CN218783645U - Novel insulation structure - Google Patents
Novel insulation structure Download PDFInfo
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- CN218783645U CN218783645U CN202223190208.3U CN202223190208U CN218783645U CN 218783645 U CN218783645 U CN 218783645U CN 202223190208 U CN202223190208 U CN 202223190208U CN 218783645 U CN218783645 U CN 218783645U
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- stop band
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- stator
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Abstract
The utility model discloses a temperature resistant index reaches novel insulation system of H level, including stator core, stator coil, the few glue mica tape of glass cloth reinforcement, prevent dizzy structure, stator coil adopts the few glue mica tape of glass cloth reinforcement to wrap up the back, respectively in the straight line, the tip prevents dizzy processing, then it spouts the inslot of low drag paint to go down to the inslot, adopt cushion adjustment coil end clearance through the adjustment, the tip adopts the end hoop to fix, then vacuum pressure soaks dries by fire epoxy anhydride resin, it is complete to form, inclosed insulation system, this novel insulation system, adopt to prevent dizzy structure and solve the surface discharge problem, insulation system is provided for H level 10.5kV motor, high-voltage motor design and manufacturing provide solution in this field.
Description
Technical Field
The utility model belongs to the technical field of the motor design, in particular to novel insulation system.
Background
With the progress of high-temperature-resistant insulating materials, motors with the temperature resistance index of H level are applied to the market, but for safety-added type flameless high-voltage explosion-proof motors, the requirements for the insulation structure and the manufacture of the motor are changed due to the special required working environment, according to GB3836.3-2021 part 3 of explosive environment: equipment protected by increased safety type "e" and GB3836.8-2021 part 8 of explosive environment: the motor insulation structure, insulation system and connecting cable required by the standard of ' n ' -type protected equipment ' meet the requirement that in an explosive gas mixture of hydrogen and air (21.0%) (v/v), 1.5Un 50Hz test voltage is respectively applied between opposite grounds for 3min, and explosion does not occur. In the prior art, an H-level motor cannot pass an explosion-proof impact test due to structural reasons.
The motor winding is under the action of unbalanced electric field in high-voltage electric field, and partial discharge occurs on the surface of the coil, and in the explosive gas environment, the partial discharge can cause gas explosion, thus causing safety accidents. Two conditions need to be met for solving the problem of the 10.5kV H-class motor: one is that the temperature-resistant index of the insulating material needs to reach H level, and the other is that the insulating material can not explode at the time of 15.75kV and 3min under the environment meeting the standard requirement. Partial discharges are the root cause of explosions, while the root cause affecting partial discharges is the insulating structure and the distance of the discharge to the phase, relative to ground.
Because the winding can not generate electric arc, spark, high temperature and other defects when the safety-enhanced sparkless motor works, the safety is very high, and the motor is often applied to flammable and explosive special environments. The F-level safety-increasing sparkless motor is already applied, but the H-level safety-increasing sparkless motor is still vacant domestically, the technical purpose is to overcome the defects of the prior art, and a novel insulation structure with the temperature resistance index reaching the H level is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at above-mentioned prior art not enough, provide a novel insulation system, through rationally laying insulation system and coil end clearance and to the ground clearance, and adopt and prevent dizzy structure and make the local potential of coil carry out voltage release, satisfy high-voltage motor design and manufacturing.
For solving the above technical problem, the utility model discloses a technical scheme be:
a novel insulation structure is provided, wherein a stator structure with a winding comprises a stator core, an anti-corona structure, a stator coil, an end hoop and an end fixing cushion block;
the stator core is provided with a core slot, the stator coil is arranged in the core slot and fixed by a cushion block and a slot wedge, and the end part of the stator coil is provided with an end hoop and fixed by a binding rope;
the anti-corona structure comprises an anti-corona in the iron core slot and a coil anti-corona, the coil anti-corona comprises a low stop band of a half-lap pack, a middle stop band of the half-lap pack and a high stop band of the half-lap pack, the middle stop band of the half-lap pack and the high stop band of the half-lap pack are overlapped on the low stop band, and the low stop band, the middle stop band and the high stop band are distributed along the linear part of the stator coil to the end part.
The low-resistance band is prepared by taking an alkali-free glass wire as a base material and dip-coating semiconductor paint, and has the surface resistivity of 500-5000 omega and the length of + (2 x (40-80 mm)) of the iron core.
The middle stop band is made of alkali-free glass fiber interwoven tapes and is impregnated with semiconductor paint, and the surface resistivity of the middle stop band is 5 multiplied by 10 7 -1×10 10 The length of the middle stop band is 100 mm-150 mm, and the lap length of the middle stop band and the low resistance band is 15-40 mm.
