Intelligent high-efficiency energy-saving motor for mine

Abstract

The invention discloses a mine intelligent efficient energy-saving motor, and particularly relates to the technical field of motors, the mine intelligent efficient energy-saving motor comprises a motor main shaft, a motor shell, a rotor unit and a stator unit, the motor main shaft comprises a middle shaft, first connecting shafts, a second connecting shaft and an output shaft, and the two ends of the middle shaft are each connected with one first connecting shaft; the outer side of each first connecting shaft is connected with a second connecting shaft, one second connecting shaft is connected with the output shaft, the rotor unit comprises a rotor barrel, first rotor discs and second rotor discs, the rotor barrel is connected to the middle shaft in a sleeving mode, the first rotor discs connected with the middle shaft in a bolted mode are arranged on the two sides of the rotor barrel, and the second rotor discs are connected with the first rotor discs in a bolted mode. The outer side of each first rotor disc is in bolted connection with a second rotor disc, the first rotor discs and the second rotor discs are made of ultra-strong permanent magnets without harmonic loss and with ultra-high internal resistance, and the stator unit is a stator assembly made by winding a semi-superconducting electromagnetic wire on an iron core with ultra-high magnetic permeability. The invention has the advantages of high efficiency and energy conservation.

Description

Technical Field

[0001] The present invention relates to the field of motor technology, and more specifically, to a smart, efficient and energy-saving motor for mines. Background Art

[0002] In today's mining industry, with the continuous advancement of technology and the increasing demand for energy efficiency, motors, as the key power source in mining equipment, have attracted much attention for their performance and energy-saving effects. Traditional motors have many problems during operation, such as large energy loss and low efficiency, which not only increases the operating costs of mines, but also puts a certain amount of pressure on the environment. Therefore, the development of a new type of high-efficiency and energy-saving motor is of great practical significance.

[0003] The stator winding of a traditional motor is usually made of ordinary conductive materials, such as copper wire. When current passes through, a large amount of power loss, namely copper loss, will be generated due to the resistance of the wire itself. This copper loss will accumulate during the long-term operation of the motor, resulting in a large waste of energy.

[0004] The existence of internal resistance reduces the efficiency of the motor in converting electrical energy into mechanical energy. A large amount of electrical energy is converted into heat energy and dissipated, which not only causes energy waste, but also requires additional heat dissipation equipment to maintain the normal operating temperature of the motor, further increasing energy consumption and equipment costs.

[0005] The design and manufacturing process of traditional motors are relatively simple and cannot fully optimize the motor's operating performance. During the energy conversion process, due to the existence of various losses, the ratio of actual output mechanical energy to input electrical energy is relatively low, which cannot meet the needs of efficient production in mines.

[0006] Mining operations usually require motors to run continuously for long periods of time. The low efficiency of traditional motors will lead to a significant increase in energy costs, and will also affect the overall production efficiency and economic benefits of the mine.

[0007] Therefore, a smart and efficient energy-saving motor for mines is proposed. Summary of the invention

[0008] In order to overcome the above-mentioned defects of the prior art, the present invention provides a smart high-efficiency energy-saving motor for mining to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A smart high-efficiency energy-saving motor for mining, comprising a motor spindle, a motor housing, a rotor unit and a stator unit; The motor main shaft is rotatably mounted on the motor housing, and the rotor unit and the stator unit are sleeved on the motor main shaft and arranged in the motor housing; The motor main shaft comprises a central shaft, a first connecting shaft, a second connecting shaft and an output shaft, both ends of the central shaft are connected to a first connecting shaft, the outer sides of each of the first connecting shafts are connected to a second connecting shaft, and one of the second connecting shafts is connected to the output shaft; The rotor unit comprises a rotor barrel, a first rotor disk and a second rotor disk. The rotor barrel is sleeved on the central shaft. First rotor disks bolted to the central shaft are arranged on both sides of the rotor barrel. Second rotor disks are bolted to the outer sides of each of the first rotor disks. The first rotor disk and the second rotor disk are both made of ultra-strong permanent magnets with ultra-high internal resistance and no harmonic loss. The stator unit is made of semi-superconducting electromagnetic wire, which is wound on an iron core with ultra-high magnetic permeability to form a stator assembly.

