Stator coil fastener system for stators not coated by lacquer

FIELD: engines and pumps.

SUBSTANCE: invention relates to perfection of borehole generators, particularly, to support and limitation of displacement of stator coils arranged in the engine housing. Borehole motor has tubular housing elongated in lengthwise direction, stator part arranged therein, stator coil winding looped back in the stator by end turn with tip. It comprises connector to connect at least one of coil windings and housing end abutting on stator part end to support the winding.

EFFECT: fastening of stator coils not coated with lacquer inside motor housing.

17 cl, 5 dwg

 

The technical FIELD

[0001] the Present invention relates in General to improvements in downhole motors, and in particular to support and limit the movement of the coils of the stator are accommodated in the housing of the engine.

PRIOR art

[0002] electric Motors are often placed in wells for oil or gas fields to perform various functions. These functions may include artificial lift, where the engine drives the pump used to supply the downhole fluid to the surface. Normal engine may have a diameter of 6 inches (152 mm) and a length of 30 feet (9 m). The wire used in the windings, can be a magnet wire with a diameter of 1/8 inch (3 mm). Magnet wire of the electromagnet may have a length of more than 1000 feet (305 m). Magnet wire of the electromagnet is wound on the package of plates to create a coil of the stator for each phase of the motor. The coils of the stator in a three-phase AC motor can weigh more than 600 pounds (270 kg).

[0003] In some embodiments of downhole motors using stator coil wrapped polyimide tape and treated with varnish. Varnish coating provides mechanical rigidity, insulation, protects the coils of the stator from vibration damage, protects the winding from the water and holds on the coils of the stator in place. The varnish has an upper limit of operating temperatures approaching 400°F (204°C). Lacquer can be used in conjunction with epoxy resin, increasing the effective working temperature up to 550°F (288°C). At these and higher temperatures varnish should, in General, melt, causing the output of the motor.

[0004] Preferred is the possibility of operating equipment, artificial lift in the environment with higher temperature. In the system, gravity drainage using steam in the wellbore small diameter inject steam into the reservoir and in another wellbore enlarged diameter under the wellbore small diameter gather resulting from the produced fluids. Steam is used for lowering the viscosity of the downhole fluid and to produce a fluid reservoir, impossible under normal conditions. However, the temperature required for such operation may exceed 550°F (288°C). Therefore, varnished coils of the stator can become a limiting factor in the deployment of artificial lift in the well in such environment. Without varnish can cause problems related to inadequate support of the weight of the windings of the stator.

[0005] Accordingly there is a need for a device and a method of fixing is not covered with varnish ka the ears of the stator inside the motor.

A BRIEF STATEMENT of the substance of the INVENTION

[0006] embodiments of the present application relate to a device downhole motor, containing elongated in the longitudinal direction of the tubular body, a portion of the stator, located in the tubular casing, coil stator windings electrically connected to the stator end turn having a top, and a connecting device that connects at least one of the coil windings with end of the housing adjacent to the end portion of the stator supporting, thus, coil winding.

[0007] Other or alternative embodiments of having less features or additional features, will become apparent from the following description, drawings and claims.

BRIEF DESCRIPTION of DRAWINGS

[0008] the invention is further explained in the description of the preferred variants of the embodiment with reference to the accompanying drawings, in which:

[0009] Figure 1 depicts a side view of the downhole system having a submersible motor, located in the wellbore, according to a variant implementation;

[0010] Figure 2 depicts a part of the cross-section of a submersible motor in the downhole system 1 according to a variant implementation;

[0011] Figure 3 depicts a top view of a support device 2 according to several variants of implementation;

[0012] Figure 4 depicts a view of VN the internal scanner support device 2 according to several variants of implementation;

[0013] Figure 5 depicts a portion of a cross section of a submersible motor in the downhole system 1 according to a variant implementation.

[0014] it Should be noted, however, that the appended drawings illustrate only the usual options for implementation and should not be construed as limiting the scope of this application as options for implementation may allow other equally effective ways of implementation.

