Energy-saving permanent magnet motor high-efficiency heat dissipation structure

Abstract

This invention relates to a high-efficiency heat dissipation structure for an energy-saving permanent magnet motor, belonging to the field of permanent magnet motor cooling technology. The structure includes a hollow shaft, a stator core, winding coils, a rotor core, permanent magnets, a housing, heat-conducting components, and a water plate. The hollow shaft is coaxially disposed inside the stator core. The housing wraps around the rotor core circumferentially and is fixed to it. Upper and lower end caps at both ends allow the housing to be rotatably mounted to the hollow shaft. The permanent magnets are disposed on the inner wall of the rotor core. The heat-conducting components are in contact with the heat-generating areas of the stator core and winding coils. The water plate is tightly attached to the heat-conducting components. This invention utilizes the excellent thermal conductivity of heat pipes, inserting the heat-absorbing end of the heat pipe into the heat-generating part of the motor, and extending the heat-releasing end radially along the permanent magnet motor to the air region of the hollow shaft. The heat is efficiently transferred to the outside of the motor through the tightly attached water plate, resulting in high heat dissipation efficiency and effectively solving the problem of excessive temperature rise in permanent magnet motors.

Description

Technical Field

[0001] This invention belongs to the field of permanent magnet motor cooling technology, specifically relating to a high-efficiency heat dissipation structure for an energy-saving permanent magnet motor. Background Technology

[0002] With the increasing global energy supply and demand imbalance, energy conservation and emission reduction have become the core direction of industry transformation. Energy-saving motors, as highly efficient energy-saving equipment, are widely used. However, during high-speed and high-load operation, their internal windings, iron cores, and other core components continuously generate heat. If this heat cannot be dissipated in time, it will lead to excessive motor temperature rise, weakening energy-saving advantages, accelerating component aging, and even causing failures. Existing hydraulic cooling components for motors are mostly general structures adapted to ordinary industrial motors, such as sleeve-type, sandwich-type, and embedded water pipe structures. They are not designed specifically for the miniaturization and lightweight characteristics of energy-saving motors, making direct promotion and application difficult. Some energy-saving motors that attempt to use hydraulic cooling have obvious defects in their simple hydraulic cooling plates: unreasonable flow channel layout, insufficient fit with heat-generating components, and easy formation of water flow dead zones; improper flow channel design leads to high coolant resistance, requiring a high-power circulating pump and increasing system energy consumption; the water plate structure is heavy, conflicting with the miniaturization trend of energy-saving motors, resulting in poor installation compatibility and difficult maintenance; and insufficient compatibility between materials and sealing structures, leading to aging and failure after long-term use, reducing heat dissipation reliability. To address the aforementioned issues, existing improvements only provide localized optimization for individual defects, failing to achieve comprehensive optimization based on the needs of promoting energy-efficient motors and thus unable to resolve compatibility issues. Therefore, developing a hydraulic cooling plate specifically designed for energy-efficient motors is crucial for overcoming heat dissipation bottlenecks and promoting the widespread application of energy-efficient motors. Consequently, there is an urgent need to propose a highly efficient heat dissipation structure for energy-efficient permanent magnet motors. Summary of the Invention

[0003] Purpose of the invention To overcome the shortcomings of existing technologies, an efficient heat dissipation structure for an energy-saving permanent magnet motor is provided, which solves problems such as increased flow density of heat generated inside the permanent magnet motor and excessive motor temperature rise.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency heat dissipation structure for an energy-saving permanent magnet motor includes a hollow shaft, a stator core, winding coils, a rotor core, permanent magnets, a housing, a heat-conducting component, and a water plate. The stator core has mounting grooves, and the winding coils are embedded in the winding slots of the stator core. The hollow shaft is coaxially fixedly mounted on the inner side of the stator core. The housing wraps around the circumference of the rotor core and is fixedly connected to the outer side of the rotor core. The housing has an upper end cover and a lower end cover at both ends, and the housing is rotatably mounted on the hollow shaft through the upper and lower end covers. The permanent magnets are disposed on the inner sidewall of the rotor core. The heat-conducting component is fitted to the heat-generating areas of the stator core and winding coils, and the water plate is tightly fitted to the heat-conducting component.