[0010] Preferably, the semi-superconducting electromagnetic wire comprises a silver-copper base tape and a metal element film, and the surface of the silver-copper base tape is plated with a metal element film containing seventeen metal elements.

[0011] Preferably, the motor housing includes end covers, bearing seats, a cylinder shell, a bottom support plate, a fixing plate, a reinforcing plate and fixing ears. End covers are bolted on both sides of the cylinder shell, and a bearing seat sleeved on the motor main shaft is installed on the outer side of each end cover. A bottom support plate is welded to the bottom end of the cylinder shell, a fixing plate is welded to the bottom end of the bottom support plate, reinforcing plates are welded on both sides of the fixing plate, and fixing ears are symmetrically welded to the top end of the cylinder shell.

[0012] Preferably, a shaft seat groove is provided on the outer side of the end cover, a shaft hole is provided in the middle of the shaft seat groove, a bearing seat is installed in the shaft seat groove, and a second connecting shaft is inserted in the shaft hole.

[0013] Preferably, a convex disc is arranged inside the end cover, and the convex disc is inserted into the cylinder shell.

[0014] Preferably, a slot is provided on one side of the first rotor disk, a first set of holes is provided in the middle of the slot, the side of the first rotor disk provided with the slot is connected to the rotor barrel, and the first set of holes is sleeved on the first connecting shaft, and screws are installed at the joint between the first rotor disk and the central shaft.

[0015] Preferably, a sleeve groove is formed on one side of the second rotor disk, a second sleeve hole is formed in the middle of the sleeve groove, the outer side of the first rotor disk is inserted into the sleeve groove, and the second sleeve hole is sleeved on the first connecting shaft.

[0016] Preferably, a radial air passage is arranged on one side of the rotor unit, and a return air passage is formed with the motor housing on the other side, and the outer circle of the rotor unit and the motor housing form a connecting air passage; a main shaft cavity and a return air hole and an air outlet hole connected with the main shaft cavity are arranged on the motor main shaft; The radial air passage, the connecting air passage, the return air passage, the return air hole, the main shaft inner cavity and the air outlet hole are sequentially connected to form a circulating air passage; The stator unit is provided with a first annular flow channel, a second annular flow channel and a radial flow channel; one end of the radial flow channel is connected to the first annular flow channel, and the other end is connected to the second annular flow channel; the first annular flow channel, the second annular flow channel and the radial flow channel constitute a cooling channel.

[0017] Technical effects and advantages of the present invention: 1. The rotor unit adopts ultra-high internal resistance and ultra-strong permanent magnets without harmonic loss to make the first rotor disk and the second rotor disk, which can reduce the harmonic influence and thus improve the energy conversion efficiency.

[0018] 2. The stator unit uses semi-superconducting electromagnetic wire wound on an ultra-high magnetic permeability iron core to reduce resistance loss and improve the efficiency of converting electrical energy into mechanical energy. The semi-superconducting electromagnetic wire is plated with a variety of metal element films on the surface of the silver-copper base tape to further reduce the resistance of the electromagnetic wire, reduce power loss, and make the motor run more efficiently.

[0019] 3. The motor main shaft consists of a central shaft, a first connecting shaft, a second connecting shaft and an output shaft. The special connection structure optimizes the overall layout of the motor and helps to improve the operating performance.

[0020] 4. The first rotor disc is accurately sleeved on the first connecting shaft through the empty slot and the first set of holes and connected to the rotor barrel and the central shaft screw, which ensures the structural integrity and stability of the rotor unit, facilitates installation and disassembly, and is reliably fixed in position, so that the rotor can stably follow the rotation of the motor main shaft, improving operating efficiency and reliability. The second rotor disc is conveniently connected to the first rotor disc and the first connecting shaft through the sleeve slot and the second set of holes, ensuring that the various components of the rotor unit are tightly and stably connected. The two rotor discs work together to stably generate a magnetic field that interacts with the stator unit, improving the output performance and stability of the motor.

