Stator assembly and hybrid excitation axial flux switching machine

Abstract

The utility model belongs to motor technical field discloses a kind of stator assembly and mixed excitation axial flux switching motor. Stator assembly includes shell assembly, stator assembly and baffle assembly, baffle assembly includes outer ring baffle and inner ring baffle, outer ring baffle is abutted between outer ring portion and the outer circumferential side of stator core, inner ring baffle is abutted between inner ring portion and the inner circumferential side of stator core, outer ring baffle and inner ring baffle divide into armature winding side and excitation winding side with inner cavity, armature winding side is equipped with first flow channel, first flow channel is communicated with oil inlet and surrounds the periphery of each armature winding, excitation winding side is equipped with second flow channel, second flow channel is communicated with oil outlet and surrounds the periphery of each excitation winding, outer ring baffle or inner ring baffle is equipped with the oil leakage hole of the communication first flow channel and second flow channel. The stator assembly and mixed excitation axial flux switching motor provided by the utility model can improve the heat dissipation efficiency of the stator assembly and ensure the stability of the motor operation.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a stator assembly and a hybrid excitation axial flux switching motor. Background Technology

[0002] Compared to traditional axial flux switching motors, hybrid excitation axial flux switching motors introduce an excitation winding, which de-fixes the magnetic field of the permanent magnet motor, enabling real-time online control of the air gap magnetic field. This significantly improves the motor's speed range, operating efficiency, and output capacity. However, because the magnets, armature windings, excitation windings, and stator core of the hybrid excitation axial flux switching motor are all located on the stator side, the heat dissipation difficulty of the stator assembly is increased. Excessive motor temperature rise can accelerate the aging of winding insulation materials, causing inter-turn or phase-to-phase short circuits, irreversible demagnetization of the magnets, and reduced continuous motor power.

[0003] Therefore, there is an urgent need to provide a stator assembly and a hybrid excitation axial flux switching motor to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a stator assembly and a hybrid excitation axial flux switching motor, which improves the heat dissipation efficiency of the stator assembly and ensures the stability of motor operation.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A stator assembly, comprising:

[0007] The housing assembly includes a housing and a cover plate fastened to the housing. The housing includes an outer ring portion and an inner ring portion. The outer ring portion is arranged around the outer periphery of the inner ring portion and surrounds the inner ring portion to form an inner cavity. An oil inlet and an oil outlet are provided on the outer ring portion.

[0008] A stator assembly is disposed in the inner cavity and sleeved outside the inner ring portion. The stator assembly includes a stator core, in which multiple magnetic steel units are embedded and multiple armature windings and multiple excitation windings are wound. The armature windings and the excitation windings are arranged along the axial direction of the stator core.

[0009] A partition assembly includes an outer ring partition and an inner ring partition. The outer ring partition abuts against the outer ring portion and the outer peripheral side of the stator core, and the inner ring partition abuts against the inner ring portion and the inner peripheral side of the stator core. The outer ring partition and the inner ring partition are both located axially between the armature winding and the excitation winding, and together they divide the inner cavity into an armature winding side and an excitation winding side arranged axially. The armature winding side is provided with a first flow channel, which communicates with the oil inlet and surrounds each of the armature windings. The excitation winding side is provided with a second flow channel, which communicates with the oil outlet and surrounds each of the excitation windings. The outer ring partition or the inner ring partition has an oil leakage hole that connects the first flow channel and the second flow channel.

[0010] As an optional solution, the first flow channel includes a first outer ring flow channel, a first inner ring flow channel, and a plurality of first branch flow channels connecting the first outer ring flow channel and the first inner ring flow channel. The first branch flow channels are located between two adjacent armature windings, the first outer ring flow channel is located between the outer ring portion and the outer peripheral side of the armature winding, and the first inner ring flow channel is located between the inner ring portion and the inner peripheral side of the armature winding.

[0011] As an optional solution, the baffle assembly further includes a plurality of first outer ring baffles and a plurality of first inner ring baffles. The plurality of first outer ring baffles are spaced apart in the first outer ring flow channel, and the plurality of first inner ring baffles are spaced apart in the first inner ring flow channel. Each first outer ring baffle and each first inner ring baffle divides the first flow channel into a plurality of sequentially connected first flow zones. The oil inlet and the oil leakage hole are respectively connected to the first and last two first flow zones.

[0012] As an optional embodiment, the second flow channel includes a second outer ring flow channel, a second inner ring flow channel, and a plurality of second branch flow channels connecting the second outer ring flow channel and the second inner ring flow channel. The second branch flow channels are located between two adjacent excitation windings, the second outer ring flow channel is located between the outer ring portion and the outer peripheral side of the excitation winding, and the second inner ring flow channel is located between the inner ring portion and the inner peripheral side of the excitation winding.

