CN114244022A - Motor with stator winding isolated from conductive cooling liquid - Google Patents
Motor with stator winding isolated from conductive cooling liquid Download PDFInfo
- Publication number
- CN114244022A CN114244022A CN202111521640.3A CN202111521640A CN114244022A CN 114244022 A CN114244022 A CN 114244022A CN 202111521640 A CN202111521640 A CN 202111521640A CN 114244022 A CN114244022 A CN 114244022A
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- CN
- China
- Prior art keywords
- motor
- stator
- electric machine
- shaft
- cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004804 winding Methods 0.000 title claims abstract description 56
- 239000000110 cooling liquid Substances 0.000 title claims abstract description 20
- 230000003068 static effect Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 19
- 239000002826 coolant Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 11
- 229920006335 epoxy glue Polymers 0.000 claims description 7
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 239000004593 Epoxy Substances 0.000 claims description 2
- 238000004382 potting Methods 0.000 claims description 2
- 239000012809 cooling fluid Substances 0.000 claims 4
- 238000009413 insulation Methods 0.000 abstract description 14
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 239000000446 fuel Substances 0.000 description 5
- 239000000565 sealant Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/44—Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The application belongs to the field of motor design, and particularly relates to a motor with a stator winding isolated from conductive cooling liquid. The device includes rotor (1), stator (2) and end cover (3), wherein, the inner wall of winding (6) of stator (1) is provided with insulating bush (4), motor end cover (3) have stretch into terminal (31) stretch into of stator winding inner wall, stretch into terminal (31) with insulating bush (4) inner wall static seal. The problem of low insulation resistance of the stator winding of the motor in working in the cooling liquid is solved, the cold-state insulation resistance and the hot-state insulation resistance both reach design indexes, the bottleneck problem of the motor in use in the cooling liquid is solved, the heat dissipation of the motor is effectively solved, and the volume and weight of the motor are greatly reduced.
Description
Technical Field
The application belongs to the field of motor design, and particularly relates to a motor with a stator winding isolated from conductive cooling liquid.
Background
Traditional liquid cooling pump motor adopts air cooling's mode to cool off the motor body, and the radiating efficiency is low, and motor volume weight is big.
In recent years, in the fuel pump motor, the aviation fuel is introduced into the motor, and the aviation fuel directly contacts with a motor winding, an iron core and a bearing and takes away heat generated inside the motor through the flow of the aviation fuel inside the motor, so that the heat dissipation problem of the motor is effectively solved, the dynamic sealing structure of the conventional fuel motor is removed, and the reliability of the motor and the service life of the motor are improved. However, since the cooling liquid has conductivity, the structure cannot be applied to a liquid cooling pump motor, and the conductive liquid can permeate into the winding, so that the insulation resistance of the stator winding is reduced, and the motor cannot work normally.
In order to solve the problem, the design scheme in the prior art is to coat the end face of the winding and the inner circle of the iron core by using pouring sealant so as to achieve the purpose of isolating the cooling liquid from the conductive part of the motor, but because the epoxy glue has certain hydrophilicity and the bonding property of the epoxy glue and the insulating layer of the outgoing line is poor, a gap is inevitably generated between the outgoing line and the pouring sealant in the product processing process, when the motor works, the conductive liquid permeates into a welding spot or a winding of the motor winding along the gap between the outgoing line and the pouring sealant so as to reduce the insulation resistance of the motor, and the motor cannot work normally; meanwhile, due to the difference of the thicknesses of the pouring sealant on the iron core and the winding, after the motor works and generates heat, the epoxy glue layer is easy to crack after being heated, and conductive liquid permeates into the winding of the motor, so that the insulation resistance of the winding to the ground and between the windings is reduced, even short circuit occurs, and the motor cannot work normally.
Disclosure of Invention
In order to solve the technical problem, the application provides a motor that stator winding and electrically conductive coolant liquid are kept apart, make full use of the advantage of liquid cooling motor, make the coolant liquid get into the inside effect that plays and carry out the cooling to the motor, effectively reduce the volume weight of motor, but can not lead to winding insulating properties to descend because of the electric conductivity of coolant liquid again, guarantee that the motor still can reliably transport after introducing electrically conductive liquid and cooling the motor.
The utility model provides a motor that stator winding and electrically conductive coolant liquid keep apart, including rotor, stator and end cover, the inner wall of the winding of stator is provided with insulating bush, the motor end cover has and stretches into the end of stretching into of stator winding inner wall, stretch into the end with insulating bush inner wall static seal.
