Water-cooled motor stator core fixing structure and fixing method thereof

Abstract

The invention belongs to the technical field of water-cooled motor stators, and particularly relates to a water-cooled motor stator core fixing structure and method. The combined type stator core is mainly composed of a machine shell, a combined type stator core, a pressing ring, a fastening screw rod, a medium inlet pipe and a medium outlet pipe, the combined type stator core comprises a stator core segment I, a stator core segment II, an inserting pipe I and an inserting pipe II, and the inserting pipe I and the inserting pipe II are additionally arranged in the stator core segment II. A cooling pipeline system is formed by the cooling pipeline, the stator core segment I, the insertion pipe I and the insertion pipe II, the cooling pipeline system comprises multiple layers of reciprocating baffling arc-shaped pipelines, one end of each arc-shaped pipeline is communicated with a medium inlet pipe through a pressing ring, and the other end of each arc-shaped pipeline is communicated with a medium outlet pipe. According to the fixing structure, the fixing and mounting requirements of the combined stator core with the built-in cooling pipeline can be met, the heat dissipation performance of the stator core can be improved, the rapid assembling requirements of the combined stator core are met, and the assembled structure is high in stability.

Description

Technical Field

[0001] The invention belongs to the technical field of water-cooled motor stators, and in particular relates to a water-cooled motor stator core fixing structure and a fixing method thereof. Background Art

[0002] At present, most electric motors used in electric vehicles are water-cooled motors. The reason is that compared with air-cooled motors, water-cooled motors have 1.5 to 2 times the power and torque of air-cooled motors of the same volume. Under the premise of requiring the same power and torque, the use of water-cooled motors can reduce weight, and weight reduction is crucial to increasing the driving range of electric vehicles. The stator and windings generate a rotating magnetic field, provide a magnetic field path, and transmit torque to the housing. Therefore, the relative stillness of the stator core and the housing has a significant impact on the performance of the motor, and there can be no relative movement in the axial and circumferential directions.

[0003] The traditional water-cooled motor stator core fixing structure has been found to have shortcomings during use. First, it cannot meet the fixed installation requirements of the combined stator core with built-in cooling pipelines, and cannot improve the heat dissipation performance of the stator core; second, it cannot meet the rapid assembly requirements of the combined stator core, and the structural stability after assembly is not ideal. Therefore, it is necessary to optimize and improve the traditional water-cooled motor stator core fixing structure. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the conventional technology and to provide a water-cooled motor stator core fixing structure and a fixing method thereof.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] A water-cooled motor stator core fixing structure comprises a casing, a combined stator core, a pressure ring, a fastening screw, an inlet medium pipe and an outlet medium pipe; the combined stator core is placed in the inner cavity of the casing, the casing is provided with a pressure ring abutting against the combined stator core through a fastening screw, the outer side of the casing is provided with an inlet medium pipe and an outlet medium pipe, and the inlet medium pipe, the outlet medium pipe, the pressure ring, the built-in cooling pipeline system of the combined stator core and the external cooling circulation pump together constitute a cooling and heat dissipation circuit.

[0007] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the combined stator core includes a stator core segment I, a stator core segment II, a plug-in tube I and a plug-in tube II, a plurality of the stator core segments I and one stator core segment II are spliced ​​together to form a circle, and the plug-in tube I and the plug-in tube II are plugged and installed in the stator core segment II.

[0008] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the stator core segment I includes a first arc segment, the inner arc surface of the first arc segment is evenly distributed with a plurality of first stator slots, the outer arc surface of the first arc segment is provided with a first key slot, and the first arc segment is provided with a plurality of first arc pipelines in parallel.

[0009] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the stator core segment II includes a second arc segment, the inner arc surface of the second arc segment is evenly distributed with a plurality of second stator slots, the outer arc surface of the second arc segment is provided with a second key slot, the second arc segment is provided with a first plug-in slot for facilitating the insertion of the plug-in tube I and a second plug-in slot for facilitating the insertion of the plug-in tube II, the second arc segment is provided with two rows of second arc pipelines connected to the first plug-in slot and the second plug-in slot respectively, and the second arc segment is also provided with a lead-out hole that can be connected to the outlet medium pipe after docking.