[0013] As an optional solution, the baffle assembly further includes a plurality of second outer ring baffles and a plurality of second inner ring baffles. The plurality of second outer ring baffles are spaced apart in the second outer ring flow channel, and the plurality of second inner ring baffles are spaced apart in the second inner ring flow channel. Each second outer ring baffle and each second inner ring baffle divides the second flow channel into a plurality of sequentially connected second flow zones. The oil leakage hole and the oil outlet are respectively connected to the first and last two second flow zones.

[0014] As an optional solution, each of the magnet units includes multiple segmented units arranged radially at intervals along the stator core. One end of each segmented unit abuts against two adjacent excitation windings, and a first gap flow channel is formed between two adjacent segmented units. A second gap flow channel is formed between the cover plate and the magnet unit, and each of the first gap flow channels is connected between the second gap flow channel and the second branch flow channel.

[0015] As an optional solution, the partition assembly further includes a number of magnetic steel partitions, the number of which is equal to and corresponds one-to-one with the number of magnetic steel units. The number of segmented units in each magnetic steel unit is set to n, where n is an odd number. A magnetic steel partition is provided at the bottom of the middle segmented unit, and the magnetic steel partition is located in the second branch flow channel.

[0016] As an optional embodiment, the stator core includes a circular toroidal core and a plurality of U-shaped cores spaced apart on the circumference of the circular toroidal core. There is a gap between two adjacent U-shaped cores. The excitation winding is wound around the root of each U-shaped core. The magnet unit is embedded in each gap. Each U-shaped core has a toothed groove on the side away from the circular toroidal core. The armature winding is wound between two adjacent toothed grooves.

[0017] As an optional solution, the cover plate has several limiting grooves on the side near the stator assembly, and the end face of each U-shaped iron core is embedded in the corresponding limiting groove, with the cover plate and the magnet unit spaced apart.

[0018] A hybrid excitation axial flux switching motor includes a rotor assembly and the aforementioned stator assembly, wherein the stator assembly and the rotor assembly are arranged axially.

[0019] The beneficial effects of this utility model are:

[0020] This invention discloses a stator assembly and a hybrid excitation axial flux switching motor. During heat dissipation, cooling oil first flows from the oil inlet of the housing into the first flow channel on the armature winding side, circulating around the armature winding and directly cooling it. Then, the cooling oil flows through the oil drain hole into the second flow channel on the excitation winding side, circulating around the excitation winding and directly cooling it. Finally, it flows out from the oil outlet of the housing. Therefore, by adopting the above arrangement, the coolant can flow sequentially from the armature winding side to the excitation winding side, thereby dissipating heat from both the armature and excitation windings respectively, improving the heat dissipation efficiency of the stator assembly and ensuring the stability of motor operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the stator assembly described in an embodiment of the present invention;

[0022] Figure 2 This is an exploded view of the stator assembly described in this embodiment of the present invention;

[0023] Figure 3 This is an axial sectional view of the stator assembly described in this embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the stator core structure according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the cooperation between the stator assembly and the partition assembly according to an embodiment of the present utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the cover plate described in an embodiment of the present utility model;

[0027] Figure 7 This is a schematic diagram of the partition assembly described in an embodiment of the present utility model;

[0028] Figure 8 This is a top view of the armature winding side as described in an embodiment of the present invention;

[0029] Figure 9 This is a cross-sectional view of the excitation winding side as described in an embodiment of the present invention;

[0030] Figure 10 This is a cross-sectional view of the magnet unit described in an embodiment of this utility model.

[0031] In the picture:

[0032] 10. Housing assembly; 11. Housing; 111. Outer ring; 1111. Oil inlet; 1112. Oil outlet; 112. Inner ring; 113. Base plate; 114. Inner cavity; 1141. Armature winding side; 1142. Excitation winding side; 12. Cover plate; 121. Limiting groove;

[0033] 20. Stator assembly; 21. Stator core; 211. Circular core; 212. U-shaped core; 2121. Tooth slot; 2122. Tooth block; 213. Gap slot; 22. Magnet unit; 221. Segmented unit; 222. First gap channel; 223. Second gap channel; 23. Armature winding; 24. Excitation winding;

[0034] 30. Partition assembly; 31. Outer ring partition; 311. Oil leakage hole; 32. Inner ring partition; 33. First outer ring partition; 331. First outer ring partition one; 332. First outer ring partition two; 333. First outer ring partition three; 34. First inner ring partition; 341. First inner ring partition one; 342. First inner ring partition two; 35. Second outer ring partition; 36. Second inner ring partition; 37. Magnet partition;

[0035] 40. First flow channel; 41. First outer ring flow channel; 42. First inner ring flow channel; 43. First branch flow channel;

[0036] 50. Second flow channel; 51. Second outer ring flow channel; 52. Second inner ring flow channel; 53. Second branch flow channel. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] like Figure 1 and Figure 2As shown, this embodiment provides a stator assembly applied in a hybrid excitation axial flux switching motor. Specifically, the stator assembly includes a housing assembly 10 and a stator assembly 20. The stator assembly 20 is disposed inside the housing assembly 10, which is constructed as a ring structure. The entire stator assembly 20 is also constructed as a ring structure, and the stator assembly 20 and the housing assembly 10 are coaxially arranged.

