Stator assembly and electric generator

Abstract

The application provides a kind of stator assembly and generator, it is related to generator technical field.The stator assembly includes stator core and stator shell, stator shell is sleeved on the outer circumferential side of stator core and is connected with stator core, the stator assembly further includes cooling sleeve, cooling sleeve is detachably sleeved on stator core and is located between stator core and stator shell, cooling sleeve inside flows through cooling liquid and is in heat conduction contact with the outer circumferential wall of stator core, cooling sleeve is provided with inlet and outlet.Cooling sleeve of the stator assembly is set as an independent and detachable component, which facilitates the processing of cooling sleeve, improves the production efficiency of cooling sleeve, and facilitates the inspection and replacement of cooling sleeve, avoids the defects of traditional way of integrating cooling sleeve with stator shell, such as processing and installation inconvenience, low production efficiency;At the same time, cooling sleeve can export the heat of stator core, improve the heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and in particular to a stator assembly and a generator. Background Technology

[0002] In recent years, wind power technology in the new energy field has developed rapidly, with the power density and torque density of generators continuously increasing, and the temperature of generators under operating conditions also rising. Currently, there are three main cooling methods for generators: air-to-air cooling, air-to-water cooling, and direct cooling. Air-to-air cooling utilizes the internal air circulation of the generator to exchange heat with the generator's top-mounted cooler, thereby achieving cooling. Air-to-water cooling consists of two parts: one part is that the stator casing itself has steel structure water channels welded to it, and the top has an air-to-water heat exchanger. The stator core directly contacts the steel structure water channels, and heat is carried away from the steel structure water channels by the circulating cooling water inside the channels. The other part is that the cooling water from the top-mounted air-to-water cooler exchanges heat with the circulating air inside the generator. Direct cooling involves directly introducing ambient air into the generator to exchange heat with the heat-generating components inside the generator.

[0003] Of the three cooling methods mentioned above, direct cooling is more effective than air-water cooling, and air-water cooling is more effective than air-air cooling. However, direct cooling, by introducing outside air directly into the generator, is highly dependent on the external environment, making it particularly difficult to apply in highly corrosive marine environments. Air-air cooling is less efficient and, for high-power generators, struggles to achieve ideal cooling performance at a low cost. Air-water cooling is more commonly used, but its relatively low thermal conductivity in steel water channels results in poor heat dissipation, and its structure is inconvenient to disassemble and assemble. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the defects of complex processing and inconvenient disassembly and assembly of the cooling structure of the stator assembly of the generator in the prior art, and to provide a stator assembly and generator.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A stator assembly includes a stator core and a stator housing. The stator housing is fitted around the outer periphery of the stator core and connected to the stator core. The stator assembly also includes a cooling sleeve, which is detachably fitted around the stator core and located between the stator core and the stator housing. Coolant flows inside the cooling sleeve and is in thermally conductive contact with the outer peripheral wall of the stator core. The cooling sleeve has an inlet and an outlet.

[0007] In this design, the cooling sleeve of the stator assembly is set as an independent and detachable component, which facilitates the processing of the cooling sleeve, improves the production efficiency of the cooling sleeve, and facilitates the inspection and replacement of the cooling sleeve. This avoids the defects of inconvenient processing and installation and low production efficiency caused by the traditional method of integrating the cooling sleeve with the stator housing. The stator core is prone to heat generation during operation, and the cooling sleeve has thermal contact with the outer peripheral wall of the stator core. The heat of the stator core can be dissipated through the coolant inside the cooling sleeve. The setting of the inlet and outlet facilitates the circulation of coolant into the cooling sleeve, improves the heat dissipation effect, and ensures the normal operation of the stator assembly.

[0008] Preferably, the stator assembly further includes an inlet pipe and an outlet pipe. The stator housing has two mounting holes. The inlet pipe and the outlet pipe pass through the two mounting holes respectively and are connected to the inlet and the outlet respectively.

