Mica-loaded tape with maximum mica content

FIELD: physics; electricity.

SUBSTANCE: fibre glass layer contains out-of-wind fibre glass. It can be woven fibre glass fabric. The material is applied mainly for covering electric conductor, such as wire applicable for high-temperature environments and coils for high-voltage electric motors and generators.

EFFECT: possibility of production of thinner insulation material without deterioration of mechanical or electric properties.

19 cl, 3 tbl, 3 ex

 

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority in accordance with the provisional application U.S. No. 60/580,489, filed on June 16, 2004, the contents of which are incorporated into this description by reference.

The LEVEL of TECHNOLOGY

Insulated electrical conductors in electrical installations has undergone significant improvement after the development of the first machines of the nineteenth century. Because there is a need to provide larger and more efficient machines for industrial and commercial applications, insulation system used by designers, has evolved to provide greater withstand strength and, in addition, to occupy less space in the car. It must be remembered that most electric cars are made of electrically conductive material, magnetic material and the insulation system. Essentially magnetic material and conductive material are two of the active material, which define the operating characteristics of the machine and load capacity, and insulation is present only to ensure that electricity only flows in the pre-defined channels. Thus, the required isolation must occupy a minimum of space and, in addition, to provide the necessary isolation between adjacent Elektricheskie conductors and between conductors and any adjacent materials, which is attached to the vessel capacity.

In the past electric cars have traditionally used lacquer, enamel compounds or fiberglass winding to cover individual conductors required primary strands or insulation from round to round" individual conductors. Especially in rotary machines of the above-mentioned conductors was rolled up in a coil, each coil was provided by the second isolation environment, and this isolation was in the form of insulating tape or wrapper, wrapped around a group of separate conductors, which were formed in the pre-defined form with the formation of the coil. Varnishes, which functioned satisfactorily in the early cars with low voltage was gradually replaced by enamel, and most recently, polymeric materials such as polyesters, polyetherimide, poliefirimidnoy and polyimides though mentioned only a small number of commercially available coatings Explorer.

The coil insulation evolved from cotton ribbon, wrapped layers method "edge to edge"to provide the necessary insulation, bitumen isolate, which included wrapping overlap reel tape coated with a compound, based on the bitumen, which is then covered with a layer of mica flakes. Flakes of mica provided isolatio is strong resistance to the phenomenon, commonly known as "corona discharge", which tends to be more difficult to resolve, as increased working voltage rotating machines. Gradually, fiberglass tapes were used as media for flakes of mica and many polymeric materials used to create the adhesion necessary to keep the flakes of mica in place on the tape. Typically, these tapes are known as mica tapes.

In one method of isolating the coil is in the winding coil of traditional technologies navipane overlap and subsequently placing it in the device forming the coil. How integrirovania vacuum and pressure (VPI) was used for impregnating the tape coil insulating material, such as uncured polymeric material to fill all voids and cracks when Perekrestok isolation, while the coil was heated for curing composite coil and insulation on the polymerization method. An alternative way to isolate the coils of electrical machines consists in winding the coil or lived layered film, which is abundantly covered with a polymer resin "B"-stage in the standard way edge-to-edge, up until not deposited the desired number of turns on the coil or conductor and then the coil was affected by heat and pressure when the fact is the temperature value from about 160° C to approximately 180°C to ensure solidification of the polymer material of the coil or core. During the operation of the heating and pressing the viscosity of the polymeric material "B"-stage first fell, and the excess resin is squeezed out of the coil pressure used to make the coil in its final form.

Mica tape is different in composition, according to which was applied the method for the production of an isolated coil. How VPI used tape, which had a relatively low content of resin. The tape was very flexible, not prone to adhesion and dry, and possessed unusual capacity for adsorption. As a result, they were used for high-voltage machines (up to 1000 MVA). To obtain the tapes, which are able to integrirovaniju, sheet mica can impregnants epoxy resin in the solvent environment, and then connect with the base. Alternative solid resin can be napisana or mica cloth or directly onto the canvas, and then the two components can work together to form the laminate under the action of pressure and heat. The content of the resin is typically between 3 and 25%based on the total weight of the tape. In case of no-VPI ways tapes usually were concocted from a sheet of mica, which were carefully pregnenolone epoxy resin. Tar, as a rule, were between 25 and 50% to the total mass of the tape. During the production of epoxy resin was partially aterials on stage B.

