CN111917213B - Insulation structure suitable for low-voltage high-power-density switch reluctance motor and preparation process - Google Patents
Insulation structure suitable for low-voltage high-power-density switch reluctance motor and preparation process Download PDFInfo
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- CN111917213B CN111917213B CN202010855251.3A CN202010855251A CN111917213B CN 111917213 B CN111917213 B CN 111917213B CN 202010855251 A CN202010855251 A CN 202010855251A CN 111917213 B CN111917213 B CN 111917213B
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- stator core
- winding
- core wire
- insulation structure
- reluctance motor
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- 238000009413 insulation Methods 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 78
- 239000004020 conductor Substances 0.000 claims abstract description 32
- 239000002966 varnish Substances 0.000 claims abstract description 11
- 230000017525 heat dissipation Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 11
- 239000003973 paint Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000004760 aramid Substances 0.000 claims description 4
- 229920003235 aromatic polyamide Polymers 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000004642 Polyimide Substances 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- 238000003490 calendering Methods 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005452 bending Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—Applying solid insulation to windings, stators or rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/48—Fastening of windings on the stator or rotor structure in slots
- H02K3/487—Slot-closing devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
The invention relates to the technical field of switched reluctance motors and discloses an insulation structure suitable for a low-voltage high-power-density switched reluctance motor and a preparation process thereof. The bottom surface of the stator core wire slot is coated with a heat conducting material layer, a ground insulating layer is paved on the heat conducting material layer, and the ground insulating layer bypasses the winding and is attached to the winding to be folded into the stator core wire slot; the winding is formed by adopting electromagnetic wires in a flat winding mode, and the winding is abutted against the stator core wire slot by the slot wedge; the stator core and windings are both impregnated with an insulating varnish. According to the invention, through improving the winding mode of the electromagnetic wire winding, the insulation and heat conduction structure in the stator core wire slot is provided, the insulation structure is arranged in the extremely small stator core wire slot space, and meanwhile, the heat dissipation requirement of the high-power density motor can be met, so that the application is convenient and fast for the low-voltage high-power density reluctance motor.
Description
Technical Field
The invention relates to the technical field of switched reluctance motors, in particular to an insulation structure suitable for a low-voltage high-power-density switched reluctance motor and a preparation process.
Background
In a switched reluctance motor, the design of high power density can lead the motor to generate a large amount of heat, and the safe and stable work of the switched reluctance motor can be ensured only by effectively radiating the heat of the switched reluctance motor. The existing insulation structure technology mainly meets the insulation requirement of the track traffic motor, is suitable for the switch reluctance motor with rated voltage level less than 500V to cause great insulation waste, the track traffic motor generally adopts a distributed winding, and has a complex insulation structure without considering the heat conduction performance of the insulation structure, so the insulation structure technology is not suitable for the switch reluctance motor; meanwhile, when the gap between the winding and the stator teeth of the switch reluctance motor is smaller, the space reserved for insulation wrapping is very limited, and the insulation structure is difficult to fully set. The above reasons cause the performance loss of the current voltage and high power switch reluctance motor on an insulation structure.
Therefore, the insulation structure of the existing low-voltage high-power switch reluctance motor does not reach the ideal standard, and needs to be improved and optimized to obtain a more reasonable technical scheme, so that the defects in the prior art are overcome.
Disclosure of Invention
In order to overcome the defects of the prior art mentioned in the above description, the invention provides an insulation structure suitable for a low-voltage high-power-density switch reluctance motor, and aims to improve an insulation arrangement structure in the switch reluctance motor, and complete and effective insulation structures are arranged in gaps between narrower motor windings and stator teeth, so that the insulation structure is suitable for the characteristics of the low-voltage motor and reduces insulation waste; meanwhile, the characteristic of large heating value of the high-power density reluctance motor is considered, so that good temperature resistance grade can be achieved, and good heat conducting performance is shown.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The insulation structure suitable for the low-voltage high-power-density switch reluctance motor comprises a stator core, wherein a plurality of stator core wire slots are formed in the inner wall surface of the stator core, and windings are arranged in the stator core wire slots. The bottom surface of the stator core wire slot is coated with a heat conducting material layer, a ground insulating layer is paved on the heat conducting material layer, and the ground insulating layer bypasses the winding and is attached to the winding to be folded into the stator core wire slot; the winding is formed by adopting electromagnetic wires in a flat winding mode, and the winding is abutted against the stator core wire slot by the slot wedge; the stator core and windings are both impregnated with an insulating varnish.