[0005] As a further description of the above solution, the heat-conducting component includes an upper heat-conducting component and a lower heat-conducting component, both of which are composed of multiple flat heat pipes arranged circumferentially along the stator core.

[0006] As a further description of the above scheme, the permanent magnet is fixed to the inner wall of the rotor core by adhesive bonding, and the flat heat pipe is made of aluminum nitride material.

[0007] As a further description of the above solution, the hollow shaft includes an upper section, a middle section, and a lower section. The lower end of the upper section and the upper end of the lower section are provided with the mounting groove. The upper and lower ends of the middle section are provided with mounting protrusions that are adapted to the mounting groove. The upper section, middle section, and lower section are spliced ​​and fixed by the cooperation of the mounting groove and the mounting protrusion.

[0008] As a further description of the above solution, the water plate includes water plate a, water plate b, upper cover of the water plate, lower cover of the water plate, fixing piece a, and fixing piece b; both water plate a and water plate b have annular water channels inside, and both water plate a and water plate b are coaxially fixedly sleeved on the outer wall of the hollow shaft. Both water plate a and water plate b are provided with multiple connecting protrusions, and the inner sides of the upper cover and lower cover of the water plate are provided with grooves that are adapted to the connecting protrusions. The water plate a and the water plate cover are positioned by matching the connecting protrusion and the groove, and the water plate a and the water plate cover are fixedly connected to the fixing piece a by bolts; The water plate b and the lower cover of the water plate are positioned by means of a connecting protrusion and a groove, and the water plate b and the lower cover of the water plate are fixedly connected to the fixing piece b by bolts.

[0009] As a further description of the above scheme, the width of the flat heat pipe is 4-6 mm and the thickness is 2-3 mm.

[0010] As a further description of the above solution, the joints of the upper section, middle section and lower section of the hollow shaft are fixed by an interference fit between the mounting groove and the mounting protrusion.

[0011] As a further description of the above scheme, each of the flat heat pipes has a heat absorption end and a heat release end. The upper and lower axial parts of the middle section of the hollow shaft are respectively provided with a ring of heat pipe mounting holes along the circumference. Each ring of heat pipe mounting holes is evenly spaced along the circumference of the middle section of the hollow shaft. The flat heat pipe passes through the heat pipe mounting hole along the stator core teeth. After the heat absorption end passes through the heat pipe mounting hole, it is attached to the end of the winding coil and the yoke of the stator core. The heat release end extends radially along the stator core to the hollow area inside the hollow shaft. The winding coil is wound around the stator core teeth and covers the outside of the flat heat pipe after it is installed.

[0012] As a further description of the above solution, the upper heat-conducting component is located on the side near the upper end cover, and the water plate a is attached to the side of the upper heat-conducting component near the upper end cover; the lower heat-conducting component is located on the side near the lower end cover, and the water plate b is attached to the side of the lower heat-conducting component near the lower end cover.

[0013] As a further description of the above solution, a bearing a is provided between the upper end cover and the upper section of the hollow shaft, and a bearing b is provided between the lower end cover and the middle section of the hollow shaft. The housing and the hollow shaft achieve relative rotation through bearings a and b. Advantages and effects of the present invention: 1. This invention fully utilizes the excellent thermal conductivity of heat pipes. The heat-absorbing end of the heat pipe is inserted into the heat-generating part of the motor, and the heat-releasing end extends radially along the permanent magnet motor to the air region of the motor's hollow shaft. A water plate is placed in close contact with it, enabling efficient heat transfer to the external space of the permanent magnet motor. The proposed structure effectively improves heat dissipation efficiency and is of great significance for the analysis of cooling systems and heat dissipation in permanent magnet motors.

