Energy-saving motor structure

Abstract

The invention relates to the technical field of motors, in particular to an energy-saving motor structure which comprises a base, a central shaft, a rotor and a stator, the central shaft, the rotor and the stator are mounted in the base, two ends of the base are detachably connected with a front end cover and a rear end cover respectively, and bearings are mounted in the middles of the front end cover and the rear end cover. A fan cover is detachably arranged at the end, close to the rear end cover, of the machine base, a hollow inner cavity is formed in the center shaft, an axial heat dissipation outlet is formed in the end, close to the rear end cover, of the center shaft, a gap is reserved between the inner ring of the rotor and the peripheral face of the center shaft, and radial heat dissipation holes are evenly distributed in the position, corresponding to the gap, of the middle section of the center shaft in the circumferential direction. The radial heat dissipation holes are communicated with the hollow inner cavity of the center shaft and the gap, and the hollow inner cavity is formed in the center shaft and matched with the axial heat dissipation outlet close to the rear end cover and the radial heat dissipation holes evenly distributed in the circumferential direction of the middle section of the center shaft, so that rapid heat dissipation is directly conducted on the heat accumulation area of the center shaft and the rotor.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, specifically to an energy-saving electric motor structure. Background Technology

[0002] As a core power device that converts electrical energy into mechanical energy, electric motors are widely used in many fields such as industrial production and household appliances. Their operating efficiency and energy-saving performance directly affect energy consumption and usage costs. During the operation of an electric motor, the electromagnetic induction between the stator and rotor generates a large amount of heat. Therefore, a heat dissipation structure is designed inside the electric motor to dissipate heat.

[0003] For example, Chinese Patent Publication No. CN219329674U discloses a motor with heat dissipation function, including a rotor assembly, a stator assembly, and a housing. A cavity is formed inside the housing, and the rotor assembly and stator assembly are placed in the cavity. The stator assembly includes a stator core, end insulation, and coil windings. The end insulation is installed at both ends of the stator core, and then the coil windings are wound around it. An insulating heat-conducting accessory is provided in the cavity. One end of the insulating heat-conducting accessory is in contact with the surface of the coil windings, and the other end of the insulating heat-conducting accessory is in contact with the housing. The insulating heat-conducting accessory directly conducts the heat of the coil windings to the housing, thereby accelerating heat dissipation. By using the insulating heat-conducting accessory as an intermediate medium to directly transfer the heat of the coil windings to the housing, the heat dissipation of the coil windings can be accelerated, making the overall structure of the motor simpler. The size of the insulating heat-conducting accessory can be determined according to the size of the motor. It can ensure the heat dissipation speed of the coil windings without changing the size of the motor, thereby reducing the difficulty of the process, the cost, and improving the production efficiency.

[0004] However, during the operation of the motor, some of the heat is concentrated in the mating area between the rotor and the central shaft. Since this area is tightly wrapped by the stator, forming a closed space, air circulation is severely obstructed. The heat cannot be dissipated quickly through natural convection and can only be transferred to the frame through the thermal conduction of the rotor core. Then, passive heat dissipation is achieved through the heat dissipation fins on the outer periphery of the frame. Moreover, the heat dissipation of the above motor mainly acts on the open space inside the frame, and the heat dissipation effect is limited. Summary of the Invention

[0005] To address the aforementioned issues, an energy-saving motor structure is provided. By setting a hollow inner cavity in the central shaft, combined with an axial heat dissipation outlet near the rear end cover and radially distributed heat dissipation holes in the middle section of the central shaft, the heat accumulation areas of the central shaft and rotor can be rapidly dissipated directly.

