Stator assembly, motor, air conditioner

Abstract

The present invention provides a stator assembly, a motor, and an air conditioner. The stator assembly includes a stator core, and a plurality of cooling channels are formed in the yoke portion of the stator core. The cooling channels include a first flow-through section. Along the axial direction of the stator core, the area of the radial cross-section of the first flow-through section decreases. According to the present invention, the radial cross-section area at one end of the first flow-through section is larger than that at the other end. In this way, in the region where the radial cross-section area of the first flow-through section is small, that is, the opening of the stator core is small, which can prevent the iron loss of the core yoke from increasing sharply due to too large an opening. At the same time, in the region where the radial cross-section area of the first flow-through section is large, the flow rate of the cooling medium can be ensured, thereby ensuring the effective cooling of the stator core of the motor, ensuring the cooling effect, and further improving the power density, torque density, and stability of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and particularly relates to a stator assembly, a motor, and an air conditioner. Background Art

[0002] During the operation of a motor, it is affected by various losses, and the heating problem has always been a key and difficult problem in the design and R & D process. The higher the stator temperature, the greater the loss under the same current, and the lower the electromagnetic performance, and it may even not be able to operate for a long time. In terms of the existing technology, the cooling of the stator generally adopts heat pipes embedded in the winding for heat dissipation, or heat transfer and dissipation through a housing with a water-cooled flow channel, or directly ventilating and cooling the stator and winding in the housing. In order to ensure the cooling effect, generally, it is necessary to open holes in the yoke of the stator core to form a flow channel for the cooling medium. If the opening is too large, it will cause an increase in the local magnetic density near the cooling flow channel (opening), resulting in a sharp increase in the iron loss in the local area of the dug hole (because the stator iron loss is proportional to the square of the magnetic density), and if the opening is too small, the flow rate of the cooling medium will be small and the cooling effect will be poor. Summary of the Invention

[0003] Therefore, the present invention provides a stator assembly, a motor, and an air conditioner, which can effectively cool the stator core of the motor while having a relatively small impact on the electromagnetic performance of the motor, reduce the temperature of the motor, and further improve the power density, torque density, and stability of the motor.

[0004] In order to solve the above problems, the present invention provides a stator assembly, including a stator core, and a plurality of cooling flow channels are formed in the yoke of the stator core. The cooling flow channel includes a first flow section, and along the axial direction of the stator core, the area of the radial section of the first flow section decreases.

[0005] Preferably, the radial section of the first flow section is circular.

[0006] Preferably, the first flow section has a first port on the first axial end face of the stator core and a second port inside the stator core. The diameter of the first port is a, and the diameter of the second port is b, and a > b.

[0007] Preferably, b / a ≤ 0.65.

[0008] Preferably, a first cooling pipe is connected to the first port, and the first cooling pipe is communicated with an external cooling medium supply component.

[0009] Preferably, coils are installed on the teeth of the stator core. The coil has a first end corresponding to the first axial end face, and the first cooling pipe is in contact with the first outer circumferential surface of the first end.

[0010] Preferably, the cross-section of the first cooling pipe is circular, and the flow diameter of the first cooling pipe is not less than a; and / or, a heat dissipation silica gel is provided between the first outer peripheral surface of the first end portion and the first cooling pipe.

[0011] Preferably, the first outer peripheral surface includes a first outer circumferential surface coaxially arranged with the stator core, a first outer end surface parallel to the first axial end surface, and a first outer inclined surface between the first outer circumferential surface and the first axial end surface. The first cooling pipe includes a first contact pipe section in contact with the first outer circumferential surface, a second contact pipe section in contact with the first outer end surface, and a third contact pipe section in contact with the first outer inclined surface.

[0012] Preferably, the second contact pipe section is in an S shape extending along the circumferential direction of the first outer circumferential surface.

[0013] Preferably, the cooling flow path further includes a second flow section. The stator core has a central axis, and a plane perpendicular to the central axis is a first plane. The stator core is symmetric about the first plane, and the second flow section is symmetric with the first flow section about the first plane.

[0014] Preferably, the cooling flow path further includes a third flow section. The first flow section and the second flow section are communicated through the third flow section, and the radial end surface of the third flow section is circular, and the diameters of any radial cross-sections of the third flow section are equal.

[0015] Preferably, the diameter of any radial end surface of the third flow section is equal to b; and / or, the axial extension length of the first flow section is La, and the axial extension length of the third flow section is Lb, and La / Lb≥0.25.

