Stator Assembly and Motor

Abstract

The present invention relates to the technical field of motors, and particularly relates to a stator assembly and a motor, including: a stator core, including a stator yoke portion and tooth portions, a tooth slot is formed between two adjacent tooth portions, and a plurality of cooling channels are uniformly distributed along the circumferential direction in the stator yoke portion; a stator winding; a first inflow cavity, having at least one first cooling medium inlet, the first inflow cavity is arranged at the first end of the stator yoke portion and is communicated with each cooling channel; a first outflow cavity, having at least one first cooling medium outlet, the first outflow cavity is arranged at the second end of the stator yoke portion and is communicated with each cooling channel; a second inflow cavity, having at least one second cooling medium inlet, the second inflow cavity is arranged at the first end of the tooth slot and is communicated with each tooth slot; a second outflow cavity, having at least one second cooling medium outlet, the second outflow cavity is arranged at the second end of the tooth slot and is communicated with each tooth slot.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly and a motor. Background Art

[0002] With the rapid development of the high-speed motor industry, the motor field continues to develop towards high speed and miniaturization. As the power and speed of the motor gradually increase, the heat generation during the operation of the motor becomes more and more serious. The main heat sources are the copper loss generated by the copper wire and the iron loss generated by the stator core. The copper loss that has the greatest impact is mainly concentrated on the stator winding. If the stator winding overheats seriously, the insulating paint of the enameled wire will melt or catch fire, exposing the copper wire to the air and causing the stator to short-circuit and burn out. The iron loss generated by the stator core will cause the temperature of the rotor assembly to be too high, resulting in demagnetization of the permanent magnet, which seriously shortens the service life of the motor.

[0003] At present, in addition to self-cooling, the cooling of motors is generally divided into three types:

[0004] Air cooling: Install a fan on the motor rotor, and use the mechanical energy of the motor to drive the impeller to rotate to generate natural wind. Although the effect is better than natural cooling, the efficiency is still very low, and it is not recommended to be used in high-speed and high-power motors; Blow high-pressure cold air directly on the stator and rotor of the motor, and open air holes on the motor housing and stator core to directly take away the heat inside the motor with high-pressure cold air. However, due to the low thermal conductivity of air, this method can only be used for motors with low heat generation, or to assist the above method to cool the motor.

[0005] Water cooling: Open a water channel in the motor housing. The heat generated by the motor is transferred to the housing through the stator core, and then the heat is taken out of the motor by the liquid in the water channel inside the housing. Although water cooling has a better effect than air cooling, it still has some deficiencies. Usually, water cooling and air cooling are used in combination for high-speed motors.

[0006] Oil cooling: The cooling effect is very good, and it can directly cool the motor winding and lubricate the bearing; however, the oil channel design is complex, and the casting or processing difficulty of the housing and end cover is high.

[0007] The prior art discloses a stator cooling structure, including a stator core, which includes a stator yoke and stator teeth. The stator teeth are located on the inner peripheral wall of the stator yoke and are arranged circumferentially. A stator slot is provided between adjacent stator teeth. The stator teeth are wound with a stator winding. It further includes: a cooling pipe, which includes a first side pipe, a second side pipe and an end cooling member. The first side pipe axially penetrates the stator core and is arranged on the outer peripheral side of the stator winding. The second side pipe axially penetrates the stator core and is arranged on the inner peripheral side of the stator winding. The end cooling member is communicated with both the first side pipe and the second side pipe and is located at the end of the stator winding. In this prior art, there is a layer of cooling pipes between the cooling medium and the heat source, which affects the heat conduction efficiency. At the same time, the number of the first side pipes is the same as that of the second side pipes. In fact, the heat generation amounts of the stator winding and the stator core are different. Cooling the winding and the core together will cause uneven cooling of the entire stator. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defect of uneven cooling of the entire stator in the prior art, so as to provide a stator assembly and a motor that can cool the winding and the core separately to uniformly cool the entire stator.