Above-mentioned disclosed insulation structure has reduced the bundling of winding, realizes heat conduction, insulation respectively through setting up heat conduction material layer and insulating layer to ground in stator core wire casing for high power density's switched reluctance motor can be safe operation for a long time in the course of the work, has improved radiating efficiency when guaranteeing the safety.
Further, the ground insulating layer disclosed in the above technical scheme is optimized, and the following specific feasible scheme is given as follows: the ground insulating layer is made of calendered aromatic polyamide insulating paper.
Still further, because the stator core wire casing is limited in size, all need restrict including setting up heat conduction material layer and insulating layer to ground, optimize the setting of insulating layer to ground here, specifically: the thickness of the insulating layer to the ground is 0.1-0.5 mm.
Further, the heat conducting material disclosed in the above technical solution adopts a high heat conducting material, and specifically, a specific feasible solution is given here: the heat conducting material layer adopts a single-component heat-cured organosilicon adhesive.
Further, in order to improve the insulation effect, the insulating paint disclosed in the above technical solution is optimized, and a specific feasible scheme is given here: the insulating paint is organic silicon impregnating varnish.
Further, in order to improve the insulation performance of the winding, the adopted electromagnetic wire is optimized, and the following specific and feasible scheme is given as follows: the electromagnetic wire adopts 240-grade aromatic polyimide enameled flat copper wire.
Still further, the setting mode of the windings is continuously optimized, the number of the windings in the stator core wire slots is more than or equal to two, and heat dissipation gaps are reserved between adjacent windings.
The invention also discloses a corresponding insulation structure preparation process, and the insulation structure is described.
The preparation process of the insulation structure suitable for the low-voltage high-power-density switch reluctance motor comprises the following steps:
A heat conducting material layer is coated at the bottom of the stator core wire slot in a scraping mode;
a ground insulating layer is paved in the stator core wire slot;
flattening the electromagnetic wire into a shape to obtain a winding, arranging the winding in a stator core wire slot, bending the grounding insulating layer to attach the winding and fold the winding into the stator core wire slot, and arranging a slot wedge to tightly support the winding;
Heat preservation is carried out on the stator core provided with the windings in a heating environment higher than 100 ℃ so as to solidify the heat conduction material;
the stator core provided with the windings is impregnated with an insulating varnish under vacuum.
Further, in the above method, for the heat conducting material layer coated on the slot bottom of the slot of the stator core, during specific operation, the heat conducting material is coated in one direction and air bubbles are avoided.
In the method, the heating environment of the stator core is refined, and the stator core provided with the winding is subjected to heat preservation for 1h in the environment of 130 ℃ so as to solidify the heat conducting material.
Compared with the prior art, the invention has the following beneficial effects:
According to the switch reluctance motor insulation structure, through improving the winding mode of the electromagnetic wire winding, the insulation and heat conduction structure in the stator core wire slot is arranged in the extremely small stator core wire slot space, meanwhile, the heat dissipation requirement of a high-power density motor can be met, and convenience in application is brought to the reluctance motor with low voltage and high power density.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a partial structure of a slot of a stator core.
Fig. 2 is a schematic view of a flat winding structure of an electromagnetic wire.
FIG. 3 is a schematic view of the structure of section A-A in FIG. 2.
Fig. 4 is a schematic process flow diagram for preparing the insulating structure.