[0010] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the plug-in tube I is composed of a first plug-in tube and a first hexagonal positioning head connected as one body, the outer diameter of the first plug-in tube matches the diameter of the first plug-in slot, a plurality of first flow guide holes are arranged side by side on the side of the first plug-in tube, two adjacent first flow guide holes form a group, a blocking block is installed between the two adjacent groups of first flow guide holes, and an inlet hole connected to the adjacent first flow guide hole in the first plug-in tube is arranged in the first hexagonal positioning block.

[0011] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the plug-in tube II is composed of a second plug-in tube and a second hexagonal positioning head connected as one body, the outer diameter of the second plug-in tube matches the diameter of the second plug-in slot, a plurality of second flow guide holes are arranged side by side on the side of the second plug-in tube, two adjacent second flow guide holes form a group, a block is installed on the second plug-in tube between two adjacent groups of second flow guide holes, and the side of the second plug-in tube is also provided with an outlet hole that can be connected to the outlet hole after docking.

[0012] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the casing includes a cylindrical shell, one side of the cylindrical shell is provided with an opening and a flange is provided at the opening, the other side of the cylindrical shell is provided with an end plate and a shaft outlet hole is provided at the center of the end plate, the inner cavity of the cylindrical shell is located near the end plate and is provided with an inner positioning ring for limiting the inner position of the combined stator core, the inner cavity of the cylindrical shell is circumferentially installed with a plurality of convex key strips that cooperate with the first keyway and the second keyway, and the convex key strip is provided with a fastening screw hole that cooperates with the fastening screw.

[0013] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the pressure ring includes a pressure ring body, the inner hole diameter of the pressure ring body is equal to the inner hole diameter of the inner positioning ring, and the specification of the inner hole diameter enables it to expose the stator winding of the combined stator core, the outer periphery of the pressure ring body is provided with a third keyway that cooperates with the convex key bar, and the third keyway is provided with a fastening step hole that cooperates with the fastening screw, and the pressure ring body is provided with a first hexagonal positioning groove, a second hexagonal positioning groove and an L-shaped flow hole, the first hexagonal positioning groove cooperates with the first hexagonal positioning head, the second hexagonal positioning groove cooperates with the second hexagonal positioning head, and the L-shaped flow hole is used to connect the medium inlet pipe and the inlet hole of the first hexagonal positioning head to each other.

[0014] Furthermore, in the above-mentioned water-cooled motor stator core fixing structure, the medium filled in the cooling and heat dissipation circuit is insulating thermal oil, and the cooling circulation pump can provide circulation power for the insulating thermal oil, cool the input high-temperature insulating thermal oil, and output low-temperature insulating thermal oil.

[0015] The present invention also provides a method for fixing a stator core of a water-cooled motor, which is implemented based on the above-mentioned stator core fixing structure of the water-cooled motor and includes the following steps:

[0016] S1, splicing the stator core segment I, the stator core segment II, the plug-in tube I and the plug-in tube II into a combined stator core, placing the combined stator core in the inner cavity of the housing, so that the first key groove of the stator core segment I is engaged with the outer side of the corresponding convex key bar, the second key groove of the stator core segment II is engaged with the outer side of the corresponding convex key bar, and the outlet hole of the plug-in tube II is connected to the outlet medium pipe through the outlet hole of the stator core segment II;

[0017] S2. A pressure ring is installed on the outer side of the combined stator core, and the pressure ring is fixed to the housing by a fastening screw. The first hexagonal positioning groove of the pressure ring is engaged with the first hexagonal positioning head, and the second hexagonal positioning groove of the pressure ring is matched with the second hexagonal positioning head. The L-shaped flow hole of the pressure ring connects the medium inlet pipe and the introduction hole of the first hexagonal positioning head to each other.

[0018] S3, the medium inlet pipe and the medium outlet pipe are connected to an external cooling circulation pump through pipelines.

