CN112531995B - Epoxy pouring method for motor stator and special tool thereof - Google Patents
Epoxy pouring method for motor stator and special tool thereof Download PDFInfo
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- CN112531995B CN112531995B CN202011354514.9A CN202011354514A CN112531995B CN 112531995 B CN112531995 B CN 112531995B CN 202011354514 A CN202011354514 A CN 202011354514A CN 112531995 B CN112531995 B CN 112531995B
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- stator
- inner core
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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
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
Abstract
The application relates to a special epoxy pouring tool for a motor stator, which comprises a base, an inner core and a top plate, wherein the base is disc-shaped, and the top surface of the base is horizontally arranged; the inner core is in a solid cylinder shape and is coaxially connected to the upper end of the base; the roof is discoid, and the coaxial mounting hole that is equipped with on it is used for the coaxial coupling to the upper end periphery of inner core, and the interior week of mounting hole and the periphery of inner core laminate mutually, still is equipped with the hole of pouring into on the roof. When carrying out insulation treatment to the stator, inlay the stator earlier in the motor casing, on placing the base with the motor casing is vertical afterwards to make the stator cup joint on the inner core, afterwards, pour into epoxy from the upper end department of motor casing, utilize epoxy cladding stator, with the insulation that realizes the stator, this in-process, the inner core occupies certain space, and this space is used for supplying the rotor installation.
Description
Technical Field
The application relates to the field of motor production, in particular to a motor stator epoxy perfusion method and a special tool thereof.
Background
The motor stator is an important component of a motor such as a generator and a starter. Referring to fig. 1, the stator is coaxially embedded in a motor housing 11, and generally, the outer periphery of the stator is in interference fit with the inner periphery of the motor housing 11, and the stator mainly includes an iron core 12 and a winding 13. The winding 13 is a general term for a phase or an entire electromagnetic circuit formed by a plurality of coils or coil groups.
After the stator is assembled, insulation treatment, namely paint dipping, is usually required, after the stator is drained, the stator is dipped again and finally placed in an oven for drying so as to coat the stator with the insulation paint, and then the insulation requirement of the stator is met.
In view of the above-mentioned related technologies, the inventor believes that the current society has more and more important environmental protection, when the stator is produced by using the paint dipping process, the insulating paint is volatile in the production process, toxic gas is generated, and a pollution treatment device is required to be configured to timely and effectively treat the toxic gas, but the pollution treatment device is expensive and is not beneficial to the control of the production cost of the motor.
Disclosure of Invention
In order to reduce the production cost of the motor, the application provides a motor stator epoxy pouring method and a special tool thereof.
First aspect, the application provides a special frock of motor stator epoxy fills, adopts following technical scheme:
the utility model provides a special frock of motor stator epoxy fills, includes:
the top surface of the base is horizontally arranged and used for supporting the motor shell and enabling the axis of the motor shell to be vertical; and
the inner core is connected with the base, is cylindrical, has a vertical axis, and is attached to the inner periphery of the stator at the outer periphery.
By adopting the technical scheme, when the stator is subjected to insulation treatment, the stator is embedded into the motor shell, then the motor shell is vertically placed on the base, the stator is sleeved on the inner core, then epoxy resin is injected from the upper end of the motor shell, and the stator is coated by the epoxy resin to realize the insulation of the stator, wherein the inner core occupies a certain space which is used for mounting the rotor;
the insulation of the stator is realized by epoxy filling, expensive pollution treatment equipment is not required to be configured, and the production cost of the motor is favorably controlled.
Optionally, the coefficient of expansion of the inner core is greater than the coefficient of expansion of the stator.
Through adopting above-mentioned technical scheme, motor casing and stator are installed to the frock after to before pouring epoxy, preheat motor casing, stator and frock, after the thermal expansion, make interference fit between the periphery of inner core and the interior week of stator, pour into epoxy afterwards, receive blockking of inner core, no epoxy in the interior week of stator, in order to guarantee the cooperation between stator and the rotor.
Optionally, hoops are coaxially arranged on the peripheries of the two ends of the inner core, the distance between the two opposite end faces of the hoops is not less than the axial length of the stator core, and the expansion coefficient of the hoops is equal to that of the stator.