[0042] In this embodiment, the outer casing assembly 10 includes a housing 11 and a cover plate 12. One end of the housing 11 is open, and the cover plate 12 is fastened to the housing 11 to seal the opening. The housing 11 includes a base plate 113, an outer ring portion 111, and an inner ring portion 112. Both the outer ring portion 111 and the inner ring portion 112 are connected to the base plate 113. The outer ring portion 111 surrounds the outer periphery of the inner ring portion 112 and together with the inner ring portion 112 forms an inner cavity 114. This structure of the outer casing assembly 10 facilitates the installation of the stator assembly 20. Optionally, the edge of the cover plate 12 and the edge of the housing 11 can be connected and fixed by multiple bolts or other fasteners.

[0043] like Figure 2 As shown, the stator assembly 20 is disposed in the inner cavity 114 and sleeved outside the inner ring portion 112. Specifically, refer to Figure 4 The stator assembly 20 includes a stator core 21, magnet units 22, armature windings 23, and excitation windings 24. The stator core 21 is embedded with multiple magnet units 22 and wound with multiple armature windings 23 and multiple excitation windings 24. The multiple magnet units 22 are evenly arranged around the circumference of the stator core 21. The multiple armature windings 23 are evenly spaced around the circumference of the stator core 21. The multiple excitation windings 24 are evenly spaced around the circumference of the stator core 21. The armature windings 23 and excitation windings 24 are arranged along the axial direction of the stator core 21. The armature windings 23 are closer to the cover plate 12 than the excitation windings 24.

[0044] Therefore, since the magnet unit 22, armature winding 23, excitation winding 24 and stator core 21 of the hybrid excitation axial flux switching motor are all located on the stator side of the motor, the heat dissipation difficulty of the stator assembly is aggravated. Excessive motor temperature rise will accelerate the aging of winding insulation material, causing short circuits between winding turns or between phases, resulting in irreversible demagnetization of the magnets and reducing the continuous power of the motor.

[0045] To solve the above problems, such as Figure 2 and Figure 3As shown, the stator assembly provided in this embodiment also includes a partition assembly 30. The partition assembly 30 includes an outer ring partition 31 and an inner ring partition 32. Both the outer ring partition 31 and the inner ring partition 32 are annular structures. The outer ring partition 31 abuts against the outer ring portion 111 and the outer peripheral side of the stator core 21, and the inner ring partition 32 abuts against the inner ring portion 112 and the inner peripheral side of the stator core 21. The outer ring partition 31 and the inner ring partition 32 are both located axially between the armature winding 23 and the excitation winding 24, and together they divide the inner cavity 114 into an armature winding side 1141 and an excitation winding side 1142 arranged axially. The outer ring portion 111 is provided with an oil inlet 1111 and an oil outlet 1112. The armature winding side 1141 is provided with a first flow channel 40 (see reference). Figure 8 The first flow channel 40 is connected to the oil inlet 1111 and surrounds each armature winding 23. The excitation winding side 1142 is provided with a second flow channel 50 (see reference). Figure 9 The second flow channel 50 is connected to the oil outlet 1112 and surrounds each excitation winding 24. An oil leakage hole 311 is provided on the outer ring partition 31 or the inner ring partition 32, connecting the first flow channel 40 and the second flow channel 50. The diameter of the oil leakage hole 311 is not less than 3mm, allowing the cooling oil flowing from the first channel on the armature winding side 1141 to flow smoothly into the second flow channel 50 on the excitation winding side 1142 through the oil leakage hole 311.

[0046] During heat dissipation, the cooling oil first flows from the oil inlet 1111 of the housing 11 into the first flow channel 40 of the armature winding side 1141, and flows around the armature winding 23 along the first flow channel 40, thereby directly cooling the armature winding 23. Then, the cooling oil flows through the oil drain hole 311 into the second flow channel 50 of the excitation winding side 1142, and flows around the excitation winding 24 along the second flow channel 50, thereby directly cooling the excitation winding 24. Finally, it flows out from the oil outlet 1112 of the housing 11. Therefore, by adopting the above arrangement, the coolant can flow sequentially from the armature winding side 1141 to the excitation winding side 1142, thereby dissipating heat from the armature winding 23 and the excitation winding 24 respectively, improving the heat dissipation efficiency of the stator assembly and ensuring the stability of motor operation.

