CN112003403A - Hybrid cooling outer rotor permanent magnet motor - Google Patents
Hybrid cooling outer rotor permanent magnet motor Download PDFInfo
- Publication number
- CN112003403A CN112003403A CN202010475855.5A CN202010475855A CN112003403A CN 112003403 A CN112003403 A CN 112003403A CN 202010475855 A CN202010475855 A CN 202010475855A CN 112003403 A CN112003403 A CN 112003403A
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- China
- Prior art keywords
- stator
- cooling
- outer rotor
- winding
- iron core
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- 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.)
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Classifications
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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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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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
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators
-
- 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
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses a hybrid cooling outer rotor permanent magnet motor, and relates to the field of motors. Most of the existing outer rotor permanent magnet motors adopt single air cooling or liquid cooling, and the power density improving capability of the motors is limited. The invention comprises a stator and an outer rotor, wherein the stator comprises a stator support shaft, a stator core and a stator winding, the outer rotor comprises an outer rotor casing, a rotor permanent magnet and an end cover, an air inlet hole of an axial fan is arranged on the end cover, an air outlet hole is arranged at the lower part of the outer rotor casing, and an iron core liquid cooling loop and a winding liquid cooling loop which are respectively used for cooling the stator core and the stator winding are arranged on the stator. The heat generated by the stator armature winding and the stator iron core can be transferred through the iron core liquid cooling loop and the winding liquid cooling loop, an air cooling channel is formed through the end cover air inlet hole, the outer rotor air outlet hole and the air duct inside the motor, and the cooling effect can be effectively improved, the power density of the motor is improved, and the volume weight of the motor is reduced through the mixed cooling mode of the two cooling loops.
Description
Technical Field
The invention relates to the field of motors, in particular to a hybrid cooling outer rotor permanent magnet motor.
Background
At present, most of the existing outer rotor permanent magnet motors adopt single air cooling or liquid cooling, and the power density improving capacity of the motors is limited. In special application environments, it is desirable to reduce the weight of the motor as much as possible to increase power density.
Disclosure of Invention
The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme, and provide a hybrid cooling outer rotor permanent magnet motor, aiming at reducing the weight of the motor and improving the power density. Therefore, the invention adopts the following technical scheme.
A mixed cooling outer rotor permanent magnet motor comprises a stator and an outer rotor positioned outside the stator, wherein the stator comprises a stator support shaft, a stator core arranged on the stator support shaft, and a stator winding arranged on the stator core, the outer rotor comprises an outer rotor casing, a rotor permanent magnet arranged in the outer rotor casing and an end cover arranged at the upper end of the outer rotor casing, the center of the end cover is rotatably connected with the stator support shaft through the rotor hollow shaft, a running clearance is reserved between the periphery of the stator and the inner side of the rotor permanent magnet, air inlet holes of the axial flow fan are uniformly distributed on the end cover in a surrounding way, air outlet holes are uniformly distributed on the lower part of the outer rotor casing in a surrounding way, the air cooling device is characterized in that the air inlet hole, the air outlet hole and the air cooling channel inside the motor form an air cooling loop, and the stator is provided with an iron core liquid cooling loop and a winding liquid cooling loop which are respectively used for cooling a stator iron core and a stator winding. The heat generated by the stator armature winding and the stator iron core can be transferred through the iron core liquid cooling loop and the winding liquid cooling loop, the air cooling loop is formed through the air inlet hole in the end cover, the air outlet hole in the lower part of the outer rotor shell and the air cooling channel in the motor for air cooling heat dissipation, and under the mixed cooling mode of the two cooling loops, the cooling effect can be effectively improved, the power density of the motor is improved, and the volume and the weight of the motor are reduced.
As a preferable technical means: the stator support shaft comprises a vertical inner ring, a vertical outer ring, an annular flat ring arranged on the outer side of the lower end of the vertical outer ring and a connecting ring connected between the vertical inner ring and the vertical outer ring, the rotor hollow shaft and the stator support shaft are rotatably connected through an upper bearing and a lower bearing, the outer rotor casing comprises a casing body and an annular cover plate, the casing body is located on the middle upper portion, the rotor permanent magnet is embedded in the casing body, the annular cover plate is located on the lower end of the casing body, the lower end of the annular cover plate is located on the outer side of the upper end of the annular flat ring, and an operating. The stator support shaft is simple in structure and can be effectively connected with the rotor in a rotatable mode.