The high-resistance belt is made of alkali-free glass fiber interwoven belts and is impregnated with semiconductor paint, and the surface resistivity of the high-resistance belt is 1 multiplied by 10 9 -9×10 12 The length of the high stop band is 100 mm-200 mm, and the lapping length of the high stop band and the middle stop band is 15-40 mm.
The outer sides of the corresponding areas of the middle stop band and the high stop band are also semi-overlapped with mica tapes, and the outer surfaces of the corresponding areas of the middle stop band, the high stop band and the coil end are also semi-overlapped with protective tapes.
The utility model has the advantages that:
(1) The utility model discloses a temperature resistant index reaches novel insulation system of H level, including stator core, stator coil, the few glue mica tape of glass cloth reinforcement, prevent dizzy structure, stator coil adopts the few glue mica tape of glass cloth reinforcement to wrap up the back, respectively at the straight line, the tip prevents dizzy processing, then go down to the inslot that spouts the low resistance lacquer, adopt cushion adjustment coil tip clearance through the adjustment, the tip adopts the end hoop to fix, then vacuum pressure soaks dries by fire epoxy anhydride resin, form complete, inclosed insulation system, this novel insulation system, adopt and prevent dizzy structure solution surface discharge problem, increase the no spark type motor of ampere type and provide an insulation system for H level 10.5kV and following, high-voltage motor designs and makes and provides the solution for this field.
(2) This structure can reliably pass through GB3836.3-2021 "explosive environment part 3: equipment protected by "e" of increasing safety type and GB3836.8-2021 part 8 of explosive environment: the insulation structure of an H (F) level motor with the voltage of 10.5kV or below in the standard requirement of an n-type protected device fills the domestic vacancy.
Drawings
FIG. 1 is a schematic view of a stator with windings according to the present invention;
FIG. 2 is a schematic diagram of the position of the end spacers and the end gap of the stator with windings of the present invention;
fig. 3 is a schematic diagram of the anticorona treatment of the stator coil with winding according to the present invention.
Detailed Description
The following description is given for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present invention.
The utility model provides a novel insulation structure, as shown in figure 1 to figure 3.
A novel insulation structure is provided, wherein a stator structure with a winding comprises a stator core 1, an anti-corona structure 2, a stator coil 3, an end hoop 4 and an end fixing cushion block; the stator core 1 is provided with a core slot, the stator coil 3 is arranged in the core slot and fixed by adopting a cushion block 7 and a slot wedge, and the end part of the stator coil 3 is provided with an end hoop and fixed by adopting a binding rope; the anti-corona structure 2 comprises a coil anti-corona, the coil anti-corona comprises a half-lap-wrapped low-stop band, a half-lap-wrapped middle-stop band and a half-lap-wrapped high-stop band, the half-lap-wrapped middle-stop band is overlapped on the low-stop band, and the low-stop band, the middle-stop band and the high-stop band are distributed to the end part along a straight line part of the stator coil.
As shown in FIG. 3, the coil linear part is half-lapped with 1 layer of special low-stop band 33, the low-stop band 33 is made by taking an alkali-free glass wire as a base material and dip-coating semiconductor paint, and the surface resistivity of the low-stop band is 500-5000 omega. The length is the length of an iron core plus (2 x (40 mm-80 mm)) and then the half-lap wraps 1 middle stop band 34, wherein the middle stop band 34 is made of alkali-free glass fiber interwoven tape impregnated with semiconductor paint, and the surface resistivity of the middle stop band 34 is 5 x 10 7 -1×10 10 The length of the middle stop band 34 is 100 mm-150 mm, the lapping length of the middle stop band 34 and the low stop band 33 is 15-40 mm, then a layer of special high stop band 35 with non-linear coefficient is semi-overlapped, the high stop band 35 is made by impregnating alkali-free glass fiber interwoven band with semiconductor paint, the surface resistivity of the high stop band 35 is 1 multiplied by 10 9 -9×10 12 High impedance length 100mm &200mm, overlapping 15-40 mm with the middle stop band 34, then half-lapping 1 layer of the mica tapes 5 with less glue in the areas of the middle stop band 34 and the high resistance band 35, and half-lapping 1 layer of the protective tapes 6 on the outer surfaces of the middle stop region, the high resistance region and the end part of the coil.
31 layers of electromagnetic wires of the stator coil are wrapped by polyimide film tapes in a half-overlapping mode for 1 layer, then polyimide reinforced mica tapes are wrapped by one layer, and the outermost layer is formed by winding double glass fibers.
The stator coil insulation structure comprises the following contents:
the coil straight part adopts multilayer glass cloth reinforced little-glue mica tape 5452-1T for half-lap wrapping, the thickness of the unilateral main insulation 32 reaches 2.3 mm-2.8 mm, and the coil end insulation can be wrapped by 1 layer less.