[0047] like Figure 4 and Figure 5 As shown, the stator core 21 includes a circular ring core 211 and a plurality of U-shaped cores 212 arranged at intervals in the circumference of the circular ring core 211. There is a gap slot 213 between two adjacent U-shaped cores 212. An excitation winding 24 is wound around the root of each U-shaped core 212. A magnet unit 22 is embedded in each gap slot 213. Each U-shaped core 212 has a toothed groove 2121 on the side away from the circular ring core 211. An armature winding 23 is wound between two adjacent toothed grooves 2121.

[0048] Specifically, continue to refer to Figure 4 and Figure 5 Each excitation winding 24 passes through two adjacent gap slots 213, is wound around the root of the U-shaped iron core 212, and is fixed to the toroidal iron core 211. Multiple excitation windings 24 are arranged circumferentially along the stator iron core 21. That is, two excitation windings 24 pass through each gap slot 213, with a gap between the two excitation windings 24, the gap being no less than 0.5 mm, to allow for coolant flow. Each magnet unit 22 is fixed within the gap slot 213 between two U-shaped iron cores 212, with one end of the magnet unit 22 abutting against the two excitation windings 24 within the gap slot 213, and the other end of the magnet unit 22 being below the surface height of the U-shaped iron core 212. The slots 2121 on the U-shaped iron core 212 divide the U-shaped iron core 212 into two spaced-apart tooth blocks 2122. Each armature winding 23 passes through two adjacent slots 2121 and is wound around two adjacent tooth blocks 2122. These two tooth blocks 2122 belong to two adjacent U-shaped iron cores 212 respectively. In the axial direction, the end face height of the armature winding 23 is lower than the surface height of the U-shaped iron core 212. That is to say, two armature windings 23 pass through each slot 2121, and there is a gap between the two armature windings 23, which is not less than 0.5mm, to allow coolant to flow.

[0049] Optionally, such as Figure 6 As shown, the cover plate 12 has several limiting grooves 121 on the side near the stator assembly 20. The end face of each U-shaped iron core 212 is embedded in the corresponding limiting groove 121. The cover plate 12 and the magnet unit 22 are spaced apart. Specifically, the number of limiting grooves 121 is equal to the number of tooth blocks 2122 and they correspond one-to-one. They are also shaped to fit each tooth block 2122. The end face of each tooth block 2122 can be embedded in the corresponding limiting groove 121 and fixed by adhesive, thereby achieving the function of limiting the stator iron core 21 in the circumferential direction. The depth of the limiting groove 121 is not less than 0.5 mm, and the distance between the cover plate 12 and the magnet unit 22 is not less than 1 mm, so that there is a gap between the cover plate 12 and the magnet unit 22 to form an oil passage.

[0050] like Figure 8 As shown, the first flow channel 40 includes a first outer ring flow channel 41, a first inner ring flow channel 42, and a plurality of first branch flow channels 43 connected between the first outer ring flow channel 41 and the first inner ring flow channel 42. The first branch flow channels 43 are located between two adjacent armature windings 23. The first outer ring flow channel 41 is located between the outer ring portion 111 and the outer peripheral side of the armature winding 23. The first inner ring flow channel 42 is located between the inner ring portion 112 and the inner peripheral side of the armature winding 23.

[0051] Further, refer to Figure 7 and Figure 8The baffle assembly 30 also includes several first outer ring baffles 33 and several first inner ring baffles 34. The several first outer ring baffles 33 are spaced apart in the first outer ring flow channel 41 and erected on the outer ring baffles 31. The several first inner ring baffles 34 are spaced apart in the first inner ring flow channel 42 and erected on the inner ring baffles 32. Each first outer ring baffle 33 and each first inner ring baffle 34 divides the first flow channel 40 into multiple sequentially connected first flow zones. The oil inlet 1111 and the oil leakage hole 311 are respectively connected to the first and last first flow zones. That is, the first first flow zone is connected to the oil inlet 1111 and the last first flow zone is connected to the oil leakage hole 311. The multiple first flow zones are sequentially connected. In this embodiment, the oil leakage hole 311 is provided on the outer ring partition 31, the oil inlet 1111 and the oil leakage hole 311 are arranged adjacent to each other in the circumferential direction, and one of the first outer ring partitions 33 blocks the oil inlet 1111 and the oil leakage hole 311.

