High-frequency sinusoidal high-starting-torque permanent magnet synchronous motor

Abstract

The application discloses a high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor and belongs to the motor field. The motor comprises a stator, a rotor, a rotating shaft and a casing. The rotating shaft is arranged in the rotor and used for supporting the rotor. The rotor rotates in the stator. The stator is fixedly connected to the casing. The inner wall of the stator is provided with stator teeth and stator slots. The stator teeth and the stator slots are arranged alternately. The stator teeth are arranged in a multi-tooth shape along the length extension direction of the stator. The stator slots are arranged in a slight inclination along the length direction of the stator. The application has the effect of reducing the motor noise, reducing the damage to the motor itself and prolonging the service life of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor. Background Technology

[0002] Currently, permanent magnet synchronous motors, with their advantages of high power density and torque density, have become the preferred drive solution for key components of new energy electric vehicles. In today's society, with increasing awareness of environmental protection and rising demands for vehicle performance, new energy electric vehicles have been widely applied and developed rapidly. The requirements for range and energy efficiency in electric vehicles are increasing, which places more stringent standards on the drive motors of air conditioning compressors. Currently, technological development in this field still faces many challenges.

[0003] In improving motor performance, motor noise remains a crucial indicator. During production, motor noise is often accompanied by vibration; prolonged vibration can lead to fatigue damage to motor bearings, gears, and other components, shortening equipment lifespan. In factory production, especially in high-precision instrument processing, motor noise can interfere with the stability of automated equipment such as sensors and CNC machine tools. Motor noise can mask abnormal sounds within the motor, potentially causing product quality degradation or even motor damage. In daily life, motor noise can negatively impact the health of workers, affect human hearing, and harm other organisms in the vicinity.

[0004] Most existing methods for reducing motor noise involve installing soundproof covers and sound-absorbing cotton. While these can reduce the impact of noise on the environment and humans, they are expensive and do not fundamentally reduce noise; the noise still affects the motor. Summary of the Invention

[0005] In order to reduce motor noise, thereby reducing damage to the motor itself and extending its service life, this application provides a high-frequency sinusoidal high starting torque permanent magnet synchronous motor.

[0006] The high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor provided in this application adopts the following technical solution: A high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor includes a stator, a rotor, a shaft, and a housing. The shaft passes through the rotor to support it. The rotor rotates within the stator, and the stator is fixedly connected to the housing. The inner wall of the stator is provided with stator teeth and stator slots, which are staggered. The stator teeth are multi-toothed along the length of the stator, and the stator slots are slightly inclined along the length of the stator.

[0007] By adopting the above technical solution, when the stator rotates, the multi-tooth structure on the stator teeth changes periodically along the axial direction, which will stack the stator slots into inclined slots, thereby weakening the tooth harmonic electromagnetic torque, reducing motor noise, improving motor efficiency, extending motor life, and reducing maintenance costs.

[0008] Preferably, the outer circular surface of the rotor is configured as a regular multi-arc structure, and the outer circular arc surface of the rotor and the inner circular arc surface of the rotor form an eccentric structure.

[0009] By adopting the above technical solution, the eccentric structure design makes the air gap between the stator and rotor unevenly distributed, and the convex magnetic pole arc surface on the outer circle of the rotor is not concentric with the inner hole of the stator. The interaction surface between the outer circle of the rotor and the inner circle of the stator is changed to the interaction between the highest line of the rotor magnetic pole arc surface and the inner circle of the stator, which reduces the actual interaction area and greatly reduces the static adsorption force, thereby reducing vibration and noise.

[0010] Preferably, the rotor end face is provided with a plurality of relief holes, which are located in the non-magnetic pole region of the rotor.

[0011] By adopting the above technical solution, reducing the amount of material in the holes can reduce the weight of the motor. At the same time, reducing the amount of material in the holes can improve airflow and thus improve heat dissipation efficiency.

[0012] Preferably, a first cooling channel is provided on the outer wall surface of the stator, and a second cooling channel is provided on the inner wall of the housing. Both the first and second cooling channels are spiral-shaped. A cooling pipe is provided in the first cooling channel, and the cooling pipe abuts against the surface of the stator. Both ends of the cooling pipe pass through the outer wall of the housing and are connected to the cooling device.

