CN117040193A - High-power submersible permanent magnet motor cooled by multiple media - Google Patents
High-power submersible permanent magnet motor cooled by multiple media Download PDFInfo
- Publication number
- CN117040193A CN117040193A CN202311023582.0A CN202311023582A CN117040193A CN 117040193 A CN117040193 A CN 117040193A CN 202311023582 A CN202311023582 A CN 202311023582A CN 117040193 A CN117040193 A CN 117040193A
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- rotor
- cooling
- motor
- stator
- 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
- 238000001816 cooling Methods 0.000 claims abstract description 62
- 238000009423 ventilation Methods 0.000 claims abstract description 8
- 230000017525 heat dissipation Effects 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
-
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
Abstract
The invention relates to a high-power submersible permanent magnet motor cooled by adopting multiple media.A shell is provided with an air inlet and an air outlet on the same side wall surface and is respectively positioned in machine cavities at the two end parts of the motor in the axial direction; the outer surface of the shell is directly contacted with an external water area to dissipate heat, and the stator iron core is clung to the inner wall surface of the shell to realize full heat dissipation by solid heat conduction; an air gap is reserved between the stator core and the rotor; permanent magnets are stuck on the surface of the rotor core; an axial ventilation structure is arranged in the middle area of the rotor; the outside of the permanent magnet is wrapped by the sheath, and hollow structures are reserved on the two sides of the circumference of the permanent magnet and the sheath. According to the motor cooling structure, cooling air can directly circulate through the stator notch and the rotor area, so that the stator tooth part, the permanent magnet and the rotor core are fully cooled, cooling oil in the backpack can efficiently transfer heat corresponding to the stator shell area to the outer surface of the backpack, cooling of the stator is realized through cooling water outside the shell, the heat dissipation efficiency of the motor is greatly improved, and the power density of the motor is effectively improved.
Description
Technical Field
The invention relates to the technical field of motor cooling, in particular to a high-power submersible motor cooled by multiple media.
Background
For the submersible motor with smaller power and lower power density, the motor can be effectively radiated by cooling water on the surface of the casing; for a high-power submersible motor, an internal forced air cooling mode exists; the backpack connected with the conventional submersible motor fixing device is solid. Therefore, it is necessary to design a high-power submersible permanent magnet motor cooled by multiple media, so that the weight of the motor is reduced and the heat of the motor stator winding is efficiently transferred to the outside; cooling air is introduced into the motor from an air inlet on the wall surface of the machine shell, and the cooling air can sufficiently cool the rotor through an air gap and a rotor ventilating duct; the heat generated by the high-power submersible permanent magnet motor can be effectively taken away through cooling of cooling water, cooling air and cooling oil multi-medium, and the power density of the motor is greatly improved.
Disclosure of Invention
The invention aims to provide a high-power submersible permanent magnet motor adopting multi-medium cooling, which can efficiently transfer heat of a motor stator winding to the outside while reducing the weight of the motor by filling cooling oil in a submersible motor knapsack; cooling air is introduced into the motor from an air inlet on the wall surface of the machine shell, and the cooling air can sufficiently cool the rotor through an air gap and a rotor ventilating duct; the heat generated by the high-power submersible permanent magnet motor can be effectively taken away through cooling of cooling water, cooling air and cooling oil multi-medium, and the power density of the motor is greatly improved.
In order to achieve the above purpose, the technical scheme of the invention is as follows: a high power submersible permanent magnet motor employing multi-media cooling, comprising: the motor comprises a rotating shaft, a rotor, a stator and a shell which are coaxially arranged from inside to outside, wherein an air inlet and an air outlet are formed in the same side wall surface of the shell, and the shell is respectively positioned in end machine cavities at two sides of the motor in the axial direction; the outer surface of the shell is directly contacted with an external water area to dissipate heat, and the stator iron core is clung to the inner wall surface of the shell to realize full heat dissipation by solid heat conduction; an air gap is reserved between the stator core and the rotor; permanent magnets are stuck on the surface of the rotor core; an axial ventilation structure is arranged in the middle area of the rotor; the outside of the permanent magnet is wrapped by the sheath, and hollow structures are reserved on the two sides of the circumference of the permanent magnet and the sheath and used for cooling the permanent magnet by air cooling.
Further, a knapsack structure is arranged on the air inlet and outlet side of the shell and is used for fixing the motor, and cooling oil is filled in the shell.
Further, an annular ventilating duct is formed in the middle of the rotor core, the ventilating section of the end part of the rotor is in a fan shape, and the end parts of the two sides of the sub-core are supported by spokes.
Further, permanent magnets on the surface of the rotor core are axially laminated, and a plurality of stages are uniformly distributed along the axial direction.
Further, the number of the jackets outside the permanent magnets is the same as that of the permanent magnets, and axial lamination is performed in the same manner.
Further, a slot is arranged on the axial center line of the inner circumferential surface of the sheath, and forms a mortise-tenon structure with the groove on the surface of the rotor, and the mortise-tenon structure is used for fixing the relative circumferential position of the permanent magnet on the rotor.