In generators, high voltage, such as used to generate electricity or high voltage motors increasing requirements for withstand voltage of any of this material for isolation lead to the increase of the insulation thickness and the number of wound layers. However, as the thickness increases, the heat transfer between the winding and the laminated core of the stator is deteriorating and at the same time, this leads to problems when dissipate excess heat. Moreover, at any given geometry of the stator winding shall be designed with a small cross-section of the conductor, leading thus to a decrease of the generated power. Accordingly, one purpose of the invention was to provide improved insulating material, which has improved dielectric parameters (withstand voltage), and improved thermal parameters (thermal resistance).

The INVENTION

Unexpectedly it was found that the composite mica/glass-based layer of fiberglass, made from non-twisted yarn has superior insulating properties, if used in large electrical machines or for insulation of the wire at a very high temperature. In about the nom aspect, the present invention relates to electrical insulating material, which includes a layer of fiberglass and a layer of mica, where the fiberglass includes non-twisted thread.

DETAILED description of the INVENTION

The present invention relates to insulating material which includes a layer of fiberglass and a layer of mica, located on the layer of fiberglass, with a layer of glass fiber consists of non-twisted filaments. The layer of fiberglass can be fiberglass, in particular a woven fabric, or may be a layer of parallel optic fibers or lived. In a preferred embodiment, the insulating material is a mica tape.

Glass for use in insulating material of the present invention is composed of a non-twisted, also called "free from twists" and "zero-twist" fiberglass yarn as described in U.S. patent No. 6581257 ( Burton et al.), the content of which is incorporated into this description by reference in full.

The first patent describes a method for producing a primary beam of non-twisted lived. In the traditional way, which leads to a twisted yarn, the holder of a package of thread is fixed so that the thread revolves around the external or internal circumference of the package, and the twisting is passed to the thread. In im is e according to the patent Burton packing thread was rotated with a linear speed of operation. Thread poisoned by way of the Bay thread does not rotate and is not reported by the twisting of the thread. This thread can be applied to a woven fabric that is thinner and more durable, at the same time, resulting in products with improved electrical and thermal properties compared to traditional fiberglass, made from twisted thread.

Non-twisted thread is more like a ribbon than like a rope, as in the case of traditional twisted threads, and leads to a flatter, thinner fabric with a smooth surface. The fibers that make up the thread, are usually only about 5 microns in diameter. Method for producing fabric from the non-twisted yarn is also different from the traditional ways to weave fiberglass yarn, in which the final finishing coat of fabric can be applied when the fibers are unreeled from the package. This leads to a smoother fabric that is at least as strong as the tissue is made of traditional threads.

The layer of fiberglass is typically a woven fiberglass, but non-woven fabrics can be used when the fabric is quite durable and thin. The fibers or strands composed of non-twisted yarn, can also be applied in a layer of fiberglass; in this case, the insulating material of the present invention represents the t of a mica tape fiber type. Woven fabric which is particularly well-suited for use in insulating materials of the present invention, is available from Dielectric Solutions, East Butler, Pennsylvania under the trademark GlasFab® Direct as fabric varieties 1297 1299 or.

Electrical insulating materials, and especially mica tape is made of non-twisted glass fiber yarn, provide significant benefits that are not easily achieved with traditional twisted threads, particularly as insulation for coils of high-temperature high-voltage electric motors and wires for use in high temperature environments. These advantages include a higher content of mica in the ribbon at the same thickness as conventional tapes, or thinner insulation with the same content of mica, high durability, tensile strength, lower tar and improved resistance to stress.