[0021] 5. The motor housing includes an end cover, a bearing seat, a cylinder shell, a bottom support plate, a fixing plate, a reinforcing plate and a fixing ear. The end cover cooperates with the bearing seat to ensure the stable rotation of the motor spindle; the cylinder shell is connected by a bottom support plate, a fixing plate and a reinforcing plate to enhance the overall strength and stability and better protect the internal components.

[0022] 6. The fixing ears facilitate the installation and fixation of the motor, so that the motor can run stably in the complex environment of the mine and reduce the impact of the unstable shell structure on the motor performance. The internal convex disc of the end cover is plugged into the shell to enhance the connection strength and sealing, prevent dust, moisture and other impurities from entering the motor, protect electrical components and mechanical parts, ensure the normal operation of the motor in harsh environments, and improve reliability and stability.

[0023] In summary, due to the reduction of resistance loss, copper loss and harmonic influence, the energy consumption of the motor during operation is reduced, and the energy-saving effect is improved. At the same time, the size and weight of the motor are reduced, and the economic benefits of mining production are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 It is a schematic diagram of the cut-away three-dimensional structure of the present invention.

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention.

[0027] Figure 4 It is a schematic structural diagram of the motor spindle of the present invention.

[0028] Figure 5 It is a schematic structural diagram of the first rotor disk of the present invention.

[0029] Figure 6 It is a schematic structural diagram of the second rotor disk of the present invention.

[0030] Figure 7 It is a schematic diagram of the outer structure of the end cover of the present invention.

[0031] Figure 8 It is a schematic diagram of the inner structure of the end cover of the present invention.

[0032] Fig. 9 It is a schematic structural diagram of the motor housing of the present invention.

[0033] The accompanying drawings are marked as follows: 100, motor main shaft; 200, motor housing; 300, rotor unit; 400, stator unit; 110, central shaft; 120, first connecting shaft; 130, second connecting shaft; 140, output shaft; 210, end cover; 220, bearing seat; 230, cylinder shell; 240, bottom support plate; 250, fixing plate; 260, reinforcing plate; 270, fixing ear; 211, shaft seat groove; 212, shaft hole; 213, flange; 310, rotor barrel; 320, first rotor disk; 330, second rotor disk; 321, empty slot; 322, first set of holes; 331, sleeve slot; 332, second set of holes. DETAILED DESCRIPTION

[0034] 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.

[0035] As attached Figure 1-9 The intelligent high-efficiency energy-saving motor for mining shown includes a motor main shaft 100, a motor housing 200, a rotor unit 300 and a stator unit 400; The motor main shaft 100 is rotatably mounted on the motor housing 200, and the rotor unit 300 and the stator unit 400 are sleeved on the motor main shaft 100 and disposed in the motor housing 200; The motor main shaft 100 includes a central shaft 110, a first connecting shaft 120, a second connecting shaft 130 and an output shaft 140. Both ends of the central shaft 110 are connected to a first connecting shaft 120, and the outer sides of each first connecting shaft 120 are connected to a second connecting shaft 130. One of the second connecting shafts 130 is connected to the output shaft 140. The rotor unit 300 includes a rotor barrel 310, a first rotor disk 320 and a second rotor disk 330. The rotor barrel 310 is sleeved on the central axis 110. First rotor disks 320 bolted to the central axis 110 are arranged on both sides of the rotor barrel 310. Second rotor disks 330 are bolted to the outer sides of each of the first rotor disks 320. The first rotor disks 320 and the second rotor disks 330 are both made of ultra-strong permanent magnets with ultra-high internal resistance and no harmonic loss. The stator unit 400 is made of semi-superconducting electromagnetic wire, which is wound on an iron core with ultra-high magnetic permeability to form a stator assembly.

