Permanent magnet synchronous motor and rotor assembly thereof

Abstract

The rotor assembly comprises a rotating shaft, a permanent magnet rotor and an adjusting mechanism, the permanent magnet rotor is used for being arranged between a motor stator and the rotating shaft, and the permanent magnet rotor is connected to the rotating shaft through the adjusting mechanism and can drive the rotating shaft to rotate. The adjusting mechanism can drive the permanent magnet rotor to move in the radial direction of the rotating shaft so that the permanent magnet rotor can be close to or away from the motor stator. According to the permanent magnet synchronous motor provided by the invention, the distance between the permanent magnet rotor and the motor stator is adjustable, so that different loads can be well driven, and the permanent magnet synchronous motor can well replace an asynchronous motor and a speed reducer to serve as a driving device of a coal mill.

Description

Technical Field

[0001] The present disclosure relates to the technical field of permanent magnet synchronous motors, and in particular, to a permanent magnet synchronous motor and a rotor assembly thereof. Background Art

[0002] Coal mills are widely used in thermal power plants and industrial coal powder preparation to grind coal blocks into fine powder for more efficient combustion. The drive system of the coal mill mainly relies on asynchronous motors and reducers, which reduce the high-speed motor speed to a speed range suitable for the coal mill. However, asynchronous motors have disadvantages such as low power factor, large size, and easy mechanical wear. The presence of reducers slows down the response speed of the entire system, affecting the dynamic performance of the coal mill. In view of this, the industry is considering using permanent magnet synchronous motors with advantages in efficiency, power factor and control accuracy to replace asynchronous motors and reducers.

[0003] In the prior art, the distance between the stator and the rotor of the permanent magnet synchronous motor is not adjustable, and the coal mill has a variety of working conditions, so that the permanent magnet synchronous motor needs to drive loads with large differences. Therefore, directly using the existing permanent magnet synchronous motor to replace the asynchronous motor and the reducer will have the following problems: When the load increases, in order to ensure that the speed remains unchanged, the permanent magnet synchronous motor needs to generate a larger electromagnetic force to drive the load, which will generate more heat, causing the stator and rotor to expand due to heat, and then causing the distance between the stator and the rotor to decrease. In addition, the increase in load will also cause the vibration of the permanent magnet synchronous motor to intensify, causing the distance between the stator and the rotor to change periodically, thereby greatly increasing the risk of friction between the stator and the rotor. The size of the distance between the stator and the rotor is inversely proportional to the efficiency of the permanent magnet synchronous motor. When the load decreases, the distance between the stator and the rotor is too large, which will cause the efficiency of the permanent magnet synchronous motor to decrease. Summary of the invention

[0004] The purpose of the present disclosure is to provide a permanent magnet synchronous motor and a rotor assembly thereof to solve the above technical problems.

[0005] In order to achieve the above object, according to one aspect of the present disclosure, a rotor assembly of a permanent magnet synchronous motor is provided, comprising: Rotating shaft; A permanent magnet rotor, used to be arranged between the motor stator and the rotating shaft; The adjusting mechanism is used to connect the permanent magnet rotor to the rotating shaft and can drive the rotating shaft to rotate. The adjusting mechanism is configured to drive the permanent magnet rotor to move radially along the rotating shaft so that the permanent magnet rotor can move closer to or farther from the motor stator.

[0006] Optionally, the adjustment mechanism includes an adjustment rod, a first moving member, a second moving member, a first connecting member, a second connecting member and a mounting plate; The adjusting rod is passed through the rotating shaft, the first moving member and the second moving member are spaced apart along the axial direction of the rotating shaft and installed on the adjusting rod, and the adjusting rod can make the first moving member and the second moving member move toward or away from each other along the axial direction of the rotating shaft; The rotating shaft is formed with a long guide hole extending along the axial direction of the rotating shaft, and part of the first moving member and part of the second moving member can be movably arranged in the long guide hole; The first end of the first connecting member and the first end of the second connecting member are both hinged to the mounting plate, and the second end of the first connecting member and the second end of the second connecting member are hinged to the first moving member and the second moving member respectively; The permanent magnet rotor is mounted on a side of the mounting plate away from the rotating shaft.