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a water-cooled motor stator core fixing structure, which is mainly composed of a housing, a combined stator core, a pressure ring, a fastening screw, an inlet medium pipe and an outlet medium pipe, wherein the combined stator core includes a stator core segment I, a stator core segment II, a plug-in pipe I and a plug-in pipe II, a plurality of stator core segments I and a stator core segment II are spliced ​​together to form a circle, and the stator core segment II is plugged with the plug-in pipe I and the plug-in pipe II, a plurality of stator core segments I and a stator core segment II are spliced ​​together to form a circle, and the stator core segment II is plugged with the plug-in pipe I and the plug-in pipe II. By adding the plug-in pipe I and the plug-in pipe II to the stator core segment II, a cooling pipeline system is formed by itself and the stator core segment I, the plug-in pipe I and the plug-in pipe II, and the cooling pipeline system includes a multi-layer reciprocating curved pipeline, one end of which is connected to the inlet medium pipe through the pressure ring, and the other end is connected to the outlet medium pipe. The fixing structure of the present invention can meet the fixing and installation requirements of the combined stator core with built-in cooling pipelines, and can improve the heat dissipation performance of the stator core; the fixing structure of the present invention can meet the rapid assembly requirements of the combined stator core, and the assembled structure has high stability.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the above advantages at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a front view schematic diagram of the present invention as a whole;

[0025] Figure 3 It is a structural schematic diagram of the casing in the present invention;

[0026] Figure 4 It is a structural schematic diagram of the combined stator core of the present invention;

[0027] Figure 5 It is a schematic diagram of the main view of the combined stator core of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the stator core segment I in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the stator core segment II in the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the plug-in tube I and the plug-in tube II in the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the plug-in tube I and the plug-in tube II in the present invention;

[0032] Fig.10 It is a schematic diagram of the structure of the pressure ring in the present invention;

[0033] In the accompanying drawings, the components represented by each mark are listed as follows:

[0034] 1- housing, 11- cylindrical housing, 12- flange, 13- shaft hole, 14- inner positioning ring, 15- convex key strip, 16- fastening screw hole;

[0035] 2-combined stator core, 21-stator core segment I, 211-first arc segment, 212-first stator slot, 213-first key slot, 214-first arc pipeline; 22-stator core segment II, 221-second arc segment, 222-second stator slot, 223-second key slot, 224-first plug slot, 225-second plug slot, 226-second arc pipeline, 227-lead-out hole; 23-plug-in tube I, 231-first plug-in tube, 232-first hexagonal positioning head, 233-first guide hole, 234-introduction hole; 24-plug-in tube II, 241-second plug-in tube, 242-second hexagonal positioning head, 243-second guide hole, 244-lead-out hole;

[0036] 3-pressing ring, 31-pressing ring body, 32-third keyway, 33-fastening step hole, 34-first hexagonal positioning groove, 35-second hexagonal positioning groove, 36-L-shaped flow hole;

[0037] 4- Fasten the screw;

[0038] 5- medium inlet pipe;

[0039] 6- medium outlet pipe. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1-Figure 2As shown, this embodiment provides a water-cooled motor stator core fixing structure, including a casing 1, a combined stator core 2, a pressure ring 3, a fastening screw 4, an inlet medium pipe 5 and an outlet medium pipe 6; the combined stator core 2 is placed in the inner cavity of the casing 1, and the casing 1 is equipped with a pressure ring 3 that abuts against the combined stator core 2 through the fastening screw 4, and the outer side of the casing 1 is equipped with an inlet medium pipe 5 and an outlet medium pipe 6, and the inlet medium pipe 5, the outlet medium pipe 6, the pressure ring 3, the built-in cooling pipeline system of the combined stator core 2 and the external cooling circulation pump together constitute a cooling and heat dissipation circuit.

[0042] like Figure 4-Figure 5 As shown, the combined stator core 2 includes a stator core segment I21, a stator core segment II22, a plug-in tube I23 and a plug-in tube II24. Several stator core segments I21 and one stator core segment II22 are spliced ​​together to form a circle, and the plug-in tube I23 and the plug-in tube II24 are plugged and installed in the stator core segment II22.

[0043] like Figure 6 As shown, the stator core segment 121 includes a first arc segment 211, the inner arc surface of the first arc segment 211 is evenly distributed with a plurality of first stator slots 212, the outer arc surface of the first arc segment 211 is provided with a first key groove 213, and the first arc segment 211 is provided with a plurality of first arc pipelines 214 in parallel.

