Stator assembly and oil-cooled motor
By designing circumferentially arranged oil injection channels and oil guide ring structures in the oil-cooled motor, the problem of poor heat dissipation caused by high cooling oil flow resistance is solved, achieving uniform flow of cooling oil and efficient heat dissipation.
Patent Information
- Application Number
- CN202520005026.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-02
AI Technical Summary
The high flow resistance of the cooling oil in existing oil-cooled motors results in poor heat dissipation.
The design incorporates a first and a second oil injection channel arranged alternately along the circumference of the core assembly. The cooling oil gradually approaches the inner circumferential wall from the oil inlet side, forming an inclined straight path. Combined with the oil guide ring structure, the cooling oil flows evenly to different positions of the core assembly for heat dissipation.
The reduced flow resistance of the cooling oil improves heat dissipation, allowing the cooling oil to flow evenly to the core assembly and windings, thus enhancing the motor's heat dissipation efficiency.
Smart Images
Figure CN223680829U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor cooling technical field especially is a kind of stator assembly and oil-cooled motor. BACKGROUND
[0002] With the development of new energy vehicles, the motor power of electric vehicles is continuously improved, and the heat dissipation problem of the motor is more and more prominent. The heat generating components in the motor include the stator core and the winding, and the cooling oil is usually used to dissipate heat for the stator core and the winding in the prior art.
[0003] The existing oil-cooled motor usually designs an oil channel on the stator core, so that the cooling oil can enter the inside of the stator core from both sides of the stator core, and then be sprayed on the winding on the opposite side of the stator core, to ensure the heat dissipation effect of the motor by the double-side oil supply mode.
[0004] However, the structure of the oil channel on the existing stator core is relatively complex, and the flow resistance of the cooling oil in the oil channel is relatively large, thereby resulting in poor heat dissipation effect of the motor. SUMMARY
[0005] To improve the problem of poor heat dissipation effect of the motor caused by large flow resistance of the cooling oil, the utility model provides a stator assembly and an oil-cooled motor.
[0006] According to the embodiments of the utility model, a stator assembly is provided in the first aspect, comprising:
[0007] A core group in the shape of a hollow column with a circular cross-section;
[0008] An oil injection channel comprising a first oil injection channel and a second oil injection channel arranged alternately along the circumference of the core group, the first oil injection channel and the second oil injection channel penetrating through both end faces of the core group to form an oil inlet and an oil outlet on the corresponding end face; the oil inlet of the first oil injection channel and the oil inlet of the second oil injection channel are located on different end faces of the core group.
[0009] The first oil injection channel and the second oil injection channel gradually approach the inner circumferential wall of the core group from the oil inlet side to the oil outlet side.
[0010] In some embodiments, the core group comprises annular cores stacked along the axial direction, the core ring is provided with a first oil injection hole and a second oil injection hole, the first oil injection channel is formed by splicing the first oil injection hole, and the first oil injection channel forms a first oil inlet on the first end face of the core group; the second oil injection channel is formed by splicing the second oil injection hole, and the second oil injection channel forms a second oil inlet on the second end face of the core group.
[0011] The first oil injection holes of the iron core are radially and evenly staggered towards the inner circumferential wall of the iron core from the first end face to the second end face of the iron core group, and the second oil injection holes of the iron core are radially and evenly staggered towards the outer circumferential wall of the iron core.
[0012] In some embodiments, each of the first oil injection channels and each of the second oil injection channels on the iron core group are arranged alternately.
[0013] In some embodiments, each of the first oil injection channels and each of the second oil injection channels on the iron core group are arranged alternately, and the number of each of the first oil injection channels and each of the second oil injection channels is the same and at least two.
[0014] In some embodiments, an even number of first oil injection channels and second oil injection channels are arranged on the iron core group, the central angle of each of the first oil injection channels and the second oil injection channels is α, and the central angle of each slot is β, wherein the ratio of α to β is an integer.
[0015] In some embodiments, the central axes of the first oil injection holes and the second oil injection holes are parallel to the central axis of the iron core.
[0016] In some embodiments, both end faces of the iron core group are provided with oil guide rings, the oil guide rings include recessed portions and convex portions, the recessed portions are arranged corresponding to the oil inlets of the first oil injection channels and the oil inlets of the second oil injection channels, so that the oil inlets are located on the outer side of the oil guide rings, and the convex portions are arranged corresponding to the oil inlets of the first oil injection channels and the oil outlets of the second oil injection channels, so that the oil outlets are located on the inner side of the oil guide rings.
