Variable frequency speed regulation permanent magnet motor of stator core heat radiation structure without casing

Abstract

The invention, which relates to the technical field of the motor, discloses a variable-frequency and variable-speed permanent magnet motor of a stator core heat dissipation structure without a casing, comprising a stator core, an end cover, a motor shaft, a rotor, an axial fan, a heat dissipation channel, a spacer ring, a heat dissipation port, a protective cover, a baffle plate and a mounting seat, the baffle plate is provided with a communication port corresponding to a mounting cavity and the heat dissipation port; the low-temperature shrinkage stress prevention assembly is mounted on the baffle and used for driving the baffle to rotate, so that the opening part of the heat dissipation opening is opened and closed; and the air flow adjusting assembly is arranged on the mounting seat and is used for adjusting the air flow in the heat dissipation channel based on the rotating speed of the motor shaft. According to the invention, the air flow adjusting assembly is used for adjusting the air flow rate in the heat dissipation channel when the rotating speed of the motor shaft changes, so that the air flow rate in the heat dissipation channel is increased when the rotating speed of the motor shaft is reduced, and thus the air flow rate in the heat dissipation channel is relatively high when the rotating speed of the motor shaft is reduced; and therefore, the influence on the gas flowing effect is small.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a variable-frequency speed-regulating permanent magnet motor with a shell-free stator core heat dissipation structure. Background Art

[0002] A caseless motor is a motor without a housing or end covers, commonly known as a frameless permanent magnet motor. This motor consists primarily of two components: a rotor and a stator, without shafts, bearings, housings, or end covers. Features of caseless motors include: Simple Structure: The lack of a housing or end covers allows for a relatively simple structure, resulting in lower manufacturing and maintenance costs. Efficient Operation: The absence of additional mechanical losses results in high operating efficiency. Wide Range of Applications: Suitable for applications requiring high-precision control and fast response speeds, such as robotic joint drives and industrial automation.

[0003] In the prior art, an axial fan is installed on the motor shaft of a caseless variable-frequency speed-regulating permanent magnet motor. When the motor shaft rotates, it will synchronously drive the axial fan to rotate. When the axial fan rotates, it can generate airflow, which can cool and dissipate heat to the stator core. However, since the speed of the axial fan depends on the speed of the motor shaft, when the motor shaft rotates at a low speed, the airflow generated by the axial fan is relatively weak, and the heat dissipation effect on the stator core is relatively poor. Summary of the Invention

[0004] The object of the present invention is to provide a variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A variable frequency speed regulation permanent magnet motor with a housingless stator core heat dissipation structure, comprising a stator core, an end cover, a motor shaft, and a rotor, an axial flow fan mounted on the rear end of the motor shaft, a plurality of heat dissipation channels formed on the surface of the stator core, a spacer ring disposed between the end cover and the stator core, the spacer ring and the end cover having heat dissipation ports connected to the heat dissipation channels, a protective cover mounted on an end cover corresponding to the rear end of the motor shaft, the axial flow fan mounted within the protective cover, and further comprising: A baffle is rotatably sleeved on a surface of an end cover corresponding to the tail end of the motor shaft, wherein the axial projection area of the baffle covers the heat dissipation opening; A mounting base fixedly connected to the surface of the baffle, the mounting base is provided with a mounting cavity in the form of a through hole, and the baffle is provided with a communication port corresponding to the mounting cavity and the heat dissipation port; An anti-low temperature shrinkage stress component is installed on the baffle and is used to drive the baffle to rotate, thereby opening and closing the heat dissipation port; The air flow regulating component is arranged on the mounting seat and is used to regulate the air flow in the heat dissipating channel based on the rotation speed of the motor shaft.