[0044] like Figure 7 As shown, the stator core segment II22 includes a second arc segment 221, the inner arc surface of the second arc segment 221 is evenly distributed with a plurality of second stator slots 222, the outer arc surface of the second arc segment 221 is provided with a second key slot 223, the second arc segment 221 is provided with a first plug-in slot 224 for facilitating the insertion of the plug-in tube I23 and a second plug-in slot 225 for facilitating the insertion of the plug-in tube II24, the second arc segment 221 is provided with two rows of second arc pipelines 226 connected to the first plug-in slot 224 and the second plug-in slot 225 respectively, and the second arc segment 221 is also provided with a lead-out hole 227 that can be connected to the outlet medium pipe 6 after docking.

[0045] like Figure 8-Figure 9 As shown, the plug-in tube 123 is composed of a first plug-in tube 231 and a first hexagonal positioning head 232 which are connected as one body. The outer diameter of the first plug-in tube 231 matches the diameter of the first plug-in slot 224. A plurality of first flow guide holes 233 are arranged side by side on the side of the first plug-in tube 231. Two adjacent first flow guide holes 233 form a group. The first plug-in tube 231 is located between two adjacent groups of first flow guide holes 233 and a blocking block is installed. The first hexagonal positioning block 232 is provided with an inlet hole 234 which is connected to the adjacent first flow guide hole 233 in the first plug-in tube.

[0046] The plug-in tube II24 is composed of a second plug-in tube 241 and a second hexagonal positioning head 242 that are connected as one body. The outer diameter of the second plug-in tube 241 matches the diameter of the second plug-in slot 225. A plurality of second guide holes 243 are arranged side by side on the side of the second plug-in tube 241. Two adjacent second guide holes 243 form a group. A block is installed between the two adjacent groups of second guide holes 243 on the second plug-in tube 241. A lead-out hole 244 that can be connected to the lead-out hole 227 after docking is also arranged on the side of the second plug-in tube 241.

[0047] like Figure 3 As shown, the casing 1 includes a cylindrical shell 11, one side of the cylindrical shell 11 is provided with an opening and a flange 12 is provided at the opening, the other side of the cylindrical shell 11 is provided with an end plate and the center of the end plate is provided with an axial hole 13, the inner cavity of the cylindrical shell 11 is located near the end plate and is provided with an inner positioning ring 14 for limiting the inner position of the combined stator core 2, the inner cavity of the cylindrical shell 11 is circumferentially installed with a plurality of convex key strips 15 that cooperate with the first key groove 213 and the second key groove 223, and the convex key strip 15 is provided with a fastening screw hole 16 that cooperates with the fastening screw 4.

[0048] like Fig.10 As shown, the pressure ring 3 includes a pressure ring body 31, the inner hole diameter of the pressure ring body 31 is equal to the inner hole diameter of the inner positioning ring 14, and the specification of the inner hole diameter enables it to expose the stator winding formed by winding the stator slot part in the combined stator core 2, and the outer periphery of the pressure ring body 31 is provided with a third keyway 32 that cooperates with the convex key bar 15, and the third keyway 32 is provided with a fastening step hole 33 that cooperates with the fastening screw. The pressure ring body 31 is provided with a first hexagonal positioning groove 34, a second hexagonal positioning groove 35 and an L-shaped flow hole 36, the first hexagonal positioning groove 34 cooperates with the first hexagonal positioning head 232, the second hexagonal positioning groove 35 cooperates with the second hexagonal positioning head 233, and the L-shaped flow hole 36 is used to connect the medium inlet pipe 5 and the introduction hole 234 of the first hexagonal positioning head 232.

[0049] In this embodiment, the medium filled in the cooling and heat dissipation circuit is insulating heat-conducting oil. The cooling circulation pump can provide circulation power for the insulating heat-conducting oil, cool the input high-temperature insulating heat-conducting oil, and output low-temperature insulating heat-conducting oil.