[0052] For ease of understanding, this embodiment uses three first outer ring baffles 33 and two first inner ring baffles 34 as examples. The first outer ring baffle 33 closest to the oil inlet 1111 is defined as first outer ring baffle one 331. Along the flow direction of the coolant, the other two first outer ring baffles 33 are respectively called first outer ring baffle two 332 and first outer ring baffle three 333. Similarly, if one of the first inner ring baffles 34 and the first outer ring baffle one 331 are located on the same radius, this first inner ring baffle 34 is defined as first inner ring baffle one 341, and the other first inner ring baffle 34 is defined as first inner ring baffle two 342.

[0053] refer to Figure 8As indicated by the arrow, after the cooling oil flows into the armature winding side 1141 from the oil inlet 1111 of the housing 11, it is blocked by the first outer ring partition 331. One path flows through the first branch channel 43 between the armature windings 23 to the first inner ring channel 42, and is blocked by the first inner ring partition 341, causing the cooling oil to flow unidirectionally within the first inner ring channel 42, cooling the radially inner side and circumferential sides of the armature winding 23. The other path flows unidirectionally within the first outer ring channel 41 on the radially outer side of the armature winding 23, cooling the radially outer side of the armature winding 23. Then, after being blocked by the second outer ring partition 332, the cooling oil in the first inner ring channel 42 is divided into two paths. One path continues to flow unidirectionally within the first inner ring channel 42, while the other path... The cooling oil flows through the first branch channel 43 between the armature windings 23 to the first outer ring channel 41. Then, under the obstruction of the second inner ring partition 342, the cooling oil in the first outer ring channel 41 is divided into two paths. One path continues to flow unidirectionally within the first outer ring channel 41, and the other path flows through the first branch channel 43 between the armature windings 23 to the first inner ring channel 42. Then, under the obstruction of the third outer ring partition 333, the cooling oil in the first inner ring channel 42 is divided into two paths. One path continues to flow unidirectionally within the first inner ring channel 42, and the other path flows through the first branch channel 43 between the armature windings 23 to the first outer ring channel 41. Finally, the cooling oil flows to the excitation winding side 1142 at the oil leakage hole 311 of the outer ring partition 31.

[0054] Therefore, by setting the above-mentioned three first outer ring partitions 33 and two first inner ring partitions 34, the first flow channel 40 on the armature winding side 1141 can be divided into four sequentially connected first flow regions, and a roughly S-shaped single-loop flow path is formed between each first flow region. Figure 8 (As shown by the arrow in the image), thus ensuring that the coolant can flow along the planned flow path. When the coolant flows in the first flow channel 40, it can fully exchange heat with the radial inner side, radial outer side, circumferential sides of the armature winding 23 and the U-shaped iron core 212, ensuring that each position of the armature winding 23 can be cooled evenly, which not only improves the heat dissipation effect, but also ensures the uniformity of the temperature on the armature winding side 1141.

[0055] It should be noted that the number of the first outer ring partition 33 and the first inner ring partition 34 mentioned above is merely an example and is not intended to limit the quantity. Of course, in other optional embodiments, the number of the first outer ring partition 33 and the first inner ring partition 34 can be set to other quantities, as long as the first flow channel 40 on the armature winding side 1141 can be divided into multiple sequentially connected flow regions. No specific limitation is made here.

[0056] Furthermore, such as Figure 9As shown, the second flow channel 50 includes a second outer ring flow channel 51, a second inner ring flow channel 52, and a plurality of second branch flow channels 53 connected between the second outer ring flow channel 51 and the second inner ring flow channel 52. The second branch flow channels 53 are located between two adjacent excitation windings 24. The second outer ring flow channel 51 is located between the outer ring portion 111 and the outer peripheral side of the excitation winding 24, and the second inner ring flow channel 52 is located between the inner ring portion 112 and the inner peripheral side of the excitation winding 24.

[0057] refer to Figure 7 and Figure 9 The baffle assembly 30 also includes several second outer ring baffles 35 and several second inner ring baffles 36. The several second outer ring baffles 35 are spaced apart in the second outer ring flow channel 51 and erected on the outer ring baffles 31. The several second inner ring baffles 36 are spaced apart in the second inner ring flow channel 52 and erected on the inner ring baffles 32. Each second outer ring baffle 35 and each second inner ring baffle 36 divides the second flow channel 50 into multiple sequentially connected second flow zones. The oil leakage hole 311 and the oil outlet 1112 are respectively connected to the first and last second flow zones. That is, the first second flow zone is connected to the oil leakage hole 311, and the last second flow zone is connected to the oil outlet 1112. The multiple second flow zones are sequentially connected.