[0006] To address the problems of existing technologies, this invention provides an energy-saving motor structure, including a frame and a central shaft, rotor, and stator installed within the frame. The rotor is mounted on the central shaft, and the stator is sleeved on the outside of the rotor. A front cover and a rear cover are detachably connected to both ends of the frame, respectively. Bearings are installed in the middle of both the front and rear covers. Both ends of the central shaft are rotatably connected to the bearings on their respective sides. A fan cover is detachably installed at the end of the frame near the rear cover. The central shaft has a hollow inner cavity. The end of the central shaft near the front cover is closed, and the end of the central shaft near the rear cover forms an axial heat dissipation outlet. A gap is left between the inner ring of the rotor and the outer circumferential surface of the central shaft. Radial heat dissipation holes are evenly distributed circumferentially in the middle section of the central shaft corresponding to the gap. The radial heat dissipation holes connect the hollow inner cavity of the central shaft and the gap.

[0007] Preferably, the central shaft is composed of a front section and a rear section coaxially spliced ​​together. The front section and the rear section are detachably connected by a key connection structure. The front section has a first exhaust channel inside, and the rear section has a second exhaust channel inside. The first exhaust channel and the second exhaust channel are connected and together form the hollow inner cavity of the central shaft.

[0008] Preferably, the key connection structure includes a first external spline on the end face of the rear section near the front section, and a first internal spline groove on the inner wall of the front section near the rear section that is adapted to the first external spline, wherein the first external spline and the first internal spline groove are fitted together.

[0009] Preferably, a plurality of reinforcing plates are arranged at intervals along the axial direction in the first exhaust duct of the front section, and each reinforcing plate divides the first exhaust duct into a plurality of independent exhaust channels, and each independent exhaust channel is connected to a corresponding radial heat dissipation hole.

[0010] Preferably, the end of the rear section away from the front section has a flared structure, which constitutes the axial heat dissipation outlet of the central shaft.

[0011] Preferably, a conical guide plate is fixedly provided in the middle of the axial heat dissipation outlet of the rear section. The conical guide plate and the inner wall of the axial heat dissipation outlet form an annular exhaust channel. A plurality of first heat dissipation fan blades are provided in the annular exhaust channel, which are equidistantly distributed along the circumference of the conical guide plate. The two ends of each first heat dissipation fan blade are fixedly connected to the outer peripheral wall of the conical guide plate and the inner peripheral wall of the rear section, respectively.

[0012] Preferably, a collar is fitted on the outer peripheral surface of the rear section, and a plurality of second heat dissipation fan blades are provided on the outer peripheral wall of the collar, which are equidistantly distributed along its circumference.

[0013] Preferably, the inner peripheral wall of the collar is provided with a second inner spline groove, and the outer peripheral surface of the rear section is provided with a second outer spline that is adapted to the second inner spline groove, and the second outer spline and the second inner spline groove are fitted together.

[0014] Preferably, the diameter of the radial heat dissipation hole gradually increases from one side of the outer circumferential surface of the central shaft towards the exhaust channel side.

[0015] Preferably, both the first and second heat dissipation fan blades are arc-shaped blades, and the bending direction of the arc-shaped blades is consistent with the rotation direction of the central axis.

[0016] The advantages of this invention compared to the prior art are:

[0017] 1. This invention provides rapid heat dissipation directly to the heat accumulation areas of the central shaft and rotor by setting a hollow inner cavity in the central shaft, combined with an axial heat dissipation outlet near the rear end cover and radial heat dissipation holes evenly distributed circumferentially in the middle section of the central shaft.

[0018] 2. The present invention designs the central shaft as a split structure in which the front section and the rear section are coaxially spliced ​​together. The two sections are detachable and fixed by a key connection structure, which makes the maintenance of the central shaft more convenient. The corresponding sections can be disassembled and replaced separately without replacing the entire central shaft, which greatly reduces the later maintenance cost.

[0019] 3. The present invention sets the end of the rear section away from the front section as a trumpet-shaped flared structure and serves as an axial heat dissipation outlet. Combined with the conical guide plate, annular exhaust channel and circumferentially distributed first heat dissipation fan blades inside the flared section, it effectively increases the exhaust cross-sectional area, reduces the airflow resistance when hot air is discharged from the hollow inner cavity of the central shaft, accelerates the discharge speed of hot air, and at the same time avoids the formation of vortices and backflow of hot air at the outlet. Attached Figure Description

[0020] Figure 1 This is a partial cross-sectional view of an energy-saving electric motor structure according to the present invention.