[0016] The present invention also provides a motor, including the above-mentioned stator assembly.

[0017] The present invention also provides an air conditioner, including the above-mentioned motor.

[0018] For a stator assembly, a motor, and an air conditioner provided by the present invention, the first flow section is no longer a radial cross-sectional area that is equal along the axial direction of the stator core in the prior art, but a design with a decreasing area. That is, the radial cross-sectional area at one end of the first flow section is larger than that at the other end. In this way, in the area where the radial cross-sectional area of the first flow section is small, that is, the opening of the stator core is small, it can prevent the iron loss of the core yoke from increasing sharply due to the over-large opening. At the same time, in the area where the radial cross-sectional area of the first flow section is large, the flow rate of the cooling medium can be ensured, thereby ensuring the effective cooling of the stator core of the motor, ensuring the cooling effect, and further being able to improve the power density, torque density, and stability of the motor. Description of the Drawings

[0019] Figure 1 Schematic diagram of the internal structure of the motor according to an embodiment of the present invention;

[0020] Figure 2 is Figure 1 schematic diagram of the structure of the stator assembly in

[0021] Figure 3 Schematic diagram of the internal structure of the motor according to another embodiment of the present invention.

[0022] The reference numerals are shown as:

[0023] 1, stator core; 21, first flow passage; 211, first port; 212, second port; 22, second flow passage; 23, third flow passage; 3, coil; 31, first end; 311, first outer circumferential surface; 312, first outer end face; 313, first outer inclined surface; 32, second end; 41, first cooling pipe; 411, first contact pipe section; 412, second contact pipe section; 413, third contact pipe section; 42, second cooling pipe; 51, first end cover; 52, second end cover; 6, housing. Detailed implementation manners

[0024] Referring to in combination Figures 1 to 3 As shown, according to an embodiment of the present invention, a stator assembly is provided, including a stator core 1. A plurality of cooling channels are formed in the yoke portion of the stator core 1. The cooling channels include a first flow passage 21. Along the axial direction of the stator core 1, the cross-sectional area of the radial section of the first flow passage 21 decreases (specifically, for example, a conical hole). The first flow passage 21 in this technical solution no longer has a constant cross-sectional area in the axial direction of the stator core 1 as in the prior art, but is designed with a decreasing area, that is, the cross-sectional area of one end of the first flow passage 21 is larger than that of the other end. In this way, in the region where the cross-sectional area of the radial section of the first flow passage 21 is small, that is, the opening of the stator core 1 is small, which can prevent the iron loss of the core yoke from increasing sharply due to too large an opening. At the same time, in the region where the cross-sectional area of the radial section of the first flow passage 21 is large, the flow rate of the cooling medium can be ensured, thereby ensuring the effective cooling of the stator core 1 of the motor, ensuring the cooling effect, and further improving the power density, torque density and stability of the motor.

[0025] In some embodiments, the radial cross-section of the first flow passage 21 is circular. Adopting a circular radial cross-section can simplify the manufacturing process of the first flow passage 21. On this basis, further, the first flow passage 21 has a first port 211 on the axial first end face of the stator core 1 and a second port 212 inside the stator core 1. The diameter of the first port 211 is a, and the diameter of the second port 212 is b, where a > b. In appearance, the first flow passage 21 has a flared structure, and the flared opening gradually expands from the axial inner side to the axial outer side of the stator core 1. The aforementioned first port 211 and second port 212 can be respectively one of the inlets or outlets of the cooling medium. The present invention does not specifically limit this. In this technical solution, the first port 211 with a larger diameter is arranged close to the axial first end face, which is closely related to the heat dissipation of the coil 3 (also the stator winding) arranged at the shaft end of the stator core 1. Specifically, since the coil 3 is arranged at the shaft end of the stator core 1, and the coil 3 blocks the axial first end, resulting in a greater heat dissipation requirement in this area. Correspondingly, arranging the first port 211 with a larger diameter is obviously beneficial for effective cooling and heat dissipation in this area.

[0026] In some embodiments, b / a ≤ 0.65 to ensure the electromagnetic performance of the corresponding motor.