[0014] 2. To improve cooling and heat dissipation, a targeted cooling structure design is implemented for the main heat sources of the motor. Multiple heat pipes are connected to the winding ends, which can effectively remove copper losses from the windings. The number of heat pipes corresponds to the number of winding coils. To increase the contact area between the heat pipes and the windings, the heat pipes adopt a flat structure.

[0015] 3. The permanent magnet of the present invention can be directly surface-mounted, the installation process is simple and easy to implement, the rotor yoke is thin, which helps to reduce the weight of the rotor core and further improve the power density of the motor.

[0016] 4. Considering the heat pipe assembly issue, this invention employs a segmented hollow shaft design, dividing the hollow shaft into upper, middle, and lower sections. Each section is equipped with an assembly groove and a connecting protrusion, facilitating the connection and stability of the heat pipe. Simultaneously, the segmented hollow shaft design reduces the overall length of the hollow shaft, lowers the overall weight of the motor, and improves the motor's operating efficiency and reliability. Furthermore, the design of the assembly groove and connecting protrusion increases the strength and rigidity of the hollow shaft, enhancing the motor's operational stability and lifespan.

[0017] 5. To improve the cooling effect, water plates are provided on the upper and lower sides of the heat pipe. The water plates have annular water channels and protrusions between adjacent water channels. The water plate cover has grooves corresponding to the protrusions of the water plates. Threaded holes are provided at both the protrusions of the water plates and the grooves of the water plate cover. After the water plates and the water plate cover are installed and fixed, they are fixed with fixing plates to make them fit tightly against the heat pipe. The fixing plates are provided with threaded holes. Attached Figure Description

[0018] Figure 1 This is a front view of the assembled machine according to an example of the present invention; Figure 2 This is a rear view of the assembled machine according to an example of the present invention; Figure 3 This is a three-dimensional exploded view of the entire machine according to an example of the present invention; Figure 4 This is a schematic diagram of the installation structure of the rotor core, permanent magnet, winding coil, heat pipe and bearing in an example of the present invention. Figure 5 This is a schematic diagram of the installation of the winding coil, stator core, heat pipe and bearing in an example of the present invention; Figure 6 This is a schematic diagram of the installation of the rotor core and permanent magnet in an example of the present invention; Figure 7 for Figure 4 Cross-sectional view; Figure 8 This is a schematic diagram of the water plate and the entire machine installation in an embodiment of the present invention; Figure 9 This is a schematic diagram of the internal water channels of water plate a in an embodiment of the present invention; Figure 10 This is a schematic diagram of the water plate cover in an embodiment of the present invention; Figure 11 This is a schematic diagram of the installation of the fixing piece b, the water plate cover, and the water plate b in an embodiment of the present invention. Figure 12 This is a schematic diagram of the installation of the fixing piece a, the water plate cover, and the water plate a in an embodiment of the present invention; Figure 13 This is a schematic diagram of the bottom of water plate a in an embodiment of the present invention; Figure 14This is a schematic diagram of the bottom of water plate b in an embodiment of the present invention; Figure 15 This is a cross-sectional view of the entire machine according to an example of the present invention; Figure 16 This is a schematic diagram of the upper section of the hollow shaft in an example of the present invention; Figure 17 This is a schematic diagram of a flange according to an example of the present invention; Figure 18 This is a schematic diagram of the overall water plate of an embodiment of the present invention; Figure 19 This is a schematic diagram of the bearing and the entire machine installation in an example of the present invention; Figure 20 This is a schematic diagram of the middle section of the hollow shaft in an example of the present invention; Figure 21 This is a schematic diagram of the heat pipe's heat absorption end and heat release end in an embodiment of the present invention; Figure 22 This is a schematic diagram of the stator core of an embodiment of the present invention; Figure 23 This is a schematic diagram of the rotor core of an example of the present invention.