[0021] Figure 2 This is a partial three-dimensional structural cross-sectional view of an energy-saving electric motor structure according to the present invention.

[0022] Figure 3 This is a partial breakdown of the structure of an energy-saving electric motor according to the present invention. Figure 1 .

[0023] Figure 4 This is a partial breakdown of the structure of an energy-saving electric motor according to the present invention. Figure 2 .

[0024] Figure 5 This is a partial perspective view of the central shaft of an energy-saving electric motor structure according to the present invention.

[0025] Figure 6This is a partial exploded view of the central shaft of an energy-saving electric motor structure according to the present invention.

[0026] Figure 7 This is a partially exploded view of the rear section of the central shaft of an energy-saving electric motor structure according to the present invention.

[0027] Figure 8 This is a partial top view of the front section of the central shaft of an energy-saving electric motor structure according to the present invention.

[0028] Figure 9 yes Figure 8 Sectional view along the middle AA.

[0029] Figure 10 This is a partial top view of the rear section of the central shaft of an energy-saving electric motor structure according to the present invention.

[0030] Figure 11 yes Figure 10 Sectional view at the middle edge BB.

[0031] The following are the labels in the diagram: 1. Base; 2. Central shaft; 21. Hollow inner cavity; 211. First exhaust duct; 212. Second exhaust duct; 22. Axial heat dissipation outlet; 23. Radial heat dissipation hole; 24. Front section; 241. First external spline; 242. Reinforcing plate; 243. Exhaust channel; 25. Rear section; 251. First internal spline groove; 252. Conical guide plate; 253. Annular exhaust duct; 254. First heat dissipation fan blade; 255. Collar; 2551. Second internal spline groove; 256. Second heat dissipation fan blade; 257. Second external spline; 3. Rotor; 31. Clearance; 4. Stator; 5. Front end cover; 6. Rear end cover; 7. Bearing; 8. Fan cover. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 11As shown: An energy-saving electric motor structure includes a frame 1 and a central shaft 2, a rotor 3, and a stator 4 installed within the frame 1. The rotor 3 is mounted on the central shaft 2, and the stator 4 is sleeved on the outside of the rotor 3. A front cover 5 and a rear cover 6 are detachably connected to both ends of the frame 1, respectively. A bearing 7 is installed in the middle of both the front cover 5 and the rear cover 6. Both ends of the central shaft 2 are connected to the bearing 7 on the corresponding sides. A fan cover 8 is detachably installed at the end of the frame 1 near the rear cover 6. The central shaft 2 has a hollow inner cavity 21. The end of the central shaft 2 near the front cover 5 is closed. An axial heat dissipation outlet 22 is formed at the end of the central shaft 2 near the rear cover 6. A gap 31 is left between the inner ring of the rotor 3 and the outer circumferential surface of the central shaft 2. Radial heat dissipation holes 23 are evenly distributed circumferentially in the middle section of the central shaft 2 corresponding to the position of the gap 31. The radial heat dissipation holes 23 connect the hollow inner cavity 21 of the central shaft 2 and the gap 31.