Preferably, a sealing ring is arranged between the extending end of the motor end cover and the insulating bush.
Preferably, the inner wall of the insulating bush is provided with a ring groove, and the sealing ring is at least partially arranged in the ring groove.
Preferably, the outer side of the winding and the shell are encapsulated by epoxy glue.
Preferably, a second sealing ring is arranged between the end cover and the casing of the motor.
Preferably, the two ends of the rotor are provided with retaining rings.
Preferably, a spacer is disposed between the retainer ring and the rotor.
Preferably, the motor further comprises a shaft cover, the shaft cover is arranged at the tail end of the motor shaft and connected with the casing, a flow channel is formed between the shaft cover and the tail end of the motor shaft, the inlet end of the flow channel is communicated with the cooling gap of the motor, the outlet end of the flow channel is connected with the central shaft hole of the motor shaft, and the front end of the motor shaft of the cooling liquid guider is discharged through the central shaft hole of the motor shaft.
Preferably, the motor further comprises a printed board, the printed board is arranged outside the shaft cover of the motor, the printed board interacts with position magnetic steel arranged on a motor shaft to generate a position signal, and the printed board is protected by an outer end cover at the rear end of the motor.
Preferably, the printed board and the connecting wires thereof are encapsulated and protected in the outer end cover by epoxy glue.
The problem of low insulation resistance of the stator winding of the motor in working in the cooling liquid is solved, the cold-state insulation resistance and the hot-state insulation resistance both reach design indexes, the bottleneck problem of the motor in use in the cooling liquid is solved, the heat dissipation of the motor is effectively solved, and the volume and weight of the motor are greatly reduced.
Drawings
Fig. 1 is a schematic diagram of an electric machine having stator windings isolated from a conductive coolant according to the present application.
Fig. 2 is a schematic structural diagram of a stator according to the embodiment shown in fig. 1 of the present application.
The motor comprises a rotor 1, a stator 2, an end cover 3, an extending end 31, an insulating bush 4, a sealing ring 5, a winding 6, a retainer ring 7, an adjusting gasket 8, a shaft cover 9, position magnetic steel 10, a printed board 11, an outer end cover 12, a second sealing ring 13 and a motor shaft 14.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.
In order to fully utilize the advantages of the liquid cooling motor, the cooling liquid enters the motor to play a role in cooling the motor, the volume and the weight of the motor are effectively reduced, the insulation performance of a winding cannot be reduced due to the conductivity of the cooling liquid, and the motor can still run reliably after the motor is cooled by introducing the conductive liquid.
The application provides a motor that stator winding and electrically conductive coolant liquid keep apart, as shown in fig. 1-fig. 2, including rotor 1, stator 2 and end cover 3, wherein, the inner wall of stator 1's winding 6 is provided with insulating bush 4, motor end cover 3 has and stretches into the end 31 that stretches into of stator winding inner wall, stretch into end 31 with 4 inner wall static seals of insulating bush.
Set up high strength non-metallic insulation bush between motor stator and rotor air gap to set up static seal between motor both ends end cover and bush, make motor winding and coolant liquid realize keeping apart completely from structural, prevent that the coolant liquid from permeating motor conducting part (be motor stator winding inside or winding extraction line welding point department promptly), effectively prevent the influence of coolant liquid to motor insulating property, guaranteed that armature winding's insulating property satisfies the design index, overcome the bottleneck problem that the motor used in the coolant liquid.
In some alternative embodiments, a sealing ring 5 is disposed between the end 31 of the motor end cover 3 and the insulating bush 4.
In some alternative embodiments, the inner wall of the insulating bush 4 is provided with a ring groove, and the sealing ring 5 is at least partially arranged in the ring groove.
In some alternative embodiments, the outside of the winding 6 is encapsulated with epoxy glue to the housing. It can be understood that although this application has carried out the isolation with cooling liquid and winding 6 through sealing washer 5, sealing washer 5 probably produces wearing and tearing after using for a period of time, leads to having a small amount of cooling liquid to enter into between winding and the casing and motor end cover 3, and for this reason, this application still carries out the encapsulating outside the winding, prevents that the cooling liquid from corroding the winding.
In some alternative embodiments, a second sealing ring 13 is provided between the end cover 3 and the casing of the electric machine.
In this embodiment, the second sealing ring prevents the small amount of coolant entering between the winding and the casing from flowing out of the motor, thereby further improving the reliability of the motor.