As a preferable technical means: the fresh air inlet just to the winding, the clamping ring on be equipped with vertical ventilation hole, the below of clamping ring be equipped with the ring board that keeps out the wind between the lower part of vertical inner circle and vertical outer lane, the vertical outer lane position between clamping ring and the ring board that keeps out the wind encircles the equipartition and runs through the side opening, annular cover plate on encircle the equipartition and have the exhaust vent. After entering the air inlet hole, the air of the axial flow air of the air inlet flows through the inner side and the outer side of the winding, the outer side of the axial flow air of the air inlet passes through the gap between the winding and the stator and the rotor from the downward direction, and then the axial flow air of the air inlet flows out from the air outlet hole, the inner side of the axial flow air of the air inlet passes through the vertical air vent from the downward direction, due to the obstruction of the wind shielding annular plate below, the cooling air can only laterally pass through the penetrating side holes to cool the lower end parts of the stator core and the winding and then flows out from the air outlet.
As a preferable technical means: the iron core liquid cooling loop comprises vertical iron core cooling pipelines which are uniformly distributed in a surrounding mode, the vertical iron core cooling pipelines are connected in parallel or in series to form the iron core liquid cooling loop, and cold media are injected into the iron core liquid cooling loop. Effectively realize iron core liquid cooling circuit.
As a preferable technical means: vertical iron core cooling pipe locate in the periphery wall of vertical outer lane, the outside and the iron core inner peripheral wall of vertical iron core cooling pipe paste. Can directly carry out heat exchange to the iron core, and the cooling effect is good.
As a preferable technical means: the winding liquid cooling loop comprises vertical winding cooling pipelines which are uniformly distributed in a surrounding mode, the vertical winding cooling pipelines are connected in parallel or in series to form the winding liquid cooling loop, and a cold medium is injected into the winding liquid cooling loop. And a winding liquid cooling loop is effectively realized.
As a preferable technical means: and each vertical winding cooling pipeline is uniformly distributed between two adjacent stator windings and is attached to the windings on two sides. Can directly carry out heat exchange on the winding, and has good cooling effect.
As a preferable technical means: the iron core liquid cooling loop and the winding liquid cooling loop adopt non-magnetic materials. The electromagnetic structure of the motor itself is not changed.
As a preferable technical means: the rotor permanent magnet is formed by bonding a plurality of small pieces of magnetic steel through insulating glue. The eddy current loss of the magnetic steel can be effectively reduced.
As a preferable technical means: the stator support shaft and the iron core liquid cooling loop are integrally formed through casting or 3D printing. The manufacturing process is simplified, and the weight increased by independently arranging the cooling pipeline can be effectively saved.
As a preferable technical means: the outer rotor casing is matched with the end cover through a spigot. The seam allowance matching mode is universal in use and accurate in positioning.
As a preferable technical means: the stator core is formed by laminating silicon steel sheets or by pressing iron powder. And the cost is low by adopting a conventional manufacturing mode.
Has the advantages that: can transmit the heat that produces by stator armature winding and stator core through iron core liquid cooling circuit and winding liquid cooling circuit, through the forced air cooling return circuit, can effectively cool off rotor permanent magnet, stator core and stator winding, under the mixed cooling mode through these two kinds of cooling circuit, can effectively promote the cooling effect, improve motor power density, reduce motor volume and weight.
Drawings
Fig. 1 is a schematic view of a 3D structure with a radial cross-section according to the present invention.
FIG. 2 is a schematic horizontal cross-sectional view of the present invention.
FIG. 3 is an enlarged view of portion A of FIG. 1 according to the present invention.
FIG. 4 is a schematic view of an air-cooled circuit according to the present invention.