[0034] In existing electric motors, the heat generated by the stator 4 and rotor 3 during operation is concentrated in the mating area between the rotor 3 and the central shaft 2. This area is enclosed by the stator 4, resulting in poor air circulation. The heat can only be conducted to the frame 1 through the iron core of the rotor 3, and then dissipated through the heat dissipation fins on the frame 1. The heat dissipation efficiency is extremely low. Long-term high temperatures will lead to increased resistance of the rotor 3 conductor bars and aging of the stator 4 insulation layer, which not only increases energy consumption but also shortens the service life of the electric motor. Therefore, this embodiment uses the central shaft 2 with a hollow inner cavity 21 as the core, combined with radial heat dissipation holes 23 and axial heat dissipation outlets 22 on the central shaft 2, to achieve rapid heat dissipation in the heat accumulation area between the central shaft 2 and the rotor 3. The specific working process is as follows: After the motor starts, the central shaft 2 drives the rotor 3 to rotate around the bearing 7. Electromagnetic induction is generated between the stator 4 and the rotor 3, realizing the conversion of electrical energy into mechanical energy. At the same time, the stator 4, rotor 3 and central shaft 2 will generate heat. The heat is concentrated in the gap 31 area between the inner ring of the rotor 3 and the outer circumference of the central shaft 2. When the central shaft 2 rotates, its hollow inner cavity 21 will generate negative pressure due to centrifugal force. At the same time, the hot air in the gap 31 area will naturally flow to the low-pressure area due to the increase in temperature and decrease in density. The hot air in the gap 31 area enters the hollow inner cavity 21 of the central shaft 2 through the radial heat dissipation holes 23 evenly distributed in the middle section of the central shaft 2. The hot air entering the hollow inner cavity 21 flows along the hollow inner cavity 21 towards the end of the central shaft 2 near the rear end cover 6, and finally is discharged into the fan shroud 8 through the axial heat dissipation outlet 22. Then, the fan shroud 8 guides it out of the motor. The fan shroud 8 is set on the outside of the rear end cover 6 to protect the axial heat dissipation outlet 22 and guide the external cold air to circulate, preventing dust from entering.

[0035] Reference Figures 1 to 6As shown: The central shaft 2 is composed of a front section 24 and a rear section 25 coaxially spliced ​​together. The front section 24 and the rear section 25 are detachably connected by a key connection structure. The front section 24 is provided with a first exhaust channel 211, and the rear section 25 is provided with a second exhaust channel 212. The first exhaust channel 211 and the second exhaust channel 212 are connected and together form the hollow inner cavity 21 of the central shaft 2.

[0036] The front section 24 and the rear section 25 are coaxially spliced ​​by a key connection structure. During splicing, the first exhaust channel 211 and the second exhaust channel 212 are aligned and connected to form the hollow inner cavity 21 of the central shaft 2, ensuring the continuity of the heat dissipation air path and not affecting the flow of hot air. When the motor is running, the front section 24 of the central shaft 2 and the rotor 3 rotate, and the torque is transmitted to the rear section 25 through the key connection structure, realizing the synchronous rotation of the two shafts, ensuring the stability of the power transmission of the central shaft 2, and not hindering the flow of hot air in the hollow inner cavity 21. During maintenance, the front section 24 and the rear section 25 can be separated by disassembling the key connection structure to clean the dust and oil in the first exhaust passage 211 and the second exhaust passage 212 separately, and to facilitate replacement. During the heat dissipation process, hot air enters the first exhaust channel 211 of the front section 24 through the radial heat dissipation hole 23, then flows through the second exhaust channel 212 of the rear section 25, and finally exits through the axial heat dissipation outlet 22, ensuring that the heat dissipation air path is uninterrupted and guaranteeing heat dissipation efficiency.

[0037] Reference Figure 6 As shown: The key connection structure includes a first external spline 241 disposed on the end face of the rear section 25 near the front section 24, and a first internal spline groove 251 disposed on the inner wall of the front section 24 near the rear section 25 and adapted to the first external spline 241, wherein the first external spline 241 and the first internal spline groove 251 are fitted together.

[0038] When the motor is running, the torque that the central shaft 2 needs to transmit is borne by the multiple tooth surfaces of the first external spline 241 and the first internal spline groove 251, ensuring that the two shaft sections rotate synchronously and the power transmission is stable. When maintenance and disassembly are required, the first external spline 241 and the first internal spline groove 251 can be separated simply by pulling the front section 24 or the rear section 25 along the axial direction. The operation is simple and facilitates the maintenance and replacement of the central shaft 2.