Through adopting above-mentioned technical scheme, in the stator, the both ends of winding are stretched out from the both ends of iron core, and the periphery of hoop is just to the winding stretch out the one end internal periphery of iron core, and when preheating motor casing, stator and frock, hoop, motor casing and the synchronous inflation of stator avoid extruding the winding.
Optionally, the method further includes:
the top plate is sleeved on the periphery of the upper end of the inner core, the bottom surface of the top plate is horizontally arranged, and the bottom surface is used for abutting against the upper end of the motor shell;
the motor casing is characterized in that a filling hole is formed in the top plate, the filling hole vertically penetrates through the top plate, and the filling hole is opposite to the inside of the motor casing.
Through adopting above-mentioned technical scheme, when epoxy pours into, the gas in the motor casing spills over, produces the bubble, and the bubble come-up, and when the bubble contacted the bottom surface to the roof, the bubble broke to reduce the bubble, epoxy solidifies the back, reduces the cavity that produces because of the bubble in the epoxy.
Optionally, the bottom surface of the top plate is provided with ribs at intervals.
Through adopting above-mentioned technical scheme, when the bubble contacted the bottom surface to the roof, the fin was effectively avoided the bubble to attach to the bottom surface of roof, and then made the bubble burst.
Optionally, a positioning groove is formed in the top surface of the base, the positioning groove is annular, and the positioning groove is used for embedding the end of the motor casing;
the bottom surface department of roof is equipped with the spacing groove, the spacing groove is the annular, just the spacing groove is used for cup jointing to the tip of motor casing on.
By adopting the technical scheme, the positioning of the lower end of the motor shell on the base is realized by utilizing the positioning groove, meanwhile, the positioning between the top plate and the upper end of the motor shell is realized by utilizing the limiting groove, and meanwhile, the positioning between the motor shell and the inner stator and the inner core is realized as the top plate is sleeved on the periphery of the inner core and the inner core is arranged on the base, so that the space for installing the rotor is accurately reserved in the epoxy resin;
simultaneously, the upper end of base inlays to the motor casing in, and the lower extreme of roof inlays to the motor casing in, and then occupies partial space in the motor casing, and this space is used for supplying the end cover installation.
Optionally, a lifting ring is arranged at the upper end of the inner core.
Through adopting above-mentioned technical scheme, after motor casing and stator were installed to the frock, utilize rings hoist and mount to in handling, removal.
In a second aspect, the present application provides a method for epoxy potting of a motor stator, which adopts the following technical scheme:
the epoxy pouring method for the motor stator comprises the following steps of:
assembling, namely embedding the stator into the motor shell coaxially;
mounting, namely vertically placing a motor shell on the base, sleeving the stator on the inner core, sleeving the top plate on the inner core, and abutting the bottom surface of the top plate against the upper end of the motor shell;
pouring, namely pouring epoxy resin into the motor shell through the pouring hole;
and taking out, after the epoxy resin is solidified, firstly taking down the top plate, and then taking down the motor shell and the stator from the tool to obtain the product.
Through adopting above-mentioned technical scheme, utilize epoxy cladding stator to realize the insulation of stator, in this process, the inner core occupies certain space, and this space is used for supplying the rotor installation.
Optionally, a step is further provided between the step installation and the step perfusion:
preheating, frock, motor casing and stator preheat, the inner core is heated the inflation to make and form interference fit between the periphery of inner core and the inner periphery of stator.
Through adopting above-mentioned technical scheme, the expansion coefficient of inner core is greater than the expansion coefficient of stator, preheats the back, interference fit between the periphery of inner core and the interior circumference of stator, and the stator is interior to have epoxy to realize the cooperation between stator inner periphery and the rotor periphery.
Optionally, a step is further provided between the step of pouring and the step of taking out:
and (4) performing vacuum treatment on the motor shell, the stator and the tool injected with the epoxy resin.