[0007] Optionally, the adjusting rod is capable of rotating relative to the rotating shaft, and a first thread and a second thread are formed on the adjusting rod, the thread rotation direction of the first thread is opposite to the thread rotation direction of the second thread, the first moving member is connected to the first thread and forms a screw nut pair, and the second moving member is connected to the second thread and forms a screw nut pair.

[0008] Optionally, the first end of the rotating shaft is used to extend outside the motor housing, the first end of the adjusting rod extends from the first end of the rotating shaft and forms an annular operating part, an indicating block is arranged on the outer circumference of the annular operating part, and a scale is arranged on the outer circumference of the first end of the rotating shaft.

[0009] Optionally, there are multiple permanent magnet rotors, and the multiple permanent magnet rotors are arranged at circumferential intervals along the rotating shaft. There are multiple first connecting members and multiple second connecting members, and the multiple first connecting members, multiple second connecting members and multiple permanent magnet rotors are arranged in one-to-one correspondence. The multiple first connecting members are hinged to the same first moving member, and the multiple second connecting members are hinged to the same second moving member.

[0010] Optionally, the rotor assembly further comprises a guide plate and a coil, an air inlet slot is formed on a side of the permanent magnet rotor away from the rotating shaft, the guide plate is mounted on the permanent magnet rotor and located at a notch of the air inlet slot, and the guide plate is used to guide airflow into the air inlet slot when the permanent magnet rotor rotates; A ventilation hole is formed on the permanent magnet rotor, and the ventilation hole is communicated with the air inlet slot; The coil is wound around the permanent magnet rotor, and the coil bypasses an outer wall of the permanent magnet rotor on which the ventilation hole is formed.

[0011] Optionally, the ventilation holes are formed on opposite sides of the permanent magnet rotor; The rotor assembly also includes a diverter block arranged in the air inlet slot, the cross-section of the diverter block is constructed as an isosceles triangle, the tip of the isosceles triangle faces the notch of the air inlet slot, and the two waists of the isosceles triangle face the ventilation holes on both sides of the permanent magnet rotor respectively.

[0012] According to another aspect of the present disclosure, a permanent magnet synchronous motor is provided, comprising a motor housing, a motor stator and the above-mentioned rotor assembly.

[0013] Optionally, the permanent magnet synchronous motor further comprises a dustproof net arranged in the motor casing, the dustproof net divides the interior of the motor casing into a first chamber and a second chamber, an air inlet and an ash discharge port are formed on the motor casing, the air inlet and the ash discharge port are both communicated with the first chamber, the ash discharge port is located at the bottom of the first chamber, and the permanent magnet rotor, the adjustment mechanism and the motor stator are all arranged in the second chamber; The permanent magnet synchronous motor further includes a cleaning brush disposed in the first chamber, wherein the cleaning brush is connected to the rotating shaft and can contact the surface of the dustproof net.

[0014] Optionally, the permanent magnet synchronous motor further comprises a bracket, a guide rod and a spring arranged in the first chamber; The bracket is connected to the rotating shaft, a guide hole is formed on the bracket, one end of the guide rod is connected to the cleaning brush, the other end of the guide rod is movably inserted into the guide hole, the spring is sleeved on the guide rod, one end of the spring is connected to the cleaning brush, and the other end of the spring is connected to the bracket.

[0015] Through the above technical solution, since the adjustment mechanism can drive the permanent magnet rotor to move radially along the rotating shaft, the staff can adjust the distance between the permanent magnet rotor and the motor stator to a suitable distance through the adjustment mechanism according to the different loads that the permanent magnet synchronous motor needs to drive. For example, when the permanent magnet synchronous motor needs to drive a larger load, the distance between the permanent magnet rotor and the motor stator can be increased, thereby eliminating the influence of thermal expansion and increased vibration, and avoiding friction or collision between the permanent magnet rotor and the motor stator. When the permanent magnet synchronous motor needs to drive a smaller load, the distance between the permanent magnet rotor and the motor stator can be reduced, thereby avoiding the distance between the permanent magnet rotor and the motor stator being too large, which leads to a decrease in the efficiency of the permanent magnet synchronous motor.