[0013] By adopting the above technical solution, the external cooling device can cool the stator surface by inputting cooling medium into the cooling pipe. The spiral flow channel on the stator surface enhances convective heat transfer, thereby improving the heat dissipation effect and reducing the increase in electromagnetic noise caused by the expansion of the iron core and reduction of the air gap due to the increase in temperature of the stator winding.

[0014] Preferably, the two ends of the housing are provided with a plurality of air inlets and a plurality of air outlets, a cooling fan is provided inside the housing, the cooling fan is rotatably disposed inside the housing near one end of the air outlet, the cooling fan is fixedly sleeved on the rotating shaft, and a dust reduction mechanism for reducing dust is provided on the housing.

[0015] By adopting the above technical solution, when the motor starts, the rotating shaft drives the cooling fan to rotate. The rotation of the cooling fan accelerates the air circulation inside the motor, thereby speeding up the heat dissipation from the stator and rotor surfaces. The dust reduction mechanism can reduce the amount of dust in the air entering the motor, thereby preventing it from adhering to the inner wall of the stator and the surface of the rotor and affecting heat dissipation. It also prevents dust from adhering to the rotor surface and causing dynamic balance damage, vibration and noise, thereby improving motor performance.

[0016] Preferably, the dust suppression mechanism includes a collar and a filter screen. The rotating shaft passes through the middle of the filter screen, and the filter screen covers one end of the housing and blocks the air inlet. The collar is sleeved on the side wall of the housing containing the air inlet and presses and fixes the filter screen. A baffle is rotatably arranged inside the housing at the air outlet end. The baffle abuts against the inner wall of the housing end face. The baffle has multiple through holes, and the multiple through holes are connected to the multiple air outlets one by one. The dust suppression mechanism also includes a rotating assembly that drives the baffle to rotate to seal the air outlet.

[0017] By adopting the above technical solution, a filter screen is installed at the air inlet to filter dust and other particles in the air entering the inlet, thereby reducing the amount of dust entering the motor. When the motor starts, the through hole on the baffle is connected to the air outlet to discharge the hot air from inside the motor. When the motor stops running, the baffle rotates under the action of the rotating component to misalign the through hole with the air outlet, thereby sealing the air outlet and preventing external dust from entering the motor through the air outlet.

[0018] Preferably, the rotating assembly includes a first sleeve and a push block. One end of the first sleeve is fixedly connected to the center of the baffle plate. The first sleeve is sleeved on the rotating shaft. The push block is connected to the rotating shaft. An abutment is connected to the inner wall of the first sleeve, and the push block abuts against the abutment. The dust-reducing mechanism further includes a limiting assembly for limiting the rotation range of the baffle plate and a resetting assembly for resetting the baffle plate.

[0019] By adopting the above technical solution, when the motor starts and the shaft rotates, the shaft rotation drives the push block on it to rotate. The push block rotates and abuts against the stop block and pushes the stop block to rotate. The stop block rotates and drives the first sleeve to rotate. The first sleeve rotates and drives the cover plate to rotate. Under the action of the limiting component, after the through hole on the cover plate is aligned with the air outlet, the stop block moves away from the push block and the position of the stop block is fixed, so that the air outlet is kept open. When the shaft stops rotating, the first sleeve drives the cover plate to rotate in the opposite direction under the action of the reset component, so that the through hole and the air outlet are misaligned and the air outlet is blocked and closed.

[0020] Preferably, the limiting component includes a second sleeve and a miniature electromagnet. The second sleeve is sleeved outside the first sleeve. A support rod is fixedly connected between the second sleeve and the inner wall of the housing. A limiting groove is formed on the second sleeve, and the abutment rotates within the limiting groove. The first sleeve has a sliding groove, the abutment is slidably connected to the inner wall of the sliding groove, the inner wall of the sliding groove has a limiting groove, a limiting block is fixedly sleeved on the abutment, the limiting block slides in the limiting groove, a first spring is sleeved on the abutment, the two ends of the first spring are respectively connected to the side wall of the limiting block and the inner wall of the limiting groove; the inner wall of the limiting groove that is opposite to and abuts the end face of the abutment is inclined, so that the depth of the limiting groove gradually increases; The miniature electromagnet is disposed deep within the limiting groove, the circuit of the miniature electromagnet is connected to the circuit of the motor, and the miniature electromagnet cooperates with the stop block.