[0009] In this design, the inlet and outlet pipes are conveniently located to allow coolant to flow into the cooling jacket, enabling continuous circulation and renewal of the coolant within the cooling jacket during operation of the stator assembly. This improves the cooling effect and prevents the stator core from overheating. The mounting holes on the stator housing facilitate the installation of the inlet and outlet pipes, thereby improving installation efficiency.

[0010] Preferably, both the liquid inlet and the liquid outlet are located on the outer peripheral wall of the cooling sleeve and each has a stepped portion. The stepped portion extends outward along the radial direction of the cooling sleeve and is fitted onto the outer peripheral wall of the liquid inlet and the liquid outlet.

[0011] In this design, the stepped section makes the connection between the cooling sleeve and the inlet and outlet pipes more secure, and also facilitates the initial positioning of the inlet and outlet pipes with the inlet and outlet of the cooling sleeve during installation, thus improving installation efficiency.

[0012] Preferably, the inner peripheral wall of the stepped portion is provided with internal threads, and the outer peripheral walls of the portions where the liquid inlet pipe and the liquid outlet pipe connect with the stepped portion are provided with corresponding external threads.

[0013] In this design, the inlet pipe and outlet pipe are threaded to the stepped portions of the inlet and outlet of the cooling sleeve, respectively, resulting in a simple structure and convenient connection.

[0014] Preferably, the cooling sleeve is made of aluminum.

[0015] In this solution, compared with the traditional cooling sleeve made of steel, the cooling sleeve of the present invention is made of aluminum, which has a higher thermal conductivity and better heat dissipation performance.

[0016] Preferably, thermally conductive adhesive is applied between the cooling sleeve and the outer peripheral wall of the stator core.

[0017] In this solution, the thermally conductive adhesive has good thermal conductivity, which can transfer the heat of the stator core to the cooling bushing, thereby improving the heat dissipation effect of the stator core.

[0018] Preferably, the stator core includes a first stator end plate, a core lamination, and a second stator end plate arranged coaxially along the axial direction of the stator core.

[0019] The outer circumferential diameter of the first stator end plate is greater than the outer circumferential diameter of the core lamination, and the outer circumferential diameter of the second stator end plate is equal to the outer circumferential diameter of the core lamination.

[0020] The cooling sleeve is fitted onto the outer peripheral wall of the core lamination and abuts against the first stator end plate.

[0021] In this design, the first stator end plate and the second stator end plate facilitate the connection between the cooling sleeve and the stator core. During the installation of the cooling sleeve, since the outer diameter of the second stator end plate is equal to the outer diameter of the core lamination, the cooling sleeve can be easily inserted into the core lamination from one end of the second stator end plate. After the cooling sleeve is installed in place, since the outer diameter of the first stator end plate is larger than the outer diameter of the core lamination, the cooling sleeve can abut against the first stator end plate, further ensuring that the cooling sleeve is installed in place.

[0022] Preferably, the stator housing has a first limiting part and a second limiting part on the inner peripheral wall facing the core lamination, and both the first limiting part and the second limiting part extend radially inward along the stator housing.

[0023] The first stator end plate abuts against the first limiting portion along the axial direction of the first stator end plate;

[0024] The second stator end plate abuts against the second limiting portion along the radial direction of the second stator end plate.

[0025] In this design, the first limiting part limits the first stator end plate along its axial direction, and the second limiting part limits the second stator end plate along its radial direction. At the same time, the two ends of the cooling sleeve abut against the first stator end plate and the second limiting part, respectively, which further increases the structural installation firmness and compactness.

[0026] Preferably, the stator assembly further includes a stator winding wound around the stator core.

[0027] In this scheme, the stator winding is wound on the stator core. The heat generated by the stator winding during operation can be transferred to the stator core and further dissipated through the cooling bushing, which helps to reduce the heat of the stator winding.

[0028] A generator comprising the stator assembly described above.

[0029] In this design, the cooling sleeve of the generator stator assembly is set as an independent and detachable component, which facilitates the processing of the cooling sleeve, improves the production efficiency of the cooling sleeve, and facilitates the inspection and replacement of the cooling sleeve. This improves the structural assembly efficiency of the generator, enhances the heat dissipation effect, and ensures the normal operation of the stator assembly.