[0006] Through the above technical solution, in low temperature weather, in the early stage of rotation of the motor shaft, if cold air continues to enter the heat dissipation channel through the heat dissipation port in the low temperature environment, it is easy for key components such as the stator core or the rotor to generate additional stress due to thermal expansion and contraction. Therefore, the baffle is driven to rotate by the anti-low temperature contraction stress component, so that in the low temperature environment, in the early stage of rotation, the baffle is used to close the mouth of the heat dissipation port, so that the airflow generated by the axial flow fan will not enter the heat dissipation channel, avoiding the influence of stress changes on the stator core or the rotor. In addition, by setting an airflow adjustment component, the airflow adjustment component is used to adjust the gas flow rate in the heat dissipation channel when the motor shaft speed changes, thereby achieving an increase in the gas flow rate in the heat dissipation channel when the motor shaft speed decreases. In this way, when the motor shaft speed decreases, the heat dissipation channel has a larger air flow rate, thereby making the gas flow effect less affected.

[0007] Furthermore, two spacer rings are provided and respectively abut against the two axial ends of the stator core, and the end cover, the stator core and the spacer rings are fastened together by a plurality of long screws.

[0008] The above technical solution makes the structure of the motor simpler.

[0009] Furthermore, the anti-low temperature shrinkage stress component includes an arc-shaped rack fixed to the end face of the baffle, the arc-shaped rack is coaxial with the baffle, the wall of the protective cover is installed with an adjusting motor, the motor shaft of the adjusting motor penetrates into the protective cover and is installed with a gear, the gear is externally engaged with the arc-shaped rack, the end cover is installed with a temperature detection module, and the temperature detection module is electrically connected to the external control cabinet.

[0010] Through the above technical solution, when the temperature detection module detects the temperature signal and feeds it back to the external control cabinet, the external control cabinet controls the action of the adjustment motor, and the adjustment motor drives the gear to rotate. When the gear rotates, it engages with the arc-shaped rack, and then the arc-shaped rack drives the baffle to rotate, so that the baffle blocks the heat dissipation port, and the airflow generated by the axial fan will not enter the heat dissipation channel through the heat dissipation port.

[0011] Furthermore, the airflow adjustment assembly includes a reducing sleeve coaxially installed in the installation cavity, the axial ends of the reducing sleeve are open, and the inner and outer diameters decrease successively in the direction away from the protective cover, and the periphery of the reducing sleeve is provided with a plurality of deformation grooves passing through its inner cavity, and the baffle is provided with a reducing unit for driving the elastic deformation of the reducing sleeve to adjust the size of the mouth of the smallest outer diameter end of the reducing sleeve.

[0012] Through the above technical solution, the reducing unit drives the reducing sleeve to produce elastic deformation, thereby changing the size of the mouth of the reducing sleeve with the smallest outer diameter. When the reducing sleeve produces elastic contraction deformation, its mouth is smallest, so that after the air flow enters the heat dissipation port from the mouth of the reducing sleeve, the air flow velocity increases, thereby increasing the speed of the air flow in the heat dissipation channel, and then when the motor shaft rotates at a low speed, by changing the flow velocity of the air flow, the cooling and heat dissipation effect will not be reduced too much.

[0013] Furthermore, the variable diameter unit includes a connecting seat fixed to the end face of the baffle, the connecting seat is fixed with a plurality of mounting arms, the mounting arms are rotatably connected to a rotating part, the rotating part is coaxially threaded with a screw rod, one end of the screw rod penetrates into the inner cavity of the variable diameter sleeve and is hinged with a plurality of hinge rods, and the end of the hinge rod away from the screw rod is hinged to the multiple elastic petal wall surfaces of the variable diameter sleeve divided by the deformation groove.

[0014] Through the above technical solution, the rotating part rotates, so that the rotating part and the screw thread are screwed together, thereby driving the screw to move. When the screw moves, the hinge rod will drive the reducing sleeve to produce elastic expansion deformation or elastic contraction deformation. When the reducing sleeve produces elastic contraction deformation or elastic expansion deformation, the size of the mouth of the smallest outer diameter end of the reducing sleeve will change, thereby making it possible to adjust the gas flow rate in the heat dissipation channel.

[0015] Furthermore, the connecting seat is coaxially connected to a rotating ring, a ring gear is fixed to the periphery of the rotating ring, and the rotating part is provided with a gear part used in conjunction with the ring gear.

[0016] Through the above technical solution, the rotating ring rotates, thereby causing the ring gear and the gear part to engage and transmit, so that the screw rod can rotate, thereby driving the hinge rod to swing.