Further, the surface of the rotor core is provided with axial grooves which are uniformly distributed on the outer circumferential surface of the rotor core, and the number of the grooves is the same as that of the permanent magnet poles.
Further, a circumferential annular ventilating duct is formed in the middle of the rotor, and spokes are used for supporting two ends of the rotor.
Further, the rotating shaft is a hollow shaft.
Further, when the motor works normally, cooling air enters from the air inlet, high-speed cooling air flows vertically and flows to the opposite sides of the air inlet along the two sides of the rotating shaft, directly flows through the end winding, forms a high-pressure flow field in a machine cavity at the side of the air inlet, is driven by fluid pressure, flows to the air outlet side from the air inlet side through an air gap and a rotor ventilating duct, and achieves full cooling of the stator winding and the rotor area; on the air outlet side, the cooling air is collected towards the air outlet under the action of pressure.
The beneficial effects of the invention are as follows:
according to the invention, through the design of the motor cooling structure, cooling air can directly circulate through the stator notch and the rotor area, so that the stator tooth part, the permanent magnet and the rotor core are fully cooled, cooling oil in the backpack can efficiently transfer heat corresponding to the stator shell area to the outer surface of the backpack, cooling of the stator is realized through cooling water outside the shell, the heat dissipation efficiency of the motor is greatly improved, and the power density of the motor is effectively improved.
Drawings
FIG. 1 is a general diagram of a high power submersible permanent magnet motor of the present invention;
FIG. 2 is a axial cross-sectional view of a high power submersible permanent magnet motor of the present invention;
FIG. 3 is a radial cross-sectional view of the high power submersible permanent magnet motor of the present invention;
FIG. 4 is an internal wind path diagram of the high power submersible permanent magnet motor of the present invention;
fig. 5 is a diagram of the rotor structure of the high-power submersible permanent magnet motor of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1 to 5, a high-power submersible permanent magnet motor using multi-medium cooling in the present embodiment mainly comprises a casing 4, a stator core 5, a permanent magnet 7, a rotor core 11 and a rotating shaft 13.
The same side wall surface of the shell 4 is provided with an air inlet 1 and an air outlet 2 which are respectively positioned in end machine cavities at two sides of the motor axial direction; the outer surface of the shell 4 is directly contacted with an external water area to dissipate heat, and the stator core 5 is tightly attached to the inner wall surface of the shell 4, so that the solid heat conduction and sufficient heat dissipation are realized; the permanent magnet 7 is attached to the surface of the rotor core 11; an axial ventilation structure is arranged in the middle area of the rotor.
One side of the air inlet and outlet of the casing 4 is provided with a knapsack structure 3 for fixing the motor, preferably, the knapsack structure 3 is filled with cooling oil in the embodiment, so that the rapid dissipation of heat corresponding to the stator area is realized.
The outer wall surface of the shell 4 is immersed in water, so that the heat dissipation effect is good, the stator iron core 5 is tightly attached to the inner wall surface of the shell 4, and the solid heat conduction is used for efficiently cooling.
The stator windings are wound in stator slots 6. As a preferred embodiment, in this example, a double layer winding is used in the stator slot 6.
An annular ventilation channel is formed in the middle of the rotor core 11, and the ends of the two sides of the rotor core 11 are supported by spokes. An air gap is reserved between the stator core 5 and the permanent magnet 7. Cooling air flows through the air gap in the axial direction, the rotor annular air channel and the gap between the permanent magnet sheaths.
The outside of the permanent magnet 7 is wrapped by a sheath 8, a slot is arranged on the axial center line of the inner circumferential surface of the sheath 8, and a mortise-tenon structure is formed by the slot and a rotor surface groove 16 and is used for fixing the relative circumferential position of the permanent magnet on the rotor.
Each pole of the permanent magnet 7 is connected by a connecting piece 14, and two sides of the connecting piece 14 are respectively connected with the two-pole permanent magnet 7. The connecting pieces 14 are uniformly distributed with connecting holes 15 along the axial direction, and the number of the connecting holes is consistent with that of the lamination of the permanent magnets in the embodiment. The surface of the rotor core 11 is provided with corresponding connecting holes 17 corresponding to the right lower part of the holes of the connecting pieces, and the connecting pieces 14 are fixed.
Hollow structures are reserved on two sides of the circumference of the permanent magnet 7 and the circumference of the sheath 8 and are used for cooling the permanent magnet by air cooling.
The middle part of the rotating shaft 13 is hollow, and two ends of the rotating shaft 13 are connected with the end face of the rotor core 11 through connecting holes 18.
Alternatively, in the present embodiment, both side ends of the rotor core 11 are supported by 8 sets of spokes, respectively, and the ventilation section of the rotor end is fan-shaped. The cooling air can smoothly circulate from the inside of the rotor to sufficiently cool the rotor region. Compared with a solid rotor, the effective ventilation area is larger, the wind resistance is effectively reduced, and the external air supply cost is reduced.