In some alternative embodiments, the rotor 1 is provided with retaining rings 7 at both ends.
In some alternative embodiments, a spacer shim 8 is provided between the retaining ring 7 and the rotor 1. In this embodiment, as shown in fig. 1, the outer wall of the end 31 of the end cover 3 is connected to the inner wall of the winding 6 through a seal ring 5, the inner wall of the end 31 of the end cover 3 is connected to the motor shaft through a bearing, a retainer ring 7 is disposed between the bearing and the rotor 1, and the position of the rotor 1 is adjusted through an adjusting gasket 8.
In some optional embodiments, the motor further comprises a shaft cover 9, the shaft cover 9 is disposed at the rear end of the motor shaft 14, the shaft cover 9 is connected to the housing, and a flow passage is formed between the shaft cover 9 and the rear end of the motor shaft 14, the inlet end of the flow passage is communicated with the motor cooling gap, the outlet end of the flow passage is connected to the central shaft hole of the motor shaft 14, and the coolant is guided to the front end of the motor shaft 14 and discharged through the central shaft hole of the motor shaft.
As shown by the arrows in fig. 1, the cooling liquid enters the motor from the gap between the end cover 3 at the front end of the motor and the motor shaft 14, then enters the annular cavity defined by the insulating bush 4 through the bearing, then enters the channel between the stator and the rotor, and continues to flow backwards to the bearing at the rear end of the motor, enters the space defined by the shaft cover 9 and the motor shaft 14 through the bearing, then flows into the central shaft hole of the motor shaft, and flows towards the front end of the motor shaft and is discharged.
In some alternative embodiments, the motor further comprises a printed board 11, the printed board 11 is arranged outside the shaft cover 9 of the motor, the printed board 11 interacts with a position magnetic steel 10 arranged on a motor shaft 14 to generate a position signal, and the printed board 11 is protected by an outer end cover 12 at the rear end of the motor. In an alternative embodiment, printed board 11 also needs to lead out winding lead-out wires to the outside of the motor.
In some alternative embodiments, the printed board 11 and its wiring are protected by epoxy potting inside the outer end cap 12.
The problem of low insulation resistance of the stator winding of the motor in working in the cooling liquid is solved, the cold-state insulation resistance and the hot-state insulation resistance both reach design indexes, the bottleneck problem of the motor in use in the cooling liquid is solved, the heat dissipation of the motor is effectively solved, and the volume and weight of the motor are greatly reduced.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a motor that stator winding and electrically conductive coolant liquid keep apart, includes rotor (1), stator (2) and end cover (3), its characterized in that, the inner wall of winding (6) of stator (1) is provided with insulating bush (4), motor end cover (3) have and stretch into end (31) are stretched into to stator winding inner wall, stretch into end (31) with insulating bush (4) inner wall static seal.
2. An electric machine with stator windings isolated from a conductive cooling fluid according to claim 1, characterized in that a sealing ring (5) is arranged between the end (31) of the end cover (3) of the electric machine and the insulating bush (4).
3. An electrical machine with stator windings isolated from a conductive cooling fluid according to claim 2, characterized in that the insulating bush (4) is provided with an annular groove in its inner wall, in which the sealing ring (5) is at least partially arranged.
4. An electrical machine with stator windings isolated from a conductive coolant as claimed in claim 2, characterised in that the outside of the windings (6) are potted in the casing by means of epoxy glue.
5. An electric machine with stator windings isolated from a conductive cooling fluid according to claim 1, characterized in that a second sealing ring (13) is arranged between the end cover (3) and the machine housing of the electric machine.
6. An electric machine with stator windings isolated from a conductive cooling fluid according to claim 1, characterized in that the rotor (1) is provided with a collar (7) at both ends.
7. An electric machine with stator windings isolated from the conductive cooling liquid according to claim 6, characterized in that a spacer shim (8) is arranged between the collar (7) and the rotor (1).
8. The motor with stator windings isolated from conductive coolant as claimed in claim 1, further comprising a shaft cover (9), wherein the shaft cover (9) is disposed at the rear end of the motor shaft (14), the shaft cover (9) is connected to the housing, and a flow channel is formed between the shaft cover (9) and the rear end of the motor shaft (14), the inlet end of the flow channel is connected to the motor cooling gap, the outlet end of the flow channel is connected to the central axial hole of the motor shaft (14), and the coolant is guided to the front end of the motor shaft (14) and discharged through the central axial hole of the motor shaft.