[0009] To solve the above technical problem, a stator assembly provided by the present invention includes: a stator core, including a stator yoke and teeth, and a tooth slot is formed between two adjacent teeth. A plurality of cooling channels extending axially and penetrating the stator yoke are uniformly distributed along the circumferential direction in the stator yoke; a stator winding, including a middle winding arranged in the tooth slot and an outgoing end winding and a non-outgoing end winding located at both ends of the middle winding; a first inflow cavity, having at least one first cooling medium inlet, the first inflow cavity is arranged at the first end of the stator yoke and is communicated with each of the cooling channels; a first outflow cavity, having at least one first cooling medium outlet, the first outflow cavity is arranged at the second end of the stator yoke and is communicated with each of the cooling channels; a second inflow cavity, having at least one second cooling medium inlet, the second inflow cavity is arranged at the first end of the tooth slot and is communicated with each of the tooth slots; a second outflow cavity, having at least one second cooling medium outlet, the second outflow cavity is arranged at the second end of the tooth slot and is communicated with each of the tooth slots. One of the outgoing end winding and the non-outgoing end winding is arranged in the second inflow cavity, and the other of the outgoing end winding and the non-outgoing end winding is arranged in the second outflow cavity.

[0010] Optionally, the stator assembly further includes a sealing structure, and the sealing structure seals the notch of the tooth slot.

[0011] Optionally, the first inflow cavity and the second inflow cavity are located at the same end of the stator core, and the first outflow cavity and the second outflow cavity are located at the same end of the stator core.

[0012] Optionally, the first inflow cavity and the second inflow cavity are separated and both formed in the first housing.

[0013] Optionally, the first housing includes a first annular bottom surface, a first outer annular wall formed at the outer edge of the first annular bottom surface, a first inner annular wall formed at the inner edge of the first annular bottom surface, and a first intermediate annular wall located between the first outer annular wall and the first inner annular wall. The first inflow cavity is formed between the first annular bottom surface, the first outer annular wall and the first intermediate annular wall, and the second inflow cavity is formed between the first annular bottom surface, the first inner annular wall and the first intermediate annular wall.

[0014] Optionally, the first cooling medium inlet is located on the first outer annular wall, the second cooling medium inlet is located on the first inner annular wall, the first cooling medium inlet is connected to a first cooling medium inflow pipe, the second cooling medium inlet is connected to a second cooling medium inflow pipe, and the second cooling medium inflow pipe penetrates through the first outer annular wall.

[0015] Optionally, the stator core is connected with a temperature sensor, regulating valves, pressure gauges and / or flow meters are respectively arranged on the first cooling medium inflow pipe and the second cooling medium inflow pipe, the stator assembly further includes a controller, and the controller is respectively in communication connection with the temperature sensor, the regulating valve, the pressure gauge and / or the flow meter.

[0016] Optionally, the first outflow cavity and the second outflow cavity are separated and both formed in the second housing.

[0017] Optionally, the outgoing end winding is arranged in the second outflow cavity. The second housing includes a second annular bottom surface, a second outer annular wall formed at the outer edge of the second annular bottom surface, a second inner annular wall formed at the inner edge of the second annular bottom surface, and a second intermediate annular wall located between the second outer annular wall and the second inner annular wall. The second intermediate annular wall is spaced apart from the second annular bottom surface and connected to the second outer annular wall through a third annular bottom surface. The third annular bottom surface is parallel to the second annular bottom surface. The first outflow cavity is formed between the third annular bottom surface, the second inner annular wall and the second outer annular wall, and the space in the second housing except the first outflow cavity is the second outflow cavity.

[0018] Optionally, both the first cooling medium outlet and the second cooling medium outlet are located on the second outer ring wall. The first cooling medium outlet is connected to a first cooling medium outflow pipe, and the second cooling medium outlet is connected to a second cooling medium outflow pipe.

[0019] Optionally, the sealing structure is formed by a sealant, and the sealing structure is sealingly connected to the first housing, the stator core, and the second housing.

[0020] Optionally, the stator core includes stator laminations and stator baffles provided at both ends of the stator laminations. The stator laminations include a main body portion and a plurality of first slot portions provided inside the main body portion and evenly spaced along the circumferential direction. A plurality of cooling channels are provided in the main body portion, evenly spaced along the circumferential direction and penetrating the main body portion. The stator baffles are provided with through holes corresponding to the cooling channels one by one and second slot portions corresponding to the first slot portions one by one. The through holes and the cooling channels form the cooling flow path, and the first slot portions and the second slot portions form the tooth slots.