[0058] In this embodiment, as Figure 7 As shown, the following description uses three second outer ring baffles 35 and two second inner ring baffles 36 as examples. The three second outer ring baffles 35 correspond one-to-one with the three first outer ring baffles 33 and are located on the upper and lower sides of the outer ring baffles 31, respectively. The two second inner ring baffles 36 are slightly offset from the two first inner ring baffles 34 and are located on the upper and lower sides of the inner ring baffles 32, respectively. The flow path of the cooling oil in the second flow channel 50 is basically the same as the flow path of the cooling oil in the first flow channel 40.

[0059] refer to Figure 9 As indicated by the arrow, after the cooling oil flows into the excitation winding side 1142 from the oil leakage hole 311 of the outer ring partition 31, it is blocked by the second outer ring partition 35. The cooling oil is divided into two paths. One path flows through the second branch flow channel 53 between the excitation winding 24 to the second inner ring flow channel 52. Under the obstruction of the second inner ring partition 36, the cooling oil flows unidirectionally in the second inner ring flow channel 52, cooling the radial inner side and circumferential sides of the excitation winding 24. The other path flows unidirectionally in the second outer ring flow channel 51 on the radial outer side of the excitation winding 24, cooling the radial outer side of the excitation winding 24. Then, after being blocked by other second outer ring partitions 35 and second inner ring partitions 36, the cooling oil forms a roughly S-shaped single circulation flow path between the second flow areas, which is basically the same as the flow path of the cooling oil in the first flow channel 40. It will not be described again here. Finally, the cooling oil flows out through the oil outlet 1112 on the housing 11.

[0060] Therefore, by setting the above-mentioned three second outer ring partitions 35 and two second inner ring partitions 36, the second flow channel 50 on the excitation winding side 1142 can be divided into four sequentially connected second flow regions, and a roughly S-shaped single-loop flow path is formed between each second flow region. Figure 9 (As shown by the arrow in the image), thus ensuring that the coolant can flow along the planned flow path. When the coolant flows in the second flow channel 50, it can fully exchange heat with the radial inner side, radial outer side, circumferential sides of the excitation winding 24 and the annular iron core 211, ensuring that each position of the excitation winding 24 can be cooled evenly, which not only improves the heat dissipation effect, but also ensures the temperature uniformity of the excitation winding side 1142.

[0061] It should be noted that the number of the second outer ring partition 35 and the second inner ring partition 36 mentioned above is merely an example and is not intended to limit the quantity. Of course, in other optional embodiments, the number of the second outer ring partition 35 and the second inner ring partition 36 can be set to other quantities, as long as the second flow channel 50 on the armature winding side 1141 can be divided into multiple sequentially connected flow regions. No specific limitation is made here.

[0062] like Figure 5 As shown, the first outer ring partition 33 and the second outer ring partition 35 are respectively in close contact with the outer ring surface of the stator core 21, thereby preventing coolant from flowing through the gaps between the first outer ring partition 33 and the stator core 21, and the gaps between the second outer ring partition 35 and the stator core 21, ensuring that the coolant flows strictly along the planned path. Similarly, the first inner ring partition 34 and the second inner ring partition 36 are respectively in close contact with the inner ring surface of the stator core 21, thereby preventing coolant from flowing through the gaps between the first inner ring partition 34 and the stator core 21, and the gaps between the second inner ring partition 36 and the stator core 21, ensuring that the coolant flows strictly along the planned path.

[0063] Optionally, such as Figure 5 As shown, the first outer ring partition 33 and the first inner ring partition 34 are respectively sleeved on the armature winding 23, and the second outer ring partition 35 and the second inner ring partition 36 are respectively sleeved on the excitation winding 24. This arrangement ensures that the first outer ring partition 33 and the second outer ring partition 35 are in close contact with the outer ring surface of the stator core 21, and the first inner ring partition 34 and the second inner ring partition 36 are in close contact with the inner ring surface of the stator core 21, thereby ensuring that the coolant flows strictly along the planned path.

[0064] In this embodiment, as Figure 5As shown, each magnet unit 22 includes multiple segmented units 221 arranged radially at intervals along the stator core 21, with one end of each segmented unit 221 abutting against two adjacent excitation windings 24. In this embodiment, by dividing each magnet unit 22 into multiple segmented units 221 arranged radially in sequence, the circumferential eddy current path can be effectively blocked, reducing eddy current losses. Furthermore, the spacing between the multiple segmented units 221 increases the heat dissipation area of ​​the segmented units 221, which is beneficial for heat dissipation.

[0065] like Figure 10 As shown, a first gap channel 222 is formed between two adjacent segment units 221, and the width of the first gap channel 222 is not less than 1 mm. A second gap channel 223 is formed between the cover plate 12 and the magnet unit 22. Each first gap channel 222 is connected between the second gap channel 223 and the second branch channel 53. On the excitation winding side 1142, the cooling oil entering each second branch channel 53 can cool each segment unit 221 through the first gap channel 222 and the second gap channel 223.

