine-sidestator winding overhang 28A and the other partial flow is forwarded via the coolinggas duct 36A to the excitation-sidestator winding overhang 28B and divided again. One part serves for cooling thestator winding overhang 28B and flows back again from there as hot gas via theair gap 26. The other part is conducted through the coolinggas ducts 36C of thelaminate stack 30 and emerges as hot gas in the turbine-side end region 6 and is fed to thecoolers 16. In order to cool therotor winding overhangs gas duct 36D of therotor 22 both from the turbine-side end region 6 and from the excitation-side end region 8. A partial flow of the cooling gas flows through the respectiverotor winding overhangs air gap 26 as hot gas and fed to thecoolers 16. The remaining partial flow is guided further through therotor 22 in the coolinggas duct 36D, to be precise in such a way that the cooling gas from the tworotor winding overhangs air gap 26 for instance in thecentral region 38 of thegenerator region 23.
Claims (20)
1. A method for producing a corona shield for electric machines comprising applying a curable material to the machine for shielding the electric machine; and curing the material on the machine by electromagnetic radiation.
2. The method as claimed in claim 1 , further comprising providing an electrically semiconducting filler in the curable material before the curing thereof.
3. The method as claimed in claim 2 , wherein the electrically semiconducting filler comprises silicon carbide or graphite.
4. The method as claimed in claim 2 , wherein a proportion of the semiconducting filler in the curable material is 30% by weight to 90% by weight.
5. The method as claimed in claim 1 , wherein the curable material that is cured by means of electromagnetic radiation comprises bisphenol A diglycidyl ether (BADGE), bisphenol F diglycidyl ether (BFDGE), 3,4-epoxycyclohexylmethyl-3′,4′-epoxy-cyclohexane carboxylate, phenol novolak, acrylate, urethane and/or ether.
6. The method as claimed in claim 1 , further comprising effecting a crosslinking by one or a plurality of initiators.
7. The method as claimed in claim 6 , wherein the initiator is operable to effect a crosslink as a result of a temperature increase.
8. The method as claimed in claim 1 , further comprising using secondary accelerators to vary the excitation of the initiators in the wavelength range.
9. The method as claimed in claim 1 , further comprising effecting the crosslinking of the curable material by free radical or cationic crosslinking mechanisms.
10. The method as claimed in claim 6 , further comprising using at least two different types of the initiators, wherein at least one type of the initiators brings about a crosslinking by means of heat and the other type of the initiators brings about a crosslinking by means of electromagnetic radiation.
11. The method as claimed in claim 6 , further comprising using a plurality of different initiators, which are activated in a wavelength-specific manner.
12. The method as claimed in claim 6 , wherein bis[4(diphenylsulfonium)phenyl]sulfide bishexafluoroantimonate is used as the initiator.
13. The method as claimed in claim 6 , using 2,4,6-trimethylbenzoyldiphenylphosphine oxide as the initiator.
14. The method as claimed in claim 6 , further comprising varying the initiators along the thickness of the curing material that is applied and is to be cured.
15. The method as claimed in claim 6 , wherein the compositions of at least one of the curing material to be cured and of the initiators are varied in the applied material to be cured over the thickness of the material to be cured.
16. The method as claimed in claim 6 , wherein the cured material in the corona shield has an irradiation surface which is exposed to be irradiated and has a base on an opposite side of the irradiation surface from the irradiation surface, and the method further comprising setting the concentration of the initiators in a region of an irradiation surface of the curing material to be lower in concentration than at the base of the curing material opposite the irradiation surface.
17. The method as claimed in claim 1 , wherein the curing is by UV radiation.
18. The method as claimed in claim 6 , further comprising using monomers as the curable material.
19. The method as claimed in claim 14 , wherein the thickness of the curing material is varied on account of a wavelength-specific activation of the initiators corresponding to variations of the composition of the initiators or of the concentration of the initiator or initiators.