In the figure: 1-a stator support shaft; 2-a stator core; 3-a stator winding; 4-outer rotor casing; 5-rotor permanent magnets; 6-end cover; 7-rotor hollow shaft; 8-core liquid cooling circuit; 9-winding liquid cooling circuit; 10-wind deflector ring plate; 11-an upper bearing; 12-a lower bearing; 101-a vertical outer ring; 102-vertical inner ring; 103-a connecting ring; 104-annular flat ring; 105-a vent; 106-penetrating the side hole; 401-air outlet; 402-a housing body; 403-annular shroud plate; 601-air inlet holes.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
As shown in fig. 1-4, a hybrid cooling outer rotor permanent magnet motor comprises a stator and an outer rotor located outside the stator, the stator comprises a stator support shaft 1, a stator core 2 disposed on the stator support shaft 1, and a stator winding 3 disposed on the stator core 2, the outer rotor comprises an outer rotor housing 4, the rotor permanent magnet cooling device comprises a rotor permanent magnet 5 arranged in an outer rotor case 4 and an end cover 6 arranged at the upper end of the outer rotor case 4, wherein the center of the end cover 6 is rotatably connected with a stator support shaft 1 through a rotor hollow shaft 7, an operation gap is reserved between the periphery of a stator and the inner side of the rotor permanent magnet 5, axial fan air inlet holes 601 are uniformly distributed on the end cover 6 in a surrounding manner, air outlet holes 401 are uniformly distributed on the lower portion of the outer rotor case 4 in a surrounding manner, the air inlet holes 601, the air outlet holes 401 and an air cooling channel inside a motor form an air cooling loop, and an iron core liquid cooling loop 8 and a winding liquid cooling loop 9 which are respectively used.
In order to realize the rotatable connection with the rotor, the stator support shaft 1 comprises a vertical inner ring 102, a vertical outer ring 101, an annular flat ring 104 arranged on the outer side of the lower end of the vertical outer ring 101, and a connecting ring 103 connected between the vertical inner ring 102 and the vertical outer ring 101, the hollow rotor shaft 7 and the stator support shaft 1 are rotatably connected through an upper bearing 11 and a lower bearing 12, the outer rotor casing 4 comprises a casing body 402 which is positioned on the middle upper part and is embedded with a rotor permanent magnet 5, and an annular cover plate 403 arranged on the lower end of the casing body 402, the lower end of the annular cover plate 403 is positioned on the outer side of the upper end of the annular flat ring 104, and an operating. The stator support shaft 1 is simple in structure and can be effectively connected with the rotor in a rotatable mode.
In order to realize better air cooling effect, the air inlet holes 601 are opposite to the winding, the connecting ring 103 is provided with vertical air vents 105, a wind shielding annular plate 10 is arranged below the connecting ring 103 and between the lower parts of the vertical inner ring 102 and the vertical outer ring 101, penetrating side holes 106 are uniformly distributed around the part of the vertical outer ring 101 between the connecting ring 103 and the wind shielding annular plate 10, and air outlet holes 401 are uniformly distributed on the annular cover plate 403. After entering the air inlet hole 601, the air of the axial flow air of the inlet air flows through the inner side and the outer side of the winding, the outer side of the axial flow air downwards penetrates through the gap between the winding and the stator and the rotor and then flows out of the air outlet hole 401, the inner side of the axial flow air downwards penetrates through the vertical air vent 105, due to the blocking of the lower wind shielding annular plate 10, the cooling air only can laterally penetrate through the penetrating side hole 106 to cool the lower end parts of the stator iron core 2 and the winding and then flows out of the air outlet hole 401, a complete air cooling loop is formed, the rotor permanent magnet 5, the stator iron core 2 and the stator winding.
In order to realize the iron core liquid cooling loop 8, the iron core liquid cooling loop 8 comprises vertical iron core cooling pipelines which are uniformly distributed in a surrounding manner, the vertical iron core cooling pipelines are connected into the iron core liquid cooling loop 8 in a parallel connection manner, and cold media are injected into the iron core liquid cooling loop 8. The core liquid cooling circuit 8 is effectively realized, and in the example, the core liquid cooling circuit can be replaced in a series connection mode.
In order to better realize the cooling of the iron core, the vertical iron core cooling pipeline is arranged in the outer peripheral wall of the vertical outer ring 101, and the outer side of the vertical iron core cooling pipeline is attached to the inner peripheral wall of the iron core. Can directly carry out the heat exchange to the iron core, the cooling effect is better.
In order to realize the winding liquid cooling circuit 9, the winding liquid cooling circuit 9 comprises vertical winding cooling pipelines which are uniformly distributed in a surrounding manner, the vertical winding cooling pipelines are connected into the winding liquid cooling circuit 9 in a parallel connection mode, and a cold medium is injected into the winding liquid cooling circuit 9. The winding liquid cooling circuit 9 is effectively realized, and in the present example, the series connection mode can be adopted instead.