[0066] refer to Figure 7 and Figure 10 The baffle assembly 30 also includes several magnetic steel baffles 37. The number of magnetic steel baffles 37 is equal to the number of magnetic steel units 22 and corresponds one-to-one. The number of segmented units 221 in each magnetic steel unit 22 is set to n, where n is an odd number. A magnetic steel baffle 37 is provided at the bottom of the segmented unit 221 located in the middle, and the magnetic steel baffle 37 is located in the second branch flow channel 53. The magnetic steel baffle 37 divides the multiple segmented units 221 into an oil inlet side and an oil outlet side, and the number of branches flowing into the magnetic steel unit 22 is equal to the number of branches flowing out of the magnetic steel unit 22.

[0067] refer to Figure 10 On the excitation winding side 1142, the cooling oil entering each of the second branch channels 53, blocked by the magnet partition 37, first flows into the first gap channel 222 between the segmented units 221 on the oil inlet side, then flows through the second gap channel 223 between the cover plate 12 and the magnet unit 22, and then flows out from the first gap channel 222 between the segmented units 221 on the oil outlet side, thereby cooling each segmented unit 221. After that, the cooling oil continues to flow along the second branch channel 53 to the second inner ring channel 52 or the second outer ring channel 51 according to the preset path.

[0068] Therefore, by setting the aforementioned magnetic steel partition 37, a roughly S-shaped single-loop flow path can be formed between each segment unit 221. Figure 10As indicated by the arrows (in the diagram), this ensures that each segment unit 221 receives uniform cooling, improving heat dissipation and guaranteeing the temperature uniformity of the magnet unit 22. Furthermore, by setting the aforementioned partition assembly 30, direct oil cooling is achieved for the stator core 21, each armature winding 23, each excitation winding 24, and each segment unit 221 in the stator assembly. This improves the heat dissipation efficiency and uniformity of the stator assembly, ensuring the stability of motor operation.

[0069] It should be noted that in this embodiment, the number of magnet units 22 is set to 12, and each magnet unit 22 includes 5 segmented units 221 arranged radially at intervals. In other embodiments, the specific number of magnet units 22 and segmented units 221 within each magnet unit 22 can be adjusted according to actual needs, and this embodiment does not impose specific limitations.

[0070] This embodiment also provides a hybrid excitation axial flux switching motor, including a rotor assembly and a stator assembly, which are arranged axially. The stator assembly can be any of the stator assemblies described above, and all such assemblies have the aforementioned effects. The hybrid excitation axial flux switching motor having the aforementioned stator assembly also has the aforementioned effects, so it will not be described again here. It should be noted that the specific structure of the rotor assembly is prior art and will not be described again here.

[0071] It should be noted that the hybrid excitation axial flux switching motor provided in this embodiment can be applied to electrical equipment. Optionally, the electrical equipment can be a vehicle, which can be a pure electric vehicle or a hybrid vehicle; this application does not impose any limitations. The hybrid excitation axial flux switching motor can serve as a motor in a vehicle, used to output power to drive the wheels, for example, as a hub motor. The hybrid excitation axial flux switching motor can also serve as a generator in a vehicle, generating electricity during vehicle operation to charge the vehicle's battery. Of course, in other optional embodiments, the electrical equipment may be other devices, which are not specifically limited here.

[0072] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stator assembly, characterized in that, include: The outer casing assembly (10) includes a housing (11) and a cover plate (12) fastened to the housing (11). The housing (11) includes an outer ring portion (111) and an inner ring portion (112). The outer ring portion (111) is arranged around the outer periphery of the inner ring portion (112) and surrounds the inner ring portion (112) to form an inner cavity (114). The outer ring portion (111) is provided with an oil inlet (1111) and an oil outlet (1112). A stator assembly (20) is disposed in the inner cavity (114) and sleeved outside the inner ring (112). The stator assembly (20) includes a stator core (21). The stator core (21) is embedded with a plurality of magnet units (22) and is wound with a plurality of armature windings (23) and a plurality of excitation windings (24). The armature windings (23) and the excitation windings (24) are arranged along the axial direction of the stator core (21). The partition assembly (30) includes an outer ring partition (31) and an inner ring partition (32). The outer ring partition (31) abuts against the outer ring portion (111) and the outer peripheral side of the stator core (21), and the inner ring partition (32) abuts against the inner ring portion (112) and the inner peripheral side of the stator core (21). The outer ring partition (31) and the inner ring partition (32) are both located axially between the armature winding (23) and the excitation winding (24), and together they divide the inner cavity (114) into an axially arranged armature winding side (1141) and an excitation winding side. On the armature winding side (1142), the armature winding side (1141) is provided with a first flow channel (40), the first flow channel (40) is connected to the oil inlet (1111) and surrounds the armature winding (23), the excitation winding side (1142) is provided with a second flow channel (50), the second flow channel (50) is connected to the oil outlet (1112) and surrounds the excitation winding (24), and an oil leakage hole (311) connecting the first flow channel (40) and the second flow channel (50) is opened on the outer ring partition (31) or the inner ring partition (32).