DESCRIPTION of the PREFERRED EMBODIMENT VARIANTS of the INVENTION

[0015] In the following description of the several parts described to facilitate understanding of various embodiments. However, the specialist in the art will understand that the data presented options for implementation can be implemented without these details and that numerous possible changes or modifications to the described embodiments.

[0016] In the description and the attached claims, the terms "connect", "connection", "connected", "in connection with" and "connecting" are used to mean "in direct connection with" or "in connection with another element"; and the term "set" is used to mean "one element or more than one element. In this document, the terms "top" and "bottom", "upper" and "lower", "upward" and "downward", "upstream" and "downstream"; "above" and "below"; and other like terms indicating relative activities the major provisions above or below a given point or element are used to more clearly describe some embodiments. However, when applied to equipment and methods for directional or horizontal wells, such terms can mean the left or right position or other mutual arrangement. In addition, the term "sealing mechanism includes: packers, bridge plugs, downhole valves, sliding sleeves, combinations of couplings and tubes, seals and polished foster nests, and other methods and devices for temporarily blocking flow of fluid through the wellbore. In addition, the term "fluid handling" includes the fluid supplied into the formation treatment fluids zones for stimulation of production, including, but without limitation, the fluid fracturing, acid, gel, foam or other fluids treatment fluids zones for stimulation.

[0017] the Present invention relates in General to downhole system that uses a submersible motor. As an example, submersible motor can be used in the system of electric submersible centrifugal pump for mining or other motion required fluid. An implementation option may include a submersible motor, designed with not varnished coils of the stator and with the control device used to maintain the coil windings is the commutator in the motor housing.

[0018] In the embodiment shown in figure 1, the system 34 electric submersible pump has a design for deployment in the well 40 in the geological reservoir 42 containing the necessary fluids extraction, such as the fluid medium on the basis of hydrocarbons. The barrel 44 wells are usually drilled into the reservoir 42 and, in at least some embodiments, application, aligned casing 46. Casing 46 perforated wellbore from the formation of multiple holes (perforations) 48 through which produced fluids can flow from the reservoir 42 into the barrel 44 of the well. In other embodiments, the application system 34 submersible pumps can be used to supply fluid processing in the hole and the perforation channels 48 in the surrounding reservoir.

[0019] the System 34 electric submersible pump can be deployed in the barrel 44 of the borehole by means of a suitable system 50 of transportation, which may have a different design and configuration depending on the application. For example, the system 50 transportation may contain tubing 52, such as a production tubing or twisted tubing. The system 50 transportation connected with submersible pump 36 or another suitable component of system 34 electric submersible cents is obingo pump coupling device 54. In the shown embodiment, the power cable 56 is laid in the well along with the system 50 and conveying system 34 electric submersible pump submersible motor 32. Power cable 56 supplies the electric power to the submersible motor 32, drive the submersible pump 36. When operating the submersible pump 36 takes the fluid bore in the system 34 electric submersible pump through the suction hole 58 of the pump and pumps the fluid to the collection point, for example, the tubing 52.

[0020] as an example, submersible motor 32 may include three-phase induction motor in which the coil 76 of the stator create a field of the motor. Submersible motor may be of a design without varnish, and the coil 76 of the stator have end turns 77a and 77b, supported by the supporting device, as described in more detail below.

[0021] figure 2 shows one implementation of a submersible motor 32. In this embodiment, the submersible motor 32 includes an external housing 60, such as dubcity case. The stator 62 having a channel 64 of the stator installed in the housing 60 so that the channel 64 of the stator, in General, aligned with the housing 60 in the axial direction. The rotor 66 is installed in the channel 64 of the stator for rotation therein and is connected to the drive shaft 68. During operation, rotate the different rotor 66 causes rotation of the drive shaft 68, and this rotation is used to actuate the submersible pump 36.

