CN112953050B - Integral paint-dipping encapsulated motor stator - Google Patents
Integral paint-dipping encapsulated motor stator Download PDFInfo
- Publication number
- CN112953050B CN112953050B CN202110315928.9A CN202110315928A CN112953050B CN 112953050 B CN112953050 B CN 112953050B CN 202110315928 A CN202110315928 A CN 202110315928A CN 112953050 B CN112953050 B CN 112953050B
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- Prior art keywords
- coil
- stator
- insulating
- motor
- straightway
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/10—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
- H02K3/32—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
Abstract
The invention discloses a motor stator with an integral paint dipping, filling and insulating system, wherein a discontinuous straight line section insulating clamping groove is arranged in a groove, a sealing insulating cover is arranged at the end part of the groove, a winding part forms an internal porous closed space, small gaps in the winding are filled and a coil is fixed by dipping the motor stator with conventional dipping resin with good fluidity and low thermal conductivity, and then the motor stator is dipped with potting resin with high thermal conductivity and poor fluidity, so that the stator insulating system with high thermal conductivity and no air gap is finally realized. The invention is applied to the stator of a medium-high voltage forming coil motor, reduces the insulation quantity of the motor to the ground, cancels the anti-corona measures of low resistance band, high resistance band and the like, greatly improves the heat conduction performance of the insulation part of the coil, and also improves the reliability and the vibration noise performance of the motor because the stator is encapsulated into a whole.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to an integral paint-dipping encapsulated motor stator with high heat conduction characteristic and no air gap.
Background
At present, a stator of a medium-high voltage motor adopting a formed coil is generally insulated by vacuum pressure dip coating (VPI), the coil is firstly wrapped by an insulating tape (generally various mica tapes) with enough thickness on the outside, then the coil is embedded into a slot, the coil and the slot are slightly tightly matched, a slot wedge is driven into a slot opening, and finally, the slot wedge is soaked in insulating resin and is externally baked. For a motor with higher voltage, the local discharge caused by the air gap in the insulating structure is worried about, a low stop band needs to be bound on the outer layer of the straight-line coil, and high-resistance band transition is needed at the end part.
The above insulation structure has the following disadvantages: a. in order to fill up the small gaps, the impregnating resin must have a low viscosity in order to obtain high fluidity, limiting the ways in which the impregnating resin can further improve its thermal conductivity by adding auxiliaries; b. due to external baking, the impregnating resin which has been impregnated into the insulation inevitably flows out more or less during the baking process, so that the generation of air gaps inside the motor insulation structure cannot be avoided; c. in order to fix the slot wedge, a fixing slot needs to be arranged at the top end of the iron core tooth, so that the magnetic conduction area of the tooth part is further reduced; d. the insulating structure and the process are complex, and a mica tape, a low-resistance band, a high-resistance band, various filler strips and binding and fixing structures are required to be bound for multiple times.
At present, the technology of impregnating and encapsulating the whole of the motor coil (including the straight line segment and the end part) into a whole by directly adopting the impregnating resin is also available, but the impregnating resin is a balance between flowability and thermal conductivity, the thermal conductivity is still limited, and the main insulation still needs to be wrapped outside.
Disclosure of Invention
Aiming at the defects that the traditional VPI insulation structure has poor heat conduction performance, cannot thoroughly eliminate air gaps inside the insulation, reduces the performance of a motor due to groove type, has a complex insulation structure and process and the like, the invention provides a stator insulation system for integral paint dipping encapsulation based on the performance of the existing insulation material, and realizes the combination of high heat conduction and no air gap of the stator of the motor.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides an integral paint-dipping encapsulation motor stator, includes stator core and coil winding, stator core's groove have wedge-shaped notch, the notch width is less than groove body width, coil winding's straightway conductor is fixed in through tip insulating clamping groove and straightway insulating clamping groove in stator core's the inslot, tip insulating clamping groove and straightway insulating clamping groove are along the axial segmentation, leak the notch and simultaneously leak the sky along the axial segmentation in the notch, are provided with the backing strip between the layer adjacent straightway conductor, and coil winding's non-leading-out terminal and leading-out terminal are provided with non-outlet end cover and outlet end cover respectively, and non-outlet end cover and outlet end cover seal coil winding in an integral space.