[0021] Optionally, the first cooling medium inlet, the second cooling medium inlet, the first cooling medium outlet, and the second cooling medium outlet are all connected to a cooling device.

[0022] The present invention also provides a motor including the stator assembly described above.

[0023] The technical solution of the present invention has the following advantages:

[0024] In the stator assembly provided by the present invention, a part of the cooling medium flows into the first inflow cavity through the first cooling medium inlet, and then enters each cooling flow path to perform heat replacement inside the stator core to cool the inside of the stator core, and then flows into the first outflow cavity and flows out through the first cooling medium outlet; another part of the cooling medium flows into the second inflow cavity through the second cooling medium inlet to cool the outgoing end winding or the non-outgoing end winding, and then flows through each tooth slot to cool the middle winding and the tooth portion, and then flows into the second outflow cavity, cools the non-outgoing end winding or the outgoing end winding and then flows out through the second cooling medium outlet. It can cool the stator core and the stator winding comprehensively and avoid the problem that the overall stator cooling is uneven when cooling the stator core and the stator winding together, and solves the problems of excessive temperature rise of the stator winding of the high-speed motor and difficulty in dissipating the heat inside the stator core. Description of the Drawings

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a cross-sectional view of the stator assembly provided in Embodiment 1 of the present invention at one section;

[0027] Figure 2 It is a cross-sectional view of the stator assembly provided in Embodiment 1 of the present invention at another section;

[0028] Figure 3 It is Figure 1 a cross-sectional view of the stator punching sheet shown;

[0029] Figure 4 It is Figure 1 a structural schematic diagram of the first housing shown;

[0030] Figure 5 It is a cross-sectional view of the first housing at one section;

[0031] Figure 6 It is a cross-sectional view of the first housing at another section;

[0032] Figure 7 It is Figure 1 a structural schematic diagram of the second housing shown;

[0033] Figure 8 It is a cross-sectional view of the second housing at one section;

[0034] Figure 9 It is a cross-sectional view of the second housing at another section.

[0035] Explanation of reference numerals:

[0036] 1. Stator core; 101. Stator punching sheet; 1011. Main body part; 1012. First groove part; 1013. Cooling channel; 102. Stator baffle; 1021. Through hole; 2. Stator winding; 201. Middle winding; 202. Outlet end winding; 203. Non-outlet end winding; 4. First inflow cavity; 401. First cooling medium inlet; 5. First outflow cavity; 501. First cooling medium outlet; 6. Second inflow cavity; 601. Second cooling medium inlet; 7. Second outflow cavity; 701. Second cooling medium outlet; 8. First housing; 801. First annular bottom surface; 802. First outer ring wall; 803. First inner ring wall; 804. First middle ring wall; 9. First cooling medium inflow pipe; 10. Second cooling medium inflow pipe; 11. Second housing; 1101. Second annular bottom surface; 1102. Second outer ring wall; 1103. Second inner ring wall; 1104. Second middle ring wall; 1105. Third annular bottom surface; 12. First cooling medium outflow pipe; 13. Second cooling medium outflow pipe. Detailed implementation mode

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0040] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] Embodiment 1

[0042] The prior art discloses a stator cooling structure, including a stator core, the stator core includes a stator yoke portion and stator tooth portions, the stator tooth portions are located on the inner circumferential wall of the stator yoke portion and are arranged circumferentially; stator slots are provided between adjacent stator teeth; stator windings are wound around the stator tooth portions, and further include: cooling pipes, the cooling pipes include a first side pipe, a second side pipe and an end cooling member, the first side pipe axially penetrates the stator core, and the first side pipe is arranged on the outer circumferential side of the stator windings; the second side pipe axially penetrates the stator core, and the second side pipe is arranged on the inner circumferential side of the stator windings; the end cooling member is communicated with both the first side pipe and the second side pipe, and the end cooling member is located at the end of the stator windings. In this prior art, there is a layer of cooling pipes between the cooling medium and the heat source, which affects the heat conduction efficiency. At the same time, the number of the first side pipes is the same as that of the second side pipes, but in fact, the heat generation amounts of the stator windings and the stator core are different, and cooling the windings and the core together will cause uneven cooling of the entire stator.

[0043] For this reason, this embodiment provides a stator assembly, which can cool the windings and the core respectively so as to evenly cool the entire stator.