In the above figures, the meaning of each symbol is: 1. a stator core; 2. a winding; 3. stator core wire slot; 4. a layer of thermally conductive material; 5. a ground insulating layer; 6. a slot wedge; 7. electromagnetic wire.
Detailed Description
The invention is further illustrated by the following description of specific embodiments in conjunction with the accompanying drawings.
It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention. Specific structural and functional details disclosed herein are merely representative of example embodiments of the invention. This invention may, however, be embodied in many alternate forms and should not be construed as limited to the embodiments set forth herein.
Example 1
The embodiment provides an insulation structure for the low-voltage high-power-density switch reluctance motor, so that the motor can be kept safely insulated in the working process, and a large amount of heat generated in the working process of the motor is timely led out, so that the working temperature of the motor is kept within a reasonable range.
Specifically, as shown in fig. 1, fig. 2 and fig. 3, the insulation structure suitable for a low-voltage high-power-density switched reluctance motor disclosed in the embodiment includes a stator core 1, a plurality of stator core wire slots 3 are provided on the inner wall surface of the stator core 1, and windings 2 are provided in the stator core wire slots 3. The bottom surface of the stator core wire slot 3 is coated with a heat conducting material layer 4, a ground insulating layer 5 is paved on the heat conducting material layer 4, and the ground insulating layer 5 bypasses the winding 2 and is folded into the stator core wire slot 3 by attaching the winding 2; the winding 2 is formed by adopting electromagnetic wires 7 in a flat winding mode, and the winding 2 is abutted against the stator core wire slot 3 by the slot wedge 6; both the stator core 1 and the windings 2 are impregnated with an insulating varnish.
The insulation structure disclosed above reduces the binding of the winding 2, realizes heat conduction and insulation by arranging the heat conduction material layer 4 and the insulating layer 5 to the ground in the stator core wire slot 3, improves the heat dissipation efficiency while ensuring the safety, and ensures that the high-power-density switch reluctance motor can safely work for a long time in the working process.
In this embodiment, the ground insulating layer 5 disclosed in the above technical solution is optimized, and the following specific possible solutions are given: the ground insulating layer 5 is made of calendered aromatic polyamide insulating paper.
Because the stator core wire slot 3 is limited in size, the heat conducting material layer and the ground insulating layer 5 are arranged inside the stator core wire slot, the setting of the ground insulating layer 5 is optimized, and the stator core wire slot is specific: the thickness of the insulating layer 5 is 0.1-0.5 mm.
Preferably, the thickness of the aromatic polyamide insulating paper used in this embodiment is 0.18mm, which has high inherent dielectric strength, mechanical toughness, flexibility and rebound resilience, and the breakdown voltage is about 5940V, which is much higher than 8 times the safety margin of the motor (less than 500×8=4000V). The insulating paper has excellent high-temperature dielectric property, and the dielectric strength at 240 ℃ is still about 90% of that at room temperature.
The heat conducting material disclosed in the above technical scheme adopts a high heat conducting material, and specifically, a specific feasible scheme is given here: the heat conducting material layer 4 adopts a single-component heat-cured organosilicon adhesive.
Preferably, the heat conducting material adopted in the embodiment has the characteristics of convenient use, excellent high temperature resistance, high heat conductivity coefficient, good chemical stability and the like, and the heat conductivity coefficient is 0.6W/mK which is far higher than that of common impregnating varnish (about 0.2-0.3W/mK). The organosilicon adhesive selected in the embodiment has good compatibility with the organosilicon impregnating varnish.
In order to improve the insulation effect, the insulating paint disclosed in the above technical scheme is optimized, and a specific feasible scheme is given here: the insulating paint is C-level solvent-free organosilicon impregnating paint. The impregnating varnish adopted in the embodiment has the advantages of no byproducts in the vulcanization process, extremely small shrinkage, deep vulcanization and the like, and is suitable for the VPI impregnation process. The paint has excellent electrical performance and temperature resistance.