The integral paint-dipping encapsulating motor stator is characterized in that the straight-line section insulating clamping groove is made of insulating materials, the axial length of the groove opening is larger than that of the inner part of the groove, and the groove bottom is of an opening structure.
The end insulating clamping groove structure of the integral paint-dipping encapsulated motor stator is similar to that of a straight-line section insulating clamping groove, the inner part of the groove is flush with the end part of a stator core, and a gap is reserved between the part of the notch, extending out of the end part of the core, and a coil for fixing a non-outgoing line end cover and an outgoing line end cover.
The integral paint-dipping encapsulating motor stator is characterized in that a straight-line section conductor of the integral paint-dipping encapsulating motor stator is generally of a multi-turn structure and is composed of a copper conductor, conductor insulation and a coil binding belt, the coil binding belt is used for binding the multi-turn conductor into a whole, and the narrow space in the coil is ensured to be filled with impregnating resin when the impregnating resin is soaked for the first time.
A whole paint dipping embedment motor stator, earlier the coil externally shaping and ligature area of ligature coil, with the coil embedded notch in, then utilize its elastic deformation to go into coil diagonal segment from the open end with tip insulation draw-in groove and straightway insulation draw-in groove to push away in the notch one by one.
The integral paint-dipping encapsulating motor stator is characterized in that straight-line section insulating clamping grooves are of a left-right symmetrical structure formed by integrally pouring insulating materials, and the axial length of a notch part is 3 times of the groove bottom.
The integral paint-dipping encapsulating motor stator is characterized in that a non-outlet end cover and an outlet end cover of the integral paint-dipping encapsulating motor stator are made of non-magnetic metal materials or insulating materials.
The beneficial effects of the invention are: firstly, filling insulators in the groove opening along the axial direction in a segmented manner, and firstly, utilizing the traditional insulation impregnating resin and VPI (vacuum pressure impregnation) process to reliably fix the coil by the aid of the filled insulators, and meanwhile, reserving a larger space in the part, which is not filled with the insulators, in the groove opening; then the end parts of the motor are sealed by using the insulating covers at the two ends, so that the cavities of the insulating part of the motor are completely sealed in a large cavity; then vertically placing the motor, and encapsulating encapsulation resin with high heat conductivity coefficient but poor fluidity in the closed cavity by adopting a VPI (vacuum pressure impregnation) process; and finally, heating and curing the potting resin under the condition that the potting resin is not covered by the motor insulation structure all the time.
By adopting twice impregnation and encapsulation, the invention greatly improves the heat conduction performance of the motor insulation straight line segment by improving the heat conduction coefficient of the encapsulation resin on the premise of ensuring the reliable fixation of the motor insulation. Through the arrangement of the sealing cavity, the potting resin is ensured to be submerged in the motor insulation structure during baking, so that an air-gap-free insulation structure is obtained. The above measures also simplify the structure and process of the motor insulation system, and simultaneously improve the performance of the motor due to the change of the groove type.
Drawings
Fig. 1 is a side view of an insulation structure of a motor of the present invention;
FIG. 2 is a cross-sectional view taken in the directions A-A and B-B of FIG. 1;
FIG. 3 is a schematic view of a slot pattern of a stator core according to the present invention;
fig. 4 is a diagram of the stator core slot inset line of the present invention;
FIGS. 5 and 6 are views of an end insulating slot according to an embodiment of the present invention;
fig. 7 and 8 are views of a straight-line section insulation slot according to an embodiment of the invention.