[0044] In one embodiment, as Figures 1 to 9 shown, the stator assembly includes a stator core 1, a stator winding 2, a first inflow cavity 4, a first outflow cavity 5, a second inflow cavity 6 and a second outflow cavity 7.

[0045] Among them, the stator core 1 includes a stator yoke portion and tooth portions, tooth slots are formed between two adjacent tooth portions, and a plurality of cooling channels extending axially and penetrating the stator yoke portion are uniformly distributed along the circumferential direction in the stator yoke portion; the stator winding 2 includes a middle winding 201 arranged in the tooth slots and lead-end windings 202 and non-lead-end windings 203 located at both ends of the middle winding 201; the first inflow cavity 4 has at least one first cooling medium inlet 401, the first inflow cavity 4 is arranged at the first end of the stator yoke portion and is communicated with each cooling channel; the first outflow cavity 5 has at least one first cooling medium outlet 501, the first outflow cavity 5 is arranged at the second end of the stator yoke portion and is communicated with each cooling channel; the second inflow cavity 6 has at least one second cooling medium inlet 601, the second inflow cavity 6 is arranged at the first end of the tooth slots and is communicated with each tooth slot; the second outflow cavity 7 has at least one second cooling medium outlet 701, the second outflow cavity 7 is arranged at the second end of the tooth slots and is communicated with each tooth slot, and one of the lead-end winding 202 and the non-lead-end winding 203 is arranged in the second inflow cavity 6, and the other of the lead-end winding 202 and the non-lead-end winding 203 is arranged in the second outflow cavity 7.

[0046] In this embodiment, a part of the cooling medium flows into the first inflow cavity 4 through the first cooling medium inlet 401, then enters each cooling channel to perform heat exchange inside the stator core 1 to cool down the inside of the stator core 1, and then flows into the first outflow cavity 5 and flows out through the first cooling medium outlet 501; another part of the cooling medium flows into the second inflow cavity 6 through the second cooling medium inlet 601 to cool the outgoing end winding 202 or the non-outgoing end winding 203, then flows through each tooth groove to cool the middle winding 201 and the tooth part, and then flows into the second outflow cavity 7. After cooling the non-outgoing end winding 203 or the outgoing end winding 202, it flows out through the second cooling medium outlet 701. It can comprehensively cool the stator core 1 and the stator winding 2, and avoid the problem that the overall stator cooling is uneven when cooling the stator core 1 and the stator winding 2 together, and solves the problems of excessive temperature rise of the stator winding 2 of the high-speed motor and difficulty in dissipating the heat inside the stator core 1.

[0047] Based on the above embodiment, in a preferred embodiment, the stator assembly further includes a sealing structure that seals the notch of the tooth groove. In this embodiment, the cooling medium will not flow out through the tooth groove and contact the rotor. The stator core 1 and the stator winding 2 are both in a fully enclosed cooling environment, which solves the problem of oil loss caused by the common oil cooling method contacting the high-speed rotating rotor.

[0048] Based on the above embodiment, in a preferred embodiment, the first inflow cavity 4 and the second inflow cavity 6 are located at the same end of the stator core 1, and the first outflow cavity 5 and the second outflow cavity 7 are located at the same end of the stator core 1. In this embodiment, by arranging the first inflow cavity 4 and the second inflow cavity 6 at the same end of the stator core 1, and arranging the first outflow cavity 5 and the second outflow cavity 7 at the same end of the stator core 1, it is convenient to connect the first inflow cavity 4 and the second inflow cavity 6 with the cooling device, and recycle the cooling medium flowing out from the first outflow cavity 5 and the second outflow cavity 7 from the same end. Of course, in an alternative embodiment, the first inflow cavity 4 and the second inflow cavity 6 can be located at both ends of the stator core 1 respectively, and correspondingly, the first outflow cavity 5 and the second outflow cavity 7 are also located at both ends of the stator core 1 respectively.