[0030] The positive and progressive effects of this invention are as follows:

[0031] In this invention, the cooling sleeve of the stator assembly is set as an independent and detachable component, which facilitates the processing of the cooling sleeve, improves the production efficiency of the cooling sleeve, and facilitates the inspection and replacement of the cooling sleeve. This avoids the defects of inconvenient processing and installation and low production efficiency caused by the traditional method of integrating the cooling sleeve with the stator housing. The stator core is prone to heat generation during operation, and the cooling sleeve is in thermal contact with the outer peripheral wall of the stator core. The heat of the stator core can be dissipated through the coolant inside the cooling sleeve. The setting of the inlet and outlet facilitates the circulation of coolant into the cooling sleeve, improves the heat dissipation effect, and ensures the normal operation of the stator assembly. Attached Figure Description

[0032] Figure 1 This is a cross-sectional structural diagram of a stator assembly according to an embodiment of the present invention.

[0033] Figure 2 This is a partial cross-sectional structural diagram of a stator assembly according to an embodiment of the present invention.

[0034] Figure 3 This is a partial cross-sectional structural diagram of a cooling sleeve according to an embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram of the stator core structure according to an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] Stator core 1

[0038] First stator end plate 11

[0039] Iron core lamination 12

[0040] Second stator end plate 13

[0041] Rib 14

[0042] Stator housing 2

[0043] First limiting part 21

[0044] Second limiting part 22

[0045] Cooling sleeve 3

[0046] Inlet 31

[0047] Liquid outlet 32

[0048] Inlet pipe 4

[0049] 5 Discharge tubes

[0050] Step 6

[0051] Stator winding 7 Detailed Implementation

[0052] The present invention will be described more clearly and completely below by way of embodiments and in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0053] like Figures 1 to 4 As shown, this embodiment provides a stator assembly, including a stator core 1 and a stator housing 2. The stator housing 2 is sleeved on the outer periphery of the stator core 1 and connected to the stator core 1. The stator assembly also includes a cooling sleeve 3, which is detachably sleeved on the stator core 1 and located between the stator core 1 and the stator housing 2. Coolant flows inside the cooling sleeve 3 and is in thermally conductive contact with the outer periphery of the stator core 1. The cooling sleeve 3 is provided with an inlet 31 and an outlet 32. The cooling sleeve 3 of the stator assembly is designed as an independent and detachable component, which facilitates the processing of the cooling sleeve 3, improves its production efficiency, and makes it easier to inspect and replace. This avoids the inconvenience of processing and installation and the low production efficiency caused by the traditional method of integrating the cooling sleeve 3 with the stator housing 2. The stator core 1 is prone to heat generation during operation, and the cooling sleeve 3, in thermal contact with the outer peripheral wall of the stator core 1, allows the heat to be dissipated through the coolant inside the cooling sleeve 3. The inlet 31 and outlet 32 ​​facilitate the circulation of coolant into the cooling sleeve 3, improving heat dissipation and ensuring the normal operation of the stator assembly. Furthermore, the independent design of the cooling sleeve 3 allows for more diverse shapes and designs, no longer limited by the traditional processing techniques of cooling sleeve 3 (i.e., steel structure water channels). It can be achieved through casting, machining, welding, etc., which helps reduce the production cost of the cooling sleeve 3.

[0054] In this embodiment, the stator assembly further includes an inlet pipe 4 and an outlet pipe 5. The stator housing 2 has two mounting holes (not shown in the figure), through which the inlet pipe 4 and outlet pipe 5 pass, respectively, and are connected to the inlet port 31 and the outlet port 32. The inlet pipe 4 and outlet pipe 5 facilitate the introduction of coolant into the cooling sleeve 3, enabling continuous circulation and renewal of the coolant within the cooling sleeve 3 during operation, thereby improving the cooling effect and preventing the stator core 1 from overheating. The mounting holes on the stator housing 2 facilitate the installation of the inlet pipe 4 and outlet pipe 5, which is beneficial for improving installation efficiency.