[0022] as an example, the stator 62 is made of many plates 70, such as a steel plate with insulation between each of the plates. Package steel plates can be insulated with suitable end plates 72a and 72b arranged on the opposite axial ends of the plate pack 70. Many options for use of the perforated plate so as to create, in General, axial slots for receiving insulated wires 74 electromagnet, which form the coil 76 of the motor stator. The axial ends of the plate pack, insulated wire coils 74 and 76 of the stator looped end coils 77a and 77b. End coils 77a and 77b provide direction insulated wires 74 for the backward pass through a set of plates for axial cracks according to the desired pattern of the winding. Insulated wires 74, forming the end turns 77a and 77b, can be grouped together, with each group to secure a suitable winding 80 or other type of coating. Electric power is applied to winding 76 suitable lead wires 82. Submersible motor 32 is a three-phase motor, containing the coil 77 of the stator for all three phases, the corresponding end coils 77a and 77b for each of the coils 77 stator.

[0023] as an example, Ariant embodiment of the invention may include the use of support devices 84a and 84b. The supporting device 84a and 84b may have a flat shape and having slits 102, as shown in figa creating the connection point. After each of the three windings 76 of the stator that are required for the engine 32 AC, seasoned, wrapped tape 80, and coated with epoxy resin support device 84a, 84b inserted into place at both ends of the housing 60. Then, each of the end turns 77a and 77b connected to the adjacent supporting device 84a and 84b and a connecting device 86a and 86b for the connection of the windings 76 of the stator support device 84a and 84b. For example, the connecting device may be a fiberglass tape. In addition, the connecting device 86a and 86b can help to prevent axial and radial movement of the coil 76 of the stator.

[0024] as an example of a support device 84a and 84b can be performed with different types of configurations of the slits, as shown in figure 3. On figa shows the supporting device 101, accommodated in the housing. Slit 102 may have a pattern that is optimized to support the weight of the coil 76 of the stator, and also made by other design considerations. Slit 103 to the reference device 104 is smaller and must be able to support more weight coil 76 of the stator. The supporting device 105 is easier to manufacture, since the slit 106 can be performed by a simple drilling.

[025] In another embodiment of the invention used the support device 188 with undulating profile, minimizing the movement of the coil 76 of the stator. For comparison, figa shows the internal scan of the previous embodiments, and figv shows the internal scan this option implementation. After filling, the ribbon winding and coating with epoxy resin to each of the three coils 177 of the motor stator, the support device 188 with wavy profile is placed on the installation location. Then, each of the three end-turns are combined, for example associated with the control device 188 with a wavy profile with connecting device 186, for example, a sufficient number of fiberglass tape 186, for suspension coils 177 stator support device 188. Then the support device 188 with wavy profile on the opposite side of the housing 60 is placed on the installation location, and again end coils 190 on the opposite side connected to the connecting device 186 and get the opportunity to prevent axial and radial movement of the coil 177 of the stator. Wave profile support device 188 is made so that the limiting mechanism, in this embodiment fiberglass tape 86 has a tension force normal to the contact point of the end coil 190 with fiberglass tape 86. This should prevent sliding fiberglass tape 186 towards the top end of the VI is 190 ka. In the power on fiberglass tape 86 should be evenly distributed and the tape should be less prone to breaking.

[0026] Another variant of implementation may include the use of conical design in conjunction with fiberglass tape 214a and 214b to prevent axial and radial movement of the coil 276 of the stator. Conical structures 92a and 92b inserted, as shown in figure 5, and they must hold coil 276 of the stator in place on the motor housing 260. Then end coils 210a and 210b fasten with a support device 212a and 212b fiberglass tape 214a and 214b, respectively. Conical structures 92a and 92b reduce stress on the fiberglass tape 214a and 214b, respectively. Conical structures 92a and 92b also provide use as a connecting device mechanically less durable materials with improved characteristics, such as temperature.

[0027] Alternatively, the supporting device 84a and 84b can be made from a suitable metal other than stainless steel, such as a suitable polymer, plastic, metal with an insulating coating and/or composite structure. The supporting device 84a and 84b may be as conductive and non-conductive metal, depending on the distance from the end turns and other considerations of construction the th execution, such as the insulation on the end turns and the type of material of the retention mechanism.

[0028] Alternatively, the connecting device 86a and 86b can be made of nylon, Teflon or other suitable materials or equivalent materials or combinations known in the art.

[0029] Alternatively, the supporting device 84a and 84b can be installed on a flange in the housing 60 instead of screwing into place. The supporting device 84a and 84b can also be screwed into place until it stops in the flange.