[0049] Based on the above embodiments, in a preferred embodiment, the first inflow cavity 4 and the second inflow cavity 6 are separated and both are formed within the first housing 8. In this embodiment, by simultaneously forming the first inflow cavity 4 and the second inflow cavity 6 within the first housing 8, the structure is simple. After fixing the first housing 8 to one end of the stator core 1, the first inflow cavity 4 can be connected to the cooling channel. The non-outlet end winding 203 or the outlet end winding 202 of the stator winding 2 is located within the second inflow cavity 6. The second inflow cavity 6 can not only limit the stator winding 2, but also the cooling medium flowing into the second inflow cavity 6 can cool down the non-outlet end winding 203 or the outlet end winding 202.

[0050] Specifically, in one embodiment, as Figures 4 to 6 shown, the first housing 8 includes a first annular bottom surface 801, a first outer ring wall 802 formed at the outer edge of the first annular bottom surface 801, a first inner ring wall 803 formed at the inner edge of the first annular bottom surface 801, and a first intermediate ring wall 804 located between the first outer ring wall 802 and the first inner ring wall 803. The first inflow cavity 4 is formed between the first annular bottom surface 801, the first outer ring wall 802, and the first intermediate ring wall 804, and the second inflow cavity 6 is formed between the first annular bottom surface 801, the first inner ring wall 803, and the first intermediate ring wall 804. In other alternative embodiments, the shape of the first housing 8 can be other shapes.

[0051] Figure 1 and Figure 2 shows that the non-outlet end winding 203 is located in the second inflow cavity 6, and the cooling sequence of the stator winding 2 is non-outlet end winding 203 - intermediate winding - outlet end winding 202. In fact, the outlet end winding 202 can also be arranged in the second inflow cavity 6. At this time, the cooling sequence of the stator winding 2 is outlet end winding 202 - intermediate winding - non-outlet end winding 203. When the outlet end winding 202 is arranged in the second inflow cavity 6, an outlet opening needs to be opened on the second inflow cavity 6.

[0052] It should be noted that the diameter of the first intermediate ring wall 804 is less than or equal to the inner diameter of the ring where the cooling channel is located, and greater than the diameter of the circle where the bottom of the tooth groove is located. The diameter of the first inner ring wall 803 is less than or equal to the inner diameter of the stator core 1, and the diameter of the first outer ring wall 802 is greater than or equal to the outer diameter of the ring where the cooling channel is located and less than or equal to the outer diameter of the stator core 1. In a preferred embodiment, the diameter of the first outer ring wall 802 is equal to the outer diameter of the ring where the cooling channel is located, the diameter of the first intermediate ring wall 804 is equal to the inner diameter of the ring where the cooling channel is located, and the diameter of the first inner ring wall 803 is equal to the inner diameter of the stator core 1.

[0053] Based on the above embodiments, in a preferred embodiment, the first cooling medium inlet 401 is located on the first outer ring wall 802, the second cooling medium inlet 601 is located on the first inner ring wall 803, the first cooling medium inlet 401 is connected to a first cooling medium inflow pipe 9, the second cooling medium inlet 601 is connected to a second cooling medium inflow pipe 10, and the second cooling medium inflow pipe 10 penetrates through the first outer ring wall 802. In this embodiment, the cooling medium flows into the first medium inflow cavity and the second medium inflow cavity from the side, which facilitates the connection of the first cooling medium inflow pipe 9 and the second cooling medium inflow pipe 10, and the first cooling medium inflow pipe 9 and the second cooling medium inflow pipe 10 will not interfere with other components of the motor. In an alternative embodiment, the first cooling medium inlet 401 and the second cooling medium inlet 601 can also be respectively arranged on the first annular bottom surface 801. In this embodiment, the second cooling medium inflow pipe 10 does not need to penetrate through the first outer ring wall 802.

[0054] Based on the above embodiments, in a preferred embodiment, the stator core 1 is connected with a temperature sensor, regulating valves, pressure gauges and / or flow meters are respectively arranged on the first cooling medium inflow pipe 9 and the second cooling medium inflow pipe 10, and the stator assembly further includes a controller which is respectively communicatively connected with the temperature sensor, the regulating valve, the pressure gauge and / or the flow meter. In this embodiment, by arranging the temperature sensor, the temperature of the stator core 1 can be detected in real time, and the flow rate and / or pressure of the cooling medium in the first cooling medium inflow pipe 9 and the flow rate and / or pressure of the cooling medium in the second cooling medium inflow pipe 10 can be adjusted according to the temperature detected by the temperature sensor, so as to control the stator core 1 within a reasonable temperature range.