[0055] In this embodiment, both the inlet 31 and the outlet 32 ​​are located on the outer peripheral wall of the cooling sleeve 3 and each has a stepped portion 6. The stepped portion 6 extends radially outward along the cooling sleeve 3 and fits onto the outer peripheral wall of the inlet pipe 4 and the outlet pipe 5. The stepped portion 6 makes the connection between the cooling sleeve 3 and the inlet pipe 4 and the outlet pipe 5 more secure, and at the same time facilitates the initial positioning of the inlet pipe 4 and the outlet pipe 5 with the inlet 31 and the outlet 32 ​​of the cooling sleeve 3 during installation, thereby improving installation efficiency.

[0056] In this embodiment, the inner peripheral wall of the stepped portion 6 is provided with internal threads, and the outer peripheral walls of the portions where the liquid inlet pipe 4 and the liquid outlet pipe 5 connect with the stepped portion 6 are provided with external threads. The liquid inlet pipe 4 and the liquid outlet pipe 5 are respectively threaded to the stepped portions 6 of the liquid inlet 31 and the liquid outlet 32 ​​of the cooling sleeve 3, which is simple in structure and convenient in connection.

[0057] In this embodiment, the cooling sleeve 3 is made of aluminum. Compared to traditional steel water channels, which are constructed with steel, the cooling sleeve 3 of this invention uses aluminum, which has a higher thermal conductivity and better heat dissipation performance. Furthermore, aluminum has better corrosion resistance, eliminating the need for special anti-corrosion treatments.

[0058] In this embodiment, thermally conductive adhesive is applied between the cooling sleeve 3 and the outer peripheral wall of the stator core 1. The thermally conductive adhesive has good thermal conductivity and can transfer the heat of the stator core 1 to the cooling sleeve 3, thereby improving the heat dissipation effect of the stator core 1.

[0059] In this embodiment, the stator core 1 includes a first stator end plate 11, a core lamination 12, and a second stator end plate 13 arranged coaxially along the axial direction of the stator core 1; the outer circumferential diameter of the first stator end plate 11 is larger than the outer circumferential diameter of the core lamination 12, and the outer circumferential diameter of the second stator end plate 13 is equal to the outer circumferential diameter of the core lamination 12; the cooling sleeve 3 is sleeved on the outer circumferential wall of the core lamination 12 and abuts against the first stator end plate 11. The first stator end plate 11 and the second stator end plate 13 facilitate the connection between the cooling sleeve 3 and the stator core 1. During the installation of the cooling sleeve 3, since the outer diameter of the second stator end plate 13 is equal to the outer diameter of the core lamination 12, the cooling sleeve 3 can be easily inserted into the core lamination 12 from one end of the second stator end plate 13. After the cooling sleeve 3 is installed in place, since the outer diameter of the first stator end plate 11 is larger than the outer diameter of the core lamination 12, the cooling sleeve 3 can abut against the first stator end plate 11, further ensuring that the cooling sleeve 3 is installed in place.

[0060] In this embodiment, the stator housing 2 has a first limiting part 21 and a second limiting part 22 on its inner peripheral wall facing the core lamination 12. Both the first limiting part 21 and the second limiting part 22 extend radially inward along the stator housing 2. The first stator end plate 11 abuts against the first limiting part 21 along its axial direction. The second stator end plate 13 abuts against the second limiting part 22 along its radial direction. The first limiting part 21 limits the first stator end plate 11 along its axial direction, and the second limiting part 22 limits the second stator end plate 13 along its radial direction. At the same time, the two ends of the cooling sleeve 3 abut against the first stator end plate 11 and the second limiting part 22, respectively, further increasing the structural installation firmness and compactness.

[0061] In this embodiment, the stator assembly further includes a stator winding 7, which is wound around the stator core 1. Since the stator winding 7 is wound around the stator core 1, the heat generated by the stator winding 7 during operation can be transferred to the stator core 1 and further dissipated through the cooling sleeve 3, which helps to reduce the heat generated by the stator winding 7.