[0030] alternatively, the supporting devices 84a and 84b, you can use some other types of contact points instead of cracks or holes, known in the art.

[0031] embodiments of described above provide examples of submersible motors and supporting devices that can be used to increase the service life of various downhole systems. It should be noted, however, that the clamping mechanism can be used to prevent radial inward rupture of the end windings in many types of engines and in a wide range of options for downhole applications. Additionally, the material used to create the retention mechanism, the number of components of the clamping mechanism used in individual engine, and configuration of these components can be adjusted if necessary to Dan the wow version of the application. Although numerous coil 76 of the stator are the most common, is assumed to be one or more of the end windings. Also, although the coil 76 of the stator and the corresponding parts described and often are assumed at both ends of the motor/ stator, it is assumed that the individual elements are applicable only to one end.

[0032] Accordingly, although the above described only a few embodiments of the present invention, a specialist in the art it should be clear that many possible modification without material departure from the essence of this application. Such modifications are aimed at the inclusion in the scope defined by the claims.

1. The device of the downhole motor, comprising:
elongated in the longitudinal direction of the tubular body;
part of the stator, located in the tubular body;
roll the stator windings are electrically connected in the portion of the stator end turn having a top;
the supporting device adjacent to the end of the housing and by the end of the stator, while the profile of the support device is essentially flat and in the form of a disc; and
a connecting device connected between at least one of the coil windings and the reference device, whereby supporting the coil winding.

2. The device according to claim 1, in which the winding with atora contains the magnet wire of the electromagnet, at least partially wrapped by a material selected from:
fiberglass tape,
Teflon tape;
material nylon base; and
material on the basis of peek.

3. The device according to claim 2, in which the stator coil is covered with epoxy resin.

4. The device according to claim 1, in which the motor has three phases and comprises a pair of end coils for each of the three phases.

5. The device according to claim 1, in which the reference device is ring shaped and includes holes for connection with the connecting device.

6. The device according to claim 2, in which the supporting device comprises at least one material selected from:
insulating material;
steel powder coated;
steel alloy;
ceramic material;
plastic material; and
carbon-fiber composite.

7. The device according to claim 1, wherein the supporting device has a sinusoidal profile.

8. The device according to claim 1, wherein the connecting device comprises a material selected from the group consisting of at least:
tape containing fiberglass;
threads containing material on a polymer basis; and
tape containing Teflon.

9. System for use in the extraction of fluid from the wellbore, comprising:
electric submersible motor;
a pump connected to the electric submersible is the first engine;
engine protection, hydraulically connected to an electric submersible motor, providing compensation for pressure and volume for a fluid motor in an electric submersible motor;
this submersible motor has a stator coil with many end-coils connected to the supporting device coupling element, and the supporting device has a sinusoidal profile.

10. The system according to claim 9, in which the stator coil includes winding the wire of the electromagnet, at least partially wrapped by a material selected from:
fiberglass tape,
Teflon tape;
material made of nylon; and
material on the basis of peek.

11. The system of claim 10, in which the stator winding is covered with epoxy resin.

12. The system of claim 10, in which the motor has three phases and comprises a pair of end coils for each phase.

13. The system of claim 10, in which the supporting device comprises holes for connection with the connecting device.

14. The system of claim 10, in which the supporting device comprises a material selected from the group consisting of at least:
insulating material;
steel powder coated;
steel alloy;
ceramic material;
plastic material; and
carbon-fiber composite.

15. System 14, in which pornoe device has, essentially, a flat profile and the form of a disk.

16. The system of claim 10, in which the connecting device comprises a material selected from the group consisting of at least:
tape containing fiberglass;
threads containing material on a polymer basis; and
tape containing Teflon.

17. The system according to claim 9, in which the reference device is an integrated part of the electric submersible motor.



 

Same patents:

FIELD: engines and pumps.