[0019] The attached diagram lists the components represented by each number as follows: 1-Connecting groove, 2-Flange, 3-Bearing a, 4-Lower section of hollow shaft, 5-Middle section of hollow shaft, 6-Flat heat pipe, 7-Winding coil, 8-Stator core, 9-Permanent magnet, 10-Rotor core, 11-Lower end cover, 12-Housing, 13-Upper end cover, 14-Upper section of hollow shaft, 15-Heat dissipation end, 16-Fixing plate a, 17-Water plate cover, 18-Threaded hole of upper cover, 19-Water plate a, 20-Fixing plate b, 21-Water plate b, 22-Three-phase line reserved hole, 23-Threaded hole of flange, 24-Water inlet, 25-Water outlet, 26-Shaft sleeve a, 27-Bearing b, 28-Shaft sleeve b, 29-Heat absorption end, 30-Rotor core limiting groove, 31-Heat pipe mounting hole. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A high-efficiency heat dissipation structure for an energy-saving permanent magnet motor includes a hollow shaft, a stator core 8, winding coils 7, a rotor core 10, a permanent magnet 9, a housing 12, a heat-conducting component, and a water plate. The stator core 8 has mounting grooves, and the winding coils 7 are embedded in the winding slots of the stator core 8. The hollow shaft is coaxially fixedly disposed on the inner side of the stator core 8. The housing 12 is circumferentially wrapped around the rotor core 10 and fixedly connected to the outer side of the rotor core 10. The two ends of the housing 12 are respectively provided with an upper end cover 13 and a lower end cover 11. The housing 12 is rotatably mounted on the hollow shaft through the upper end cover 13 and the lower end cover 11. The permanent magnet 9 is disposed on the inner side wall of the rotor core 10. The heat-conducting component is attached to the heat-generating areas of the stator core 8 and the winding coils 7, and the water plate is tightly attached to the heat-conducting component.

[0022] The heat-conducting component of the present invention includes an upper heat-conducting component and a lower heat-conducting component, both of which are formed by multiple flat heat pipes 6 arranged circumferentially along the stator core 8.

[0023] The permanent magnet 9 of this invention is fixed to the inner wall of the rotor core 10 by adhesive bonding, and the flat heat pipe 6 is made of aluminum nitride. The surface-mount structure of the permanent magnet 9 in this application has a simple and easy installation process, and the rotor yoke is thin, which helps to reduce the weight of the rotor core and further improve the power density of the motor.

[0024] The hollow shaft of the present invention includes an upper hollow shaft section 14, a middle hollow shaft section 5, and a lower hollow shaft section 4. The lower end of the upper hollow shaft section 14 and the upper end of the lower hollow shaft section 4 are provided with mounting grooves. The upper and lower ends of the middle hollow shaft section 5 are provided with mounting protrusions that are adapted to the mounting grooves. The upper hollow shaft section 14, the middle hollow shaft section 5, and the lower hollow shaft section 4 are spliced ​​and fixed by the cooperation of the mounting grooves and the mounting protrusions.

[0025] To address the heat pipe assembly issue, this invention employs a segmented hollow shaft design, dividing the hollow shaft into upper, middle, and lower sections. Each section features an assembly groove and a connecting protrusion, facilitating easier and more stable heat pipe connection. Simultaneously, the segmented hollow shaft design reduces its overall length, lowers the overall weight of the motor, and improves its operating efficiency and reliability. Furthermore, the design of the assembly groove and connecting protrusion increases the strength and rigidity of the hollow shaft, enhancing the motor's operational stability and lifespan.