[0016] In summary, compared with the permanent magnet synchronous motor in the prior art, the permanent magnet synchronous motor provided by the present invention has an adjustable distance between the permanent magnet rotor and the motor stator, so that it can drive different loads well, and can further replace the asynchronous motor and the reducer as the driving device of the coal mill.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a three-dimensional diagram of a permanent magnet synchronous motor provided by an embodiment of the present disclosure, wherein a portion of the motor housing is cut away; Figure 2 is a partial stereoscopic diagram of a permanent magnet synchronous motor provided by an embodiment of the present disclosure; Figure 3 is a three-dimensional diagram of a rotor assembly provided by an embodiment of the present disclosure, wherein the permanent magnet rotor is not shown; Figure 4 It is an exploded view of a permanent magnet rotor, a guide plate, a shunt block, a coil, and a mounting plate of a rotor assembly provided in one embodiment of the present disclosure; Figure 5 It is an exploded view of a dust screen, a cleaning brush and a bracket of a permanent magnet synchronous motor provided in one embodiment of the present disclosure.

[0019] Description of Reference Numerals 100-permanent magnet synchronous motor; 110-rotor assembly; 10-rotating shaft; 11-guide long hole; 12-scale; 20-permanent magnet rotor; 21-air inlet slot; 22-ventilation hole; 30-adjusting mechanism; 31-adjusting rod; 32-first moving member; 33-second moving member; 34-first connecting member; 35-second connecting member; 36-mounting plate; 37-first thread; 38-second thread; 39-annular operating part; 391-indicator block; 40-guide plate; 50-coil; 60-shunt block; 120-motor stator; 130-motor housing; 131-air inlet; 132-ash outlet; 140-dustproof net; 151-first chamber; 152-second chamber; 160-cleaning brush; 170-bracket; 171-guide hole; 180-guide rod; 190-spring. DETAILED DESCRIPTION

[0020] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0021] In the present disclosure, unless otherwise stated, the directional words used, such as "upper, lower, top, and bottom", are usually defined by the upper, lower, top, and bottom of the permanent magnet synchronous motor in normal use, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore cannot be understood as a limitation of the present disclosure. "Inside and outside" refer to the inside and outside of the corresponding component contour. In addition, the terms "first", "second", etc., are used to distinguish one element from another, and do not have order and importance.

[0022] In the description of the present disclosure, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "connected", and "installed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0023] like Figures 1 to 5 As shown, according to one aspect of the present disclosure, a rotor assembly 110 of a permanent magnet synchronous motor 100 is provided, including a rotating shaft 10, a permanent magnet rotor 20 and an adjusting mechanism 30. The permanent magnet rotor 20 is used to be arranged between the motor stator 120 and the rotating shaft 10. The permanent magnet rotor 20 is connected to the rotating shaft 10 through the adjusting mechanism 30 and can drive the rotating shaft 10 to rotate. The adjusting mechanism 30 is configured to drive the permanent magnet rotor 20 to move radially along the rotating shaft 10 so that the permanent magnet rotor 20 can approach or move away from the motor stator 120.

[0024] Through the above technical solution, since the adjustment mechanism 30 can drive the permanent magnet rotor 20 to move radially along the rotating shaft 10, the staff can adjust the distance between the permanent magnet rotor 20 and the motor stator 120 to a suitable distance through the adjustment mechanism 30 according to the different loads that the permanent magnet synchronous motor 100 needs to drive. For example, when the permanent magnet synchronous motor 100 needs to drive a larger load, the distance between the permanent magnet rotor 20 and the motor stator 120 can be increased, thereby eliminating the influence of thermal expansion and increased vibration, and avoiding friction or collision between the permanent magnet rotor 20 and the motor stator 120. When the permanent magnet synchronous motor 100 needs to drive a smaller load, the distance between the permanent magnet rotor 20 and the motor stator 120 can be reduced, thereby avoiding the distance between the permanent magnet rotor 20 and the motor stator 120 being too large, which leads to a decrease in the efficiency of the permanent magnet synchronous motor 100.

[0025] In summary, compared with the permanent magnet synchronous motor in the prior art, the permanent magnet synchronous motor 100 provided in the present invention has an adjustable distance between the permanent magnet rotor 20 and the motor stator 120, so that it can drive different loads well, and can further replace the asynchronous motor and the reducer as the driving device of the coal mill.

[0026] It can be understood that the permanent magnet rotor 20 is a rotor including permanent magnets (or permanent magnets, or permanent magnetic materials). The permanent magnet rotor 20 generates a continuous magnetic field through the permanent magnets, and the magnetic field interacts with the coils 50 or magnets in the motor stator 120 to generate torque and drive the rotating shaft 10 to rotate.