[0055] Based on the above embodiments, in a preferred embodiment, the first outflow cavity 5 and the second outflow cavity 7 are separated and both are formed in the second housing 11. In this embodiment, by simultaneously forming the first outflow cavity 5 and the second outflow cavity 7 in the second housing 11, the structure is simple. After the second housing 11 is fixed at one end of the stator core 1, the first outflow cavity 5 can be communicated with the cooling flow channel. The non-outlet end winding 203 or the outlet end winding 202 of the stator winding 2 is located in the second outflow cavity 7. The second outflow cavity 7 can not only limit the stator winding 2, but also the cooling medium flowing into the second outflow cavity 7 can cool down the non-outlet end winding 203 or the outlet end winding 202.

[0056] Specifically, in an embodiment, the outlet end winding 202 is arranged in the second outflow cavity 7, such as Figures 7 to 9As shown, the second housing 11 includes a second annular bottom surface 1101, a second outer ring wall 1102 formed at the outer edge of the second annular bottom surface 1101, a second inner ring wall 1103 formed at the inner edge of the second annular bottom surface 1101, and a second intermediate ring wall 1104 located between the second outer ring wall 1102 and the second inner ring wall 1103. The second intermediate ring wall 1104 is spaced apart from the second annular bottom surface 1101 and is connected to the second outer ring wall 1102 through a third annular bottom surface 1105. The third annular bottom surface 1105 is parallel to the second annular bottom surface 1101. A first outflow cavity 5 is formed among the third annular bottom surface 1105, the second inner ring wall 1103, and the second outer ring wall 1102. The space in the second housing 11 other than the first outflow cavity 5 is a second outflow cavity 7. In this embodiment, the shape of the second outflow cavity 7 is more convenient for fixing and leading out the outgoing end winding 202. In an alternative embodiment, the shape of the second housing 11 may be the same as that of the first housing 8.

[0057] It should be noted that the diameter of the second intermediate ring wall 1104 is less than or equal to the inner diameter of the ring where the cooling channel is located and greater than the diameter of the circle where the bottom of the tooth groove is located. The diameter of the second inner ring wall 1103 is less than or equal to the inner diameter of the stator core 1, and the diameter of the second outer ring wall 1102 is greater than or equal to the outer diameter of the ring where the cooling channel is located and less than or equal to the outer diameter of the stator core 1. In a preferred embodiment, the diameter of the second outer ring wall 1102 is equal to the outer diameter of the ring where the cooling channel is located, the diameter of the second intermediate ring wall 1104 is equal to the inner diameter of the ring where the cooling channel is located, and the diameter of the second inner ring wall 1103 is equal to the inner diameter of the stator core 1.

[0058] Based on the above embodiment, in a preferred embodiment, both the first cooling medium outlet 501 and the second cooling medium outlet 701 are located on the second outer ring wall 1102. The first cooling medium outlet 501 is connected to a first cooling medium outflow pipe 12, and the second cooling medium outlet 701 is connected to a second cooling medium outflow pipe 13. In this embodiment, the cooling medium flows out from the side portions of the first medium outflow cavity and the second medium outflow cavity, which is convenient for connecting the first cooling medium outflow pipe 12 and the second cooling medium outflow pipe 13, and the first cooling medium outflow pipe 12 and the second cooling medium outflow pipe 13 will not interfere with other components of the motor. In an alternative embodiment, the second cooling medium outlet 701 may also be provided on the second annular bottom surface 1101.

[0059] Based on the above embodiments, in a preferred embodiment, the sealing structure is formed by sealant, and the sealing structure seals and connects the first housing 8, the stator core 1, and the second housing 11. Specifically, after the stator winding 2 is assembled in the stator core 1, the first housing 8 and the second housing 11 are respectively installed at both ends of the stator core 1, and then sealant is used for sealing treatment. The assembled structure can be immersed in the sealant. The sealing structure formed by the sealant is as shown in the figure. The sealing structure seals the gaps between the first housing 8 and the end face of the core, the gaps between the second housing 11 and the end face of the core, the openings of the tooth grooves, and the outside of the first housing 8 and the second housing 11. The sealing structure not only plays a sealing role but also a connecting role.