By adopting the technical scheme, the vacuum treatment is carried out and the gravity is matched, so that the epoxy resin can be fully infiltrated into the holes of the stator, the epoxy resin can completely coat the stator, and the insulation of the stator can be realized.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the insulation of the stator is realized by epoxy perfusion, expensive pollution treatment equipment is not required to be configured, and the production cost of the motor is favorably controlled;
2. after the thermal expansion, the outer periphery of the inner core and the inner periphery of the stator are in interference fit, then epoxy resin is injected, the epoxy resin is blocked by the inner core, and the inner periphery of the stator is free of epoxy resin, so that the fit between the stator and the rotor is ensured.
Drawings
Fig. 1 is a schematic structural view of a motor case and a stator.
Fig. 2 is a schematic structural view of the tool in embodiment 11.
FIG. 3 is a schematic view of the structure of the top plate in example 11.
Fig. 4 is a schematic structural diagram of the tool, the motor case, and the stator in the embodiment 11.
FIG. 5 is a schematic view showing the structure of the base and the core in example 12.
FIG. 6 is a schematic view of the structure of the top plate in example 12.
Fig. 7 is a schematic structural view of the fixture, the motor case, and the stator in example 12.
Description of reference numerals: 11. a motor housing; 12. an iron core; 13. a winding; 2. a base; 21. positioning a groove; 22. a positioning ring; 3. an inner core; 31. mounting grooves; 4. a top plate; 41. mounting holes; 42. a perfusion hole; 43. a limiting groove; 44. a rib; 5. a hoop; 6. a lifting ring.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
The vacuum machine comprises a vacuum pump and a vacuum chamber, wherein an air inlet of the vacuum pump is communicated with the vacuum chamber so as to pump air in the vacuum chamber out, and further the vacuum pumping of the vacuum chamber is realized.
Referring to fig. 1, the stator is coaxially embedded in a motor casing 11, the outer periphery of the stator is in interference fit with the inner periphery of the motor casing 11, and the stator mainly includes an iron core 12 and a winding 13. The winding 13 is a general term for a phase or an entire electromagnetic circuit formed by a plurality of coils or coil groups.
The embodiment of the application discloses a special tool for a motor stator epoxy pouring method.
Example 11
Referring to fig. 2 and 3, the special tool includes a base 2, an inner core 3, and a top plate 4.
The base 2 is disc-shaped, and the top surface of the base is horizontally arranged; the inner core 3 is solid and cylindrical and is coaxially connected with the upper end of the base 2; the top plate 4 is disc-shaped, and is coaxially provided with a mounting hole 41, the mounting hole 41 is coaxially connected to the outer periphery of the upper end of the inner core 3, and the inner periphery of the mounting hole 41 is attached to the outer periphery of the inner core 3.
During the use, motor casing 11 and the stator in it are placed on base 2 to make motor casing 11's axis vertical, and motor casing 11's lower extreme butt to base 2, the stator cup joints in the periphery of inner core 3, and during the normal atmospheric temperature, be clearance fit between the stator internal periphery and the 3 peripheries of inner core, afterwards, cup joint roof 4 to the upper end periphery of inner core 3, simultaneously, the bottom surface butt of roof 4 connects to motor casing 11's upper end.
Referring to fig. 2 and 3, the top plate 4 is further provided with four pouring holes 42 on the periphery of the mounting hole 41, and the four pouring holes 42 are arranged at equal intervals along the circumferential direction of the mounting hole 41 in the present embodiment, the pouring holes 42 penetrate through the top plate 4 along the axial direction of the mounting hole 41, and the pouring holes 42 are not communicated with the mounting hole 41. Meanwhile, when the top plate 4 abuts against the upper end of the motor case 11, the pouring hole 42 faces the inside of the motor case 11.
Referring to fig. 2 and 3, the positioning groove 21 is formed in the top surface of the base 2, and the limiting groove 43 is formed in the bottom surface of the top plate 4; the positioning groove 21 and the limiting groove 43 are both annular, and when the top plate 4 is sleeved on the outer periphery of the inner core 3, the positioning groove 21 and the limiting groove 43 are both coaxial with the inner core 3.