Non-twisted filaments are flatter than twisted yarn when woven into fabric, and the fabric is thinner than the fabric made from twisted thread. This means that for a given finite thickness of typical composite fiberglass/sheet mica can be added more mica sheet in the composite fabric. Because of sheet mica provides the desired characteristics for insulating the comp is Zita, it may be desirable to significantly increase the content of mica. For example, a typical composite fabric must have 2 mil fiberglass and 3 mils mica sheet. Using fabrics made of non-twisted yarn, the same composite fabric can be redesigned to 1.2 mils tissue and 3.8 Mila mica sheet. This increase in the content of mica by 27%. Another way to consider is to study the relationship mica-glass. In the first example, the ratio of the mica-glass is 1.5, compared with 3.2 in the example of a flat yarn. This increase primary component isolation may allow manufacturers of engines and generators to increase the load on the insulation and add more copper in the design. For a given size of machine, this may allow greater output power. In other cases, it may be desirable to reduce the thickness of the insulation. The thinner the insulating wall on the generator coils can improve thermal conductivity and to allow the unit to operate cooler, which can lead to improved operational durability. By replacing the standard fiberglass on fiberglass, made from non-twisted yarn can be obtained over a thin insulating material, without compromising mechanical or electrical properties, especially strength to strength.

Not the twisted fiber is not cut each other in a knitted weave and therefore, a thinner fabric typically has a higher resistance to stretching than the fabric of the same thickness and made of twisted yarns. In the form of a composite, this means that superior attitude mica-glass does not cause damage to strength, tensile strength, which should have a place to fiberglass from the traditional round thread. This is significant because the composite sheet mica-glass require high elasticity for end-use consumers.

Non-twisted fibers provide greater surface area for binding fabric sheet mica, the fabric, based on a twisted thread. The connection surface between the fiberglass and sheet mica is often a critical point for use by consumers. Therefore, you should try to maximize this surface binding. The natural geometry of non-twisted filaments in tissue leads to significantly improved communication with respect to the tissue based on twisted threads.

The total content of the resin used in the insulating material of the present invention, with respect to the sheet mica is typically less than traditional materials, because the fiberglass layer is small. This can lead to lowering the costs. In addition, the decrease in the volume of the body of the ical materials typically results in improved performance isolation resistance to stress and better thermal conductivity of the insulation.

For the insulating material of the present invention the layer of mica was eliminirovali on the layer of glass fiber by applying at least one polymeric resin, and usually two or more resins used to bind a layer of mica with fiberglass. The polymer resin may be a shrinkable resin, for example epoxy resin. In a preferred embodiment, a layer of mica and a layer of fiberglass was impregnable epoxy resins of different molecular weight, obtained from a solvent, and then combined together.

A layer of mica insulating material of the present invention typically is in the form of a mica sheet, but may also be applied to the mica flakes, shreds or pieces. Used Muscovite or phlogopite, usually available conveniences. Phlogopite has a higher thermal properties and thermal expansion coefficient. Sheet mica may be a sheet of soda mica or paper disintegrated integrated water (not calcined). A typical production method for soda mica sheet is as follows: first, the ore mica was caliciviral when, for example, 700-1000°C, to remove foreign substances and split in pieces will prefix is Ino a certain size. Then a jet of water was directed into pieces of mica, thereby obtaining fine particles of mica. The mixture is stirred in water, which led to the dispersion of mica. Then the dispersion used in the method of obtaining the paper on fabric, and dried to obtain a sheet of mica. The thickness of the layer of mica in insulating material of the present invention typically was in the range of from about 2 mils (50 microns) to about 10 mils (250 microns), preferably from about 2 mils to about 6 mils (150 microns) for use in the winding of the tape reels and polysterene, in which the composite acts as the main case insulation. For winding the strip individual conductors desirable thin film, and in such applications the thickness of the layer of mica is typically in the range of from about 0.5 mil (12 microns) to about 10 mils, preferably about 1 mil to about 4 mils (100 microns) and more preferably from about 1 mil to about 3 mils. The thickness of the fiberglass is typically in the range of from about 0.5 mil to about 10 mils, preferably from about 0.8 (20 μm) to about 5 mils (125 microns). Resins for use in the manufacture of electrical insulating material according to the present invention are selected according to the criteria of performance required for the final application, including thermal, mechanical and electrical SV is istwa resin. For example, IEEE 275 formulates a procedure for the study of the mechanical and electrical properties of laminates under thermal aging and mechanical pressure; in this area other known procedures. Any resin may be used so long as it is determined using sound engineering evaluation. A suitable resin system include heat-shrink epoxy resin, in particular epoxy phenol Novolac resins, butadiene resins, polyesters, silicones, bismaleimide and cyanate esters. Examples of acceptable epoxy resins include bis(3,4-epoxy-6-methyl-cyclohexylmethyl) adipate, vinylcyclohexane dioxide or glicinia ethers of polyphenol epoxy resins such as bisphenol diglycidyl-ether epoxy resin, phenolformaldehyde Novolac polyglycidylether epoxy resin, epoxiconazole novolak or mixtures thereof. The content of the resin may vary from about 3% to about 25% by weight, preferably from about 5% to about 18% by weight in strips for use in the method of VPI. For methods that require a tape having a higher content of resin, the resin content is typically in the range of from about 25% to about 50% by weight, preferably from about 27% to about 45% by weight.