9. An electric machine with stator windings isolated from conductive coolant according to claim 8, characterized in that the electric machine further comprises a printed board (11), the printed board (11) being arranged outside the shaft cover (9) of the electric machine, the printed board (11) interacting with position magnets (10) arranged on the motor shaft (14) to generate position signals, the printed board (11) being protected by an outer end cover (12) at the rear end of the electric machine.
10. An electrical machine with stator windings isolated from a conductive coolant according to claim 9, characterised in that the printed board (11) and its wiring are protected in the outer end cap (12) by epoxy potting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521640.3A CN114244022A (en) | 2021-12-13 | 2021-12-13 | Motor with stator winding isolated from conductive cooling liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111521640.3A CN114244022A (en) | 2021-12-13 | 2021-12-13 | Motor with stator winding isolated from conductive cooling liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114244022A true CN114244022A (en) | 2022-03-25 |
Family
ID=80755408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111521640.3A Pending CN114244022A (en) | 2021-12-13 | 2021-12-13 | Motor with stator winding isolated from conductive cooling liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114244022A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001218425A (en) * | 2000-02-07 | 2001-08-10 | Thk Co Ltd | Electric motor having rotor cooling function |
| JP2005033995A (en) * | 2003-07-04 | 2005-02-03 | Linde Ag | Electric machine in which internal liquid cooling is performed |
| CN101557143A (en) * | 2008-04-09 | 2009-10-14 | 利勃海尔比伯拉赫有限公司 | Liquid-cooled electric machine and method for cooling such electric machine |
| CN102651579A (en) * | 2011-02-25 | 2012-08-29 | 德昌电机(深圳)有限公司 | Cooling mechanism and motor |
| WO2018233319A1 (en) * | 2017-06-20 | 2018-12-27 | 上海蔚来汽车有限公司 | Liquid-cooling structure for motor rotor |
| CN109194037A (en) * | 2018-10-30 | 2019-01-11 | 清华大学 | A kind of oil-cooled motor can isolate motor stator, rotor place space |
| CN109301962A (en) * | 2018-12-12 | 2019-02-01 | 中车株洲电机有限公司 | A kind of winding overhang encapsulating liquid feeding cool electric machine |
| CN109639054A (en) * | 2018-10-25 | 2019-04-16 | 法法汽车(中国)有限公司 | Motor stator with oil cooled system system |
| CN211579747U (en) * | 2020-04-02 | 2020-09-25 | 山东通用电机有限公司 | Water-cooled motor for metallurgy |
| CN111786524A (en) * | 2020-07-12 | 2020-10-16 | 陕西航空电气有限责任公司 | Oil-cooled intermediate-frequency three-phase asynchronous motor for aviation environment control system |
-
2021
- 2021-12-13 CN CN202111521640.3A patent/CN114244022A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001218425A (en) * | 2000-02-07 | 2001-08-10 | Thk Co Ltd | Electric motor having rotor cooling function |
| JP2005033995A (en) * | 2003-07-04 | 2005-02-03 | Linde Ag | Electric machine in which internal liquid cooling is performed |
| CN101557143A (en) * | 2008-04-09 | 2009-10-14 | 利勃海尔比伯拉赫有限公司 | Liquid-cooled electric machine and method for cooling such electric machine |
| CN102651579A (en) * | 2011-02-25 | 2012-08-29 | 德昌电机(深圳)有限公司 | Cooling mechanism and motor |
| WO2018233319A1 (en) * | 2017-06-20 | 2018-12-27 | 上海蔚来汽车有限公司 | Liquid-cooling structure for motor rotor |
| CN109639054A (en) * | 2018-10-25 | 2019-04-16 | 法法汽车(中国)有限公司 | Motor stator with oil cooled system system |
| CN109194037A (en) * | 2018-10-30 | 2019-01-11 | 清华大学 | A kind of oil-cooled motor can isolate motor stator, rotor place space |
| CN109301962A (en) * | 2018-12-12 | 2019-02-01 | 中车株洲电机有限公司 | A kind of winding overhang encapsulating liquid feeding cool electric machine |
| CN211579747U (en) * | 2020-04-02 | 2020-09-25 | 山东通用电机有限公司 | Water-cooled motor for metallurgy |
| CN111786524A (en) * | 2020-07-12 | 2020-10-16 | 陕西航空电气有限责任公司 | Oil-cooled intermediate-frequency three-phase asynchronous motor for aviation environment control system |
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