[0017] Furthermore, the end face of the baffle is coaxially fixed with an annular protrusion, which is slidably fitted on the periphery of the motor shaft, and the periphery of the annular protrusion is slidably fitted with a sliding ring, and the periphery of the sliding ring is fixed with an annular portion, the outer diameter of the annular portion matches the inner diameter of the rotating ring, and the annular portion is coaxially engaged with the rotating ring, and the rotating ring is provided with a driving structure, which is used to drive the rotating ring to generate a rotational motion around the axial direction of the motor shaft when the sliding ring moves along the axial direction of the motor shaft.

[0018] Through the above technical solution, when the sliding ring moves in a direction away from the baffle, the driving structure will be triggered to drive the rotating ring to rotate. When the rotating ring rotates, the ring gear and the gear part will engage and transmit.

[0019] Furthermore, the driving structure includes balls symmetrically embedded in the inner wall of the rotating ring along the axis of the rotating ring, and the periphery of the annular portion is provided with a spiral rolling groove for the balls to engage with and roll freely.

[0020] Through the above technical solution, the balls roll in the spiral rolling grooves, so that the sliding ring can drive the rotating ring to rotate when it moves along the axial direction of the annular protrusion.

[0021] Furthermore, an electromagnet is fixedly mounted on the periphery of the annular protrusion, and the electromagnet is used in conjunction with a sliding ring, and an elastic member is provided between the electromagnet and the sliding ring.

[0022] Through the above technical solution, the elastic member generates an elastic resisting force on the sliding ring, thereby giving the sliding ring potential energy to move toward the adjacent baffle.

[0023] Furthermore, the elastic member is a spring wrapped around the periphery of the annular protrusion, and the two ends of the spring in the elastic force direction elastically press against the electromagnet and the sliding ring respectively.

[0024] Through the above technical solution, the two ends of the spring in the direction of elastic force elastically press against the electromagnet and the sliding ring respectively, thereby generating an elastic pressing force on the sliding ring.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, in low temperature weather, in the early stage of rotation of the motor shaft, if cold air continues to enter the heat dissipation channel through the heat dissipation port in the low temperature environment, it is easy to cause key components such as the stator core or the rotor to generate additional stress due to thermal expansion and contraction. Therefore, the baffle is driven to rotate by the anti-low temperature contraction stress component, so that in the low temperature environment, in the early stage of rotation, the baffle is used to close the mouth of the heat dissipation port, so that the airflow generated by the axial flow fan will not enter the heat dissipation channel, avoiding the influence of stress changes on the stator core or the rotor. In addition, by providing an airflow adjustment component, the airflow adjustment component is used to adjust the gas flow rate in the heat dissipation channel when the motor shaft speed changes, thereby achieving an increase in the gas flow rate in the heat dissipation channel when the motor shaft speed decreases. In this way, when the motor shaft speed decreases, the heat dissipation channel has a larger air flow rate, thereby reducing the influence on the gas flow effect. 2. In the present invention, when the temperature detection module detects a temperature signal and feeds it back to the external control cabinet, the external control cabinet controls the operation of the regulating motor, which drives the gear to rotate. When the gear rotates, it engages with the arc-shaped rack, thereby causing the arc-shaped rack to drive the baffle to rotate, so that the baffle blocks the heat dissipation port, thereby preventing the airflow generated by the axial flow fan from entering the heat dissipation channel through the heat dissipation port; 3. In the present invention, the reducing unit drives the reducing sleeve to produce elastic deformation, thereby changing the size of the opening at the smallest end of the outer diameter of the reducing sleeve. When the reducing sleeve produces elastic contraction deformation, its opening is smallest, so that after the air flow enters the heat dissipation port from the opening of the reducing sleeve, the air flow velocity increases, thereby increasing the speed of the air flow in the heat dissipation channel, and then when the motor shaft rotates at a low speed, by changing the flow velocity of the air flow, the cooling and heat dissipation effect will not be reduced too much. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure in the present invention; Figure 2 for Figure 1 Schematic diagram of the exploded structure; Figure 3 for Figure 2 A schematic diagram of the positional relationship from another perspective; Figure 4 Schematic diagram of the positional relationship among the baffle, mounting base, and mounting arm after assembly in the present invention; Figure 5 Schematic diagram of the positional relationship among the baffle, rotating ring and regulating motor after assembly in the present invention; Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point A; Figure 7 for Figure 5 Schematic diagram of the exploded structure; Figure 8 for Figure 7 A magnified schematic diagram of the local structure at point B in the middle; Figure 9 for Figure 5 Schematic diagram of structural explosion from another perspective; Figure 10 This is a schematic diagram of the positional relationship between the sliding ring and the annular portion after assembly in the present invention.