[0036] During specific implementation, the motor main shaft 100 is rotatably installed in the motor housing 200, wherein the first connecting shaft 120 is connected to the first connecting shaft 130 at both ends of the central axis 110 of the motor main shaft 100, the second connecting shaft 130 is connected to the outer side of the first connecting shaft 120, and a second connecting shaft 130 is connected to the output shaft 140. The rotor barrel 310 of the rotor unit 300 is sleeved on the central axis 110, the first rotor disks 320 on both sides of the rotor barrel 310 are bolted to the central axis 110, the second rotor disk 330 on the outer side of the first rotor disk 320 is bolted to the first rotor disk 320, and the first rotor disk 320 and the second rotor disk 330 are both made of ultra-high internal resistance and ultra-strong permanent magnets without harmonic loss, the stator unit 400 is made of semi-superconducting electromagnetic wire wound on an ultra-high magnetic permeability iron core to form a stator assembly, and is sleeved on the motor main shaft 100 together with the rotor unit 300 and arranged in the motor housing 200, by adopting special The motor main shaft 100, rotor unit 300 and stator unit 400 with special structures optimize the overall structure of the motor and help improve the operating performance of the motor. The rotor unit 300 is made of ultra-strong permanent magnets with ultra-high internal resistance without harmonic loss, which can reduce the influence of harmonics and improve energy conversion efficiency. The stator unit 400 is made of semi-superconducting electromagnetic wire wound on an ultra-high magnetic permeability iron core, which can reduce resistance loss and improve the efficiency of converting electrical energy into mechanical energy. It also forms a superconducting effect by relying on the skin effect when high-frequency alternating current passes through. The internal resistance can be ignored and the copper loss is almost zero, thereby improving the energy saving effect.

[0037] The semi-superconducting electromagnetic wire comprises a silver-copper base tape and a metal element film, and the surface of the silver-copper base tape is plated with a metal element film containing seventeen kinds of metal elements.

[0038] In specific implementation, the semi-superconducting electromagnetic wire structure is used by plating a variety of metal element films on the surface of the silver-copper base tape, which can further reduce the resistance of the electromagnetic wire and reduce the power loss (i.e. copper loss) generated when current passes through. Compared with the stator winding made of ordinary conductive materials (such as copper wire) in traditional motors, it can significantly improve the energy-saving effect of the motor and enable the motor to convert electrical energy into mechanical energy more efficiently during operation.

[0039] The motor housing 200 includes an end cover 210, a bearing seat 220, a cylinder shell 230, a bottom support plate 240, a fixing plate 250, a reinforcing plate 260 and a fixing ear 270. The cylinder shell 230 is bolted with end covers 210 on both sides. The outer side of each end cover 210 is mounted with a bearing seat 220 sleeved on the motor main shaft 100. The bottom end of the cylinder shell 230 is welded with a bottom support plate 240, the bottom end of the bottom support plate 240 is welded with a fixing plate 250, reinforcing plates 260 are welded on both sides of the fixing plate 250, and fixing ears 270 are symmetrically welded to the top of the cylinder shell 230.

[0040] During specific implementation, the end cover 210 cooperates with the bearing seat 220 to ensure the stable rotation of the motor main shaft 100; the cylindrical shell 230 is connected by the bottom support plate 240, the fixing plate 250, and the reinforcing plate 260, which enhances the overall strength and stability of the motor housing 200, and can better protect the internal motor main shaft 100, the rotor unit 300 and the stator unit 400 and other components; the fixing plate 250 is used for grounding and fixing, and the setting of the fixing ear 270 facilitates the installation and fixation of the motor, so that the motor can operate stably in complex environments such as mines, reducing the impact of the unstable shell structure on the motor performance.

[0041] A shaft seat groove 211 is formed on the outer side of the end cover 210 , a shaft hole 212 is formed in the middle of the shaft seat groove 211 , a bearing seat 220 is installed in the shaft seat groove 211 , and a second connecting shaft 130 is inserted into the shaft hole 212 .

[0042] During specific implementation, the shaft seat groove 211 provides an accurate installation position for the bearing seat 220, ensuring the stability of the installation of the bearing seat 220, and further ensuring the smooth rotation of the motor main shaft 100; the shaft hole 212 cooperates with the second connecting shaft 130, so that the motor main shaft 100 can be accurately connected to the end cover 210, making the power output of the motor more stable and reliable, reducing vibration and energy loss caused by improper connection, and improving the overall performance and service life of the motor.

[0043] A convex disc 213 is disposed inside the end cover 210 , and the convex disc 213 is inserted into the cylinder shell 230 .