[0017] The oil guide ring is provided with an oil injection through hole corresponding to the two end portions of the winding.
[0018] According to the embodiments of the utility model, the second aspect provides an oil-cooled motor, including a shell, a rotor assembly and the aforementioned stator assembly, the stator assembly is fixedly arranged on the inner side of the shell, the rotor assembly is rotatably arranged on the inner side of the stator assembly, and the rotating shaft is fixedly arranged on the inner side of the rotor assembly.
[0019] In some embodiments, the shell is provided with an oil supply channel, and the oil supply channel is communicated to the oil inlets of the first oil injection channels and the second oil injection channels.
[0020] In the stator assembly of the utility model, since the first oil injection channel and the second oil injection channel gradually approach the inner peripheral wall of the core group from the oil inlet side to the oil outlet side, the first oil injection channel and the second oil injection channel are approximately in the shape of an inclined straight line, the cooling oil can gradually approach the inner side of the core group under the guidance of the first oil injection channel and the second oil injection channel, the flow resistance of the cooling oil is small and gradually approaches the heating part; the adjacent first oil injection channel and second oil injection channel form an "X" shaped path on the axial cross section, the cooling oil can uniformly flow to different positions of the core group for heat dissipation, which can effectively improve the heat dissipation effect of the motor. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 It is a structure schematic view of the inside of the oil-cooled motor of the embodiment;
[0022] Figure 2 It is a structure schematic view of the core group;
[0023] Figure 3 It is a structure schematic view of the core;
[0024] Figure 4 It is an assembly structure schematic view of the oil guide ring;
[0025] Figure 5 It is a structure schematic view of the oil guide ring.
[0026] In the drawing: the shell 10; the oil supply channel 11; the core group 20; the core 21; the first oil injection hole 22; the second oil injection hole 23; the first oil injection channel 30; the first oil inlet 31; the first oil outlet 32; the second oil injection channel 40; the second oil inlet 41; the second oil outlet 42; the winding 50; the wire slot 51; the oil guide ring 60; the recess 61; the convex part 62; the oil injection through hole 63; the recess 64. DETAILED DESCRIPTION
[0027] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.
[0028] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the limiting conditions of the implementation of the utility model. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effect and purpose that can be produced by the utility model, should still fall within the scope of the technical content disclosed by the utility model.
[0029] The orientation or positional relationship indicated in the specification such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility new type. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0030] As shown in Figure 1 , the embodiment provides an oil-cooled motor, which comprises a shell 10, a stator assembly and a rotor assembly (not shown in the figure). The inside of the shell 10 forms a cavity, the stator assembly is fixedly arranged in the cavity, and the rotor assembly is rotatably arranged on the inner side of the stator assembly.
[0031] The stator assembly of the embodiment specifically comprises a core group 20 and a winding 50. The core group 20 comprises cores 21 stacked along the axial direction, each core 21 being a circular ring, so that the core group 20 is a hollow column with a circular cross section. The core group 20 is provided with wire slots 51, the slot openings of the wire slots 51 being located on the inner peripheral wall of the core group 20, the wire slots 51 penetrating through the two end faces of the core group 20 along the axial direction of the core group 20, the wires in the winding 50 being embedded in the wire slots 51, and the two end portions of the winding 50 extending out of the two end faces of the core group 20. It should be noted that the connection mode of the core group 20 and the winding 50 is a prior art, and the embodiment will not be described in detail.
[0032] Specifically referring to Figure 2 , the core group 20 of the embodiment is provided with an oil injection channel, which is in communication with the oil supply channel 11. The oil injection channel penetrates through the core group 20 along the axial direction to correspondingly form an oil inlet and an oil outlet on the two end faces of the core group 20. The shell 10 of the embodiment is provided with an oil supply channel 11, which is used to supply cooling liquid oil to the oil inlet of the oil injection channel. The structure of the oil supply channel 11 is a prior art, and the embodiment will not be described in detail.
[0033] The oil injection channel of the embodiment specifically comprises a first oil injection channel 30 and a second oil injection channel 40 arranged alternately along the circumferential direction of the core group 20. The oil inlet of the first oil injection channel 30 and the oil inlet of the second oil injection channel 40 are located on different end faces of the core group 20, and the first oil injection channel 30 and the second oil injection channel 40 both gradually converge towards the inner peripheral wall of the core group 20 from the oil inlet side to the oil outlet side.