[0060] Based on the above embodiments, in a preferred embodiment, the stator core 1 includes stator punching sheets 101 and stator baffles 102 provided at both ends of the stator punching sheets 101. As Figure 3 shown, the stator punching sheet 101 includes a main body portion 1011 and a plurality of first groove portions 1012 provided inside the main body portion 1011 and evenly spaced along the circumferential direction. A plurality of cooling channels 1013 are provided in the main body portion 1011 and are evenly spaced along the circumferential direction and penetrate the main body portion 1011. The stator baffle 102 is provided with through holes 1021 corresponding to the cooling channels 1013 one by one and second groove portions corresponding to the first groove portions 1012 one by one. The through holes 1021 and the cooling channels 1013 form a cooling flow path, and the first groove portions 1012 and the second groove portions form tooth grooves. In this embodiment, specifically when manufacturing the stator core 1, after the stator punching sheets 101 and the stator baffles 102 are processed, the stator punching sheets 101 and the stator baffles 102 are stacked together to form the stator core 1. The through holes 1021 and the cooling channels 1013 form a cooling flow path, and the first groove portions 1012 and the second groove portions form tooth grooves. Then the stator core 1 is subjected to dipping treatment so that the gap between the stator punching sheets 101 and the stator baffles 102 is filled with paint, and the cooling flow path forms a sealed flow path.

[0061] Based on the above embodiments, in a preferred embodiment, the first cooling medium inlet 401, the second cooling medium inlet 601, the first cooling medium outlet 501, and the second cooling medium outlet 701 are all connected to the cooling device. Specifically, the first cooling medium inlet 401 and the second cooling medium inlet 601 are respectively connected to the medium flow outlet of the cooling device, and the first cooling medium outlet 501 and the second cooling medium outlet 701 are respectively connected to the medium flow inlet of the cooling medium. The cooled cooling medium after heat exchange flows back to the cooling device from the medium flow inlet, and after being cooled again by the cooling device, it flows out from the medium flow outlet and can continue to cool the stator core 1 and the stator winding 2. Therefore, the cooling medium can be recycled, reducing environmental pollution.

[0062] It should be noted that Figure 1Only one first cooling medium inlet 401, one first cooling medium outlet 501, one second cooling medium inlet 601 and one second cooling medium outlet 701 are shown, but in fact, the numbers of the first cooling medium inlet 401, the first cooling medium outlet 501, the second cooling medium inlet 601 and the second cooling medium outlet 701 can be two or more respectively, and can be set according to actual needs. The positions of the first cooling medium inlet 401, the first cooling medium outlet 501, the second cooling medium inlet 601 and the second cooling medium outlet 701 can also be adjusted according to the needs of the motor.

[0063] Embodiment 2

[0064] This embodiment provides a motor, including the stator assembly and the rotor assembly provided in the above embodiment.