The coil lead insulation adopts half-lap-coated glass cloth reinforced little-glue mica, and before insulation, a lead head needs to be bent and molded according to requirements, two ends of the lead head are wrapped into cones, and the wrapping length of the lead head needs to extend to 1/3-1/2 of the length L of the bevel edge of the end part; and the outermost layer is half-overlapped with a protective belt.
Stator coil goes down to stator core inslot, and the inslot adopts filler strip and slot wedge to fix the coil, and the tip is equipped with end hoop, ligature rope, and the mouth end anticorona district does not set up the cushion, and the coil tip is equipped with tip hypotenuse cushion, and adopts 7 adjustment tip clearances of cushion between the coil after the coil rolls off the production line, reaches experimental requirement.
The gap of the winding end is covered with an epoxy glass laminated board by adopting a polyester felt and is filled in the gap of the bevel edge of the coil end, wherein 3-6 cushion blocks are arranged between the polar groups, and 2-5 cushion blocks are arranged in the polar groups, as shown in figure 2; and (3) completely soaking the stator with the winding in the epoxy anhydride resin and drying.
The utility model discloses in order to satisfy GB3836.3-2021 "explosive environment part 3: equipment protected by increased safety type "e" and GB3836.8-2021 part 8 of explosive environment: the system and the connecting cable specified in the standard of ' n ' -type protected equipment ' meet the requirement that in an explosive gas mixture of hydrogen and air (21.0%) (v/v), 1.5Un 50Hz test voltage is respectively applied between each two opposite grounds for 3min, so that explosion does not occur, the insulation thickness and size are reasonably selected, an anti-corona structure is adopted to solve the problem of surface discharge, an insulation structure is provided for an H-level 10.5kV motor, and a solution is provided for the design and the manufacture of a high-voltage motor in the field.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the embodiments and descriptions herein to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, all of which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents.
In the description of the present invention, it should be understood that the terms "front", "back", "left", "right", "center", and the like refer to the orientation or positional relationship shown in the drawings, and are used only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the scope of the present invention.
Claims (5)
1. A novel insulation system, its characterized in that: the stator structure with the winding comprises a stator core, an anti-corona structure, a stator coil, an end hoop and an end fixing cushion block,
the stator core is provided with an iron core groove, the stator coil is arranged in the iron core groove and fixed by adopting a cushion block and a groove wedge, and the end part of the stator coil is provided with an end hoop and fixed by adopting a binding rope;
the anti-corona structure comprises a coil anti-corona, the coil anti-corona comprises a low stop band of a half-lap pack, a middle stop band of the half-lap pack lapped on the low stop band and a high stop band of the half-lap pack lapped on the middle stop band, and the low stop band, the middle stop band and the high stop band are distributed to the end along the linear part of the stator coil.
2. A novel insulation structure according to claim 1, characterized in that: the low-resistance band is prepared by taking an alkali-free glass wire as a base material and dip-coating semiconductor paint, and has the surface resistivity of 500-5000 omega and the length of + (2 x (40-80 mm)) of the iron core.
3. A novel insulation structure according to claim 1, characterized in that: the middle stop band is made of alkali-free glass fiber interwoven tape and is impregnated with semiconductor paint, and the surface resistivity of the middle stop band is 5 multiplied by 10 7 -1×10 10 The length of the middle stop band is 100 mm-150 mm, and the lap length of the middle stop band and the low resistance band is 15-40 mm.
4. A novel insulation structure according to claim 1, characterized in that: the high-resistance belt is made of alkali-free glass fiber interwoven belts and is impregnated with semiconductor paint, and the surface resistivity of the high-resistance belt is 1 multiplied by 10 9 -9×10 12 The length of the high stop band is 100 mm-200 mm, and the lap length of the high stop band and the middle stop band is 15-40 mm.
5. A novel insulation structure according to any one of claims 1 to 4, characterized in that: the outer sides of the corresponding areas of the middle stop band and the high stop band are also semi-overlapped with mica tapes, and the outer surfaces of the corresponding areas of the middle stop band, the high stop band and the coil end are also semi-overlapped with protective tapes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190208.3U CN218783645U (en) | 2022-11-30 | 2022-11-30 | Novel insulation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223190208.3U CN218783645U (en) | 2022-11-30 | 2022-11-30 | Novel insulation structure |
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| Publication Number | Publication Date |
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| CN218783645U true CN218783645U (en) | 2023-03-31 |
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| CN202223190208.3U Active CN218783645U (en) | 2022-11-30 | 2022-11-30 | Novel insulation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683683A (en) * | 2023-07-27 | 2023-09-01 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and anti-corona treatment method |
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2022
- 2022-11-30 CN CN202223190208.3U patent/CN218783645U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116683683A (en) * | 2023-07-27 | 2023-09-01 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and anti-corona treatment method |
| CN116683683B (en) * | 2023-07-27 | 2023-10-31 | 北京金风科创风电设备有限公司 | Stator, generator, wind generating set and anti-corona treatment method |
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