The working principle of the embodiment in practical application is as follows:
the air inlet 1 and the air outlet 2 are distributed at two ends of the shell. The air outlet of the external cooling device is communicated with the motor air inlet 1, and the air inlet of the external cooling device is communicated with the motor air outlet 2. After cooling air enters from the air inlet 1, high-speed cooling air flow vertically poured flows to the opposite sides of the air inlet along two sides of the rotating shaft, directly flows through the end winding, forms a high-pressure flow field in a machine cavity at the side of the air inlet, is driven by fluid pressure, and flows to the side of the air outlet along the axial direction from the side of the air inlet. The flow area in the axial direction of the cooling medium is: an air gap between the stator core 5 and the permanent magnets 7, an annular air passage in the rotor core 11, and a gap between the permanent magnets 7 and the sheath 8. On the air outlet side, the cooling air is collected towards the air outlet under the action of pressure. The entire air cooling system achieves adequate cooling of the stator inner surface and rotor area.
The heat of the stator is directly contacted with the shell 4 through the stator iron core 5 and is transferred to the outer surface of the shell in a heat conduction mode, and is cooled through cooling water; in particular, for the heat at the shell of the backpack, the heat is transferred to the outer surface of the backpack through cooling oil, and then the heat is cooled through cooling water.
Claims (10)
1. A high power submersible permanent magnet motor employing multi-media cooling, comprising: the rotating shaft, the rotor, the stator and the casing are coaxially arranged from inside to outside, and the rotating shaft, the rotor, the stator and the casing are characterized in that: the same side wall surface of the shell is provided with an air inlet and an air outlet which are respectively positioned in end machine cavities at two sides of the motor in the axial direction; the outer surface of the shell is directly contacted with an external water area to dissipate heat, and the stator iron core is clung to the inner wall surface of the shell to realize full heat dissipation by solid heat conduction; an air gap is reserved between the stator core and the rotor; permanent magnets are stuck on the surface of the rotor core; an axial ventilation structure is arranged in the middle area of the rotor; the outside of the permanent magnet is wrapped by the sheath, and hollow structures are reserved on the two sides of the circumference of the permanent magnet and the sheath and used for cooling the permanent magnet by air cooling.
2. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the casing air inlet and outlet side is provided with a knapsack structure for fixing the motor, and the inside is filled with cooling oil.
3. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: an annular ventilating duct is formed in the middle of the rotor core, the ventilating section of the rotor end is fan-shaped, and the end parts of two sides of the sub-core are supported by spokes.
4. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the permanent magnets on the surface of the rotor core are axially laminated, and a plurality of stages are uniformly distributed along the axial direction.
5. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the number of the jackets outside the permanent magnets is the same as that of the permanent magnets, and the axial lamination is carried out in the same way.
6. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the slot is arranged on the axial center line of the inner circumferential surface of the sheath, and forms a mortise-tenon structure with the groove on the surface of the rotor, and the mortise-tenon structure is used for fixing the relative circumferential position of the permanent magnet on the rotor.
7. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the surface of the rotor core is provided with axial grooves which are uniformly distributed on the outer circumferential surface of the rotor core, and the number of the grooves is the same as that of the permanent magnet poles.
8. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: a circumferential annular ventilating duct is arranged in the middle of the rotor, and two ends of the rotor are supported by spokes.
9. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: the rotating shaft is a hollow shaft.
10. The high power submersible permanent magnet motor with multi-media cooling according to claim 1, wherein: when the motor works normally, cooling air enters from the air inlet, high-speed cooling air flows vertically and flows to the opposite sides of the air inlet along the two sides of the rotating shaft, directly flows through the end winding, forms a high-pressure flow field in a machine cavity at the side of the air inlet, is driven by fluid pressure, flows to the air outlet side from the air inlet side through an air gap and a rotor ventilation channel, and achieves full cooling of the stator winding and the rotor area; on the air outlet side, the cooling air is collected towards the air outlet under the action of pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311023582.0A CN117040193A (en) | 2023-08-14 | 2023-08-14 | High-power submersible permanent magnet motor cooled by multiple media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311023582.0A CN117040193A (en) | 2023-08-14 | 2023-08-14 | High-power submersible permanent magnet motor cooled by multiple media |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117040193A true CN117040193A (en) | 2023-11-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311023582.0A Pending CN117040193A (en) | 2023-08-14 | 2023-08-14 | High-power submersible permanent magnet motor cooled by multiple media |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117040193A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117411244A (en) * | 2023-12-14 | 2024-01-16 | 沈阳众创高科节能电机技术有限公司 | Sectional multi-stage cooling water-filled permanent magnet submersible motor |
-
2023
- 2023-08-14 CN CN202311023582.0A patent/CN117040193A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117411244A (en) * | 2023-12-14 | 2024-01-16 | 沈阳众创高科节能电机技术有限公司 | Sectional multi-stage cooling water-filled permanent magnet submersible motor |
| CN117411244B (en) * | 2023-12-14 | 2024-02-20 | 沈阳众创高科节能电机技术有限公司 | Sectional multi-stage cooling water-filled permanent magnet submersible motor |
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