[0027] In the figure, the description of each figure mark is as follows: 1. Protective cover; 2. Adjusting motor; 3. Stator core; 4. Spacer ring; 5. End cover; 6. Heat dissipation port; 7. Motor shaft; 8. Long screw; 9. Heat dissipation channel; 10. Rotor; 11. Axial fan; 12. Ring gear; 13. Mounting seat; 14. Baffle; 15. Arc rack; 16. Mounting arm; 17. Connecting seat; 18. Mounting cavity; 19. Annular protrusion; 20. Gear; 21. Deformation groove; 22. Reducing sleeve; 23. Hinge rod; 24. Screw; 25. Rotating part; 26. Electromagnet; 27. Connecting port; 28. Spring; 29. Sliding ring; 30. Annular part; 31. Ball; 32. Rotating ring; 33. Spiral rolling groove. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-10 The present invention provides a technical solution: a variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure, comprising a stator core 3, an end cover 5, a motor shaft 7, and a rotor 10. The end cover 5 is provided with two and corresponds to the axial ends of the motor shaft 7 respectively. An axial flow fan 11 is installed at the tail end of the motor shaft 7. A plurality of heat dissipation channels 9 are opened on the surface of the stator core 3. A spacer ring 4 is provided between the end cover 5 and the stator core 3. The spacer ring 4 and the end cover 5 are provided with a heat dissipation port 6 connected to the heat dissipation channel 9, corresponding to a heat dissipation port 6 at the tail end of the motor shaft 7. The end cover 5 is mounted with a protective cover 1, and the axial flow fan 11 is mounted in the protective cover 1. Specifically, two spacer rings 4 are provided and respectively abut against the axial ends of the stator core 3. The end cover 5, the stator core 3 and the spacer ring 4 are fastened together by a plurality of long screws 8. The end cover 5 corresponding to the tail end of the motor shaft 7 (the end with the axial flow fan 11) is rotatably mounted with a baffle 14 by installing a bearing. The baffle 14 can rotate freely around the periphery of the motor shaft 7. In addition, the axial projection area of the baffle 14 can cover all the heat dissipation ports 6. The surface of the baffle 14 is fixed with a mounting seat 13, and the mounting seat 13 is provided with a mounting cavity 18 in the form of a through hole. The baffle 14 is provided with a communication port 27 corresponding to the mounting cavity 18 and the heat dissipation port 6. The end face of the baffle 14 is fixed with an arc-shaped rack 15, and the arc-shaped rack 15 is coaxial with the baffle 14. The wall of the protective cover 1 is installed with an adjustment motor 2, and the motor output shaft of the adjustment motor 2 penetrates into the protective cover 1 and is installed with a gear 20, which is engaged with the outer surface of the arc-shaped rack 15. An end cap 5 at the tail end of the motor shaft 7 is installed with a temperature detection module (not shown in the figure), and the temperature detection module is electrically connected to an external control Cabinet, when the temperature detection module detects the temperature signal and feeds it back to the external control cabinet, the external control cabinet controls the action of the regulating motor 2, that is, when the temperature detected by the temperature detection module is low, the control cabinet controls the regulating motor 2 to be energized, and after the regulating motor 2 is energized, it drives the gear 20 to rotate. When the gear 20 rotates, it engages with the arc-shaped rack 15 for transmission, and then the arc-shaped rack 15 drives the baffle 14 to rotate around the axial direction of the motor shaft 7, so that the baffle 14 blocks the heat dissipation port 6, thereby preventing the airflow generated by the axial flow fan 11 from entering the heat dissipation channel 9 through the heat dissipation port 6; A reducing sleeve 22 is coaxially fixedly installed in the mounting cavity 18. The axial ends of the reducing sleeve 22 are open, and the inner and outer diameters decrease in sequence in the direction away from the protective cover 1. The periphery of the reducing sleeve 22 is provided with a plurality of deformation grooves 21 that penetrate its inner cavity. The end face of the baffle 14 is fixedly connected to a connecting seat 17, and the connecting seat 17 is fixedly connected to a plurality of mounting arms 16. The mounting arm 16 is rotatably connected to a rotating portion 25. The rotating portion 25 is coaxially threaded with a screw rod 24. One end of the screw rod 24 penetrates the inner cavity of the reducing sleeve 22 and is hinged with a plurality of hinge rods 23. The end of the hinge rod 23 away from the screw rod 24 is hinged to the reducing sleeve 2 2 is divided into multiple elastic petal wall surfaces by the deformation groove 21. The connecting seat 17 is coaxially connected to the rotating ring 32. The circumference of the rotating ring 32 is fixedly connected to the ring gear 12. The rotating portion 25 is provided with a gear portion for use with the ring gear 12. The end surface of the baffle 14 is coaxially fixed to the annular protrusion 19. The annular protrusion 19 is slidably mounted on the circumference of the motor shaft 7. The circumference of the annular protrusion 19 is slidably mounted on the sliding ring 29. The circumference of the sliding ring 29 is fixedly connected to the annular portion 30. The outer diameter of the annular portion 30 matches the inner diameter of the rotating ring 32. The annular portion 30 is coaxially engaged with the rotating ring 32. Two balls 31 are rotatably embedded in the inner wall of the rotating ring 32. The two balls 31 are symmetrically arranged along the axial direction of the rotating ring 32. A spiral rolling groove 33 for the balls 31 to engage and roll freely is provided on the periphery of the annular portion 30. An electromagnet 26 is fixedly installed on the periphery of the annular protrusion 19. The electromagnet 26 is used in conjunction with the sliding ring 29. The material of the sliding ring 29 is any one of iron, cobalt and nickel. In this way, when the electromagnet 26 is energized, a magnetic attraction force is generated on the sliding ring 29, thereby providing a spring 28 between the electromagnet 26 and the sliding ring 29. The spring 28 is wrapped around the periphery of the annular protrusion 19, and the elastic force direction of the spring 28 is divided into two ends. The electromagnet 26 and the sliding ring 29 are elastically pressed against each other, and magnetism is generated by energizing the electromagnet 26, which in turn generates a magnetic attraction on the sliding ring 29, causing the sliding ring 29 to move toward the direction of the electromagnet 26 and drive the annular portion 30 to move. When the annular portion 30 moves, the ball 31 rolls in the spiral rolling groove 33, and the rotating ring 32 rotates, thereby enabling the ring gear 12 to rotate. The ring gear 12 is engaged with multiple gear parts, so that when the ring gear 12 rotates, it will synchronously drive all the gear parts to rotate, so that the screw rod 24 can be threadedly screwed with the rotating part 25.