In some embodiments, the implementation of e is izoljatsionnye material of the present invention further comprises a compound or composition, capable of accelerating the curing system of the epoxy-anhydrite resin. Such materials are used in the VPI ways in which mica tapes with accelerators in them impregnants VPI epoxy resin containing the acid anhydride. The accelerator is contained in the ribbon, in stoichiometric ratio with respect to the anhydride in VPI epoxy resin. Typical metal accelerators include naftalin zinc, octoate zinc, octout copper, octout chromium and octoate tin. Tertiary amines, such as Tris(dimethylaminomethyl)phenol, also effective, as well as the imidazoles, such as ethylmethylamino. Anhydrides in the resin may include: adduct of maleic anhydride and methylcyclopentadiene (anhydride metilidinovoe acid), Kadikoy anhydride, hexahydrophthalic anhydride, domiciliary anhydride, phthalic anhydride and parametricity anhydride.

Insulating material according to the present invention can be produced by any conventional methods known in this field. Such methods are described in U.S. Patent No. 4704322, No. 4286010 and No. 4374892, the contents of which is hereby incorporated into this description by reference in full. The main way to obtain mica tape according to the present invention consists in the application of the resin sheet mica and/or fiberglass and the connection together of the two layers.

Polymer clay is Naya film, for example a polyester or polyimide, can be included in the insulating material of the present invention, typically, on one or both of its outer surface. Polymer Mat can also be used instead of or in addition to the polymer film. Polymeric Mat is typically composed of non-woven fabric, in particular of polyester non-woven fabric having a thickness of about 0.8 to 3 mils. Film or Mat protects the layer of mica from damage during application. In addition, it may be useful to provide protection from damage by corona discharge insulation of individual conductors and, thus, the material is resistant to corona discharge, may be added to the insulation material for some applications. U.S. patent No. 5989702 and patents Canada No. 1168857 and No. 1208325 provide examples of addition of various compounds, such as particles of submicron size alumina or silica to the polymer composition used for coating individual conductors or to polymeric films. An example of applicable polymer film containing a material resistant to corona discharge, is KAPTON®CR from DuPont. The addition of particles of aluminum oxide or silicon dioxide may also improve the heat transfer characteristics of the insulation of the conductor.

Method of manufacturing insulated electric what about the conductor according to the present invention includes wrapping an electrical conductor thin insulating material, as described above, in particular mica tape, and heating the wrapped conductor for curing the resin. In particular, conductors, such as a coil for a rotary electric machine, can be wound conventional navipane lap and placed in the device forming coils. The way VPI can be used for impregnating the tape reels with a suitable insulating material, such as uncured polymer resin to fill all voids and cracks in the insulation, wrap overlap. The coil can then be heated to cure the composite coil and isolation on the polymerization method. An alternative method consists in winding the coil mica tape in the way of edge-to-edge, up until not applied the desired number of turns on the coil or core, and then applying heat and pressure to cause the solidification of the polymer material of the coil or core. During the operation of the heating and pressing the viscosity of the polymeric material "B"-stage first fell, and the excess resin is squeezed out of the coil pressure used to make the coil in its final form.