20. A method for producing a corona shield for an electric machine comprising applying a curable material to a part of the machine for shielding the electric machine; and curing the material on the machine by heat.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US16/191,524 US20190131842A1 (en) | 2011-12-15 | 2018-11-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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PCT/EP2011/072942 WO2013087112A1 (en) | 2011-12-15 | 2011-12-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
US201414365158A | 2014-06-13 | 2014-06-13 | |
US16/191,524 US20190131842A1 (en) | 2011-12-15 | 2018-11-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
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US14/365,158 Division US10186924B2 (en) | 2011-12-15 | 2011-12-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
PCT/EP2011/072942 Division WO2013087112A1 (en) | 2011-12-15 | 2011-12-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
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US20190131842A1 true US20190131842A1 (en) | 2019-05-02 |
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US14/365,158 Expired - Fee Related US10186924B2 (en) | 2011-12-15 | 2011-12-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
US16/191,524 Abandoned US20190131842A1 (en) | 2011-12-15 | 2018-11-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
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US14/365,158 Expired - Fee Related US10186924B2 (en) | 2011-12-15 | 2011-12-15 | Method for producing a corona shield, fast-curing corona shield system, and electric machine |
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US (2) | US10186924B2 (en) |
EP (1) | EP2764519B1 (en) |
CN (1) | CN103999165B (en) |
ES (1) | ES2558859T3 (en) |
WO (1) | WO2013087112A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3764523A1 (en) * | 2019-07-10 | 2021-01-13 | Airbus Defence and Space GmbH | Electric machine with integrated cooling system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US566A (en) * | 1838-01-09 | Cobtsteuctioit of cooking-stoves | ||
US886A (en) * | 1838-08-18 | Mill eor grinding or bruising flaxseed and other substances | ||
US5319276A (en) * | 1992-06-10 | 1994-06-07 | Asea Brown Boveri Ltd. | Corona-shielding arrangement for the stator winding of an electric machine |
US5466492A (en) * | 1993-09-11 | 1995-11-14 | Herberts Gmbh | Process for fixing wound items with radically polymerisable compounds |
US6579566B1 (en) * | 1994-03-16 | 2003-06-17 | Vantico Inc. | One-component epoxy resin system for trickle impregnation and hot dip rolling |
US6645886B1 (en) * | 1998-08-28 | 2003-11-11 | Siemens Aktiengesellschaft | Glow protection band |
US20040132956A1 (en) * | 2001-01-18 | 2004-07-08 | Toshikazu Hamao | Thermosetting resin composition for vacuum, method for manufacturing the same, and vacuum device using the same |
US20100080892A1 (en) * | 2008-09-30 | 2010-04-01 | O'brien Michael J | Varnish compositions for electrical insulation and method of using the same |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3824683A (en) * | 1973-08-13 | 1974-07-23 | Gen Electric | Method for reducing corona in a dynamoelectric machine |
JPS5681054A (en) * | 1979-12-05 | 1981-07-02 | Hitachi Ltd | Corona shielding method |
US4999136A (en) | 1988-08-23 | 1991-03-12 | Westinghouse Electric Corp. | Ultraviolet curable conductive resin |
ES2150977T3 (en) | 1993-08-09 | 2000-12-16 | Vantico Ag | NEW (MET) ACRYLATES CONTAINING URETANIAN GROUPS. |
CA2129073C (en) | 1993-09-10 | 2007-06-05 | John P. Kalinoski | Form-in-place emi gaskets |
US20010028953A1 (en) | 1998-11-16 | 2001-10-11 | 3M Innovative Properties Company | Adhesive compositions and methods of use |
JPH1041122A (en) * | 1996-07-19 | 1998-02-13 | Toshiba Corp | Electromagnetic device |
US6103640A (en) | 1997-09-12 | 2000-08-15 | Bridgestone Corporation | Electromagnetic-wave shielding and light transmitting plate |
US6261680B1 (en) * | 1999-12-07 | 2001-07-17 | Hughes Electronics Corporation | Electronic assembly with charge-dissipating transparent conformal coating |