[0034] Specifically, the first oil inlet 31 of the first oil injection channel 30 is located at the first end face of the iron core group 20, and the first oil outlet 32 of the first oil injection channel 30 is located at the second end face of the iron core group 20; the second oil inlet 41 of the second oil injection channel 40 is located at the second end face of the iron core group 20, and the second oil outlet 42 of the second oil injection channel 40 is located at the first end face of the iron core group 20. The cooling oil can not only enter the interior of the iron core group 20 from the first oil inlet 31 of the first end face of the iron core group 20, then exchange heat with the interior of the iron core group 20 through the first oil injection channel 30, and finally exit the interior of the iron core group 20 from the first oil outlet 32 of the second end face of the iron core group 20; the cooling oil can also enter the interior of the iron core group 20 from the second oil inlet 41 of the second end face of the iron core group 20, then exchange heat with the interior of the iron core group 20 through the second oil injection channel 40, and finally exit the interior of the iron core group 20 from the second oil outlet 42 of the first end face of the iron core group 20. The double-side oil supply mode can make the heat dissipation of the iron core group 20 uniform and ensure the heat dissipation effect of the motor.
[0035] The first oil injection channel 30 of the embodiment gradually approaches the inner circumferential wall of the iron core group 20 from the side of the first oil inlet 31 to the side of the first oil outlet 32, and the second oil injection channel 40 gradually approaches the inner circumferential wall of the iron core group 20 from the side of the second oil inlet 41 to the side of the second oil outlet 42. The separate first oil injection channel 30 and second oil injection channel 40 are substantially in the shape of an inclined straight line, and the cooling oil can gradually approach the inner side of the iron core group 20 under the guidance of the first oil injection channel 30 and the second oil injection channel 40, and the flow resistance of the cooling oil is small and gradually approaches the heating part; the adjacent first oil injection channel 30 and second oil injection channel 40 form an “X”-shaped path in the axial cross section, and the cooling oil can uniformly flow to different positions of the iron core group 20 for heat dissipation, which can further improve the heat dissipation effect of the iron core group 20.
[0036] Specifically, Figure 3 The thickness and number of the iron cores 21 of the embodiment can be set according to actual needs. Each iron core 21 is annularly provided with the first oil injection hole 22 and the second oil injection hole 23 penetrating through the two end faces thereof. The first oil injection channel 30 is formed by splicing the first oil injection holes 22 on the iron cores 21, and the second oil injection channel 40 is formed by splicing the second oil injection holes 23 on the iron cores 21. In the direction from the first end face to the second end face of the iron core group 20, the first oil injection holes 22 of the iron cores 21 are uniformly staggered in sequence along the radial direction towards the inner circumferential wall of the iron cores 21, and the second oil injection holes 23 of the iron cores 21 are uniformly staggered in sequence along the radial direction towards the outer circumferential wall of the iron cores 21.
[0037] The central axes of the first oil injection holes 22 and the second oil injection holes 23 of the embodiment are preferably parallel to the central axis of the iron core 21, so as to facilitate machining of the oil injection holes on the iron core 21. In some embodiments, the central axes of the first oil injection holes 22 and the second oil injection holes 23 can be selected to be inclined at an angle relative to the central axis of the iron core 21, and the oil outlet sides of the first oil injection holes 22 and the second oil injection holes 23 are closer to the inner circumferential wall of the iron core 21 than the oil inlet sides, and the first oil injection holes 22 and the second oil injection holes 23 on the plurality of iron cores 21 are aligned end to end, so that the central axes of the first oil injection channels 30 and the second oil injection channels 40 are oblique lines.
[0038] From the direction of the first end surface to the second end surface of the iron core group 20, a part of the first oil injection hole 22 of the first iron core 21 abuts against the end surface of the second iron core 21, and another part communicates with the first oil injection hole 22 of the second iron core 21, the part of the first oil injection hole 22 abutting against the end surface is close to the outer circumferential wall of the iron core 21, and the part of the first oil injection hole 22 communicating with each other is close to the inner circumferential wall of the iron core 21. The second oil injection hole 23 is arranged in the same way, and the embodiment will not be described here. The staggered arrangement of the first oil injection hole 22 and the second oil injection hole 23 not only enables the first oil injection channel 30 and the second oil injection channel 40 to be substantially oblique straight lines, but also increases the contact area of the cooling oil with the iron core 21, thereby improving the heat dissipation effect of the iron core group 20.