The various reference numbers are: the structure comprises 1-a non-outgoing line end cover, 2-a non-outgoing line end, 3-an end insulation clamping groove, 4-a straight line section insulation clamping groove, 5-a stator core, 6-a straight line section conductor, 7-an interlayer filler strip, 8-an outgoing line end, 9-an outgoing line end cover, 6.1-a copper conductor, 6.2-a conductor insulation and 6.3-a coil binding tape.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, the stator of the integral dip-coating encapsulated motor disclosed by the invention comprises a stator core 5 and a coil winding, wherein the stator core 5 is provided with a wedge-shaped notch, the opening width of the notch is smaller than the width of a slot body, an end insulating slot 3 and a straight-line insulating slot 4 are prevented from being radially separated from the notch, but the width of the notch is larger than the width of the coil winding, a straight-line conductor 6 of the coil winding is fixed in the notch of the stator core 5 through the end insulating slot 3 and the straight-line insulating slot 4, the end insulating slot 3 and the straight-line insulating slot 4 are axially segmented, the notch is sealed and is axially segmented and emptied in the notch, wherein the straight-line insulating slot 4 is made of an insulating material, the length of the notch in the axial direction is larger than that of the slot, the slot bottom is of an opening structure, and the structure of the end insulating slot 3 is similar to that of the straight-line insulating slot 4, the inside of the slot is flush with the end part of the stator core 5, a gap is reserved between the part of the notch extending out of the end part of the core and the coil for fixing a non-outgoing line end cover 1 and an outgoing line end cover 9, an interlayer filler strip 7 is arranged between two adjacent layers of linear conductors 6, a non-outgoing line end 2 and an outgoing line end 8 of the coil winding are respectively provided with the non-outgoing line end cover 1 and the outgoing line end cover 9, and the non-outgoing line end cover 1 and the outgoing line end cover 9 are fixed at two ends to seal the coil winding in an integral space. The stator of the motor is firstly soaked in conventional impregnating resin with good fluidity but low heat conductivity to fill small gaps in the motor and fix a coil winding, then potting resin with high heat conductivity coefficient but poor fluidity is filled, and all larger gaps in the notch and the end part are filled, so that the stator insulation system with high heat conductivity and no air gap is finally realized.
Referring to fig. 4 to 6, the straight-line conductor 6 is generally a multi-turn structure and is composed of a copper conductor 6.1, a conductor insulator 6.2 and a coil binding band 6.3, wherein the coil binding band 6.3 is used for binding the multi-turn conductor into a whole, and the narrow space inside the coil is ensured to be filled with impregnating resin when the first-pass impregnating resin is impregnated. The coil is formed outside and the coil binding band 6.3 is bound firstly, the coil is embedded into the notch, the end insulation clamping groove 3 and the straight-line section insulation clamping groove 4 are clamped into the coil inclined line section from the opening end through elastic deformation of the end insulation clamping groove and the straight-line section insulation clamping groove 4, and the end insulation clamping groove 3 and the straight-line section insulation clamping groove are pushed into the notch one by one. The end insulating clamping groove 3 is similar to a straight-line insulating clamping groove in structure, but the extending end part of the end insulating clamping groove is partially extended so as to fix the sealing cover, and the end insulating clamping groove is guaranteed to be flush with the end part of the iron core.
The straight-line insulating clamping groove 4 is in a bilateral symmetry structure as shown in fig. 7 and fig. 8, the length of the groove opening part along the axial direction is 3 times of that of the groove bottom, the groove bottom is provided with an opening, the width of the opening is smaller than that of the conductor, so that the conductor can be reliably fixed, but the width of the opening cannot be too narrow, otherwise, the clamping groove is difficult to sleeve a coil, and the clamping groove is generally formed by integrally pouring insulating materials.
The non-outlet end shield 1 and the outlet end shield 9 at the two ends can be made of metal materials or insulating materials, but are required to be non-magnetic. For a single-end outgoing motor, the non-outgoing end cover 1 can be made into a closed structure and fixed with the end insulating clamping groove 3 through a bolt, and the outgoing end cover 9 is provided with an incoming and outgoing line hole. For the double-side outlet motor, both sealing covers need to be provided with holes, but one end of the sealing cover needs to be closed.