When the motor casing 11 is used, the motor casing 11 is arranged on the base 2, at the moment, the lower end of the motor casing 11 is embedded into the positioning groove 21, and the upper end of the base 2 is embedded into the motor casing 11; roof 4 cup joints in the periphery of inner core 3, and at this moment, spacing groove 43 cup joints in the upper end of motor casing 11 to make the lower extreme of roof 4 inlay and establish to motor casing 11 in.
Referring to fig. 4, the peripheries of the upper end and the lower end of the inner core 3 are both provided with mounting grooves 31, the two mounting grooves 31 are not communicated, and the two mounting grooves 31 are coaxially sleeved with hoops 5; wherein the coefficient of expansion of the inner core 3 is greater than the coefficient of expansion of the stator, such as: the inner core 3 can be made of ABS plastic and the like, and the expansion coefficient of the hoop 5 is close to or equal to that of the stator. Such as: the hoop 5 can be made of stainless steel, silicon steel and the like. And the hoop 5 positioned below can be fixedly connected with the base 2 by welding and the like.
Meanwhile, the distance between the opposite end faces of the two hoops 5 is equal to the axial length of the iron core 12, and when the lower end of the motor casing 11 is embedded into the positioning groove 21, the iron core 12 is just located between the two hoops 5.
The upper end surface of the inner core 3 is also provided with a hanging ring 6 so as to be convenient for hoisting and carrying.
The implementation principle of the special tool for the epoxy pouring method of the motor stator in the embodiment of the application is as follows: when carrying out insulation treatment to the stator, inlay the stator earlier in motor casing 11, install motor casing 11 and the stator in it to the frock afterwards on, pour into epoxy into in to the stator through infusion hole 42, treat that epoxy solidifies the back, epoxy cladding stator realizes the insulation of stator.
Example 12, the difference from example 11 is that:
referring to fig. 5 and 6, a positioning ring 22 is coaxially embedded in the positioning groove 21, the inner periphery of the positioning ring 22 is in interference fit with the base 2, and the material of the positioning ring 22 is the same as that of the inner core 3. Meanwhile, the bottom surface of the top plate 4 is further provided with a rib 44, in this embodiment, the rib 44 is annular and is coaxially arranged on the disk.
Referring to fig. 7, when the lower end of the motor casing 11 is embedded into the positioning groove 21, the positioning ring 22 is embedded into the motor casing; and at normal temperature, the outer periphery of the positioning ring 22 is in clearance fit with the inner periphery of the motor casing 11.
The embodiment of the application also discloses a motor stator epoxy perfusion method, and the tool is applied.
Example 21
An epoxy pouring method for a motor stator comprises the following steps:
s01, assembling, namely coaxially embedding the stator into the motor shell 11;
s10, referring to fig. 4, when the tooling of the above embodiment 11 is applied, the motor casing 11 is vertically placed on the base 2, and the stator is sleeved on the inner core 3, and meanwhile, the lower end of the motor casing 11 is embedded in the positioning groove 21, and the positioning ring 22 is embedded in the motor casing 11; sleeving the top plate 4 on the inner core 3, enabling the inner periphery of the mounting hole 41 to be attached to the outer periphery of the hoop 5, and sleeving the upper end of the motor shell 11 by the limiting groove 43;
s20, preheating, namely, putting the tool, the motor shell 11 and the stator into an oven by using the hoisting ring 6, preheating at 85 ℃, and heating to expand the tool, the motor shell 11 and the stator, wherein at the moment, the outer periphery of the inner core 3 and the inner periphery of the stator form interference fit because the thermal expansion coefficient of the inner core 3 is greater than that of the stator, and meanwhile, the hoop 5 and the stator are subjected to synchronous thermal expansion because the thermal expansion coefficient of the hoop 5 is close to or equal to that of the stator, so that the hoop 5 is prevented from extruding the winding 13;
s30, pouring, namely taking the preheated tool, stator and the like out of the oven by using the lifting ring 6, and injecting epoxy resin into the motor shell 11 through the pouring hole 42, so that the stator is soaked by the epoxy resin, and the liquid level of the epoxy resin is not higher than the bottom surface of the top plate 4;