[0062] The assembly process of the stator assembly in this embodiment is as follows (but is not limited to the following assembly method):

[0063] The first stator end plate 11, the core lamination 12, and the second stator end plate 13 are fixed by overlapping welding and connected by stiffener 14. The specific connection process can be achieved using existing technology. The cooling sleeve 3 is sleeved with the stator core 1 by heat fitting. Then the stator housing 2 is connected to the stator core 1. Specifically, the stator housing 2 is welded and fixed to the first stator end plate 11 and the second stator end plate 13. The liquid inlet pipe 4 and the liquid outlet pipe 5 pass through the mounting holes of the stator housing 2 and are respectively connected to the liquid inlet 31 and the liquid outlet 32 ​​of the cooling sleeve 3.

[0064] This embodiment also provides a generator, which includes the stator assembly described above. The cooling sleeve 3 of the generator's stator assembly is configured as an independent and detachable component, facilitating the processing of the cooling sleeve 3, improving its production efficiency, and simplifying its inspection and replacement. This improves the generator's structural assembly efficiency, enhances heat dissipation, and ensures the normal operation of the stator assembly. Furthermore, the generator in this embodiment also includes a top-mounted cooler. The top-mounted cooler can be implemented using existing technology. Due to the improved heat dissipation effect of the cooling sleeve 3 of the stator assembly, the heat dissipation power of the top-mounted cooler is reduced, which helps to lower the overall cost of the generator.

[0065] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A stator assembly, comprising a stator core and a stator housing, wherein the stator housing is sleeved on the outer periphery of the stator core and connected to the stator core, characterized in that, The stator assembly also includes a cooling sleeve, which is detachably fitted onto the stator core and located between the stator core and the stator housing. Coolant flows inside the cooling sleeve and is in thermal contact with the outer peripheral wall of the stator core. The cooling sleeve is provided with an inlet and an outlet. The stator core includes a first stator end plate, a core lamination, and a second stator end plate arranged coaxially along the axial direction of the stator core. The outer circumferential diameter of the first stator end plate is greater than the outer circumferential diameter of the core lamination, and the outer circumferential diameter of the second stator end plate is equal to the outer circumferential diameter of the core lamination. The cooling sleeve is fitted onto the outer peripheral wall of the core lamination and abuts against the first stator end plate; The stator housing has a first limiting part and a second limiting part on its inner peripheral wall facing the iron core lamination, and both the first limiting part and the second limiting part extend inward along the radial direction of the stator housing. The first stator end plate abuts against the first limiting portion along the axial direction of the first stator end plate; The second stator end plate abuts against the second limiting portion along the radial direction of the second stator end plate.

2. The stator assembly as claimed in claim 1, characterized in that, The stator assembly further includes an inlet pipe and an outlet pipe. The stator housing has two mounting holes. The inlet pipe and the outlet pipe pass through the two mounting holes respectively and are connected to the inlet port and the outlet port respectively.

3. The stator assembly as described in claim 2, characterized in that, Both the liquid inlet and the liquid outlet are located on the outer peripheral wall of the cooling sleeve and are provided with a stepped portion. The stepped portion protrudes outward along the radial direction of the cooling sleeve and is sleeved on the outer peripheral wall of the liquid inlet and the liquid outlet.

4. The stator assembly as claimed in claim 3, characterized in that, The inner peripheral wall of the stepped portion is provided with internal threads, and the outer peripheral walls of the parts where the liquid inlet pipe and the liquid outlet pipe are connected to the stepped portion are provided with corresponding external threads.

5. The stator assembly as claimed in claim 1, characterized in that, The cooling sleeve is made of aluminum.

6. The stator assembly as claimed in claim 1, characterized in that, Thermally conductive adhesive is applied between the cooling sleeve and the outer peripheral wall of the stator core.

7. The stator assembly as claimed in claim 1, characterized in that, The stator assembly further includes a stator winding wound around the stator core.

8. A generator, characterized in that, The generator includes a stator assembly as described in any one of claims 1-7.

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