2. The stator assembly according to claim 1, characterized in that, The first flow channel (40) includes a first outer ring flow channel (41), a first inner ring flow channel (42), and a plurality of first branch flow channels (43) connected between the first outer ring flow channel (41) and the first inner ring flow channel (42). The first branch flow channels (43) are located between two adjacent armature windings (23). The first outer ring flow channel (41) is located between the outer ring portion (111) and the outer peripheral side of the armature winding (23). The first inner ring flow channel (42) is located between the inner ring portion (112) and the inner peripheral side of the armature winding (23).

3. The stator assembly according to claim 2, characterized in that, The baffle assembly (30) further includes a plurality of first outer ring baffles (33) and a plurality of first inner ring baffles (34). The plurality of first outer ring baffles (33) are spaced apart in the first outer ring flow channel (41), and the plurality of first inner ring baffles (34) are spaced apart in the first inner ring flow channel (42). Each first outer ring baffle (33) and each first inner ring baffle (34) divides the first flow channel (40) into a plurality of sequentially connected first flow zones. The oil inlet (1111) and the oil leakage hole (311) are respectively connected to the first and last two first flow zones.

4. The stator assembly according to claim 1, characterized in that, The second flow channel (50) includes a second outer ring flow channel (51), a second inner ring flow channel (52), and a plurality of second branch flow channels (53) connecting the second outer ring flow channel (51) and the second inner ring flow channel (52). The second branch flow channels (53) are located between two adjacent excitation windings (24). The second outer ring flow channel (51) is located between the outer ring portion (111) and the outer peripheral side of the excitation winding (24). The second inner ring flow channel (52) is located between the inner ring portion (112) and the inner peripheral side of the excitation winding (24).

5. The stator assembly according to claim 4, characterized in that, The baffle assembly (30) further includes a plurality of second outer ring baffles (35) and a plurality of second inner ring baffles (36). The plurality of second outer ring baffles (35) are spaced apart in the second outer ring flow channel (51), and the plurality of second inner ring baffles (36) are spaced apart in the second inner ring flow channel (52). Each second outer ring baffle (35) and each second inner ring baffle (36) divides the second flow channel (50) into a plurality of sequentially connected second flow zones. The oil leakage hole (311) and the oil outlet (1112) are respectively connected to the first and last two second flow zones.

6. The stator assembly according to claim 4, characterized in that, Each of the magnet units (22) includes a plurality of segmented units (221) arranged radially at intervals along the stator core (21). One end of each segmented unit (221) abuts against two adjacent excitation windings (24). A first gap flow channel (222) is formed between two adjacent segmented units (221). A second gap flow channel (223) is formed between the cover plate (12) and the magnet unit (22). Each of the first gap flow channels (222) is connected between the second gap flow channel (223) and the second branch flow channel (53).

7. The stator assembly according to claim 6, characterized in that, The partition assembly (30) further includes a number of magnetic steel partitions (37). The number of magnetic steel partitions (37) is equal to the number of magnetic steel units (22) and corresponds one-to-one. The number of segmented units (221) in each magnetic steel unit (22) is set to n, where n is an odd number. A magnetic steel partition (37) is provided at the bottom of the segmented unit (221) located in the middle, and the magnetic steel partition (37) is located in the second branch flow channel (53).

8. The stator assembly according to claim 1, characterized in that, The stator core (21) includes a circular core (211) and a plurality of U-shaped cores (212) arranged at intervals around the circumference of the circular core (211). There is a gap groove (213) between two adjacent U-shaped cores (212). The excitation winding (24) is wound around the root of each U-shaped core (212). The magnet unit (22) is embedded in each gap groove (213). Each U-shaped core (212) has a toothed groove (2121) on the side away from the circular core (211). The armature winding (23) is wound between two adjacent toothed grooves (2121).

9. The stator assembly according to claim 8, characterized in that, The cover plate (12) has several limiting grooves (121) on the side near the stator assembly (20). The end face of each U-shaped iron core (212) is embedded in the corresponding limiting groove (121). The cover plate (12) and the magnet unit (22) are spaced apart.

10. A hybrid excitation axial flux switching motor, characterized in that, It includes a rotor assembly and a stator assembly as described in any one of claims 1-9, wherein the stator assembly and the rotor assembly are arranged axially.

Images