[0039] Reference Figure 1 , Figure 8 and Figure 9As shown: Multiple reinforcing plates 242 are arranged axially in the first exhaust passage 211 of the front section 24. Each reinforcing plate 242 divides the first exhaust passage 211 into multiple independent exhaust channels 243. Each independent exhaust channel 243 is connected to a corresponding radial heat dissipation hole 23.

[0040] The front section 24 is a hollow structure, and multiple radial heat dissipation holes 23 are machined in the middle section. These radial heat dissipation holes 23 weaken the axial strength of the front section 24. Therefore, multiple reinforcing plates 242 are axially spaced within the first exhaust passage 211 of the front section 24. The reinforcing plates 242 are perpendicular to the axis of the central shaft 2 and cover the cross-section of the first exhaust passage 211, dividing the single first exhaust passage 211 into multiple independent exhaust channels 243. Each independent exhaust channel 243 is connected to a corresponding radial heat dissipation hole 23, ensuring that hot air in the gap 31 area can directly enter the corresponding independent exhaust channel 243 through the corresponding radial heat dissipation hole 23, thus preventing hot air from... During the mixing and turbulence within the channel, the reinforcing plate 242 enhances the structural strength as the motor operates. Multiple reinforcing plates 242 are distributed axially at intervals, which is equivalent to setting multiple support points within the hollow front section 24. This disperses the centrifugal force generated by the rotation of the central shaft 2, compensates for the weakening of the shaft strength by the radial heat dissipation holes 23, prevents deformation and vibration of the front section 24, and ensures stable shaft operation. During the heat dissipation process, the hot air in the gap 31 area is evenly distributed at each radial heat dissipation hole 23 and flows synchronously to the second exhaust duct 212 through the corresponding independent exhaust channels 243. This avoids turbulence within a single channel and ensures that the hot air exhaust speed in each area is basically the same.

[0041] Reference Figure 1 , Figure 2 , Figure 10 and Figure 11 As shown: the end of the rear section 25 away from the front section 24 has a flared structure, which constitutes the axial heat dissipation outlet 22 of the central shaft 2.

[0042] During the heat dissipation process, hot air flows into the flared structure from the second exhaust duct 212. As the flared area gradually increases, the airflow diffusion speed is slow, reducing exhaust resistance and accelerating the exhaust speed of hot air. In addition, the flared structure has the function of guiding airflow, which can guide the exhaust hot air to the outside of the fan cover 8, avoid the formation of vortex at the outlet, prevent hot air from flowing back into the base 1, and ensure that hot air is smoothly discharged to the outside of the motor.

[0043] Reference Figure 1 , Figure 2 , Figure 10 and Figure 11As shown: A conical guide plate 252 is fixedly provided in the middle of the axial heat dissipation outlet 22 of the rear section 25. The conical guide plate 252 and the inner wall of the axial heat dissipation outlet 22 form an annular exhaust channel 253. A plurality of first heat dissipation fan blades 254 are provided in the annular exhaust channel 253, which are equidistantly distributed along the circumference of the conical guide plate 252. The two ends of each first heat dissipation fan blade 254 are fixedly connected to the outer peripheral wall of the conical guide plate 252 and the inner peripheral wall of the rear section 25, respectively.

[0044] A conical guide plate 252 is fixed in the middle of the axial heat dissipation outlet 22. The tip of the conical guide plate 252 faces the second exhaust channel 212. There is a gap between its outer wall and the inner wall of the axial heat dissipation outlet 22, which together form an annular exhaust channel 253. In the annular exhaust channel 253, multiple first heat dissipation fan blades 254 are arranged at equal intervals along the circumference of the conical guide plate 252. One end of the first heat dissipation fan blade 254 is fixedly connected to the outer peripheral wall of the conical guide plate 252, and the other end is fixedly connected to the inner peripheral wall of the rear section 25. The first heat dissipation fan blade 254 rotates synchronously with the central shaft 2. When the central shaft 2 rotates, it drives the first cooling fan blade 254 to rotate synchronously. The rotation of the first cooling fan blade 254 generates axial wind force, which actively pushes the hot air in the annular exhaust duct 253 to one side of the shroud 8. This works in synergy with the centrifugal force of the central shaft 2 rotation to enhance the power of hot air exhaust.