[0026] The water plate of the present invention includes a water plate a19, a water plate b21, a water plate upper cover 17, a water plate lower cover, a fixing piece a16, and a fixing piece b20; wherein both water plate a and water plate b have annular water channels inside, and water plate a19 and water plate b21 are coaxially fixedly sleeved on the outer wall of a hollow shaft; both water plate a19 and water plate b21 are provided with multiple connecting protrusions, and the inner sides of water plate upper cover 17 and water plate lower cover are provided with grooves that are adapted to the connecting protrusions; water plate a19 and water plate upper cover 17 are positioned by the matching of connecting protrusions and grooves, and water plate a19 and water plate upper cover 17 are fixedly connected to fixing piece a16 by bolts; water plate b21 and water plate lower cover are positioned by the matching of connecting protrusions and grooves, and water plate b21 and water plate lower cover are fixedly connected to fixing piece b20 by bolts. To improve the cooling effect, water plates are provided on the upper and lower sides of the lower heat conduction component. The water plates have annular water channels and protrusions between adjacent water channels. The water plate cover 17 has grooves corresponding to the water plate protrusions. Threaded holes are provided at both the water plate protrusions and the grooves of the water plate cover 17. After the water plates and water plate covers are installed and fixed, they are fixed with fixing plates to make them fit tightly against the heat pipe. The fixing plates are provided with threaded holes.

[0027] The flat heat pipe 6 of the present invention has a width of 4-6 mm and a thickness of 2-3 mm.

[0028] The joints of the upper section 14, the middle section 5, and the lower section 4 of the hollow shaft of the present invention are fixed by an interference fit between the mounting groove and the mounting protrusion.

[0029] To achieve better cooling and heat dissipation, a targeted cooling structure design is implemented for the main heat sources of the motor. One end of a heat pipe is inserted into the yoke of the stator core of the permanent magnet motor, which can effectively remove the iron loss of the stator core. The number of heat pipes corresponds to the number of stator slots. To reduce the thickness of the stator core yoke, the heat pipes adopt a flat structure. The winding ends are connected to multiple heat pipes, which can effectively remove the copper loss of the winding. The number of heat pipes corresponds to the number of winding coils. To increase the contact area between the heat pipes and the windings, the heat pipes adopt a flat structure.

[0030] In this invention, each flat heat pipe 6 has a heat-absorbing end 29 and a heat-releasing end 15. A ring of heat pipe mounting holes 31 is opened circumferentially on the upper and lower axial parts of the hollow shaft middle section 5. Each ring of heat pipe mounting holes 31 is evenly spaced circumferentially along the hollow shaft middle section 5. The circumferential angle between two adjacent heat pipe mounting holes 31 is 10°. The flat heat pipe 6 is inserted into the heat pipe mounting hole 31 along the teeth of the stator core 8. After the heat-absorbing end 29 passes through the heat pipe mounting hole 31, the heat-absorbing end 29 is attached to the end of the winding coil 7 and the yoke of the stator core 8. The heat-releasing end 15 extends radially along the stator core 8 to the hollow area inside the hollow shaft. The winding coil 7 is wound around the teeth of the stator core 8 and covers the outside of the flat heat pipe 6 after insertion.

[0031] This application's structure fully utilizes the excellent thermal conductivity of heat pipes. The heat-absorbing end of the heat pipe is inserted into the heat-generating part of the motor, while the heat-releasing end extends radially along the permanent magnet motor to the air region of the motor's hollow shaft. A water plate is placed in close contact with this air region, enabling efficient heat transfer to the external space of the permanent magnet motor. The proposed structure effectively improves heat dissipation efficiency and is of great significance for the analysis of cooling systems and heat dissipation in permanent magnet motors.

[0032] The upper heat-conducting component of the present invention is located on the side near the upper end cover 13, and the water plate a19 is attached to the side of the upper heat-conducting component near the upper end cover 13; the lower heat-conducting component is located on the side near the lower end cover 11, and the water plate b21 is attached to the side of the lower heat-conducting component near the lower end cover 11.