[0039] The first oil injection channel 30 and the second oil injection channel 40 of the embodiment can be arranged alternately in one first oil injection channel 30 and one second oil injection channel 40, or in one group of first oil injection channels 30 and one group of second oil injection channels 40, and the number of each group of first oil injection channels 30 and each group of second oil injection channels 40 is the same and at least two, so as to facilitate machining of the first oil injection channel 30 and the second oil injection channel 40 arranged alternately on the iron core 21. As shown in the iron core 21, Figure 3 the number of each group of first oil injection channels 30 and each group of second oil injection channels 40 of the embodiment is 3.
[0040] The iron core group 20 of the embodiment preferably has m groups of first oil injection channels 30 and second oil injection channels 40, and the number of wire grooves 51 is n, wherein m is preferably an even number, and the ratio of the central angle a of each group of first oil injection channels 30 and second oil injection channels 40 to the central angle b of each wire groove 51 is an integer, that is, and the ratio of the central angle a of each group of first oil injection channels 30 and second oil injection channels 40 to the central angle b of each wire groove 51 is an integer, so as to align the first oil injection channel 30 and the second oil injection channel 40 with the wire groove 51.
[0041] The first oil injection channel 30 and the second oil injection channel of the present embodiment have their oil outlets extending towards the portions of the winding 50 that protrude from the two end faces of the core set 20, so that the cooling oil flows through the core set 20 and is directly sprayed onto the winding 50. Specifically, the first oil outlet 32 of the first oil injection channel 30 extends towards the winding 50 outside the second end face of the core set 20, and the second oil outlet 42 of the second oil injection channel 40 extends towards the winding 50 outside the first end face of the core set 20. The cooling oil can not only flow through the inside of the core set 20 through the oil injection channels, but also be sprayed onto the two end portions of the winding 50, so that the cooling oil can fully exchange heat with the components in the stator assembly, thereby ensuring the heat dissipation effect of the stator assembly.
[0042] Specifically referring to Figure 4 , the stator assembly of the present embodiment further comprises a guide oil ring 60 arranged correspondingly on the two end faces of the core set 20. The guide oil ring 60 comprises a recess 61 corresponding to the oil inlet and a protrusion 62 corresponding to the oil outlet, so that the oil inlet is located outside the guide oil ring 60 and the oil outlet is located inside the guide oil ring 60.
[0043] Specifically referring to Figure 5 , the recess 61 of the guide oil ring 60 is provided with an oil injection hole 63, which extends towards the corresponding two end portions of the winding 50, so that the cooling oil can flow through the oil injection hole 63 to the portions of the winding 50 that protrude from the two end faces of the core set 20, further improving the heat dissipation effect of the stator assembly. The end faces of the two ends of the guide oil ring 60 can also be provided with a groove 64, which is used to embed a sealing ring to ensure the airtightness between the two ends of the guide oil ring 60 and the inner wall of the shell 10 and the end face of the core set 20, respectively, to prevent oil leakage from the connection.
[0044] Specifically, as Figure 4 shown, the stator assembly comprises a first guide oil ring arranged on the first end face of the core set 20 and a second guide oil ring arranged on the second end face of the core set 20. The first guide oil ring comprises a first recess and a first protrusion. The first recess corresponds to the first oil inlet 31 of the first oil injection channel 30, so that the first oil inlet 31 of the first oil injection channel 30 is located outside the first guide oil ring, and is used to guide the cooling oil into the first oil injection channel 30. The first protrusion corresponds to the second oil outlet 42 of the second oil injection channel 40, so that the second oil outlet 42 of the second oil injection channel 40 is located inside the first guide oil ring, to guide the cooling oil to be sprayed onto the winding 50. The second guide oil ring comprises a second recess and a second protrusion. The second recess corresponds to the second oil inlet 41 of the second oil injection channel 40, so that the second oil inlet 41 of the second oil injection channel 40 is located outside the second guide oil ring, and is used to guide the cooling oil into the second oil injection channel 40. The second protrusion corresponds to the first oil outlet 32 of the first oil injection channel 30, so that the first oil outlet 32 of the first oil injection channel 30 is located inside the second guide oil ring, to guide the cooling oil to be sprayed onto the winding 50.