[0021] By adopting the above technical solution, the limiting groove can limit the movement range of the abutment. The opening angle of the limiting groove is matched with the rotation angle of the cover plate. Under the elastic force of the first spring, the abutment always abuts against the inner wall of the limiting groove. As the abutment rotates with the push block, the abutment gradually moves towards the limiting groove under the push force of the first spring. When the abutment rotates to the end of the limiting groove, the end of the abutment near the push block is completely hidden in the slide groove, and the end of the abutment away from the push block is connected to the miniature electromagnet under the action of magnetic force. When the motor runs, the shaft rotates, the miniature electromagnet circuit is connected to the magnetic attraction force. When the motor stops running, the shaft stops rotating, and the magnetic attraction force of the miniature electromagnet disappears, which is conducive to the reset component driving the cover plate to reset.

[0022] Preferably, the reset assembly includes a coil spring and a second spring. The coil spring is sleeved on the outside of the first sleeve, and its two ends are respectively connected to the outer wall of the first sleeve and the inner wall of the second sleeve. A centrifugal groove is formed on the rotating shaft, and the push block slides in the centrifugal groove. The second spring is disposed in the centrifugal groove, and its two ends are respectively connected to the push block and the inner wall of the centrifugal groove. A limiting groove is formed on the inner wall of the centrifugal groove, and a limiting block is fixedly connected to the push block. The limiting block is slidably connected in the limiting groove.

[0023] By adopting the above technical solution, when the shaft rotates, the push block moves out of the centrifugal tank under the action of centrifugal force and extends out of the centrifugal tank to abut against the stop block. The abutment between the limiting block and the limiting tank prevents the push block from being thrown out of the centrifugal tank. When the motor stops running, the centrifugal force disappears, and the push block is completely inside the centrifugal tank under the pull of the second spring, so as to avoid affecting the reset of the first sleeve. The first sleeve is reset by rotating in the opposite direction under the drive of the coil spring.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. When the stator rotates, the multi-tooth structure on the stator teeth changes periodically along the axial direction, which will stack the stator slots into inclined slots to weaken the tooth harmonic electromagnetic torque, reduce motor noise, improve motor efficiency, extend motor life and reduce maintenance costs. 2. Lightening the perforation can reduce material usage, thereby reducing motor weight. At the same time, lightening the perforation can improve airflow, thus improving heat dissipation efficiency. 3. When the motor starts, the shaft rotates, driving the cooling fan to rotate. The rotation of the cooling fan accelerates the airflow inside the motor, thereby speeding up the heat dissipation from the stator and rotor surfaces. The dust removal mechanism can reduce the amount of dust in the air entering the motor, thus preventing it from adhering to the inner wall of the stator and the surface of the rotor and affecting heat dissipation. It also prevents dust from adhering to the rotor surface, which could cause dynamic imbalance, vibration, and noise, thereby improving motor performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the motor in an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the motor in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the structure of the stator slot in the embodiment of this application.

[0028] Figure 4 This is a schematic diagram of the multi-arc structure of the rotor in the embodiment of this application.

[0029] Figure 5 This is a schematic diagram of the structure of the prominent support rod in the embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the structure of the prominent rotating component in the embodiments of this application.

[0031] Explanation of reference numerals in the attached figures: 1. Stator; 2. Rotor; 3. Shaft; 4. Housing; 5. Stator teeth; 6. Stator slot; 7. Protrusion; 8. Lightening hole; 9. First cooling channel; 10. Second cooling channel; 11. Cooling pipe; 12. Air inlet; 13. Air outlet; 14. Radiator fan; 15. Dust reduction mechanism; 16. Collar; 17. Filter screen; 18. Sheath; 19. Through hole; 20. Rotating assembly; 21. First sleeve; 22. Push block; 23. Abutment block; 24. Limiting assembly; 25. Reset assembly; 26. Second sleeve; 27. Miniature electromagnet; 28. Support rod; 29. ​​Limiting groove; 30. Sliding groove; 31. Limiting groove; 32. Limiting block; 33. First spring; 34. Coil spring; 35. Second spring; 36. Centrifugal tank; 37. Limiting groove; 38. Limiting block; 39. Stator lamination. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] This application discloses a high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor, such as... Figure 1 and Figure 2 As shown, the assembly includes a stator 1, stator windings, a rotor 2, rotor windings, a shaft 3, and a housing 4. The shaft 3 passes through the rotor 2 to support it, and the rotor 2 rotates within the stator 1. The stator 1 is fixedly connected to the housing 4, and one end of the shaft 3 passes through the housing 4 to connect to the outside. Multiple air inlets 12 and multiple air outlets 13 are respectively provided on both ends of the housing 4. The multiple air outlets 13 are evenly distributed around the center of the end faces of the housing 4. A cooling fan 14 is installed inside the housing 4 near the air outlets 13, and the cooling fan 14 is fixedly mounted on the shaft 3. A dust-reducing mechanism 15 is installed inside the housing 4 to reduce dust.