s40, performing vacuum treatment, namely, putting the tool together with the motor shell 11, the stator and the epoxy resin on the tool into a vacuum chamber of a vacuum machine by using the lifting ring 6, starting a vacuum pump to vacuumize the vacuum chamber, and standing the tool together with the motor shell 11, the stator and the epoxy resin on the tool for a period of time; when the vacuum pumping is carried out, the bubbles in the epoxy resin are accelerated to overflow upwards, the bubbles float to the liquid level and contact the convex ribs 44 on the bottom surface of the top plate 4, and then the bubbles are broken;
s50 material supplementing, after the air in the motor shell 11 overflows, the liquid level of the epoxy resin drops, at the moment, the vacuum machine is started, the epoxy resin is filled in through the filling hole 42 in a supplementing mode, the epoxy resin soaks the stator, the liquid level of the epoxy resin is not higher than the bottom face of the top plate 4, the vacuum pump is started again, the air in the vacuum chamber is extracted, and the upward overflow of air bubbles in the epoxy resin is accelerated; the steps are repeated for a plurality of times until the liquid level of the epoxy resin does not drop obviously;
s60, drying, taking out the tool, the stator and the like from the vacuum chamber by using the flying ring 6, putting the tool, the stator and the like into an oven, heating to 90 ℃, and preserving heat until the epoxy resin is solidified;
s70, taking out the tool, the stator and the like from the oven by using the lifting ring 6, taking down the top plate 4 after the tool, the motor shell 11 and the stator from the tool after the tool and the stator are cooled to obtain a product.
The implementation principle of the epoxy pouring method for the motor stator in the embodiment of the application is as follows: by utilizing the difference of the thermal expansion coefficients between the inner core 3 and the stator, the interference fit is formed between the outer periphery of the inner core 3 and the inner periphery of the stator, and no epoxy resin is arranged at the position of the positioned inner periphery, so that the fit between the inner periphery of the stator and the outer periphery of the rotor is realized;
meanwhile, the base 2 and the top plate 4 both extend into the motor shell 11 to occupy partial space, so that space is provided for the installation of subsequent end covers.
Example 22 differs from example 21 in that:
after the step S01 is assembled, the method further includes:
s02, preparing an epoxy resin film, wherein the epoxy resin film is annular, the inner diameter of the epoxy resin film is equal to the outer diameter of the hoop 5, and the outer diameter of the epoxy resin film is equal to the inner diameter of the motor shell 11;
s10, referring to fig. 7, with the application of the tooling of the above embodiment 12, first, the prepared epoxy resin film is sleeved on the periphery of the inner core 3 and is tiled on the base 2, then, the motor casing 11 is vertically placed on the base 2, the lower end of the motor casing 11 is embedded into the positioning groove 21, and the positioning ring 22 is embedded into the motor casing 11; the top plate 4 is sleeved on the inner core 3, the inner periphery of the mounting hole 41 is attached to the outer periphery of the hoop 5, and meanwhile, the limiting groove 43 is sleeved on the upper end of the motor shell 11.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. The utility model provides a special frock of motor stator epoxy fills which characterized in that includes:
the top surface of the base (2) is horizontally arranged and used for supporting the motor casing (11) and enabling the axis of the motor casing (11) to be vertical; and
the inner core (3) is connected with the base (2), is cylindrical, has a vertical axis, and is attached to the inner periphery of the stator at the outer periphery;
the expansion coefficient of the inner core (3) is larger than that of the stator;
hoops (5) are coaxially arranged on the peripheries of two ends of the inner core (3), the distance between the opposite end faces of the two hoops (5) is not smaller than the axial length of the stator core (12), and the expansion coefficient of each hoop (5) is equal to that of the stator;
further comprising:
the top plate (4) is sleeved on the periphery of the upper end of the inner core (3), the bottom surface of the top plate is horizontally arranged, and the bottom surface is used for abutting against the upper end of the motor shell (11);
a pouring hole (42) is formed in the top plate (4), the pouring hole (42) vertically penetrates through the top plate (4), and the pouring hole (42) is opposite to the inside of the motor shell (11);
a positioning groove (21) is formed in the top surface of the base (2), the positioning groove (21) is annular, and the positioning groove (21) is used for embedding the end part of the motor shell (11);
the bottom surface department of roof (4) is equipped with spacing groove (43), spacing groove (43) are the annular, just spacing groove (43) are used for cup jointing to the tip of motor casing (11).