To isolate individual conductors with the use of the composite sheet mica-glass can be used, the advantage of a thin glass fiber to obtain a more desirable tone is Oh isolation. In addition, in the same allowable space more subtle isolation provides space for larger amounts of copper, without a decrease in the amount of mica in isolation, resulting in more power output. In addition, because of the high durability, tensile strength fiberglass strength, tensile strength composite insulation is the same, or even higher than conventional mica tape used as cable insulation. Tissue-based twisted strands, causing severe tabs in mica composites in the wrapped conductors. Non-twisted filament produces smoother and more subtle involved. In case of insulated round wire smooth surface is desirable during extrusion on the conductor. End-extruded layer on the wire can be more subtle and smooth. Resins for use in high-temperature isolation of the cable selected for operation in high-temperature conditions, typically represent a silicone resin, although it can be used any resin, which meets the criteria of performance for the application.

Cable, wire or conduit, suitable for operation at high temperatures, can be obtained by the wraps of a conductor, such as copper wire, mica tape according to the present invention. In some applications the wrapped package may be heated to cure the resin in the mica tape. Electrical insulating materials for high temperature wiring typically based on silicone resins. U.S. patent No. 4034153 and No. 6079077 describe methods for the production of insulated cable with conventional mica tape, the contents of which are incorporated into this description by reference. It should be noted that the layers of plastic film, and/or additional layers of mica tape, as described in U.S. patent No. 4034153 required in the method for receiving an insulated cable according to the present invention. High temperature electrical conductors typically meet the requirements of UL 5107, 5127 or 5128, or IEC 33l, or 332, and can operate at temperatures up to 450°C, preferably up to 600°C for domestic transactions and the current-carrying wire, and up to 750°C, preferably up to 1100°C, power cables, Central cables, signal and control cables, high temperature cables and fire resistant wiring and cables. Such conductors are widely used on ships and platforms located on the continental shelf, in tunnels, steel mills and nuclear power plants.

EXAMPLE 1.

4086 grams polybutadiene resin (Lithene AH, Lithium Corporation of America), having an approximate average molecular weight of 1800, was dissolved in 8172 grams of toluene containing approximately 41 grams mikumi the peroxide as a curing agent, that gave the solution of 33.4% by weight of the solid components.

Canvas ordinary mica thickness of approximately two mils brought into contact with the fiberglass canvas GlasFab® Direct from the Dielectric Solutions of a thickness of about 1.2 mils and covered with a roller with a solution of polybutadiene resin cloth mica top and inside through glass fiber canvas. Then roller on the fiberglass canvas was applied polymer insulating layer comprising a binder solution isoprene-butadiene A-B-blockcopolymer. The insulating layer in this particular example was obtained from a solution comprising of 6.7 pounds of toluene, 1,32 g of antioxidant (Irganox 101, Ciba Geigy), deliciosamente of 0.66 grams of antioxidant Weston 618 of 0.66 grams and 0.58 lb isoprene-butadiene A-B-blockcopolymer (Kraton 1107). Thus coated tape was heated on the bottom platen at a temperature of the roller about 375-450°C. After coating the tape (Tape #1) was subjected to heat treatment in a drying Cabinet at a temperature of about 325°F to essentially non-adhesive condition, but with a time limit in order not to initiate curing of the polybutadiene. After drying chamber layer polyethylenterephtalate film was applied with a thickness of about 0.25 mil on the other side of the mica tape, which is the opposite of fiberglass canvas, and the composite was passed through the rollers caland is a, heated to about 300°F.

A second sample (Tape #2) prepared in the same manner as the first sample, but including an additional layer of polyethylene terephthalate film layer blockcopolymer the first sample. This polyester layer was applied to the same place in the same way as the first polyester layer of the first sample. The relevant properties of the films are presented in table 1. Both tapes had a residual content of solvent (toluene) about 0.5% by weight.

Table 1
IndicatorsTape 1Tape 2
The binder content, %20-2520-25
Thickness (ASTM D374, Method)0,0050"0,0053"
Approximate surface density, lb/quadrum0,0280,031
Stability Gurley, Mg.@ 75°F500600
Dielectric strength, volts/mil8001200
The dielectric strip, kV winding with half overlap):
one layer3,14,5
two coats6,98,5
three with the OYA 8,910,5
The loss factor, °C, 1.4 percent (40 volts per mil, a two-layer laminate)155

Laminates based on other resin systems, obtained as described in table 2. The loss coefficient was determined for the selected laminates listed in this table.