In order to improve the insulation performance of the winding 2, the adopted electromagnetic wire 7 is optimized, and the following specific and feasible scheme is given as follows: the electromagnetic wire 7 is a 240-grade aromatic polyimide enameled flat copper wire with a C-grade temperature resistance grade.
Preferably, the thickness of a paint film of the electromagnetic wire 7 adopted in the embodiment is 2, and the 2-turn insulation of the winding is two layers, so that the high-temperature turn-to-turn withstand voltage can reach 3000V, and is higher than the turn-to-turn withstand voltage requirement.
In this embodiment, the electromagnetic wire 7 is formed by flat winding, and the electromagnetic wire 7 is provided with an insulating layer, namely, the winding 2-turn insulation. Based on the design thought, the insulation wrapping space is very limited, and the linear section of the winding 2 is not wrapped with insulation materials; in order to enhance the heat conduction capability, the end parts of the winding 2 are not wrapped with insulating materials, so that the heat exchange capability of forced air and the end winding 2 can be enhanced, and heat is more easily conducted out.
In this embodiment, the arrangement mode of the windings 2 is continuously optimized, the number of the windings 2 in the stator core slot 3 is greater than or equal to two, and heat dissipation gaps are reserved between adjacent windings 2.
Preferably, two windings 2 are arranged in each stator core slot 3.
Example 2
As shown in fig. 4, embodiment 1 discloses an insulation structure of a switched reluctance motor, and this embodiment discloses a corresponding manufacturing process, and will now be described.
The preparation process of the insulation structure suitable for the low-voltage high-power-density switch reluctance motor comprises the following steps:
S01: a heat conducting material layer 4 is coated at the bottom of the stator core wire slot 3;
S02: a ground insulating layer 5 is paved in the stator core wire slot 3;
S03: the electromagnetic wire 7 is flattened into a shape to obtain a winding 2, the winding 2 is arranged in the stator core wire slot 3, the grounding insulating layer is attached to the winding 2 and folded into the stator core wire slot 3, and the slot wedge 6 is arranged to tightly support the winding 2;
s04: the stator core 1 provided with the windings 2 is insulated in a heating environment higher than 100 ℃ to solidify the heat conducting material;
s05: the stator core 1 provided with the windings 2 is impregnated with an insulating varnish under vacuum.
In the above method, for the heat conducting material layer 4 is scraped on the bottom of the slot 3 of the stator core, in a specific operation, the heat conducting material is scraped in one direction and air bubbles are prevented from being introduced.
In the above method, the heating environment of the stator core 1 is elaborated, and the stator core 1 provided with the winding 2 is subjected to heat preservation for 1h in the environment of 130 ℃ so as to solidify the heat conducting material.
The embodiments of the present invention are exemplified above, but the present invention is not limited to the above-described alternative embodiments, and those skilled in the art can obtain various other embodiments by any combination of the above-described embodiments, and any person can obtain various other embodiments without departing from the scope of the present invention. The above detailed description should not be construed as limiting the scope of the invention, which is defined in the claims and the description may be used to interpret the claims.
Claims (7)
1. The insulation structure suitable for the low-voltage high-power-density switch reluctance motor comprises a stator core (1), wherein a plurality of stator core wire slots (3) are formed in the inner wall surface of the stator core (1), and windings (2) are arranged in the stator core wire slots (3); the method is characterized in that: the bottom surface of the stator core wire slot (3) is coated with a heat conducting material layer (4), a ground insulating layer (5) is paved on the heat conducting material layer (4), and the ground insulating layer (5) bypasses the winding (2) and is attached to the winding (2) to be folded into the stator core wire slot (3); the winding (2) is formed by adopting electromagnetic wires (7) in a flat winding mode, and the winding (2) is abutted against the stator core wire slot (3) by the slot wedge (6); the stator core (1) and the winding (2) are both impregnated with insulating paint;
The ground insulating layer (5) is made of calendered aromatic polyamide insulating paper;
the thickness of the insulating layer (5) to the ground is 0.1-0.5 mm;
The number of windings (2) in the stator core wire slot (3) is more than or equal to two, and heat dissipation gaps are reserved between adjacent windings (2).