2. The special epoxy pouring tool for the motor stator according to claim 1, wherein the special epoxy pouring tool comprises: the bottom surface of the top plate (4) is provided with ribs (44) at intervals.
3. The special epoxy pouring tool for the motor stator according to claim 1, wherein the special epoxy pouring tool comprises: the upper end of the inner core (3) is provided with a hanging ring (6).
4. The epoxy pouring method for the motor stator is applied to the tool of any one of claims 1 to 3, and is characterized by comprising the following steps of:
assembling, namely embedding the stator into the motor shell (11) coaxially;
mounting, wherein a motor shell (11) is vertically placed on the base (2), a stator is sleeved on the inner core (3), the top plate (4) is sleeved on the inner core (3), and the bottom surface of the top plate (4) is abutted to the upper end of the motor shell (11);
pouring, namely injecting epoxy resin into the motor shell (11) through the pouring hole (42);
and taking out, after the epoxy resin is solidified, firstly taking down the top plate (4), and then taking down the motor shell (11) and the stator from the tool to obtain the product.
5. The epoxy injection method for the stator of the motor as claimed in claim 4, wherein the steps of installing and injecting are further provided with the steps of:
preheating, frock, motor casing (11) and stator preheat, inner core (3) are heated the inflation to make and form interference fit between the periphery of inner core (3) and the interior circumference of stator.
6. The epoxy potting method for a motor stator of claim 4, wherein: the step of filling and the step of taking out are also provided with the following steps:
and (3) performing vacuum treatment on the motor shell (11), the stator and the tool injected with the epoxy resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011354514.9A CN112531995B (en) | 2020-11-27 | 2020-11-27 | Epoxy pouring method for motor stator and special tool thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011354514.9A CN112531995B (en) | 2020-11-27 | 2020-11-27 | Epoxy pouring method for motor stator and special tool thereof |
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| Publication Number | Publication Date |
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| CN112531995A CN112531995A (en) | 2021-03-19 |
| CN112531995B true CN112531995B (en) | 2021-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011354514.9A Active CN112531995B (en) | 2020-11-27 | 2020-11-27 | Epoxy pouring method for motor stator and special tool thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104272566A (en) * | 2012-04-27 | 2015-01-07 | 利莱森玛电机公司 | Method for potting a stator |
| CN106655662A (en) * | 2017-01-10 | 2017-05-10 | 广东力好科技股份有限公司 | Glue pouring device and glue pouring process for motor stator |
| CN207053345U (en) * | 2017-05-16 | 2018-02-27 | 雷勃电气（苏州）有限公司 | A kind of epoxy potting structure of surface-mount type high-speed permanent magnet motor |
| CN210608853U (en) * | 2019-08-01 | 2020-05-22 | 北京精密机电控制设备研究所 | Tool for encapsulating motor stator and encapsulating system for motor stator |
| CN210780469U (en) * | 2019-08-21 | 2020-06-16 | 新乡市恒润机电有限公司 | Simple vacuum filling and sealing device for motor |
-
2020
- 2020-11-27 CN CN202011354514.9A patent/CN112531995B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104272566A (en) * | 2012-04-27 | 2015-01-07 | 利莱森玛电机公司 | Method for potting a stator |
| CN106655662A (en) * | 2017-01-10 | 2017-05-10 | 广东力好科技股份有限公司 | Glue pouring device and glue pouring process for motor stator |
| CN207053345U (en) * | 2017-05-16 | 2018-02-27 | 雷勃电气（苏州）有限公司 | A kind of epoxy potting structure of surface-mount type high-speed permanent magnet motor |
| CN210608853U (en) * | 2019-08-01 | 2020-05-22 | 北京精密机电控制设备研究所 | Tool for encapsulating motor stator and encapsulating system for motor stator |
| CN210780469U (en) * | 2019-08-21 | 2020-06-16 | 新乡市恒润机电有限公司 | Simple vacuum filling and sealing device for motor |
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| Publication number | Publication date |
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| CN112531995A (en) | 2021-03-19 |
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