[0050] This embodiment also provides a method for fixing a stator core of a water-cooled motor, comprising the following steps:

[0051] S1, splicing the stator core segment I21, the stator core segment II22, the plug-in tube I23 and the plug-in tube II24 into a combined stator core 2, placing the combined stator core 2 in the inner cavity of the housing 1, so that the first keyway 213 of the stator core segment I21 is engaged with the outer side of the corresponding convex key bar 15, the second keyway 214 of the stator core segment II22 is engaged with the outer side of the corresponding convex key bar 15, and the outlet hole of the plug-in tube II23 is connected to the outlet medium pipe 6 through the outlet hole 227 of the stator core segment II22;

[0052] S2. A pressure ring 3 is installed on the outer side of the combined stator core 2, and the pressure ring 3 is fixed to the housing 1 through a fastening screw 4. The first hexagonal positioning groove 34 of the pressure ring 3 is engaged with the first hexagonal positioning head 232, the second hexagonal positioning groove 35 of the pressure ring 3 is matched with the second hexagonal positioning head 242, and the L-shaped flow hole 36 of the pressure ring 3 connects the medium inlet pipe 5 and the introduction hole 234 of the first hexagonal positioning head 232;

[0053] S3, the medium inlet pipe 5 and the medium outlet pipe 6 are connected to an external cooling circulation pump through pipelines.

[0054] A specific application of this embodiment is as follows: this fixed structure is mainly composed of a housing 1, a combined stator core 2, a pressure ring 3, a fastening screw 4, an inlet medium pipe 5 and an outlet medium pipe 6, wherein the combined stator core 2 includes a stator core segment I21, a stator core segment II22, a plug-in pipe I23 and a plug-in pipe II24, a plurality of stator core segments I21 and a stator core segment II22 are spliced ​​together to form a circle, and a plug-in pipe I23 and a plug-in pipe II24 are plugged and installed in the stator core segment II22. By adding a plug-in pipe I23 and a plug-in pipe II24 to the stator core segment II22, a cooling pipe system is formed by itself and the stator core segment I21, the plug-in pipe I23 and the plug-in pipe II24, and the cooling pipe system includes a multi-layer reciprocating curved pipe, one end of which is connected to the inlet medium pipe 5 through the pressure ring 3, and the other end is connected to the outlet medium pipe 6. The fixing structure can meet the fixing and installation requirements of the combined stator core with built-in cooling pipelines, and can improve the heat dissipation performance of the stator core; the fixing structure can meet the rapid assembly requirements of the combined stator core, and the structural stability after assembly is relatively high.

[0055] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A water-cooled motor stator core fixing structure, characterized in that: It includes a casing, a combined stator core, a pressure ring, a fastening screw, an inlet medium pipe and an outlet medium pipe; the combined stator core is placed in the inner cavity of the casing, the casing is equipped with a pressure ring that abuts against the combined stator core through a fastening screw, the outer side of the casing is equipped with an inlet medium pipe and an outlet medium pipe, and the inlet medium pipe, outlet medium pipe, pressure ring, built-in cooling pipeline system of the combined stator core and an external cooling circulation pump together constitute a cooling and heat dissipation circuit.

2. The water-cooled motor stator core fixing structure according to claim 1, characterized in that: The combined stator core comprises a stator core segment I, a stator core segment II, a plug-in tube I and a plug-in tube II. Several stator core segments I and one stator core segment II are spliced ​​together to form a circle. The plug-in tube I and the plug-in tube II are plugged and installed in the stator core segment II.

3. The water-cooled motor stator core fixing structure according to claim 2, characterized in that: The stator core segment I comprises a first arc segment, the inner arc surface of the first arc segment is evenly distributed with a plurality of first stator slots, the outer arc surface of the first arc segment is provided with a first key slot, and the first arc segment is provided with a plurality of first arc pipelines in parallel.

4. The water-cooled motor stator core fixing structure according to claim 3, characterized in that: The stator core segment II includes a second arc segment, the inner arc surface of the second arc segment is evenly distributed with a plurality of second stator slots, the outer arc surface of the second arc segment is provided with a second key slot, the second arc segment is provided with a first plug-in slot for facilitating the insertion of the plug-in tube I and a second plug-in slot for facilitating the insertion of the plug-in tube II, the second arc segment is provided with two rows of second arc pipelines connected to the first plug-in slot and the second plug-in slot in parallel, and the second arc segment is also provided with a lead-out hole that can be connected to the outlet medium pipe after docking.