[0065] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, Including: A stator core (1), including a stator yoke and teeth, with slots formed between adjacent teeth, and a plurality of cooling channels extending axially and penetrating the stator yoke are evenly distributed circumferentially within the stator yoke; A stator winding (2), including a middle winding (201) disposed in the slots, and a lead-end winding (202) and a non-lead-end winding (203) located at both ends of the middle winding (201); A first inflow cavity (4), having at least one first cooling medium inlet (401), the first inflow cavity (4) is disposed at the first end of the stator yoke and communicates with each of the cooling channels; A first outflow cavity (5), having at least one first cooling medium outlet (501), the first outflow cavity (5) is disposed at the second end of the stator yoke and communicates with each of the cooling channels; A second inflow cavity (6), having at least one second cooling medium inlet (601), the second inflow cavity (6) is disposed at the first end of the slots and communicates with each of the slots; A second outflow cavity (7), having at least one second cooling medium outlet (701), the second outflow cavity (7) is disposed at the second end of the slots and communicates with each of the slots, one of the lead-end winding (202) and the non-lead-end winding (203) is disposed in the second inflow cavity (6), and the other of the lead-end winding (202) and the non-lead-end winding (203) is disposed in the second outflow cavity (7); the first inflow cavity (4) and the second inflow cavity (6) are located at the same end of the stator core (1), the first outflow cavity (5) and the second outflow cavity (7) are located at the same end of the stator core (1), the first inflow cavity (4) and the second inflow cavity (6) are separated and both are formed within a first housing (8), the first housing (8) includes a first annular bottom surface (801), a first outer ring wall (802) formed at the outer edge of the first annular bottom surface (801), a first inner ring wall (803) formed at the inner edge of the first annular bottom surface (801), and a first middle ring wall (804) located between the first outer ring wall (802) and the first inner ring wall (803), a space between the first annular bottom surface (801), the first outer ring wall (802) and the first middle ring wall (804) constitutes the first inflow cavity (4), and a space between the first annular bottom surface (801), the first inner ring wall (803) and the first middle ring wall (804) constitutes the second inflow cavity (6); The first outflow cavity (5) and the second outflow cavity (7) are separated from each other and are both formed within the second housing (11). The outgoing end winding (202) is disposed within the second outflow cavity (7). The second housing (11) includes a second annular bottom surface (1101), a second outer ring wall (1102) formed at the outer edge of the second annular bottom surface (1101), a second inner ring wall (1103) formed at the inner edge of the second annular bottom surface (1101), and a second intermediate ring wall (1104) located between the second outer ring wall (1102) and the second inner ring wall (1103). The second intermediate ring wall (1104) is spaced apart from the second annular bottom surface (1101) and is connected to the second outer ring wall (1102) through a third annular bottom surface (1105). The third annular bottom surface (1105) is parallel to the second annular bottom surface (1101). The space formed among the third annular bottom surface (1105), the second inner ring wall (1103), and the second outer ring wall (1102) constitutes the first outflow cavity (5). The space within the second housing (11) other than the first outflow cavity (5) is the second outflow cavity (7).

2. The stator assembly according to claim 1, wherein, The stator assembly further includes a sealing structure that seals the notch of the tooth groove.

3. The stator assembly according to claim 2, wherein The first cooling medium inlet (401) is located on the first outer ring wall (802), and the second cooling medium inlet (601) is located on the first inner ring wall (803). The first cooling medium inlet (401) is connected to a first cooling medium inflow pipe (9), and the second cooling medium inlet (601) is connected to a second cooling medium inflow pipe (10). The second cooling medium inflow pipe (10) penetrates through the first outer ring wall (802).

4. The stator assembly according to claim 1, wherein, The stator core (1) is connected with a temperature sensor. A regulating valve, a pressure gauge, and / or a flow meter are respectively provided on the first cooling medium inflow pipe (9) and the second cooling medium inflow pipe (10). The stator assembly further includes a controller, and the controller is communicatively connected to the temperature sensor, the regulating valve, the pressure gauge, and / or the flow meter respectively.

5. The stator assembly according to claim 1, wherein The first cooling medium outlet (501) and the second cooling medium outlet (701) are both located on the second outer ring wall (1102). The first cooling medium outlet (501) is connected to a first cooling medium outflow pipe (12), and the second cooling medium outlet (701) is connected to a second cooling medium outflow pipe (13).

6. The stator assembly according to claim 2, wherein, The sealing structure is formed by a sealant, and the sealing structure is sealingly connected to the first housing (8), the stator core (1), and the second housing (11).

7. The stator assembly according to any one of claims 1-6, characterized in that, The stator core (1) includes stator punching sheets (101) and stator baffles (102) arranged at both ends of the stator punching sheets (101). The stator punching sheets (101) include a main body portion (1011) and a plurality of first groove portions (1012) arranged on the inner side of the main body portion (1011) and evenly spaced in the circumferential direction. A plurality of cooling channels (1013) are arranged in the main body portion (1011), evenly spaced in the circumferential direction and penetrating through the main body portion (1011). Through holes (1021) corresponding to the cooling channels (1013) one by one and second groove portions corresponding to the first groove portions (1012) one by one are arranged on the stator baffles (102). The through holes (1021) and the cooling channels (1013) form the cooling flow path, and the first groove portions (1012) and the second groove portions form the tooth grooves.

8. The stator assembly according to any one of claims 1 to 6, characterized in that, The first cooling medium inlet (401), the second cooling medium inlet (601), the first cooling medium outlet (501), and the second cooling medium outlet (701) are all connected to a cooling device.

9. A motor, characterized in that, It includes the stator assembly according to any one of claims 1 - 8.

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