Table 2
The resin systemLaminate flooringThe loss factor (155, 40 volts/mil, ASTM D150), %
Bisphenol a, anhydrite curing2 layer 0,006" mica sheet8,8
1 layer of polyamide14,7
2 layers of polyamide and sheet mica14,5
Novolak Epoxy* (3% BF3, 400 MEA)4 layers of 0.004" mica sheetthe 4.7
Novolak Epoxy* (3% BF3, 400 MEA, hot melt)-
Novolak Epoxy* (average molecular weight, 50 phr), phenol novolak4 layers of 0.004" mica sheet2,6
Novolak Epoxy* (low molecular weight, 50 phr), phenol novolak4 layers of 0.004" mica sheet8,8
Bisphenol a Epoxy* (low molecular the first weight, 50 phr), phenol novolak4 layers of 0.004" mica sheet11,0
Hydrocarbon elastomer (B-stage (solution in the solvent)4 layers of 0.004" mica sheet0,6
Hydrocarbon elastomer (B-stage (hot melt)-
Commercial hydrocarbon recipe **(without solvent)-
*) The data forming the casting were all drawn from the acetone solution of the resin.

**) Normalized class 180°C

EXAMPLE 2. The study by winding an insulating tape

Turn-to-turn isolation: rolls 3/4" x 100 yards had been the standard package. The test strip showed great styling without streaks marked for competing tape.

Case isolation: rolls 1" x 30 yards one inch I.D. cores (internal diameter cores) had been the standard package.

It was found that packing tape remains stable throughout the winding process, even at the highest tension. In addition, the tape was applied smoothly and with a very uniform appearance.

The coil was prepared with the use of the test material (coil #9) and two control tapes (reel #11 and coil #8). The side plate is spun bolts on the sections of the connectors coils to stimulate restrictions impregnating, happening when the coil is in the stator. All electrical testing was performed by removing the connectors of the side plates. This led to higher performance difference of dielectric loss at different voltages and values of the loss factor. However, since all coils are tested the same way, the results can be considered to be correlative.

Conclusions coils connected to a power source and loss factor were measured in the section of the connector by attaching the measuring pins to the side plates. Growths resin was removed in all areas of contact. The loss factor was measured at room temperature and then at an elevated temperature with a load of 2 kV. Every part of the coil tested and reported the average of the two results. The coils were allowed to come to thermal equilibrium by holding them at the measurement temperature for one hour before testing. The results consisted of the following:

typically most combinations of materials showed low loss factor at room temperature. Generally, increasing the temperature of the material increases the loss factor. This is a function of how well overiden resin in the tape due to the resin in the vessel VPI. In addition, it gives an indication of the total polar nature attributed the surrounding resin in the tape itself. It is optimal to have a zero increase and, in practice, to try to minimize this effect. As a rule, if there is an increase in the loss factor (DF), then you can also see the increase of the dielectric constant. Increased dielectric constant leads to a large dielectric voltage in the blank areas, which can become a place for inner corona discharge and, ultimately, insulation breakdown. The results, measured on reels # 11 and 9, were considered excellent and consistent with the epoxy system, utverzhdenii anhydride.

In addition, to measure the loss factor at room temperature was measured by the difference in dielectric loss at a voltage of from 2 to 8 kV at each site each coil. This measurement was performed both before and after the linear heating coils up to 180°C. the Intensity before the influence of temperature is intended to determine how well the insulation absorbed VPI resin. High index difference dielectric losses should reflect weak integrirovanie due to the high content of voids. The index difference dielectric loss after exposure to temperature will disclose problems with thermal stability as a result of obezvozhivanija and removal of the cavities of the insulating wall. The results sostoyalas following:

none of the coils was not found problems with outgassing or removing voids. They all showed improvement in the loss ratio after aging at 180°C. This is consistent with isolation, which gets an extra boost. The performance difference of dielectric losses are the norm, given the two-electrode configuration. Protected electrodes these values should be very smooth. The important point is that there is no increase in the actual index difference dielectric losses for testing material (Coil #9) and this is consistent with the control.