5. The water-cooled motor stator core fixing structure according to claim 4, characterized in that: The plug-in tube I is composed of a first plug-in tube and a first hexagonal positioning head connected as one body, the outer diameter of the first plug-in tube matches the diameter of the first plug-in slot, a plurality of first flow guide holes are arranged side by side on the side of the first plug-in tube, two adjacent first flow guide holes form a group, the first plug-in tube is provided with a blocking block between two adjacent groups of first flow guide holes, and the first hexagonal positioning block is provided with an inlet hole connected to the adjacent first flow guide hole in the first plug-in tube.

6. The water-cooled motor stator core fixing structure according to claim 5, characterized in that: The plug-in tube II is composed of a second plug-in tube and a second hexagonal positioning head connected as one body, the outer diameter of the second plug-in tube matches the diameter of the second plug-in slot, a plurality of second flow guide holes are arranged side by side on the side of the second plug-in tube, two adjacent second flow guide holes form a group, a block is installed on the second plug-in tube between two adjacent groups of second flow guide holes, and a lead-out hole that can be connected to the lead-out hole after docking is also arranged on the side of the second plug-in tube.

7. The water-cooled motor stator core fixing structure according to claim 6, characterized in that: The casing includes a cylindrical shell, one side of the cylindrical shell is provided with an opening and a flange is provided at the opening, the other side of the cylindrical shell is provided with an end plate and the center of the end plate is provided with an axial hole, the inner cavity of the cylindrical shell is located near the end plate and is provided with an inner positioning ring for limiting the inner position of the combined stator core, the inner cavity of the cylindrical shell is circumferentially installed with a plurality of convex key strips that cooperate with the first key slot and the second key slot, and the convex key strip is provided with a fastening screw hole that cooperates with the fastening screw.

8. The water-cooled motor stator core fixing structure according to claim 7, characterized in that: The pressure ring includes a pressure ring body, the inner hole diameter of the pressure ring body is equal to the inner hole diameter of the inner positioning ring, and the specification of the inner hole diameter enables it to expose the stator winding of the combined stator core, the outer periphery of the pressure ring body is provided with a third keyway matched with the convex key bar, and the third keyway is provided with a fastening step hole matched with the fastening screw, and the pressure ring body is provided with a first hexagonal positioning groove, a second hexagonal positioning groove and an L-shaped flow hole, the first hexagonal positioning groove and the first hexagonal positioning head cooperate with each other, the second hexagonal positioning groove and the second hexagonal positioning head cooperate with each other, and the L-shaped flow hole is used to connect the medium inlet pipe and the introduction hole of the first hexagonal positioning head to each other.

9. The water-cooled motor stator core fixing structure according to claim 8, characterized in that: The medium filled in the cooling and heat dissipation circuit is insulating heat-conducting oil. The cooling circulation pump can provide circulation power for the insulating heat-conducting oil, cool the input high-temperature insulating heat-conducting oil, and output low-temperature insulating heat-conducting oil.

10. A method for fixing a stator core of a water-cooled motor, implemented based on the water-cooled motor stator core fixing structure according to claim 9, characterized in that: The steps include: S1, splicing the stator core segment I, the stator core segment II, the plug-in tube I and the plug-in tube II into a combined stator core, placing the combined stator core in the inner cavity of the housing, so that the first key groove of the stator core segment I is engaged with the outer side of the corresponding convex key bar, the second key groove of the stator core segment II is engaged with the outer side of the corresponding convex key bar, and the outlet hole of the plug-in tube II is connected to the outlet medium pipe through the outlet hole of the stator core segment II; S2. A pressure ring is installed on the outer side of the combined stator core, and the pressure ring is fixed to the housing by a fastening screw. The first hexagonal positioning groove of the pressure ring is engaged with the first hexagonal positioning head, and the second hexagonal positioning groove of the pressure ring is matched with the second hexagonal positioning head. The L-shaped flow hole of the pressure ring connects the medium inlet pipe and the introduction hole of the first hexagonal positioning head to each other. S3, the medium inlet pipe and the medium outlet pipe are connected to an external cooling circulation pump through pipelines.

Images