[0033] The present invention has a bearing a3 between the upper end cover 13 and the upper section 14 of the hollow shaft, and a bearing b27 between the lower end cover 11 and the middle section 5 of the hollow shaft. The housing 12 and the hollow shaft can rotate relative to each other through the bearing a3 and the bearing b27.

[0034] Both the upper cover 17 and the lower cover of the water plate in this invention are provided with inlets 24 and outlets 25. The inlets 24 and outlets 25 are respectively connected to the annular water channels inside the water plate a19 and water plate b21. The inlet 24 is connected to the supply end of the external coolant circulation pipe, and the outlet 25 is connected to the return end of the external coolant circulation pipe. After entering the annular water channel through the inlet 24, the coolant flows evenly along the circumference of the annular water channel, fully absorbing the internal heat transferred by the flat heat pipe 6, and then flows out through the outlet 25 to the external circulation pipe, completing the closed-loop cooling process. The annular water channel adopts a uniform cross-section gradually changing flow channel design, which can effectively avoid dead zones in the water flow, reduce coolant flow resistance, eliminate the need for a high-power circulation pump, and match the low-energy consumption design requirements of energy-saving motors. The annular water channels of water plate a19 and water plate b21 can be connected in series through the connecting flow channel inside the hollow shaft, sharing a set of inlet 24 and outlet 25; or they can be set with independent inlet 24 and outlet 25 respectively, so as to achieve independent temperature control at the top and bottom, and adapt to the heat dissipation requirements of different working conditions.

[0035] Specifically, the present invention first assembles the hollow shaft middle section with the stator core 8, then assembles the water plate, and the flat heat pipe 6 extends along the teeth of the stator core 8 into the groove of the water plate. Then, the winding coil 7 is wound, and the permanent magnet 9 is installed into the rotor core 10. The permanent magnet 9 and the rotor core 10 are assembled with a housing. The flange 2 and the lower end cover 11 are fixed with bolts to the lower end of the hollow shaft middle section 5, and fixed between the lower section 4 of the hollow shaft and the lower end cover 11. The flange 4 is fixed to the lower end cover 11 with bolts. The upper section 14 of the hollow shaft is assembled, and the bearing a3 is fixed to the upper section 14 of the hollow shaft and the upper end cover 13. The upper, middle and lower sections of the hollow shaft are connected by a tenon and mortise structure.

[0036] The connecting groove 1 is used to connect with external equipment of the motor and realize power transmission. The flange 2 is fixed on the lower end cover 11 through the flange thread hole 23. The bushing a26 is set above the bearing a3 and located outside the upper section 14 of the hollow shaft. The bushing b28 is set below the bearing b27 and located outside the lower section 4 of the hollow shaft. The permanent magnet 9 is embedded in the rotor core limiting groove 30 of the rotor core 10.

[0037] Three-phase wire reserved hole 22 is used for the three-phase lead wires of the winding coil to pass through.