[0034] like Figure 2 As shown, the dust suppression mechanism 15 reduces the amount of airborne dust entering the motor, thus preventing it from adhering to the inner wall of the stator 1 and the surface of the rotor 2, affecting heat dissipation, and preventing dust from adhering to the surface of the rotor 2, causing dynamic imbalance, vibration, and noise, thereby improving motor performance. Simultaneously, the rotation of the shaft 3 drives the cooling fan 14 to rotate, accelerating airflow inside the motor, thereby speeding up heat dissipation from the surfaces of the stator 1 and rotor 2, and reducing the increase in electromagnetic noise caused by the expansion of the iron core and reduction of the air gap due to temperature rise in the stator windings.

[0035] like Figure 3 As shown, the stator 1 is composed of multiple stator laminations 39 stacked together. The stator laminations 39 are annular, and the inner walls of the stator laminations 39 are provided with multiple protrusions and multiple grooves. The multiple protrusions and multiple grooves are evenly distributed on the stator laminations 39 and are staggered with each other. The multiple stator laminations 39 stacked together form stator slots 6 and stator teeth 5. The ends of the stator teeth 6 are provided with protrusions 7. The stator teeth 5 on the multiple stator laminations 39 are not completely aligned. The stator teeth 5 on two adjacent stator laminations 39 are slightly offset, and are offset in one direction. At this time, the protrusions 7 on the multiple stator teeth 5 form a multi-tooth structure. The stator slots 6 are slightly tilted to follow the position of the stator laminations 39, which increases the frequency of magnetic permeability change, disperses harmonic energy to a wider frequency band, and makes the air gap magnetic flux density present a "wave-shaped" distribution along the axial direction. This disperses the single harmonic energy to multiple frequency bands, reduces the amplitude at a specific frequency, weakens the harmonics in the air gap magnetic flux density, and reduces noise.

[0036] like Figure 4As shown, the outer circular surface of rotor 2 is configured as a regular multi-arc structure. In this application, it is configured as three arcs. There is an eccentricity between the center of the outer arc surface of rotor 2 and the center of the inner circle of rotor 2. The design of the eccentric structure makes the air gap between stator 1 and rotor 2 unevenly distributed. The protruding magnetic pole arc surface on the outer circle of rotor 2 is also not concentric with the inner hole of stator 1. The original interaction surface between the outer circular surface of rotor 2 and the inner circular surface of stator 1 is changed to the interaction between the highest line of the magnetic pole arc surface of rotor 2 and the inner circular surface of stator 1, which reduces the actual interaction area and greatly reduces the static adsorption force, thereby reducing vibration and noise.

[0037] like Figure 4 As shown, multiple weight-reducing holes 8 are provided on the end face of the rotor 2, and the weight-reducing holes 8 are located in the non-magnetic pole region of the rotor 2. The weight-reducing holes 8 can not only reduce the amount of material and the weight of the motor, but also improve the airflow and thus improve the heat dissipation efficiency.

[0038] like Figure 2 As shown, a first cooling channel 9 is provided on the outer wall surface of the stator 1, and a second cooling channel 10 is provided on the inner wall of the housing 4. Both the first cooling channel 9 and the second cooling channel 10 are spiral-shaped, which can enhance convective heat transfer on the surface of the stator 1, thereby improving the heat dissipation effect. A cooling pipe 11 is provided in the second cooling channel 10, and both ends of the cooling pipe 11 extend out of the outer wall of the housing 4 and are connected to a cooling device. The external cooling device can improve the heat dissipation and cooling effect on the surface of the stator 1 by introducing a cooling medium into the cooling pipe 11.