[0027] Here, the permanent magnet synchronous motor 100 provided in the present disclosure can be used as a driving device for any equipment, not limited to a coal mill.

[0028] The present disclosure does not limit the structure of the adjustment mechanism 30. As an implementation method, Figure 3 As shown, the adjustment mechanism 30 includes an adjustment rod 31, a first movable member 32, a second movable member 33, a first connecting member 34, a second connecting member 35 and a mounting plate 36. The adjustment rod 31 is penetrated by the rotating shaft 10. The first movable member 32 and the second movable member 33 are arranged at intervals along the axial direction of the rotating shaft 10 and are installed on the adjustment rod 31. The adjustment rod 31 can make the first movable member 32 and the second movable member 33 move toward or away from each other along the axial direction of the rotating shaft 10. A guide long hole 11 extending along the axial direction of the rotating shaft 10 is formed on the rotating shaft 10. Part of the first movable member 32 and part of the second movable member 33 can be movably penetrated by the guide long hole 11. The first end of the first connecting member 34 and the first end of the second connecting member 35 are both hinged to the mounting plate 36. The second end of the first connecting member 34 and the second end of the second connecting member 35 are respectively hinged to the first movable member 32 and the second movable member 33. The permanent magnet rotor 20 is installed on the side of the mounting plate 36 away from the rotating shaft 10.

[0029] Since the first moving member 32 and the second moving member 33 are arranged at intervals along the axial direction of the rotating shaft 10, the first end of the first connecting member 34 and the first end of the second connecting member 35 are both hinged to the mounting plate 36, and the second end of the first connecting member 34 and the second end of the second connecting member 35 are respectively hinged to the first moving member 32 and the second moving member 33, therefore, when the spacing between the first moving member 32 and the second moving member 33 changes, the spacing between the mounting plate 36 and the rotating shaft 10 in the radial direction of the rotating shaft 10 will also change accordingly. For example, by driving the first moving member 32 and the second moving member 33 to move toward each other along the axial direction of the rotating shaft 10 by the adjusting rod 31, the mounting plate 36 can be moved away from the rotating shaft 10, thereby reducing the spacing between the permanent magnet rotor 20 installed on the mounting plate 36 and the motor stator 120, and by driving the first moving member 32 and the second moving member 33 to move away from each other along the axial direction of the rotating shaft 10 by the adjusting rod 31, the mounting plate 36 can be moved close to the rotating shaft 10, thereby increasing the spacing between the permanent magnet rotor 20 installed on the mounting plate 36 and the motor stator 120.

[0030] It can be understood that since part of the first movable member 32 and part of the second movable member 33 can be movably inserted into the guide long hole 11, the guide long hole 11 can guide and limit the first movable member 32 and the second movable member 33, so that the first movable member 32 and the second movable member 33 can both move axially along the rotating shaft 10 and be locked circumferentially relative to the rotating shaft 10.

[0031] Optionally, a first guide portion is provided on the first movable member 32, and a second guide portion is provided on the second movable member 33. Both the first guide portion and the second guide portion are passed through the long guide hole 11, and the hole wall of the long guide hole 11 contacts the side walls of the first guide portion and the second guide portion.

[0032] As another embodiment, the adjustment mechanism 30 may include a pneumatic telescopic rod and a mounting plate 36, wherein the pneumatic telescopic rod is extended radially along the rotating shaft 10 and one end is connected to the rotating shaft 10, and the other end of the pneumatic telescopic rod is connected to the mounting plate 36, and the permanent magnet rotor 20 is installed on the side of the mounting plate 36 away from the rotating shaft 10.

[0033] Alternatively, if Figure 3 and Figure 4 As shown, the mounting plate 36 can be constructed as an arc-shaped plate. Since the concave portion of the arc-shaped plate is more compatible with the shape of the rotating shaft 10, the mounting plate 36 constructed as an arc-shaped plate can be closer to the rotating shaft 10, which is beneficial to increase the adjustment range of the distance between the permanent magnet rotor 20 and the motor stator 120.