On the reels, tested on the loss factor, removing the plate section of the connector and cut a thin 0,050" cross section for visual observation of the alignment of copper, laying insulation and VPI filling resin. All of the cross-section of the coils showed some degree of distortion of the tape. Part of it was due to the alignment of copper, characteristics of laying the tape and the tape tension during application. All cross sections were also found pockets. These pockets were not void and were really well-filled epoxy resin. As the resin was semi-transparent and the samples were illuminated from behind, looked deceptively like an empty gaps. However, all coils were good what about filled VPI resins. This aspect should be considered great. Aligning copper coils 11 and 8 was much better than that of the coil 9. Presumably this aspect of cooking coil attracted much attention due to its selective nature.

EXAMPLE 3. Tar is the ratio of mica/fiberglass

The tape was obtained by the method described in example 1 using system epoxy resin. Researched tape differed from the control tape 2 only by the fact that applied the fiberglass from the Dielectric Solutions, composed of non-twisted fibers (table 3).

Table 3
Control sample 1Control sample 2The experimental sample
The thickness of the fiberglass (Mila)221,2
The thickness of the mica (Mila)365,6
Surface density fiberglass (g/cm2)27,527,528,8
The surface density of mica (g/cm2)120250252
The resin content (% by weight)4227-3330
The total thickness (Mila) 7109,35
Elasticity (pounds/inch)110110150
The ratio of mica/fiberglass thickness1,53the 4.7
The ratio of mica/fiberglass by weight4,49,18,7
The percentage compression3040
The thickness after compression in the layer with half overlap9,812
The ratio of mica/fiberglass thickness after compression1,452
60 vpm at 133 mil, no layer13,511
Tg (° (C) after curing for 10 hours, 150°C170170171
The percentage of loss factor, 160°C10,810,83,5

You can see that the test strip had a higher ratio of mica/glass thickness, less tar and higher force of elasticity than any of the control tape.

1. Insulating material that includes a layer of fiberglass in the form of woven fiberglass and a layer of mica, and Myung is our least one polymeric resin, in which layer of the optical fiber includes a non-twisted glass fiber thread.

2. Insulating material of claim 1, wherein the polymer resin comprises a heat shrinkable resin.

3. Insulating material of claim 1, wherein the polymer resin includes at least one epoxy resin.

4. Insulating material of claim 1, wherein the polymer resin includes at least one silicone resin.

5. Insulating material according to claim 1, in which the content of the resin is in the range from about 3% to about 25% by weight.

6. Insulating material according to claim 1, in which the content of the resin is in the range from about 5% to about 18% by mass.

7. Insulating material according to claim 1, further comprising a curing accelerator.

8. Insulating material according to claim 7, in which the curing accelerator include metal or amine.

9. Insulating material according to claim 1, in which the content of the resin is in the range from about 25% by weight to about 50% by weight.

10. Insulating material according to claim 3, in which the content of the resin is in the range from about 27% to about 45% by weight.

11. Insulating material according to claim 1 in the form of a tape.

12. Method for the production of insulated electric is Roudnice, includes wrapping an electrical conductor electrically insulating material according to any one of the preceding paragraphs.

13. The method according to item 12, further comprising heating the wrapped conductor for curing the resin.

14. The method according to item 12, in which an electrical conductor is a wire, suitable for use in high temperature environments.

15. The method according to item 12, in which an electrical conductor is a coil for use in high-voltage electric motor.

16. The method according to item 12, further comprising impregnating material shrinkable resin before heating the wrapped conductor.

17. High temperature insulated wire manufactured using the method according to 14, in which the said wire is designed to work at temperatures up to 450°C.

18. High temperature insulated wire manufactured using the method according to 14, in which the said wire is designed to work at temperatures up to 1100°C.

19. High temperature insulated coil, produced using the method according to item 15.



 

Same patents:

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SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).

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2 tbl, 13 ex

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EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.