In order to better realize the cooling of the windings, each vertical winding cooling pipeline is uniformly distributed between two adjacent stator windings 3, and the vertical winding cooling pipelines are attached to the windings on two sides. Can directly carry out the heat exchange to the winding, the cooling effect is better.
In order not to change the electromagnetic structure of the motor itself, the core liquid cooling circuit 8 and the winding liquid cooling circuit 9 use non-magnetic conductive materials. The electromagnetic structure of the motor itself is not changed.
In order to reduce the eddy current loss of the magnetic steel, the rotor permanent magnet 5 is formed by bonding small pieces of magnetic steel through insulating glue. The eddy current loss of the magnetic steel can be effectively reduced.
In order to reduce costs, the stator support shaft 1 and the core liquid cooling circuit 8 are integrally formed by casting. The manufacturing process is simplified, the weight increased by independently arranging the cooling pipeline can be effectively saved, the cost is reduced, and a 3D printing integrated material increase manufacturing mode can be adopted for replacement.
For the convenience of installation, the outer rotor casing 4 is matched with the end cover 6 through a spigot. The spigot matching mode is universal, convenient to install and accurate in positioning.
In this example, the stator core 2 is formed by laminating silicon steel sheets, or iron powder may be used instead of laminating silicon steel sheets.
The heat generated by the stator armature winding and the stator iron core 2 can be transferred through the iron core liquid cooling loop 8 and the winding liquid cooling loop 9, the rotor permanent magnet 5, the stator iron core 2 and the stator winding 3 can be effectively cooled through the air cooling loop consisting of the air inlet 601 on the end cover 6, the air outlet 401 at the lower part of the outer rotor shell 4 and the air cooling channel inside the motor, and the cooling effect can be effectively improved, the power density of the motor is improved, and the volume and the weight of the motor are reduced.
The hybrid cooling outer rotor permanent magnet motor shown in fig. 1-4 is a specific embodiment of the present invention, and has shown the outstanding substantive features and significant progress of the present invention, and it is within the scope of protection of the present solution to modify the same in shape, structure, etc. according to the practical needs.
Claims (10)
1. The utility model provides a hybrid cooling external rotor permanent-magnet machine, includes the stator and is located the external rotor in the stator outside, its characterized in that: the stator comprises a stator support shaft (1), a stator iron core (2) arranged on the stator support shaft (1) and a stator winding (3) arranged on the stator iron core (2), the outer rotor comprises an outer rotor casing (4), a rotor permanent magnet (5) arranged in the outer rotor casing (4) and an end cover (6) arranged at the upper end of the outer rotor casing (4), the center of the end cover (6) is rotatably connected with the stator support shaft (1) through a rotor hollow shaft (7), a running gap is reserved between the periphery of the stator and the inner side of the rotor permanent magnet (5), axial flow fan air inlet holes (601) are uniformly distributed on the end cover (6) in a surrounding manner, air outlet holes (401) are uniformly distributed on the lower part of the outer rotor casing (4) in a surrounding manner, and an air cooling loop is formed by the air inlet holes (601), the air outlet holes (401) and an air, the stator is provided with an iron core liquid cooling loop (8) and a winding liquid cooling loop (9) which are respectively used for cooling the stator iron core (2) and the stator winding (3).
2. The hybrid cooling outer rotor permanent magnet machine of claim 1, wherein: the stator support shaft (1) comprises a vertical inner ring (102), a vertical outer ring (101), an annular flat ring (104) arranged on the outer side of the lower end of the vertical outer ring (101), and a connecting ring (103) connected between the vertical inner ring (102) and the vertical outer ring (101), the rotor hollow shaft (7) and the stator support shaft (1) are rotatably connected through an upper bearing (11) and a lower bearing (12), the outer rotor casing (4) comprises a casing body (402) and an annular cover plate (403), the casing body is located on the middle upper portion of the casing body and is embedded with the rotor permanent magnet (5), the annular cover plate (403) is arranged on the lower end of the casing body (402), the lower end of the annular cover plate (403) is located on the outer side of the upper end of the annular flat ring (104), and an operating gap exists.