2. The insulation structure for a low-voltage high-power-density switched reluctance motor according to claim 1, wherein: the heat conducting material layer (4) adopts a single-component heat-cured organosilicon adhesive.
3. The insulation structure for a low-voltage high-power-density switched reluctance motor according to claim 1, wherein: the insulating paint is organic silicon impregnating varnish.
4. The insulation structure for a low-voltage high-power-density switched reluctance motor according to claim 1, wherein: the electromagnetic wire (7) adopts 240-grade aromatic polyimide enameled flat copper wires.
5. A process for preparing an insulation structure suitable for a low voltage high power density switched reluctance motor for preparing the insulation structure of claim 1, comprising:
a heat conducting material layer (4) is coated at the bottom of the stator core wire slot (3);
A ground insulating layer (5) is paved in the stator core wire slot (3);
Flattening the electromagnetic wire (7) into a shape to obtain a winding (2), arranging the winding in the stator core wire slot (3), bending the grounding insulating layer attached winding (2) and folding the winding into the stator core wire slot (3), and arranging a slot wedge (6) to tightly prop the winding (2);
The stator core (1) provided with the windings (2) is insulated in a heating environment higher than 100 ℃ to solidify the heat conducting material;
The stator core (1) provided with the windings (2) is impregnated with an insulating varnish under vacuum.
6. The process for preparing the insulation structure applicable to the low-voltage high-power-density switch reluctance motor according to claim 5, wherein the heat conducting material layer (4) is scraped on the bottom of the stator core wire slot (3), and is characterized in that:
The heat conductive material is scraped in one direction and the introduction of bubbles is avoided.
7. The process for preparing an insulation structure suitable for a low-voltage high-power-density switched reluctance motor according to claim 5, wherein the process comprises the following steps:
and (3) placing the stator core (1) provided with the winding (2) in a 130 ℃ environment for heat preservation for 1h so as to solidify the heat conducting material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855251.3A CN111917213B (en) | 2020-08-24 | 2020-08-24 | Insulation structure suitable for low-voltage high-power-density switch reluctance motor and preparation process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010855251.3A CN111917213B (en) | 2020-08-24 | 2020-08-24 | Insulation structure suitable for low-voltage high-power-density switch reluctance motor and preparation process |
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| CN111917213A CN111917213A (en) | 2020-11-10 |
| CN111917213B true CN111917213B (en) | 2024-08-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212392727U (en) * | 2020-08-24 | 2021-01-22 | 成都中车电机有限公司 | Insulation structure suitable for low-voltage high-power density switch reluctance motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012196000A (en) * | 2011-03-15 | 2012-10-11 | Aichi Elec Co | Electric motor |
| JP6508682B2 (en) * | 2016-03-08 | 2019-05-08 | 本田技研工業株式会社 | Stator winding and stator |
| CN205846910U (en) * | 2016-07-14 | 2016-12-28 | 浙江正田电机制造有限公司 | A kind of generator stator of vehicle assembly |
| JP6938933B2 (en) * | 2017-02-03 | 2021-09-22 | トヨタ自動車株式会社 | Rotating machine stator |
| CN207117343U (en) * | 2017-08-22 | 2018-03-16 | 锦州富山密封科技有限公司 | New-energy automobile is molded winding with permasyn morot |
| KR102588529B1 (en) * | 2018-05-17 | 2023-10-13 | 현대모비스 주식회사 | Stator assembly for hairpin winding motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN212392727U (en) * | 2020-08-24 | 2021-01-22 | 成都中车电机有限公司 | Insulation structure suitable for low-voltage high-power density switch reluctance motor |
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