1 cl, 2 tbl, 11 ex

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The invention relates to insulating materials and methods for their manufacture
Insulating material // 2084031
The invention relates to electrical engineering materials, namely, fire-resistant insulating materials intended primarily for the protection of cables, operating in high temperature conditions

FIELD: electrical engineering; insulating materials for wires or commutators of electrical machines.

SUBSTANCE: proposed mica base insulating material has mica paper layer, backing of inorganic fiber (glass or basalt), and binders, such as betulinic and adipic acids having molecular mass of 10 000 to 15 000. Such binders of desired molecular mass can be easily produced.

EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.

1 cl, 2 tbl, 11 ex

FIELD: insulation materials.

SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).

EFFECT: improved performance characteristics.

2 tbl, 13 ex

FIELD: physics; electricity.

SUBSTANCE: fibre glass layer contains out-of-wind fibre glass. It can be woven fibre glass fabric. The material is applied mainly for covering electric conductor, such as wire applicable for high-temperature environments and coils for high-voltage electric motors and generators.

EFFECT: possibility of production of thinner insulation material without deterioration of mechanical or electric properties.

19 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a heat-resistant wire or cable with improved operational properties designed for use in demanding or extreme conditions, for example in well drilling or field development, in industrial, military aerospace, naval fields, as well as in the motorcar, railway and public transport. Such cables can be subjected to extreme temperatures, corrosive substances or atmospheres or fire. The wire or cable comprises a conductor and a polymer sheath consisting of an internal and an external layer. One layer is tape made of polyetheretherketone (PEEK) and has thickness of 5-150 mcm. The second layer is fire-resistant and is made of a siloxane polymer or a polymer based on silicon dioxide as a polymer matrix. The PEEK tape can be combined with a mica layer or a layer which is polymer tape with mica particles.

EFFECT: invention increases fire-resistance of the sheath, its flexibility and resistance to mechanical stress, enables to obtain a wire or cable with a lower weight and diameter.

12 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: improved electrically insulating tape (16) is offered which comprises the protective layer (20) and the electrically insulating layer (18) joined with the protective layer (20). At least, one of either the electrically insulating layer (18) or the protective layer (20) includes a set of formed apertures (26) to improve penetration of impregnating pitch into the insulating tape (16) during pitch impregnation.

EFFECT: invention provides optimum impregnation of the tape that improves the ability to resist to impact of voltage and premature breakdown and accident.

10 cl, 11 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to heat-resistant polymer materials based on organosilicon binder for making electric insulating materials and developing design of winding wires. Composition includes organosilicon resins (A) and (B), poly(dimethyl siloxane) (C), poly(dimethyl methyl hydride siloxane) (D), and platinum catalyst (E). Design of winding wire contains conductor thread coated with two-layer, thermally treated insulation, first layer therein is made from mica-containing tape consisting of electrically insulating glass fabric and mica paper, impregnated and glued together with said composition, and second layer therein is made of polyimide fluoroplastic film.

EFFECT: technical result of invention is producing electric insulating materials with high flexibility and fire-resistance, and also higher corona-proofness and flexibility of wire insulation.

4 cl, 1 tbl, 7 ex

FIELD: cables.

SUBSTANCE: invention relates to high performance, high temperature resistant wires and cables as well as to a method for production thereof. Said wires and cables are fire-resistant and are used in heavy operating conditions, such as drilling or mining operations, industrial, military, aerospace and sea applications. Tape (20) comprises a laminated or co-extruded insulating first layer (24) of a polymer matrix in which mica particles are dispersed and second layer (26) of a polyether ether ketone (PEEK) or a blend or alloy thereof containing at least 50 wt% of PEEK. Surface of at least one said layer, opposite other said layer, is coated with fluoropolymer film (25). Sid tape can be used to form a multilayer coating on conductor (10) such as an electric wire. Outer protective layer (28) of a fluoropolymer such as PTFE may be applied around wrapped tape, by wrapping or extrusion.

EFFECT: technical result is production of wires and cables with good insulation, high temperature resistance, and also having improved mechanical properties at high temperatures.

59 cl, 4 dwg, 1 tbl

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