[0027] It can be understood that after the stator assembly is assembled into the corresponding housing 6 to form the corresponding motor, the stator core 1 at the position where the cooling channel is arranged can be effectively cooled by introducing the corresponding cooling medium into the housing 6. At this time, the cooling structure is relatively open. Therefore, in terms of the selection of the cooling medium, cooling gases (such as air, carbon dioxide gas), cooling refrigerants, etc. can be used, but cooling media such as cooling oil and water cannot be used. Therefore, preferably, a first cooling pipe 41 is connected to the first port 211, and the first cooling pipe 41 is communicated with an external cooling medium supply component. That is, through the arrangement of the first cooling pipe 41, the range of use of the cooling medium can be increased.

[0028] In some embodiments, the teeth of the stator core 1 are provided with the coil 3, and the coil 3 has a first end 31 corresponding to the axial first end face. The first cooling pipe 41 is in contact with the first outer peripheral surface of the first end 31. In this technical solution, through the contact arrangement of the first cooling pipe 41 and the first end 31, the first end 31 of the coil 3 can be efficiently cooled, further improving the cooling effect of the motor.

[0029] The cross-section of the first cooling pipe 41 is also circular, which is the same as that of the first flow section 21. The flow diameter of the first cooling pipe 41 is not less than a, so as to realize the precise fitting connection between the first cooling pipe 41 and the first port 211 of the first flow section 21. The connection method between the first cooling pipe 41 and the first port 211 can be a feasible method such as welding (and an O-ring is used to seal the connection part); preferably, a heat dissipation silica gel (not shown in the figure) is provided between the first outer circumferential surface of the first end portion 31 and the first cooling pipe 41. On the one hand, the heat dissipation silica gel can play a role in fixing the first cooling pipe 41, and on the other hand, it can improve the heat conduction between the first cooling pipe 41 and the first outer circumferential surface, improving the cooling effect.

[0030] In some embodiments, the first outer circumferential surface includes a first outer circumferential surface 311 coaxially arranged with the stator core 1, a first outer end surface 312 parallel to the axial first end surface, and a first outer inclined surface 313 between the first outer circumferential surface 311 and the axial first end surface. The first cooling pipe 41 includes a first contact pipe section 411 in contact with the first outer circumferential surface 311, a second contact pipe section 412 in contact with the first outer end surface 312, and a third contact pipe section 413 in contact with the first outer inclined surface 313. Thus, each pipe section of the first cooling pipe 41 is arranged corresponding to each surface of the first outer circumferential surface of the first end portion 31, realizing the all-round contact cooling of the first end portion 31. Further, the second contact pipe section 412 is in an S shape extending along the circumferential direction of the first outer circumferential surface 311. It can be understood that the second contact pipe section 412 includes at least one S shape, and of course it can include multiple S shapes, so as to better cool the first outer circumferential surface 311.

[0031] In some embodiments, the cooling flow path further includes a second flow section 22. The stator core 1 has a central axis. A plane perpendicular to the central axis is a first plane. The stator core 1 is symmetric about the first plane, and the second flow section 22 is symmetric with the first flow section 21 about the first plane, so that the heat dissipation of the stator core 1 in the axial direction is more balanced and there will be no phenomenon of local overheating. Correspondingly, a second cooling pipe 42 is connected to the upper opening of the axial second end surface of the stator core 1 at the second flow section 22. The setting of the second cooling pipe 42 is also symmetric with the first cooling pipe 41 about the first plane, that is, the second cooling pipe 42 is in contact with the second end portion 32 of the coil 3.

[0032] Further, the cooling channel further includes a third flow section 23. The first flow section 21 and the second flow section 22 are connected through the third flow section 23. The radial end face of the third flow section 23 is circular, and the diameter of any radial cross-section of the third flow section 23 is equal. The diameter of the third flow section 23 is the minimum value of the cooling channel and is located at the axial center position of the stator core 1. Thus, the middle section of the cooling channel is the thinnest and the opening is the smallest, with the least influence on the local magnetic density and iron loss here, and can minimize the adverse effects on the electromagnetic performance of the motor caused by the opening to the greatest extent.

[0033] Preferably, the diameter of any radial end face of the third flow section 23 is equal to b, that is, the third flow section 23 is an equal-diameter section with the same diameter as the second port 212, which is convenient for its processing and production.

[0034] The stator core 1 is manufactured by stacking punching sheets. Specifically, three core segments with the first flow section 21, the second flow section 22, and the third flow section 23 can be stacked separately and specifically, and then holes are drilled on the three core segments respectively to obtain the first flow section 21, the second flow section 22, and the third flow section 23, and then the three are assembled and stacked into the stator core 1 to avoid the influence of secondary processing.