[0044] In specific implementation, the plug-in fit between the convex disc 213 and the cylindrical shell 230 enhances the connection strength and sealing between the end cover 210 and the cylindrical shell 230, helps prevent dust, moisture and other impurities from entering the interior of the motor, protects the electrical components and mechanical parts inside the motor, ensures the normal operation of the motor in harsh environments such as mines, reduces failures caused by the entry of impurities, and improves the reliability and stability of the motor.

[0045] A slot 321 is formed on one side of the first rotor disk 320, a first set of holes 322 is formed in the middle of the slot 321, the side of the first rotor disk 320 where the slot 321 is formed is connected to the rotor barrel 310, and the first set of holes 322 is sleeved on the first connecting shaft 120, and screws are installed at the joint between the first rotor disk 320 and the central shaft 110.

[0046] In specific implementation, the design of the empty groove 321 and the first set of holes 322 enables the first rotor disk 320 to be accurately sleeved on the first connecting shaft 120 and connected to the rotor barrel 310, thereby ensuring the structural integrity and stability of the rotor unit 300; the first rotor disk 320 is connected to the central axis 110 by screws, which is convenient for installation and disassembly, while ensuring the fixed position of the first rotor disk 320 on the central axis 110, so that the rotor unit 300 can stably follow the rotation of the motor main shaft 100 during the operation of the motor, thereby improving the operating efficiency and reliability of the motor.

[0047] A sleeve groove 331 is formed on one side of the second rotor disk 330 , a second sleeve hole 332 is formed in the middle of the sleeve groove 331 , the outer side of the first rotor disk 320 is inserted into the sleeve groove 331 , and the second sleeve hole 332 is sleeved on the first connecting shaft 120 .

[0048] In specific implementation, the structure of the sleeve groove 331 and the second sleeve hole 332 enables the second rotor disk 330 to be conveniently connected to the first rotor disk 320 and the first connecting shaft 120, ensuring the tightness and stability of the connection between the various components in the rotor unit 300, making the overall structure of the rotor unit 300 more stable. When the motor is running, the two rotor disks can work together to stably generate a magnetic field to interact with the stator unit 400, which helps to improve the output performance of the motor and the stability of operation.

[0049] The rotor unit 300 is provided with a radial air passage on one side, and a return air passage is formed with the motor housing 200 on the other side. The outer circle of the rotor unit 300 and the motor housing 200 form a communicating air passage. The motor main shaft 100 is provided with a main shaft inner cavity and a return air hole and an air outlet hole communicating with the main shaft inner cavity. The radial air passage, the connecting air passage, the return air passage, the return air hole, the main shaft inner cavity and the air outlet hole are sequentially connected to form a circulating air passage; The stator unit 400 is provided with a first annular flow channel, a second annular flow channel and a radial flow channel; one end of the radial flow channel is connected to the first annular flow channel, and the other end is connected to the second annular flow channel; the first annular flow channel, the second annular flow channel and the radial flow channel constitute a cooling channel.

[0050] During specific implementation, the rotor unit 300 drives the motor main shaft 100 to rotate. As the rotor unit 300 rotates around its own axis, the gas in the radial airway is driven to rotate with the rotor unit 300, thereby generating centrifugal force to make the gas in the radial airway flow toward the outer circle of the rotor unit 300, that is, flow toward the connecting airway. At the same time, negative pressure is generated due to the outflow of gas in the radial airway. Driven by the pressure difference generated by the negative pressure and the centrifugal force, the gas flows through the radial airway, the connecting airway, the return airway, the return air hole, the main shaft cavity and the air outlet hole in turn to form an internal circulation flow, so that the heat is evenly distributed and heat accumulation is prevented.