[0030] Working principle of the present invention: In a low-temperature environment, a temperature detection module located on an end cover 5 at the rear end of the motor shaft 7 detects the temperature of the environment in which the motor shaft 7 is located and generates an electrical signal. The electrical signal is fed back to an external control cabinet. The external control cabinet collects the electrical signal and controls the start-up of the regulating motor 2. After the regulating motor 2 is started, the driving gear 20 is rotated. When the gear 20 rotates, it engages with the arc-shaped rack 15 for transmission, thereby causing the arc-shaped rack 15 to drive the baffle 14 to rotate around the axial direction of the motor shaft 7, so that the baffle 14 blocks the heat dissipation port 6, thereby preventing the airflow generated by the axial flow fan 11 from entering the heat dissipation channel 9 through the heat dissipation port 6. The rotation angle of the baffle 14 only needs to ensure that the mouths of all the heat dissipation ports 6 are blocked by the baffle 14, so the rotation parameters of the regulating motor 2 can be flexibly set by those skilled in the art according to actual conditions. Under normal operating conditions, when the speed of the motor shaft 7 is low, the speed of the axial fan 11 is also low, so the airflow generated is relatively weak compared to the airflow at normal speed. Therefore, the weakened airflow has a low flow speed in the heat dissipation channel 9, which affects the heat dissipation and cooling effect of the stator core 3. Therefore, in this embodiment, a speed sensor is installed on the motor shaft 7, and the speed sensor is used to detect the speed of the motor shaft 7. The speed sensor feeds back the speed signal of the motor shaft 7 to the external control cabinet. The external control cabinet controls the external power supply to power the electromagnet 26, so that the electromagnet 26 generates magnetism, and then generates a magnetic attraction force on the slip ring 29, so that the slip ring 29 drives the annular portion 30 to move along the axial direction of the motor shaft 7, thereby causing the ball 31 to roll in the spiral rolling groove 33, causing the rotating ring 32 to rotate. When the rotating ring 32 rotates, the ring gear 12 and all the gear parts will be engaged. The meshing rotation causes the gear portion to drive the rotating portion 25 to rotate. When the rotating portion 25 rotates, the rotating portion 25 is screwed into engagement with the screw rod 24. When the screw rods are screwed into engagement, the screw rod 24 is caused to move along the axial direction of the rotating portion 25, that is, the screw rod 24 is moved in a direction away from the baffle 14, thereby causing the hinge rod 23 to swing. When the hinge rod 23 swings, the extrusion force on the reducing sleeve 22 disappears, thereby causing the reducing sleeve 22 to produce elastic contraction deformation. At this time, the opening of the smallest outer diameter end of the reducing sleeve 22 (the end adjacent to the baffle 14) is reduced. In this way, when the air flow generated by the axial flow fan 11 passes through the smallest outer diameter port of the reducing sleeve 22, the flow rate of the air flow will increase, thereby increasing the flow rate of the air flow in the heat dissipation channel 9, thereby reducing the influence of the reduction in the speed of the motor shaft 7 on the heat dissipation effect of the heat dissipation channel 9 to a certain extent. In addition, at this time, the spring 28 is in a compressed state and accumulates elastic potential energy. When the speed of the motor shaft 7 is within the normal range, the external control cabinet controls the external power supply to disconnect the power supply to the electromagnet 26, and the magnetism of the electromagnet 26 disappears, so that the elastic potential energy accumulated in the spring 28 is released, and then the sliding ring 29 is driven to move toward the baffle 14, thereby causing the rotating ring 32 to rotate in the opposite direction, and causing the screw rod 24 to move in the opposite direction, so that the hinge rod 23 generates an extrusion force on the elastic petal body of the reducer sleeve 22, so that the reducer sleeve 22 is subjected to an extrusion force along its radial outer side, so that the reducer sleeve 22 will produce elastic expansion deformation, so that the mouth of the smallest outer diameter end of the reducer sleeve 22 is expanded, so that the gas flow rate in the heat dissipation channel 9 is relatively reduced, but the gas flow rate is relatively increased, and then it can flow in the heat dissipation channel 9 through the airflow, so that the stator core 3 is cooled and cooled.