[0038] The flange 2 has a threaded hole 23, which is provided on the flange 2 and is used to fix the flange 2 in place by engaging with the corresponding component through a threaded fastener. The assembly steps of the energy-saving permanent magnet motor's high-efficiency heat dissipation structure of the present invention are as follows: Stator assembly reference pre-assembly: The stator core 8 is coaxially fixedly assembled on the outside of the hollow shaft middle section 5, completing the pre-assembly and fixing of the hollow shaft middle section 5 and the stator core 8, forming the stator assembly reference; Pre-assembly and positioning of the water plate assembly: Position the water plate b21 and the lower water plate cover by connecting protrusions and grooves, and lock the water plate b21, the lower water plate cover, and the fixing piece b20 with bolts to complete the pre-assembly of the lower water plate assembly; Coaxially fix the pre-assembled lower water plate assembly to the lower part of the hollow shaft, so that it is located on the lower side of the stator core 8; Position the water plate a19 and the upper water plate cover 17 by connecting protrusions and grooves, and lock the water plate a19, the upper water plate cover 17, and the fixing piece a16 with bolts to complete the pre-assembly of the upper water plate assembly; Coaxially fix the pre-assembled upper water plate assembly to the upper part of the hollow shaft, so that it is located on the upper side of the stator core 8; Heat pipe insertion and positioning: Take multiple flat heat pipes 6 and insert them into the heat pipe mounting holes 31 at the corresponding positions of the hollow shaft middle section 5 along the teeth of the stator core 8; after insertion, the heat-absorbing end 29 of the flat heat pipe extends out of the heat pipe mounting hole 31 and fits tightly against the end area corresponding to the preset installation position of the winding coil 7 and the yoke surface of the stator core 8; the heat-dissipating end 15 of the flat heat pipe extends radially along the stator core 8 to the hollow area inside the hollow shaft middle section 5, while the axial end face of the flat heat pipe 6 is in close contact with the contact surfaces of the water plate a19 and water plate b21 on the corresponding side; Winding and fixing: The winding coil 7 is wound on the teeth of the stator core 8. After the winding is completed, the end of the winding coil 7 is tightly attached and fixed to the heat absorption end 29 of the flat heat pipe, thus completing the overall assembly of the stator assembly. Rotor and housing assembly pre-assembly: The permanent magnet 9 is fixed to the rotor core limiting groove 30 on the inner side wall of the rotor core 10 by adhesive bonding, and then the rotor core 10 is coaxially fixed to the inner side wall of the housing 12 to complete the pre-assembly of the rotor and housing assembly. Stator and rotor assembly and lower end component assembly: The pre-assembled rotor and housing assembly are coaxially sleeved on the outside of the stator assembly, so that a uniform air gap is formed between the permanent magnet 9 and the outer circular surface of the stator core 8; the bearing b27 is coaxially assembled at the lower end journal of the hollow shaft middle section 5, and then the lower end cover 11 is coaxially assembled at the lower end of the housing 12, so that the bearing chamber of the lower end cover 11 and the outer ring of the bearing b27 are fitted and fixed; the lower section 4 of the hollow shaft is spliced ​​and fixed by interference fit with the mounting groove at the end and the mounting protrusion at the lower end of the hollow shaft middle section 5, so as to axially limit the bearing b27; the flange 2 is locked and fixed to the lower end cover 11 by bolts through the flange thread hole 23. Assembly and fixing of upper components: The bearing a3 is coaxially assembled to the lower journal of the upper section 14 of the hollow shaft. The upper section 14 of the hollow shaft is spliced ​​and fixed by interference fit between the mounting groove at the end and the mounting protrusion at the upper end of the middle section 5 of the hollow shaft, thus completing the overall splicing of the three sections of the hollow shaft. The upper end cover 13 is coaxially assembled to the upper end of the housing 12, so that the bearing chamber of the upper end cover 13 is fitted and fixed with the outer ring of the bearing a3, thus completing the assembly of the whole machine.

[0039] The above are merely a few embodiments of this application and are not intended to limit this application in any way. Although this application discloses preferred embodiments as described above, they are not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A high-efficiency heat dissipation structure for an energy-saving permanent magnet motor, characterized in that, The system includes a hollow shaft, a stator core (8), winding coils (7), a rotor core (10), a permanent magnet (9), a housing (12), a heat-conducting assembly, and a water plate. The stator core (8) has mounting grooves, and the winding coils (7) are embedded in the winding slots of the stator core (8). The hollow shaft is coaxially fixed inside the stator core (8). The housing (12) wraps around the rotor core (10) circumferentially and is connected to the rotor core (9). The outer side of the housing (10) is fixedly connected. The two ends of the housing (12) are respectively provided with an upper end cover (13) and a lower end cover (11). The housing (12) is rotatably mounted on the hollow shaft through the upper end cover (13) and the lower end cover (11). The permanent magnet (9) is set on the inner side wall of the rotor core (10). The heat-conducting component is attached to the heating area of ​​the stator core (8) and the winding coil (7). The water plate is tightly attached to the heat-conducting component.

2. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 1, characterized in that, The heat-conducting components include an upper heat-conducting component and a lower heat-conducting component, both of which are composed of multiple flat heat pipes (6) arranged circumferentially along the stator core (8).

3. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 2, characterized in that, The permanent magnet (9) is fixed to the inner wall of the rotor core (10) by adhesive bonding, and the flat heat pipe (6) is made of aluminum nitride material.

4. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 1 or 2, characterized in that, The hollow shaft includes an upper section (14), a middle section (5), and a lower section (4). The lower end of the upper section (14) and the upper end of the lower section (4) are provided with the mounting groove. The upper and lower ends of the middle section (5) are provided with mounting protrusions that are adapted to the mounting groove. The upper section (14), the middle section (5), and the lower section (4) are fixed by the fitting of the mounting groove and the mounting protrusion.

5. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 2, characterized in that, The water plate includes water plate a (19), water plate b (21), upper cover of water plate (17), lower cover of water plate, fixing piece a (16) and fixing piece b (20); both water plate a (19) and water plate b (21) have annular water channels inside, and both water plate a (19) and water plate b (21) are coaxially fixedly sleeved on the outer wall of the hollow shaft; Both water plate a (19) and water plate b (21) are provided with multiple connecting protrusions, and the inner sides of the upper cover (17) and lower cover of the water plate are provided with grooves that are adapted to the connecting protrusions. The water plate a (19) and the water plate cover (17) are positioned by matching the connecting protrusion and the groove, and the water plate a (19) and the water plate cover (17) are fixedly connected to the fixing piece a (16) by bolts; The water plate b (21) and the water plate cover are positioned by connecting protrusions and grooves, and the water plate b (21) and the water plate cover are fixedly connected to the fixing piece b (20) by bolts.

6. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 2, characterized in that, The flat heat pipe (6) has a width of 4-6 mm and a thickness of 2-3 mm.

7. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 4, characterized in that, The joints of the upper section (14), middle section (5), and lower section (4) of the hollow shaft are fixed by an interference fit between the mounting groove and the mounting protrusion.

8. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 4, characterized in that, Each of the flat heat pipes (6) has a heat-absorbing end (29) and a heat-releasing end (15). The upper and lower axial parts of the hollow shaft middle section (5) are respectively provided with a ring of heat pipe mounting holes (31) along the circumference. Each ring of heat pipe mounting holes (31) is evenly spaced along the circumference of the hollow shaft middle section (5). The flat heat pipe (6) passes through the heat pipe mounting hole (31) along the teeth of the stator core (8). After the heat-absorbing end (29) passes through the heat pipe mounting hole (31), it is attached to the end of the winding coil (7) and the yoke of the stator core (8). The heat-releasing end (15) extends radially along the stator core (8) to the hollow area inside the hollow shaft. The winding coil (7) is wound around the teeth of the stator core (8), and the winding coil (7) covers the outside of the flat heat pipe (6) after it is installed.

9. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 5, characterized in that, The upper heat-conducting component is located on the side near the upper end cover (13), and the water plate a (19) is attached to the side of the upper heat-conducting component near the upper end cover (13); the lower heat-conducting component is located on the side near the lower end cover (11), and the water plate b (21) is attached to the side of the lower heat-conducting component near the lower end cover (11).

10. The high-efficiency heat dissipation structure of the energy-saving permanent magnet motor according to claim 4, characterized in that, A bearing a (3) is provided between the upper end cover (13) and the upper section (14) of the hollow shaft, and a bearing b (27) is provided between the lower end cover (11) and the middle section (5) of the hollow shaft. The housing (12) and the hollow shaft can rotate relative to each other through the bearing a (3) and the bearing b (27).

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