US6697712B1 (en) * | 2000-04-24 | 2004-02-24 | Utilx Corporation | Distributed cable feed system and method |
US7208192B2 (en) * | 2002-05-31 | 2007-04-24 | Parker-Hannifin Corporation | Thermally or electrically-conductive form-in-place gap filter |
DE10227227A1 (en) * | 2002-06-18 | 2004-01-22 | Siemens Ag | corona shielding |
US7875347B2 (en) | 2003-12-29 | 2011-01-25 | General Electric Company | Composite coatings for groundwall insulation, method of manufacture thereof and articles derived therefrom |
DE102004008365A1 (en) | 2004-02-20 | 2005-09-08 | Altana Electrical Insulation Gmbh | Process for producing coated electrical wires |
JP2005272702A (en) | 2004-03-25 | 2005-10-06 | Jsr Corp | Curable composition and cured material and laminate made thereof |
CN101189686B (en) * | 2005-05-04 | 2013-01-02 | Abb研究有限公司 | Electric insulation material, an electric device and a method for producing an electric insulation material |
US20080033083A1 (en) | 2006-08-01 | 2008-02-07 | Gang Li | Flame retardant thermoplastic compositions having emi shielding |
CN101535406A (en) | 2006-08-01 | 2009-09-16 | 沙伯基础创新塑料知识产权有限公司 | Flame retardant thermoplastic compositions having EMI shielding |
EP1995850B1 (en) | 2007-05-25 | 2010-06-30 | Siemens Aktiengesellschaft | Glow protector |
WO2009158045A1 (en) | 2008-06-23 | 2009-12-30 | Parker-Hannifin Corporation | Emi shielding materials |
JP5506812B2 (en) | 2008-11-12 | 2014-05-28 | ビーエーエスエフ ソシエタス・ヨーロピア | Radiation curable coating material |
JP2010155974A (en) | 2008-12-01 | 2010-07-15 | Nitto Denko Corp | Acrylic pressure sensitive adhesive sheet, method of manufacturing the same, and laminated constitution |
EP2464706B1 (en) | 2009-08-12 | 2015-09-02 | Parker Hannifin Corp. | Fully-cured thermally or electrically-conductive form-in-place gap filler |
FR2965268B1 (en) * | 2010-09-29 | 2012-09-21 | Hutchison | NEW COMPOSITION FOR TRANSPARENT CONDUCTIVE FILM |
-
2011
- 2011-12-15 ES ES11802049.4T patent/ES2558859T3/en active Active
- 2011-12-15 CN CN201180075589.6A patent/CN103999165B/en not_active Expired - Fee Related
- 2011-12-15 WO PCT/EP2011/072942 patent/WO2013087112A1/en active Application Filing
- 2011-12-15 US US14/365,158 patent/US10186924B2/en not_active Expired - Fee Related
- 2011-12-15 EP EP11802049.4A patent/EP2764519B1/en not_active Not-in-force
-
2018
- 2018-11-15 US US16/191,524 patent/US20190131842A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US566A (en) * | 1838-01-09 | Cobtsteuctioit of cooking-stoves | ||
US886A (en) * | 1838-08-18 | Mill eor grinding or bruising flaxseed and other substances | ||
US5319276A (en) * | 1992-06-10 | 1994-06-07 | Asea Brown Boveri Ltd. | Corona-shielding arrangement for the stator winding of an electric machine |
US5466492A (en) * | 1993-09-11 | 1995-11-14 | Herberts Gmbh | Process for fixing wound items with radically polymerisable compounds |
US6579566B1 (en) * | 1994-03-16 | 2003-06-17 | Vantico Inc. | One-component epoxy resin system for trickle impregnation and hot dip rolling |
US6645886B1 (en) * | 1998-08-28 | 2003-11-11 | Siemens Aktiengesellschaft | Glow protection band |
US20040132956A1 (en) * | 2001-01-18 | 2004-07-08 | Toshikazu Hamao | Thermosetting resin composition for vacuum, method for manufacturing the same, and vacuum device using the same |
US20100080892A1 (en) * | 2008-09-30 | 2010-04-01 | O'brien Michael J | Varnish compositions for electrical insulation and method of using the same |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3764523A1 (en) * | 2019-07-10 | 2021-01-13 | Airbus Defence and Space GmbH | Electric machine with integrated cooling system |
US20210013768A1 (en) * | 2019-07-10 | 2021-01-14 | Airbus Operations Gmbh | Electric machine with integrated cooling system |
Also Published As
Publication number | Publication date |
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WO2013087112A1 (en) | 2013-06-20 |
CN103999165A (en) | 2014-08-20 |
EP2764519B1 (en) | 2015-10-28 |
US20140327334A1 (en) | 2014-11-06 |
CN103999165B (en) | 2016-12-07 |
US10186924B2 (en) | 2019-01-22 |
EP2764519A1 (en) | 2014-08-13 |
ES2558859T3 (en) | 2016-02-09 |
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