3. The hybrid cooling outer rotor permanent magnet machine of claim 2, wherein: the fresh air inlet (601) just to the winding, clamping ring (103) on be equipped with vertical ventilation hole (105), the lower position of clamping ring (103) be equipped with between the lower part of vertical inner circle (102) and vertical outer lane (101) ring board (10) keep out the wind, vertical outer lane (101) position between clamping ring (103) and the ring board (10) that keeps out the wind encircles the equipartition and has run through side opening (106), annular cover plate (403) on encircle the equipartition and have exhaust vent (401).
4. The hybrid cooling outer rotor permanent magnet machine of claim 2, wherein: the iron core liquid cooling loop (8) comprises vertical iron core cooling pipelines which are uniformly distributed in a surrounding mode, the vertical iron core cooling pipelines are connected into the iron core liquid cooling loop (8) in a parallel or serial mode, and cold media are injected into the iron core liquid cooling loop.
5. The hybrid cooling outer rotor permanent magnet machine of claim 4, wherein: vertical iron core cooling tube locate in the periphery wall of vertical outer lane (101), the outside and the iron core inner peripheral wall of vertical iron core cooling tube paste.
6. The hybrid cooling outer rotor permanent magnet machine of claim 2, wherein: the winding liquid cooling loop (9) comprises vertical winding cooling pipelines which are uniformly distributed in a surrounding mode, the vertical winding cooling pipelines are connected in parallel or in series to form the winding liquid cooling loop (9), and cold media are filled in the winding liquid cooling loop.
7. The hybrid cooling outer rotor permanent magnet machine of claim 6, wherein: each vertical winding cooling pipeline is uniformly distributed between two adjacent stator windings (3), and the vertical winding cooling pipelines are attached to the windings on two sides.
8. The hybrid cooling outer rotor permanent magnet machine of claim 1, wherein: the iron core liquid cooling loop (8) and the winding liquid cooling loop (9) adopt non-magnetic-conductive materials.
9. The hybrid cooling outer rotor permanent magnet machine of claim 1, wherein: the rotor permanent magnet (5) is formed by bonding a plurality of small magnetic steels through insulating glue.
10. The hybrid cooling outer rotor permanent magnet machine of claim 1, wherein: stator support axle (1) and iron core liquid cooling circuit (8) through casting integrated into one piece or 3D print integrated into one piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010475855.5A CN112003403A (en) | 2020-05-29 | 2020-05-29 | Hybrid cooling outer rotor permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010475855.5A CN112003403A (en) | 2020-05-29 | 2020-05-29 | Hybrid cooling outer rotor permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112003403A true CN112003403A (en) | 2020-11-27 |
Family
ID=73466601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010475855.5A Pending CN112003403A (en) | 2020-05-29 | 2020-05-29 | Hybrid cooling outer rotor permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112003403A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113556005A (en) * | 2021-07-07 | 2021-10-26 | 杭州电子科技大学 | Motor structure for improving heat dissipation of stator |
| CN114448154A (en) * | 2022-01-14 | 2022-05-06 | 南昌三瑞智能科技有限公司 | Liquid cooling heat dissipation external rotor electric machine and aircraft thereof |
| EP4135170A1 (en) * | 2021-08-09 | 2023-02-15 | ebm-papst Mulfingen GmbH & Co. KG | Electric motor with improved cooling |
| DE102022210697A1 (en) | 2022-10-11 | 2024-04-11 | Robert Bosch Gesellschaft mit beschränkter Haftung | Electronically commutated electric motor with external rotor design and wheel hub drive |
-
2020
- 2020-05-29 CN CN202010475855.5A patent/CN112003403A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113556005A (en) * | 2021-07-07 | 2021-10-26 | 杭州电子科技大学 | Motor structure for improving heat dissipation of stator |
| EP4135170A1 (en) * | 2021-08-09 | 2023-02-15 | ebm-papst Mulfingen GmbH & Co. KG | Electric motor with improved cooling |
| CN114448154A (en) * | 2022-01-14 | 2022-05-06 | 南昌三瑞智能科技有限公司 | Liquid cooling heat dissipation external rotor electric machine and aircraft thereof |
| DE102022210697A1 (en) | 2022-10-11 | 2024-04-11 | Robert Bosch Gesellschaft mit beschränkter Haftung | Electronically commutated electric motor with external rotor design and wheel hub drive |
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