[0035] In some embodiments, the axial extension length of the first flow section 21 is La, and the axial extension length of the third flow section 23 is Lb, and La / Lb≥0.25, which ensures a relatively small influence on the electromagnetic performance of the opening while providing the best cooling effect.

[0036] The present invention very conveniently solves the problem of serious stator heating but insufficient cooling in high-speed motors, can effectively prevent the phenomenon of relatively high local temperature of the stator, thereby improving the overall temperature control performance and service life of the motor, and has the advantages of simple structure, convenient installation, wide application range, low cost, etc.

[0037] An embodiment of the present invention further provides a motor, including the above-mentioned stator assembly. The stator assembly is located in the housing 6. The first end cover 51 and the second end cover 52 are respectively provided at the axial two ends of the housing 6. Correspondingly, a first through hole corresponding to the first cooling pipe 41 is provided on the first end cover 51, and the first cooling pipe 41 passes through the first through hole. A second through hole corresponding to the second cooling pipe 42 is provided on the second end cover 52, and the second cooling pipe 42 passes through the second through hole. In addition, without considering the processing cost, the housing 6 can also be filled with water tanks, which can provide a better cooling effect.

[0038] An embodiment of the present invention further provides an air conditioner, including the above-mentioned motor.

[0039] It is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0040] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, It includes a stator core (1), and a plurality of cooling channels are formed in the yoke portion of the stator core (1). The cooling channels include a first flow segment (21). Along the axial direction of the stator core (1), the area of the radial cross-section of the first flow segment (21) decreases; the first flow segment (21) has a first port (211) on the first axial end face of the stator core (1); a first cooling pipe (41) is connected to the first port (211), and the first cooling pipe (41) is communicated with an external cooling medium supply component; coils (3) are installed on the teeth of the stator core (1), the coils (3) have a first end portion (31) corresponding to the first axial end face, and the first cooling pipe (41) is in contact with the first outer circumferential surface of the first end portion (31); the first flow segment (21) also has a second port (212) inside the stator core (1), the diameter of the first port (211) is a, the diameter of the second port (212) is b, a > b and b / a ≤ 0.

65.

2. The stator assembly according to claim 1, wherein, The radial cross-section of the first flow segment (21) is circular.

3. The stator assembly according to claim 1, wherein, The cross-section of the first cooling pipe (41) is circular, and the flow diameter of the first cooling pipe (41) is not less than a; and / or, heat dissipation silica gel is provided between the first outer circumferential surface of the first end portion (31) and the first cooling pipe (41).

4. The stator assembly according to claim 3, wherein The first outer circumferential surface includes a first outer circumferential surface (311) coaxially arranged with the stator core (1), a first outer end surface (312) parallel to the first axial end face, and a first outer inclined surface (313) between the first outer circumferential surface (311) and the first axial end face. The first cooling pipe (41) includes a first contact pipe segment (411) in contact with the first outer circumferential surface (311), a second contact pipe segment (412) in contact with the first outer end surface (312), and a third contact pipe segment (413) in contact with the first outer inclined surface (313).

5. The stator assembly according to claim 4, wherein, The first contact pipe segment (411) is in an S shape extending along the circumferential direction of the first outer circumferential surface (311).

6. The stator assembly according to any one of claims 2 to 5, characterized in that, The cooling channel further includes a second flow segment (22). The stator core (1) has a central axis, a plane perpendicular to the central axis is a first plane, the stator core (1) is symmetric about the first plane, and the second flow segment (22) is symmetric with the first flow segment (21) about the first plane.

7. The stator assembly according to claim 6, characterized in that, The cooling channel further includes a third flow segment (23). The first flow segment (21) is communicated with the second flow segment (22) through the third flow segment (23), and the radial end face of the third flow segment (23) is circular, and the diameter of any radial cross-section of the third flow segment (23) is equal.

8. The stator assembly according to claim 7, characterized in that, The diameter of any radial end face of the third flow segment (23) is equal to b; and / or, the axial extension length of the first flow segment (21) is La, the axial extension length of the third flow segment (23) is Lb, and La / Lb ≥ 0.

25.

9. A motor, comprising a stator assembly, characterized in that, The stator assembly is the stator assembly according to any one of claims 1 to 8.

10. An air conditioner, comprising a motor, characterized in that, The motor is the motor according to claim 9.

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