[0051] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change; Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other; Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Intelligent high-efficiency energy-saving motor for mines, characterized by: It comprises a motor main shaft (100), a motor housing (200), a rotor unit (300) and a stator unit (400); The motor main shaft (100) is rotatably mounted on the motor housing (200); the rotor unit (300) and the stator unit (400) are sleeved on the motor main shaft (100) and arranged in the motor housing (200); The motor main shaft (100) comprises a central shaft (110), a first connecting shaft (120), a second connecting shaft (130) and an output shaft (140); both ends of the central shaft (110) are connected to a first connecting shaft (120); the outer sides of each of the first connecting shafts (120) are connected to a second connecting shaft (130); and one of the second connecting shafts (130) is connected to the output shaft (140); The rotor unit (300) comprises a rotor barrel (310), a first rotor disk (320) and a second rotor disk (330); the rotor barrel (310) is sleeved on the central shaft (110); first rotor disks (320) bolted to the central shaft (110) are arranged on both sides of the rotor barrel (310); a second rotor disk (330) is bolted to the outer side of each first rotor disk (320); and the first rotor disk (320) and the second rotor disk (330) are both made of ultra-high internal resistance and ultra-strong permanent magnets without harmonic loss; The stator unit (400) is made of semi-superconducting electromagnetic wire, which is wound on an iron core with ultra-high magnetic permeability to form a stator assembly.

2. The intelligent high-efficiency energy-saving motor for mines according to claim 1 is characterized in that: The semi-superconducting electromagnetic wire comprises a silver-copper base tape and a metal element film, and the surface of the silver-copper base tape is plated with a metal element film containing seventeen kinds of metal elements.

3. The intelligent high-efficiency energy-saving motor for mines according to claim 2 is characterized in that: The motor housing (200) comprises an end cover (210), a bearing seat (220), a cylinder shell (230), a bottom support plate (240), a fixing plate (250), a reinforcing plate (260) and a fixing ear (270); both sides of the cylinder shell (230) are bolted with end covers (210); the outer side of each end cover (210) is mounted with a bearing seat (220) sleeved on the motor main shaft (100); the bottom end of the cylinder shell (230) is welded with a bottom support plate (240); the bottom end of the bottom support plate (240) is welded with a fixing plate (250); both sides of the fixing plate (250) are welded with reinforcing plates (260); and the top end of the cylinder shell (230) is symmetrically welded with fixing ears (270).

4. The intelligent high-efficiency energy-saving motor for mines according to claim 3 is characterized in that: A shaft seat groove (211) is formed on the outer side of the end cover (210), a shaft hole (212) is formed in the middle of the shaft seat groove (211), a bearing seat (220) is installed in the shaft seat groove (211), and a second connecting shaft (130) is inserted into the shaft hole (212).

5. The intelligent high-efficiency energy-saving motor for mines according to claim 4 is characterized in that: A convex disc (213) is provided inside the end cover (210), and the convex disc (213) is inserted into the cylinder shell (230).

6. The intelligent high-efficiency energy-saving motor for mines according to claim 5 is characterized in that: A hollow slot (321) is provided on one side of the first rotor disk (320), a first set of holes (322) is provided in the middle of the hollow slot (321), the side of the first rotor disk (320) provided with the hollow slot (321) is connected to the rotor barrel (310), and the first set of holes (322) is sleeved on the first connecting shaft (120), and screws are installed at the joint between the first rotor disk (320) and the central shaft (110).

7. The intelligent high-efficiency energy-saving motor for mining according to claim 6 is characterized in that: A sleeve groove (331) is formed on one side of the second rotor disk (330), a second sleeve hole (332) is formed in the middle of the sleeve groove (331), the outer side of the first rotor disk (320) is inserted into the sleeve groove (331), and the second sleeve hole (332) is sleeved on the first connecting shaft (120).

8. The intelligent high-efficiency energy-saving motor for mines according to claim 7 is characterized in that: The rotor unit (300) is provided with a radial air passage on one side, and forms a return air passage with the motor housing (200) on the other side; the outer circle of the rotor unit (300) and the motor housing (200) form a communicating air passage; the motor main shaft (100) is provided with a main shaft inner cavity, and a return air hole and an air outlet hole communicating with the main shaft inner cavity; The radial air passage, the connecting air passage, the return air passage, the return air hole, the main shaft inner cavity and the air outlet hole are sequentially connected to form a circulating air passage; The stator unit (400) is provided with a first annular flow channel, a second annular flow channel and a radial flow channel; one end of the radial flow channel is connected to the first annular flow channel, and the other end is connected to the second annular flow channel; the first annular flow channel, the second annular flow channel and the radial flow channel constitute a cooling channel.

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