[0045] Any combination of the technical features in the above embodiments can be made, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradiction, it should be considered as the scope of the description.
[0046] The above embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the application patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.
Claims
1. A stator assembly characterized by, The application relates to an iron core group (20) in a hollow columnar shape with a circular cross section. The oil injection channel comprises first oil injection channels (30) and second oil injection channels (40) arranged alternately along the circumference of the iron core group (20), the first oil injection channels (30) and the second oil injection channels (40) penetrating through the two end faces of the iron core group (20) to form oil inlets and outlets on the corresponding end faces; the oil inlets of the first oil injection channels (30) and the oil inlets of the second oil injection channels (40) are located on different end faces of the iron core group (20). The first oil injection channels (30) and the second oil injection channels (40) gradually approach the inner circumferential wall of the iron core group (20) from the oil inlet side to the oil outlet side. The iron core group (20) comprises annular iron cores (21) stacked along the axial direction, the iron cores (21) are provided with first oil injection holes (22) and second oil injection holes (23), the first oil injection channels (30) are formed by splicing the first oil injection holes (22), and the first oil injection channels (30) form first oil inlets (31) on the first end face of the iron core group (20); the second oil injection channels (40) are formed by splicing the second oil injection holes (23), and the second oil injection channels (40) form second oil inlets (41) on the second end face of the iron core group (20).
2. The stator assembly of claim 1, wherein: In the direction from the first end face to the second end face of the iron core group (20), the first oil injection holes (22) of the iron cores (21) are uniformly staggered in the radial direction towards the inner circumferential wall of the iron core (21) in sequence, and the second oil injection holes (23) of the iron cores (21) are uniformly staggered in the radial direction towards the outer circumferential wall of the iron core (21) in sequence. Each of the first oil injection channels (30) and each of the second oil injection channels (40) on the iron core group (20) are arranged alternately.
3. A stator assembly according to claim 1 or 2, characterised in that: Each of the first oil injection channels (30) and each of the second oil injection channels (40) on the iron core group (20) are arranged alternately, the number of each of the first oil injection channels (30) and each of the second oil injection channels (40) is the same and is at least two.
4. A stator assembly according to claim 1 or 2, characterised in that: Wire slots (51) are formed on the iron core group (20), the wire slots (51) penetrate through the two end faces of the iron core group (20) in the axial direction, windings (50) are arranged in the wire slots (51), and the two end portions of the windings (50) protrude from the two end faces of the iron core group (20).
5. The stator assembly of claim 4, wherein: The oil outlets of the first oil injection channels (30) and the oil outlets of the second oil injection channels (40) respectively face the two end portions of the windings (50). The iron core group (20) is provided with an even number of first oil injection channels (30) and second oil injection channels (40), the central angle of each of the first oil injection channels (30) and the second oil injection channels (40) is alpha, the central angle of each wire slot (51) is beta, and the ratio of alpha to beta is an integer.
6. The stator assembly of claim 5, wherein: The central axes of the first oil injection holes (22) and the second oil injection holes (23) are parallel to the central axis of the iron core (21).
7. The stator assembly of claim 2, wherein: 8. The stator assembly of claim 5, wherein: Both end faces of the iron core group (20) are provided with oil guide rings (60), the oil guide rings (60) comprise recesses (61) and protrusions (62), the recesses (61) are arranged corresponding to the oil inlets of the first oil injection channels (30) and the second oil injection channels (40), so that the oil inlets are located on the outer side of the oil guide rings (60); the protrusions (62) are arranged corresponding to the oil outlets of the first oil injection channels (30) and the second oil injection channels (40), so that the oil outlets are located on the inner side of the oil guide rings (60); The recesses (61) of the oil guide rings (60) are provided with oil injection through holes (63) corresponding to the two end portions of the windings (50).
9. An oil-cooled electric machine characterized by: The motor comprises a shell (10), a rotor assembly and the stator assembly of any one of claims 1-8, the stator assembly is fixedly arranged on the inner side of the shell (10), and the rotor assembly is rotatably arranged on the inner side of the stator assembly.
10. The oil-cooled electric machine of claim 9, wherein: An oil supply channel (11) is arranged on the shell (10), and the oil supply channel (11) is communicated with the oil inlets of the first oil injection channels (30) and the second oil injection channels (40).