SUBSTANCE: set of inventions relates to borehole pumps and to seal assembly used with pump drive motors. Seal assembly arranged between motor and pump of the borehole electrically driven pump unit comprises housing with chamber, its bottom being communicated with said motor and its top with said pump. Said assembly comprises inlet connected with said chamber and housing outer chamber, communication opening connected with motor fluid chamber, top and bottom channels for motor shaft ends to be fitted therein. It has communication pipe its bottom end being connected with said communication opening and its top end extending into the housing. Bellows is arranged inside the housing to receive the communication pie top end for fluid passage. This assembly has top and bottom seal elements arranged inside top and bottom axial channels to seal boundaries between top and bottom channels and drive shaft.

EFFECT: longer life, ruled out ingress of harmful matters in engine.

7 cl, 2 dwg

FIELD: oil and gas industry.

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2 dwg

FIELD: electricity.

SUBSTANCE: invention relates to electrical engineering and may be used in submersible electric motor with enclosed-type stator. Electrical machine has stator frame (4) and winding package (11) surrounding rotor (2) of the electrical machine (1), which is located in stator frame (4) and has axial-directed operating zone (16), which is designed for electrodynamic interaction of winding package (11) with rotor (2); at that stator frame (4) at the side faced to rotor (2) has a circumferential open gap, which in its axial lengths complies with axial length of the winding package (11) operating area (16) and where electrically non-conductive separator pipe (19) of the electric machine (1) is installed and this pipe is sealed in regard to stator frame (4) so that winding package (11) is separated hermetically from rotor (2), at that separator pipe (19) passes in axial direction only in the operating area (16) of winding package (11).

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12 cl, 2 dwg

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1 dwg

FIELD: electricity.

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1 dwg

Electrical machine // 2476974

FIELD: electricity.

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4 cl, 2 dwg

FIELD: electricity.

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2 cl, 1 dwg

Downhole generator // 2453698

FIELD: machine building.

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EFFECT: simplified design, higher reliability and power output, smaller sizes.

5 cl, 2 dwg

FIELD: electrical engineering.

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EFFECT: potential use in space engineering where it will improve the manufacturability of such devices.

1 dwg

FIELD: electricity.

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1 dwg

FIELD: electro-mechanical engineering.

SUBSTANCE: bandage of electric machine anchor winding is made in form of continuous solid coiling, coil to coil, in a layer of isolated wire of magnetic or non-magnetic material at whole axial length of bandage section of winding, which does not have other means of radial attachment. The bandage contains even number of wire layers with a lock of beginning and end of coiling on one of end sides. Below each single or double layer of wire, an insert ribbon is positioned which envelopes the anchor surface being bandaged in one layer and which is made of non electro-conductive reinforced material containing axially oriented direct threads rigid to stretching. Aforementioned insert ribbon is provided with collar stops on external surfaces along end edges. Collar stops are longitudinally reinforced with wire or non-metallic filaments rigid to stretching. Axial distance between their internal stopping surfaces is equal to axial size of surface being bandaged.

EFFECT: simplified construction, ensured maximal technically possible reduction of losses to vortex currents, ensured stable reliability.

4 cl, 8 dwg

FIELD: electric engineering and electro-mechanical industry, in particular, features of design of coils with salient poles for rectangular stators of salient-pole electric machine.

SUBSTANCE: in the coil for magnetic system of stator of salient-pole electric machine with rectangular poles, made by winding of flat rectangular cross-section bus onto narrow rib and containing elements of body and coil isolation with monolithic realization of working part of coil, in accordance to invention, on frontal parts of coil air gaps are provided between coils, expanding in wedge-like fashion in axial direction from the end of magnetic-duct of pole, in gaps between coils in longitudinal symmetry plane of coil distant inserts are installed made of solid isolating material with shape and dimensions, corresponding to gaps between coils in this plane, and with width substantially lesser than width of pole, connected by gluing to surfaces of adjacent coils, a packet of structural elements, consisting of frontal parts of coil rings and distant inserts between them, is fastened in longitudinal symmetry plane of the coil by bandage of non electro-conductive material, resistant to stretching, aforementioned inserts being of orthogonally symmetric H-like form with height of bar, equal to width of bus, and with common height, exceeding it by double bandage thickness, aforementioned bandage being positioned between shelves formed by aforementioned method. Due to such characteristic feature, all four sides of rectangular cross-section of each conductor within limits of frontal part of coil form surfaces, directly cooled by blowing air or liquid, correspondingly to scheme of theoretically full usage of external surface of conductors for their cooling.