[0034] The present disclosure does not limit the structure of the adjustment rod 31. As an implementation method, Figure 3As shown, the adjusting rod 31 can rotate relative to the rotating shaft 10, and a first thread 37 and a second thread 38 are formed on the adjusting rod 31. The thread rotation direction of the first thread 37 is opposite to that of the second thread 38. The first moving member 32 is connected to the first thread 37 to form a screw nut pair, and the second moving member 33 is connected to the second thread 38 to form a screw nut pair. Since the thread rotation direction of the first thread 37 is opposite to that of the second thread 38, the first moving member 32 and the second moving member 33 can be moved in opposite directions, that is, moved toward or away from each other, by rotating the adjusting rod 31.

[0035] As other embodiments of the present disclosure, the adjusting rod 31 may further include a first rod and a second rod, wherein the first rod is connected to the first connecting member 34, and the second rod is connected to the second connecting member 35. The first movable member 32 and the second movable member 33 may be moved toward or away from each other by controlling the first rod and the second rod to move in opposite directions along the axial direction of the rotating shaft 10.

[0036] Since a large degree of adjustment of the working condition of the coal mill usually requires shutdown, it is optional to Figure 1 and Figure 3 As shown, the first end of the rotating shaft 10 is used to extend outside the motor housing 130, the first end of the adjusting rod 31 extends from the first end of the rotating shaft 10 and forms an annular operating part 39, an indicating block 391 is arranged on the outer circumference of the annular operating part 39, and a scale 12 is arranged on the outer circumference of the first end of the rotating shaft 10.

[0037] With such arrangement, when the permanent magnet synchronous motor 100 stops running, the staff can rotate the adjustment rod 31 through the annular operating part 39 to make the adjustment rod 31 rotate circumferentially relative to the rotating shaft 10, thereby adjusting the distance between the permanent magnet rotor 20 and the motor stator 120, and the specific value of the distance between the permanent magnet rotor 20 and the motor stator 120 can be determined by comparing the indicator block 391 on the annular operating part 39 with the scale 12 on the rotating shaft 10, thereby achieving relatively precise adjustment of the distance between the permanent magnet rotor 20 and the motor stator 120.

[0038] The above arrangement is suitable for the working conditions of the coal mill, has a simple structure and does not require the addition of additional driving equipment, is not easy to be damaged and is easy to maintain.

[0039] The present disclosure does not limit the number of permanent magnet rotors 20. As an implementation method, Figure 2 and Figure 3As shown, there are multiple permanent magnet rotors 20, and the multiple permanent magnet rotors 20 are arranged at circumferential intervals along the rotating shaft 10. There are multiple first connecting members 34 and multiple second connecting members 35. The multiple first connecting members 34, the multiple second connecting members 35 and the multiple permanent magnet rotors 20 are arranged in a one-to-one correspondence. The multiple first connecting members 34 are hinged to the same first movable member 32, and the multiple second connecting members 35 are hinged to the same second movable member 33.

[0040] The permanent magnet rotor 20 is arranged in a plurality, which is beneficial to increase the total magnetic field strength of the rotor assembly 110, thereby facilitating the improvement of the load capacity of the permanent magnet synchronous motor 100. The plurality of permanent magnet rotors 20 are arranged at intervals along the circumference of the rotating shaft 10, which is beneficial to the balance of the rotating shaft 10 during rotation, thereby reducing the vibration of the rotating shaft 10, and further facilitating the avoidance of friction between the permanent magnet rotor 20 and the motor stator 120.

[0041] For example, the first movable member 32 and the second movable member 33 can both be constructed in a "cross" shape, and the guide long holes 11 are set to be four equally spaced along the circumference of the rotating shaft 10. The four ends of the first movable member 32 and the second movable member 33 are respectively passed through the four guide long holes 11, and are respectively connected to the permanent magnet rotor 20 through corresponding connecting members and the mounting plate 36.

[0042] Alternatively, if Figure 3 As shown, the rotor assembly 110 also includes a guide plate 40 and a coil 50. An air inlet groove 21 is formed on the side of the permanent magnet rotor 20 away from the rotating shaft 10. The guide plate 40 is installed on the permanent magnet rotor 20 and is located at the notch of the air inlet groove 21. The guide plate 40 is used to guide the airflow into the air inlet groove 21 when the permanent magnet rotor 20 rotates. A ventilation hole 22 is formed on the permanent magnet rotor 20, and the ventilation hole 22 is connected to the air inlet groove 21. The coil 50 is wound on the permanent magnet rotor 20, and the coil 50 bypasses the outer wall of the permanent magnet rotor 20 where the ventilation hole 22 is formed.