[0045] Reference Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 11 As shown: A collar 255 is fitted on the outer peripheral surface of the rear section 25, and a plurality of second heat dissipation fan blades 256 are provided on the outer peripheral wall of the collar 255, which are equidistantly distributed along its circumference.

[0046] When the central shaft 2 rotates, it drives the collar 255 and the second heat dissipation fan 256 to rotate synchronously. The rotation of the second heat dissipation fan 256 generates radial wind force, which causes the air inside the fan cover 8 to flow rapidly and carries the heat from the outer periphery of the rear section 25 out of the base 1. Hot air in the stator 4 and rotor 3 areas is discharged into the shroud 8 through the axial heat dissipation outlet 22. The wind force generated by the rotation of the second heat dissipation fan blade 256 quickly discharges the hot air in the shroud 8 to the outside of the motor, thereby improving the heat dissipation efficiency.

[0047] Reference Figure 7 As shown: The inner peripheral wall of the collar 255 is provided with a second inner spline groove 2551, and the outer peripheral surface of the rear section 25 is provided with a second outer spline 257 that is adapted to the second inner spline groove 2551. The second outer spline 257 and the second inner spline groove 2551 are fitted together.

[0048] The multi-tooth interlocking structure of the second external spline 257 and the second internal spline groove 2551 can transmit a large torque. The radial wind force generated by the rotation of the second heat dissipation fan blade 256 will not cause the collar 255 to slide relative to the rear section 25, ensuring the stable operation of the external auxiliary heat dissipation air path. When the second heat dissipation fan blade 256 is damaged or the collar 255 needs maintenance, simply pull the collar 255 axially to separate the second external spline 257 from the second internal spline groove 2551. The collar 255 can be quickly disassembled for replacement and cleaning without affecting the normal use of the rear section 25.

[0049] Reference Figure 1 , Figure 8 and Figure 9 As shown: The diameter of the radial heat dissipation hole 23 gradually increases from one side of the outer circumference of the central shaft 2 towards the side of the exhaust channel 243.

[0050] When the motor is running, the hot air in the gap 31 between the rotor 3 and the central shaft 2 increases in temperature and decreases in density, and flows towards the independent exhaust channel 243. The radial heat dissipation holes 23 with flared structure form a funnel-mouth guiding effect, guiding the dispersed hot air to quickly converge to the orifice. The flared design increases the inflow cross-sectional area of ​​the hot air, while reducing the sudden resistance of the airflow entering the channel from the gap 31, avoiding the generation of turbulence at the orifice, and allowing the hot air to flow smoothly and quickly from the radial heat dissipation holes 23 into the corresponding exhaust channel 243.

[0051] Reference Figure 1 and Figure 11 As shown: Both the first heat dissipation fan blade 254 and the second heat dissipation fan blade 256 are arc-shaped blades, and the bending direction of the arc-shaped blades is consistent with the rotation direction of the central axis 2.

[0052] When the central shaft 2 rotates, it drives the first cooling fan blade 254 and the second cooling fan blade 256 to rotate synchronously. The curved blades can better fit the air flow trajectory and efficiently cut the air. The first cooling fan blade 254 generates axial pushing wind force in the annular exhaust channel 253, actively pushing the hot air in the channel to the axial heat dissipation outlet 22, which works in conjunction with the centrifugal force of the central shaft 2 to accelerate the discharge of hot air.