EFFECT: increased efficiency of electric machine, increased density of current in windings, resulting in improved mass-dimensional characteristics of electric machine, decreased temperature of windings, and, thus, increased lifetime of isolation, allowing to use isolation of lesser heat resistance which is therefore cheaper or more technologically accessible.

8 cl, 10 dwg

FIELD: electrical and electromechanical engineering; rotors of large electrical machines such as turboalternators.

SUBSTANCE: proposed electrical machine rotor has heavy wound core whose winding coils are secured in end portions in radial direction by means of heavy metal banding rings fitted with one end on butt-end portions of core and with other end, on cylindrical surfaces of Z-section alignment rings; inner surface of alignment rings are joined with end portions of rotor shaft, two rows of slits being made in vicinity of mentioned rotor-shaft or banding-rind junction surfaces of each alignment ring uniformly and tangentially disposed over circumference of the latter in relatively staggered manner. One row of mentioned slits can be made in mentioned zones within alignment ring and other row, on rotor shaft surface jointed to alignment ring, for instance in the form of cooling ducts.

EFFECT: enhanced reliability due to additional reduction of alternate stress in zone where banding rings are fitted on rotor core.

1 cl, 2 dwg

The invention relates to the field of electrical and electric engineering, in particular to the construction of large electric machines, mainly turbogenerators and hydrogenerators, and more particularly to the fastening elements of the winding in the slots of the core

The invention relates to electrical machines, namely, devices for closure (closure) of the slots, and the system circuit filled with conductive rods or reels of the slots of the stator body of sheet steel electrical machines with end locks grooves, which consist respectively of the upper prismatic body, on the lower side of which has a surface that passes obliquely, and a lower prismatic body facing to the upper body, the surface of which is inclined relative to the bottom surface of the upper prismatic body in the opposite direction, and direct the jamming may be accomplished by relative displacement of both prismatic bodies

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The invention relates to electrical engineering and can be used in transformers and electrical machines

The invention relates to the field of electrical engineering, namely electrical DC machines and can be used in the design of traction motors, ship crests electric motors, excavators and t

FIELD: electricity.

SUBSTANCE: first they impregnate glass mica tape by the first compound. Simultaneously the second compound is made on the basis of the first one, where a magnesium accelerator of polymerisation is added additionally. Then one or several layers of the glass mica tape are applied onto the item, heated in a furnace to 150-160°C. Then the item is placed into an autoclave with the second compound for 3-10 minutes. Afterwards this item is removed from the autoclave and is placed into the furnace, maintained for 2-3 hours at 160-180°C. The first compound includes the following components at their following ratio, in wt %: 89.6-54.3 of methacrylated epoxide resin, 10-45 of dimethacryl ether of triethylene glycol, 0.2-0.3 of peroxide initiator of polymerisation, 0.2-0.4 of polymerisation inhibitor. The second compound includes the following components at their following ratio, in wt %: 87.6-52.0 of methacrylated epoxide resin, 10-44.9 of dimethacryl ether of triethylene glycol, 1.0-1.2 of peroxide initiator of polymerisation, 1.2-1.4 of manganese accelerator of polymerisation, 0.2-0.5 of polymerisation inhibitor.

EFFECT: invention makes it possible to increase quality of insulation, accuracy of production of specified characteristics by means of provision of deep and even impregnation of insulation with a binder, and to reduce power and labour inputs.

5 cl

FIELD: electrical engineering.

SUBSTANCE: coils are wound on the frame by copper wire coated with polyethylene lacquer. Coils surface is insulated by a layer of insulating tapes. Isoflex spacers are arranged between layers of turns. Note that coil surface insulation is made by one layer of tape "ЛЭС" and tape "ГИП-ТС-Пл", and six layers of glass-mica tape "ЛСЭП-934-ТПл". Then, coils are impregnated with thermosetting lacquer in vacuum-pressurisation procedure. Coils fitted in stator, the coils are additionally coated by isolation enamel "ГФ92ХС" or insulating lacquer "БТ-99".

EFFECT: higher reliability, longer life.

1 dwg

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

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