[0043] Since the guide plate 40 is installed on the permanent magnet rotor 20 and is located at the slot of the air inlet slot 21, when the permanent magnet rotor 20 rotates with the rotating shaft 10, the air can be continuously introduced into the air inlet slot 21 by the guide plate 40 and then discharged from the ventilation hole 22. In this process, the slot wall of the air inlet slot 21 can play a role in increasing the heat exchange area of ​​the permanent magnet rotor 20. The air flowing through the air inlet slot 21 can exchange heat with the permanent magnet rotor 20 through the slot wall of the air inlet slot 21, which is beneficial to improve the heat dissipation capacity of the permanent magnet rotor 20, and further beneficial to reduce the influence of the heating of the permanent magnet synchronous motor 100 on the gap between the permanent magnet rotor 20 and the motor stator 120.

[0044] The coil 50 wound on the permanent magnet rotor 20 can play a role in adjusting the magnetic field strength, that is, the magnetic field strength of the rotor assembly 110 is adjusted by changing the current strength flowing through the coil 50. Since the coil 50 bypasses the outer wall of the permanent magnet rotor 20 where the ventilation hole 22 is formed, the air discharged from the ventilation hole 22 will also take away the heat of the coil 50, which is beneficial to the heat dissipation of the coil 50.

[0045] The present disclosure does not limit the structure of the guide plate 40. As an implementation method, Figure 3 As shown, the guide plate 40 can be constructed as a rectangular plate, and the notch of the air inlet slot 21 can also be constructed as a rectangle. The guide plate 40 and the notch of the air inlet slot 21 are arranged at an angle, and one end of the guide plate 40 is connected to one side of the notch of the air inlet slot 21. When the rotating shaft 10 rotates, the airflow moves along a side of the guide plate 40 close to the air inlet 131 until entering the notch of the air inlet slot 21.

[0046] Alternatively, if Figure 3 As shown, ventilation holes 22 are formed on opposite sides of the permanent magnet rotor 20, and the rotor assembly 110 further includes a shunt block 60 disposed in the air inlet slot 21. The cross-section of the shunt block 60 is an isosceles triangle, the tip of the isosceles triangle faces the notch of the air inlet slot 21, and the two waists of the isosceles triangle face the ventilation holes 22 on both sides of the permanent magnet rotor 20. The shunt block 60 can shunt the airflow flowing into the air inlet slot 21, so that it flows out of the air inlet slot 21 through the ventilation holes 22 on both sides, thereby facilitating more uniform heat dissipation at various locations of the permanent magnet rotor 20.

[0047] According to another aspect of the present disclosure, Figure 1 As shown, a permanent magnet synchronous motor 100 is provided, including a motor housing 130 , a motor stator 120 and the above-mentioned rotor assembly 110 .

[0048] Alternatively, if Figure 1 As shown, the permanent magnet synchronous motor 100 also includes a dustproof net 140 arranged in the motor casing 130, and the dustproof net 140 divides the interior of the motor casing 130 into a first chamber 151 and a second chamber 152. An air inlet 131 and an ash discharge port 132 are formed on the motor casing 130, and the air inlet 131 and the ash discharge port 132 are both connected to the first chamber 151. The ash discharge port 132 is located at the bottom of the first chamber 151, and the permanent magnet rotor 20, the adjustment mechanism 30 and the motor stator 120 are all arranged in the second chamber 152. The permanent magnet synchronous motor 100 also includes a cleaning brush 160 arranged in the first chamber 151, and the cleaning brush 160 is connected to the rotating shaft 10 and can contact the surface of the dustproof net 140.

[0049] During the operation of the permanent magnet synchronous motor 100, the outside air can enter the second chamber 152 through the air inlet 131, the first chamber 151 and the dustproof net 140 in sequence, and dissipate heat to the permanent magnet rotor 20, the adjustment mechanism 30 and the motor stator 120 in the second chamber 152. The dustproof net 140 can filter the dust in the air to prevent the dust from affecting the device in the second chamber 152. The filtered dust can fall out of the first chamber 151 from the dust discharge port 132 under the action of gravity.