[0039] like Figure 2 and Figure 5 As shown, the dust collection mechanism 15 includes a collar 16 and a filter screen 17. The rotating shaft 3 passes through the center of the filter screen, and the periphery of the filter screen 17 covers one end of the housing 4 and blocks the air inlet 12. The collar 16 is fitted onto the outer peripheral side wall of the end of the housing 4 containing the air inlet 12 and presses and fixes the filter screen 17, thereby fixing the filter screen 17 and facilitating its removal and replacement. A baffle plate 18 is rotatably provided inside the housing 4 at the end of the air outlet 13. The baffle plate 18 has a circular cross-section and is relatively thin. The baffle plate 18 abuts against the inner wall of the end face inside the housing 4 and blocks the air outlet 13. The baffle plate 18 has multiple through holes 19, which correspond one-to-one with the positions of the multiple air outlets 13. The dust collection mechanism 15 also includes a rotating assembly 20 that drives the baffle plate 18 to rotate to seal the air outlet 13.

[0040] like Figure 5 and Figure 6As shown, the rotating assembly 20 includes a first sleeve 21 and a pusher block 22. The first sleeve 21 is horizontally positioned and fixedly welded to the center of the baffle plate 18. The rotating shaft 3 passes through the cooling fan 14 and is inserted into the first sleeve 21. The pusher block 22 is connected to the rotating shaft 3. A stop block 23 is connected to the inner wall of the first sleeve 21. The pusher block 22 abuts against the stop block 23. When the rotating shaft 3 rotates, the pusher block 22 abuts against the stop block 23, thereby pushing the first sleeve 21 to rotate, which in turn drives the baffle plate 18 to rotate. This allows the through hole 19 and the air outlet 13 to be aligned, enabling airflow inside the motor.

[0041] like Figure 5 and Figure 6 As shown, the dust collection mechanism 15 also includes a limiting component 24 that restricts the rotation range of the baffle 18 and a resetting component 25 that enables the baffle 18 to reset. The limiting component 24 includes a second sleeve 26 and a miniature electromagnet 27. The second sleeve 26 is sleeved on the outer wall of the first sleeve 21. A support rod 28 is fixedly welded between the second sleeve 26 and the inner wall of the housing 4. The support rod 28 fixes the position of the second sleeve 26 and provides support. The second sleeve 26 can fix and support the position of the first sleeve 21. A limiting groove 29 is formed on the inner wall of the second sleeve 26 close to the outer wall of the first sleeve 21. The abutment 23 passes through the first sleeve 21, and its end away from the rotating shaft 3 rotates within the limiting groove 29. The limiting groove 29 can limit the rotation angle of the baffle 18.

[0042] like Figure 6 As shown, a sliding groove is provided inside the first sleeve 21, and the abutment 23 passes through and is slidably connected to the inner wall of the sliding groove. A limiting groove 31 is provided on the inner wall of the sliding groove. A limiting block 32 is fixedly sleeved on the abutment 23. The limiting block 32 slides in the limiting groove 31. A first spring 33 is sleeved on the abutment 23. The two ends of the first spring 33 are respectively connected to the side wall of the limiting block 32 and the inner wall of the limiting groove 31. In its natural state, the first spring 33 makes the end of the abutment 23 near the rotating shaft 3 completely inside the sliding groove 30.

[0043] like Figure 5 and Figure 6 As shown, when the baffle 18 closes the vent 13, the abutment 23, against the inner wall of the limiting groove 29, causes the limiting block 32 to stretch the first spring 33. The inner wall of the limiting groove 29, which is opposite to the end face of the abutment 23, is inclined, so that the depth of the limiting groove 29 gradually increases. The miniature electromagnet 27 is located deep in the limiting groove 29 and cooperates with the end of the abutment 23. The circuit of the miniature electromagnet 27 is connected to the circuit of the motor. When the shaft 3 rotates, the circuit is connected, and the miniature electromagnet 27 has magnetic force. When the shaft 3 stops, the circuit is disconnected, and the magnetic force of the miniature electromagnet 27 disappears.

[0044] like Figure 6As shown, the reset assembly 25 includes a coil spring 34 and a second spring 35. The coil spring 34 is sleeved on the outer wall of the first sleeve 21, and its two ends are fixedly connected to the outer wall of the first sleeve 21 and the inner wall of the second sleeve 26, respectively. The rotating shaft 3 has a centrifugal groove 36 perpendicular to the axis. The push block 22 slides in the centrifugal groove 36. The second spring 35 is provided in the centrifugal groove 36, and its two ends are fixedly welded to the push block 22 and the inner wall of the centrifugal groove 36, respectively. A limiting groove 37 is provided in the inner wall of the centrifugal groove 36. A limiting block 38 is fixedly welded to the push block 22 and slides in the limiting groove 37, thereby preventing the push block 22 from being thrown out under the action of centrifugal force. The magnetic field range of the miniature electromagnet 27 is small and does not affect the magnetic field in the stator 1. The abutment 23 is only magnetic at the end near the miniature electromagnet 27. The magnetic force between the miniature electromagnet 27 and the abutment 23 can only overcome the elastic force of the coil spring 34.