[0053] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. An energy-saving electric motor structure, comprising a frame (1) and a central shaft (2), a rotor (3) and a stator (4) installed in the frame (1), wherein the rotor (3) is mounted on the central shaft (2), the stator (4) is sleeved on the outside of the rotor (3), a front end cover (5) and a rear end cover (6) are detachably connected to both ends of the frame (1), and a bearing (7) is installed in the middle of both the front end cover (5) and the rear end cover (6), and both ends of the central shaft (2) are rotatably connected to the bearings (7) on the corresponding sides, and a fan cover (8) is detachably provided at one end of the frame (1) near the rear end cover (6), characterized in that, The central shaft (2) has a hollow inner cavity (21). The end of the central shaft (2) near the front end cover (5) is closed. The end of the central shaft (2) near the rear end cover (6) forms an axial heat dissipation outlet (22). There is a gap (31) between the inner ring of the rotor (3) and the outer circumferential surface of the central shaft (2). Radial heat dissipation holes (23) are evenly distributed circumferentially in the middle section of the central shaft (2) corresponding to the position of the gap (31). The radial heat dissipation holes (23) connect the hollow inner cavity (21) of the central shaft (2) and the gap (31).

2. The energy-saving electric motor structure according to claim 1, characterized in that, The central shaft (2) is composed of a front section (24) and a rear section (25) coaxially spliced ​​together. The front section (24) and the rear section (25) are detachably connected by a key connection structure. The front section (24) is provided with a first exhaust channel (211), and the rear section (25) is provided with a second exhaust channel (212). The first exhaust channel (211) and the second exhaust channel (212) are connected and together form the hollow inner cavity (21) of the central shaft (2).

3. The energy-saving electric motor structure according to claim 2, characterized in that, The key connection structure includes a first external spline (241) disposed on the end face of the rear section (25) near the front section (24), and a first internal spline groove (251) formed on the inner wall of the front section (24) near the rear section (25) and adapted to the first external spline (241), wherein the first external spline (241) and the first internal spline groove (251) are fitted together.

4. The energy-saving electric motor structure according to claim 2, characterized in that, Multiple reinforcing plates (242) are arranged axially in the first exhaust passage (211) of the front section (24). Each reinforcing plate (242) divides the first exhaust passage (211) into multiple independent exhaust channels (243). Each independent exhaust channel (243) is connected to a corresponding radial heat dissipation hole (23).

5. The energy-saving electric motor structure according to claim 2, characterized in that, The rear section (25) has a flared end away from the front section (24) with a flared structure, which forms the axial heat dissipation outlet (22) of the central shaft (2).

6. The energy-saving electric motor structure according to claim 5, characterized in that, A conical guide plate (252) is fixedly provided in the middle of the axial heat dissipation outlet (22) of the rear section (25). The conical guide plate (252) and the inner wall of the axial heat dissipation outlet (22) form an annular exhaust channel (253). The annular exhaust channel (253) is provided with a plurality of first heat dissipation fan blades (254) equidistantly distributed along the circumference of the conical guide plate (252). The two ends of each first heat dissipation fan blade (254) are fixedly connected to the outer peripheral wall of the conical guide plate (252) and the inner peripheral wall of the rear section (25), respectively.

7. The energy-saving electric motor structure according to claim 2, characterized in that, The outer peripheral surface of the rear section (25) is fitted with a collar (255), and the outer peripheral wall of the collar (255) is provided with a plurality of second heat dissipation fan blades (256) distributed equidistantly along its circumference.

8. The energy-saving electric motor structure according to claim 7, characterized in that, The inner peripheral wall of the collar (255) is provided with a second inner spline groove (2551), and the outer peripheral surface of the rear section (25) is provided with a second outer spline (257) that is adapted to the second inner spline groove (2551). The second outer spline (257) and the second inner spline groove (2551) are fitted together.

9. The energy-saving electric motor structure according to claim 4, characterized in that, The diameter of the radial heat dissipation hole (23) gradually increases from the outer peripheral surface of the central shaft (2) to the exhaust channel (243).

10. An energy-saving electric motor structure according to claim 6 or 7, characterized in that, Both the first heat dissipation fan blade (254) and the second heat dissipation fan blade (256) are arc-shaped blades, and the bending direction of the arc-shaped blades is consistent with the rotation direction of the central axis (2).

Images