[0031] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A variable frequency speed regulation permanent magnet motor with a housing-less stator core heat dissipation structure, comprising a stator core (3), an end cover (5), a motor shaft (7), and a rotor (10), wherein an axial flow fan (11) is installed at the tail end of the motor shaft (7), a plurality of heat dissipation channels (9) are provided on the surface of the stator core (3), a spacer ring (4) is provided between the end cover (5) and the stator core (3), a heat dissipation port (6) in communication with the heat dissipation channel (9) is provided on the spacer ring (4) and the end cover (5), a protective cover (1) is installed on an end cover (5) corresponding to the tail end of the motor shaft (7), and the axial flow fan (11) is installed in the protective cover (1), characterized in that: Also includes: A baffle (14) is rotatably sleeved on a surface of an end cover (5) corresponding to the tail end of the motor shaft (7), and an axial projection area of the baffle (14) covers the heat dissipation port (6); A mounting seat (13) fixedly connected to the surface of the baffle (14), the mounting seat (13) being provided with a mounting cavity (18) in the form of a through hole, and the baffle (14) being provided with a communication port (27) corresponding to the mounting cavity (18) and the heat dissipation port (6); An anti-low-temperature shrinkage stress component is installed on the baffle (14) and is used to drive the baffle (14) to rotate, thereby opening and closing the heat dissipation port (6). The anti-low-temperature shrinkage stress component includes an arc-shaped rack (15) fixed to the end face of the baffle (14). An adjusting motor (2) is installed on the wall of the protective cover (1). The motor shaft of the adjusting motor (2) penetrates into the protective cover (1) and is installed with a gear (20). The gear (20) is externally meshed with the arc-shaped rack (15). The end cover (5) is installed with a temperature detection module. An airflow regulating assembly is provided on the mounting seat (13) and is configured to regulate the gas flow rate in the heat dissipation channel (9) based on the rotational speed of the motor shaft (7). The airflow regulating assembly comprises a reducing sleeve (22) and a reducing unit coaxially mounted in the mounting cavity (18).

2. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 1, characterized in that: Two spacer rings (4) are provided and respectively abut against the axial ends of the stator core (3); the end cover (5), the stator core (3) and the spacer ring (4) are fastened together by a plurality of long screws (8).

3. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 1, characterized in that: The arc-shaped rack (15) is coaxial with the baffle (14), and the temperature detection module is electrically connected to an external control cabinet.

4. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 1, characterized in that: The reducing sleeve (22) is open at both axial ends, and the inner and outer diameters decrease in sequence in a direction away from the protective cover (1). The reducing sleeve (22) is provided with a plurality of deformation grooves (21) penetrating its inner cavity on its periphery. The reducing unit is provided on the baffle (14) and is used to drive the reducing sleeve (22) to elastically deform so as to adjust the size of the opening of the reducing sleeve (22) at the end with the smallest outer diameter.

5. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 4, characterized in that: The variable diameter unit comprises a connecting seat (17) fixed to the end face of the baffle (14), the connecting seat (17) being fixed to a plurality of mounting arms (16), the mounting arms (16) being rotatably connected to a rotating portion (25), the rotating portion (25) being coaxially threaded with a screw rod (24), one end of the screw rod (24) being inserted into the inner cavity of the variable diameter sleeve (22) and being hinged to a plurality of hinge rods (23), the end of the hinge rod (23) being away from the screw rod (24) being hinged to a plurality of elastic petal wall surfaces of the variable diameter sleeve (22) divided by the deformation groove (21).

6. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 5, characterized in that: The connecting seat (17) is coaxially connected to a rotating ring (32), a ring gear (12) is fixed to the periphery of the rotating ring (32), and the rotating portion (25) is provided with a gear portion for use with the ring gear (12).

7. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 6, characterized in that: The end face of the baffle (14) is coaxially fixed with an annular protrusion (19), the annular protrusion (19) is slidably fitted on the periphery of the motor shaft (7), the periphery of the annular protrusion (19) is slidably fitted with a sliding ring (29), the periphery of the sliding ring (29) is fixed with an annular portion (30), the outer diameter of the annular portion (30) matches the inner diameter of the rotating ring (32), the annular portion (30) is coaxially engaged with the rotating ring (32), and the rotating ring (32) is provided with a driving structure, the driving structure is used to drive the rotating ring (32) to generate a rotational motion around the axial direction of the motor shaft (7) when the sliding ring (29) moves along the axial direction of the motor shaft (7).

8. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 7, characterized in that: The driving structure comprises balls (31) symmetrically embedded in the inner wall surface of the rotating ring (32) along the axis of the rotating ring (32), and a spiral rolling groove (33) for the balls (31) to engage and roll freely is provided on the periphery of the annular portion (30).

9. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 7, characterized in that: An electromagnet (26) is fixedly mounted on the periphery of the annular protrusion (19). The electromagnet (26) is used in conjunction with a sliding ring (29). An elastic member is provided between the electromagnet (26) and the sliding ring (29).

10. The variable frequency speed regulation permanent magnet motor with a shell-less stator core heat dissipation structure according to claim 9, characterized in that: The elastic member is a spring (28) wrapped around the periphery of the annular protrusion (19), and the two ends of the spring (28) in the elastic force direction elastically press against the electromagnet (26) and the sliding ring (29) respectively.

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