[0045] like Figure 2 As shown, a filter 17 is installed at the air inlet 12 to filter dust and other particles in the air entering the inlet, thereby reducing the amount of dust entering the motor. Before the motor runs, the through hole 19 on the baffle 18 is offset from the air outlet 13, and the side wall of the baffle 18 blocks the air outlet 13 to prevent dust and other particles in the outside air from entering the motor through the air outlet 13.

[0046] like Figure 2 and Figure 6 As shown, when the motor is running, the shaft 3 rotates, the circuit of the miniature electromagnet 27 is connected, and it becomes magnetic. The rotating shaft 3 rotates, and the push block 22 on it stretches the second spring 35 under the action of centrifugal force, moving it to extend out of the centrifugal groove 36. The push block 22 protrudes from the centrifugal groove 36 and can abut against the abutment block 23. Through the abutment block 23, the first sleeve 21 is driven to rotate against the coil spring 34. The rotation of the first sleeve 21 drives the baffle 18 to rotate, thereby aligning the through hole 19 on the baffle 18 with the air outlet 13, allowing air to circulate inside the motor.

[0047] like Figure 6 As shown, the limiting groove 29 restricts the movement range of the abutment 23. When the abutment 23 moves from the shallow end to the deep end of the limiting groove 29, the abutment 23 remains in contact with the inner wall of the limiting groove 29 under the elastic force of the first spring 33 at its end, and finally connects with the miniature electromagnet 27, thereby fixing the position of the first sleeve 21. The setting of the limiting groove 29 from shallow to deep allows the abutment 23 to move away from the push block 22 after the vent 13 is opened, avoiding affecting the rotation of the rotating shaft 3. The angle corresponding to the limiting groove 29 matches the rotation angle of the cover plate 18, ensuring that the through hole 19 is aligned with the vent 13 and that the vent 13 is completely blocked.

[0048] like Figure 6As shown, when the motor stops running, the shaft 3 stops rotating, the magnetic attraction of the miniature electromagnet 27 disappears, the pulling force on the stop block 23 disappears, the first sleeve 21 reverses and resets under the action of the coil spring 34, and the stop block 23 moves from the deep to the shallow direction from the limiting groove 29. The inner wall of the limiting groove 29 pushes the stop block 23 to stretch the first spring 33 and move it towards the shaft 3. After the shaft 3 stops, the push block 22 is completely within the centrifugal groove 36 under the elastic force of the second spring 35, thereby avoiding obstructing the reverse reset of the stop block 23.

[0049] The implementation principle of this application embodiment is as follows: By designing the stator 1 with a multi-tooth structure, harmonics in the air gap magnetic flux are weakened, reducing noise. The outer circular surface of the rotor 2 is designed with a regular multi-arc structure, resulting in an uneven distribution of the air gap between the stator and rotor 2, reducing the actual effective area and greatly reducing static adsorption force, thereby reducing vibration and noise. Furthermore, the external cooling device, including the cooling fan 14, the second cooling channel, and the cooling pipe 11, enhances heat dissipation, reducing the increase in electromagnetic noise caused by core expansion and air gap reduction due to temperature rise. The dust removal mechanism 15 reduces dust from entering the motor and adhering to the surfaces of the stator 1 and rotor 2, preventing dynamic imbalance, vibration, and noise generation, thus reducing motor noise and improving motor performance.