When the first time of impregnating resin, the residual impregnating resin in the sealed cavity is ensured to flow out, so that the wire outlet end is generally baked downwards, and when the second time of encapsulating resin is encapsulated, the wire outlet end is ensured to be upward, and the encapsulating resin is not over the motor insulation structure, so that the encapsulating resin is filled in the whole insulation structure without air gaps. The first-time impregnating resin can adopt epoxy impregnating resin, and the second-time encapsulating resin can adopt epoxy or organosilicon resin added with metal oxide, wherein the metal oxide can improve the heat conduction and corona resistance of the resin, but can increase the viscosity and reduce the fluidity.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various changes and modifications without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (3)
1. The utility model provides an integral paint-dipping embedment motor stator, includes stator core (5) and coil winding, its characterized in that: the slot of stator core (5) have wedge-shaped notch, straightway conductor (6) of coil winding is fixed in through tip insulating slot (3) and straightway insulating slot (4) in the inslot, straightway insulating slot (4) adopt insulating material to make, have the bottom opening, straightway insulating slot (4) are insulating material monolithic casting fashioned bilateral symmetry structure, the notch part is 3 times of tank bottom along axial length, tip insulating slot (3) and straightway insulating slot (4) seal the notch simultaneously along the axial segmentation sky of leaking in the notch, straightway conductor (6) be copper conductor (6.1), conductor insulation (6.2), coil ligature area (6.3) the multiturn structure of constituteing, earlier coil shaping and ligature coil ligature area (6.3) outside, with the coil in the notch, then utilize its elastic deformation to block into coil from the open end with tip insulating slot (3) and straightway insulating slot (4) Oblique line segments are pushed into the notches one by one, an interlayer padding strip (7) is arranged between two adjacent layers of straight-line-segment conductors (6), a non-outgoing line end cover (1) and an outgoing line end cover (9) are respectively arranged at a non-outgoing line end (2) and an outgoing line end (8) of the coil winding, and the coil winding is sealed in an integral space by the non-outgoing line end cover (1) and the outgoing line end cover (9).
2. The stator of the integral dip-coating encapsulated motor as claimed in claim 1, wherein the inside of the end insulation clamping groove (3) is flush with the end of the stator core (5).
3. The integral paint-dipping encapsulated motor stator as claimed in claim 1, wherein said non-outlet end shield (1) and outlet end shield (9) are made of non-magnetic conductive metal material or insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110315928.9A CN112953050B (en) | 2021-03-24 | 2021-03-24 | Integral paint-dipping encapsulated motor stator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110315928.9A CN112953050B (en) | 2021-03-24 | 2021-03-24 | Integral paint-dipping encapsulated motor stator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112953050A CN112953050A (en) | 2021-06-11 |
| CN112953050B true CN112953050B (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110315928.9A Active CN112953050B (en) | 2021-03-24 | 2021-03-24 | Integral paint-dipping encapsulated motor stator |
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| Country | Link |
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| CN (1) | CN112953050B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113567324B (en) * | 2021-07-30 | 2023-12-05 | 华域汽车电动系统(上海)有限公司 | Inspection method for filling penetration state of impregnating varnish in motor stator slot |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5635647A (en) * | 1979-08-31 | 1981-04-08 | Toshiba Corp | Rotor for electric rotary machine |
| US4443725A (en) * | 1982-06-14 | 1984-04-17 | General Electric Company | Dynamoelectric machine stator wedge |
| JPS59222050A (en) * | 1983-05-31 | 1984-12-13 | Toshiba Corp | Cylindrical rotor |
| JPS6173533A (en) * | 1984-09-17 | 1986-04-15 | Matsushita Electric Ind Co Ltd | Stator |
| JPH06178480A (en) * | 1992-12-03 | 1994-06-24 | Toshiba Corp | Rotary electric machine |
| US7990012B2 (en) * | 2009-10-28 | 2011-08-02 | General Electric Company | Locking wedge for maintaining a winding in a slot and dynamoelectric machine incorporating same |
| CN203617811U (en) * | 2013-11-05 | 2014-05-28 | 广东美芝制冷设备有限公司 | Interphase insulating piece and motor stator provided with same |
| CN205070645U (en) * | 2015-11-12 | 2016-03-02 | 东方电气集团东风电机有限公司 | Whole VPI insulation system of motor stator |
| CN106357034B (en) * | 2016-09-21 | 2019-05-24 | 北京精密机电控制设备研究所 | A kind of stator of the permanent magnet synchronous motor for long cable drive |
| JP6994627B2 (en) * | 2016-11-28 | 2022-01-14 | パナソニックＩｐマネジメント株式会社 | motor |
| JP7260394B2 (en) * | 2019-05-21 | 2023-04-18 | ファナック株式会社 | stator |
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2021
- 2021-03-24 CN CN202110315928.9A patent/CN112953050B/en active Active
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| CN112953050A (en) | 2021-06-11 |
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