[0050] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-frequency sinusoidal high starting torque permanent magnet synchronous motor, comprising a stator (1), a rotor (2), a shaft (3), and a housing (4), wherein the shaft (3) passes through the rotor (2) to support the rotor (2), the rotor (2) rotates within the stator (1), and the stator (1) is fixedly connected to the housing (4); the inner wall of the stator (1) is provided with stator teeth (5) and stator slots (6), the stator teeth (5) and the stator slots (6) are staggered, the stator teeth (5) are multi-toothed along the length extension direction of the stator (1), and the stator slots (6) are slightly inclined along the length direction of the stator (1); The two ends of the housing (4) are respectively provided with a plurality of air inlets (12) and a plurality of air outlets (13). A cooling fan (14) is provided inside the housing (4). The cooling fan (14) is rotatably disposed inside the housing (4) near the air outlet (13). The cooling fan (14) is fixedly sleeved on the rotating shaft (3). A dust reduction mechanism (15) for reducing dust is provided on the housing (4). The dust suppression mechanism (15) includes a collar (16) and a filter screen (17). The rotating shaft (3) passes through the middle of the filter screen (17). The filter screen (17) covers one end of the housing (4) and blocks the air inlet (12). The collar (16) is sleeved on the side wall of the housing (4) containing the air inlet (12) and presses and fixes the filter screen (17). A baffle plate (18) is rotatably arranged inside the housing (4) at the end of the air outlet (13). The baffle plate (18) abuts against the inner wall of the end face of the housing (4). The baffle plate (18) has multiple through holes (19). The multiple through holes (19) are connected to the multiple air outlets (13) one by one. The dust suppression mechanism (15) also includes a rotating assembly (20) that drives the baffle plate (18) to rotate to seal the air outlet (13). The rotating assembly (20) includes a first sleeve (21) and a push block (22). One end of the first sleeve (21) is fixedly connected to the center of the baffle (18). The first sleeve (21) is sleeved on the rotating shaft (3). The push block (22) is connected to the rotating shaft (3). A stop block (23) is connected to the inner wall of the first sleeve (21). The push block (22) abuts against the stop block (23). The dust removal mechanism (15) also includes a limiting assembly (24) that limits the rotation range of the baffle (18) and a reset assembly (25) that resets the baffle (18). The limiting component (24) includes a second sleeve (26) and a miniature electromagnet (27). The second sleeve (26) is sleeved on the outer wall of the first sleeve (21). A support rod (28) is fixedly connected between the second sleeve (26) and the inner wall of the housing (4). A limiting groove (29) is opened on the second sleeve (26). The abutment (23) rotates in the limiting groove (29). The first sleeve (21) has a sliding groove, the abutment (23) is slidably connected to the inner wall of the sliding groove, the inner wall of the sliding groove has a limiting groove (31), a limiting block (32) is fixedly sleeved on the abutment (23), the limiting block (32) slides in the limiting groove (31), a first spring (33) is sleeved on the abutment (23), the two ends of the first spring (33) are respectively connected to the side wall of the limiting block (32) and the inner wall of the limiting groove (31); the inner wall of the limiting groove (29) that is opposite to and abuts the end face of the abutment (23) is inclined, so that the depth of the limiting groove (29) gradually increases; The miniature electromagnet (27) is disposed deep in the limiting groove (29), the circuit of the miniature electromagnet (27) is connected to the circuit of the motor, and the miniature electromagnet (27) cooperates with the abutment (23). The reset assembly (25) includes a coil spring (34) and a second spring (35). The coil spring (34) is sleeved on the outside of the first sleeve (21), and its two ends are respectively connected to the outer wall of the first sleeve (21) and the inner wall of the second sleeve (26). A centrifugal groove (36) is opened on the rotating shaft (3). The push block (22) slides in the centrifugal groove (36). The second spring (35) is set in the centrifugal groove (36). The two ends of the second spring (35) are respectively connected to the push block (22) and the inner wall of the centrifugal groove (36). A limiting groove (37) is opened on the inner wall of the centrifugal groove (36). A limiting block (38) is fixedly connected to the push block (22). The limiting block (38) is slidably connected in the limiting groove (37).

2. The high-frequency sinusoidal high-starting-torque permanent magnet synchronous motor according to claim 1, characterized in that: The outer circular surface of the rotor (2) is configured as a regular multi-arc structure, and the outer circular arc surface of the rotor (2) and the inner circular arc surface of the rotor (2) form an eccentric structure.

3. The high-frequency sinusoidal high starting torque permanent magnet synchronous motor according to claim 1, characterized in that: The rotor (2) has a plurality of light-reducing holes (8) on its end face, and the light-reducing holes (8) are located in the non-magnetic pole region of the rotor (2).

4. The high-frequency sinusoidal high starting torque permanent magnet synchronous motor according to claim 1, characterized in that: The stator (1) has a first cooling channel (9) on its outer side wall surface and a second cooling channel (10) on the inner wall of the housing (4). Both the first cooling channel (9) and the second cooling channel (10) are spiral-shaped. A cooling pipe (11) is provided in the first cooling channel (9). Both ends of the cooling pipe (11) pass through the outer wall of the housing (4) and are connected to the cooling device.

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