[0050] Since the cleaning brush 160 is connected to the rotating shaft 10 and can contact the surface of the dustproof net 140 , the cleaning brush 160 can rotate with the rotating shaft 10 , thereby continuously cleaning the dustproof net 140 and ensuring the ventilation capacity of the dustproof net 140 .

[0051] In order to improve the cleaning effect of the cleaning brush 160 on the dustproof net 140, as an implementation method, Figure 5 As shown, the permanent magnet synchronous motor 100 also includes a bracket 170, a guide rod 180 and a spring 190 arranged in the first chamber 151, the bracket 170 is connected to the rotating shaft 10, a guide hole 171 is formed on the bracket 170, one end of the guide rod 180 is connected to the cleaning brush 160, and the other end of the guide rod 180 is movably inserted into the guide hole 171, the spring 190 is sleeved on the guide rod 180, one end of the spring 190 is connected to the cleaning brush 160, and the other end of the spring 190 is connected to the bracket 170.

[0052] Through the cooperation between the guide hole 171 and the guide rod 180, it can be ensured that the cleaning brush 160 can only move relative to the bracket 170 in the direction close to or away from the dustproof net 140. Since one end of the spring 190 is connected to the cleaning brush 160 and the other end of the spring 190 is connected to the bracket 170, the elastic force of the spring 190 can keep the cleaning brush 160 always in close fit with the dustproof net 140, which is beneficial to improve the cleaning effect of the cleaning brush 160 on the dustproof net 140.

[0053] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0054] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0055] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A rotor assembly of a permanent magnet synchronous motor, characterized in that: include: Rotating shaft; A permanent magnet rotor, used to be arranged between the motor stator and the rotating shaft; The adjusting mechanism is used to connect the permanent magnet rotor to the rotating shaft and can drive the rotating shaft to rotate. The adjusting mechanism is configured to drive the permanent magnet rotor to move radially along the rotating shaft so that the permanent magnet rotor can move closer to or farther from the motor stator.

2. The rotor assembly according to claim 1, characterized in that: The adjusting mechanism comprises an adjusting rod, a first moving member, a second moving member, a first connecting member, a second connecting member and a mounting plate; The adjusting rod is passed through the rotating shaft, the first moving member and the second moving member are spaced apart along the axial direction of the rotating shaft and installed on the adjusting rod, and the adjusting rod can make the first moving member and the second moving member move toward or away from each other along the axial direction of the rotating shaft; The rotating shaft is formed with a long guide hole extending along the axial direction of the rotating shaft, and part of the first moving member and part of the second moving member can be movably arranged in the long guide hole; The first end of the first connecting member and the first end of the second connecting member are both hinged to the mounting plate, and the second end of the first connecting member and the second end of the second connecting member are hinged to the first moving member and the second moving member respectively; The permanent magnet rotor is mounted on a side of the mounting plate away from the rotating shaft.

3. The rotor assembly according to claim 2, characterized in that: The adjusting rod is capable of rotating relative to the rotating shaft, and a first thread and a second thread are formed on the adjusting rod. The thread rotation direction of the first thread is opposite to the thread rotation direction of the second thread. The first moving member is connected to the first thread and forms a screw nut pair, and the second moving member is connected to the second thread and forms a screw nut pair.

4. The rotor assembly according to claim 3, characterized in that: The first end of the rotating shaft is used to extend outside the motor housing, the first end of the adjusting rod extends from the first end of the rotating shaft and forms an annular operating part, an indicating block is arranged on the outer circumference of the annular operating part, and a scale is arranged on the outer circumference of the first end of the rotating shaft.

5. The rotor assembly according to any one of claims 2 to 4, characterized in that: There are multiple permanent magnet rotors, and the multiple permanent magnet rotors are arranged at intervals along the circumference of the rotating shaft. There are multiple first connecting members and multiple second connecting members. The multiple first connecting members, multiple second connecting members and multiple permanent magnet rotors are arranged in a one-to-one correspondence. The multiple first connecting members are hinged to the same first moving member, and the multiple second connecting members are hinged to the same second moving member.

6. The rotor assembly according to any one of claims 1 to 4, characterized in that: The rotor assembly further includes a guide plate and a coil, an air inlet slot is formed on a side of the permanent magnet rotor away from the rotating shaft, the guide plate is mounted on the permanent magnet rotor and located at the notch of the air inlet slot, and the guide plate is used to guide airflow into the air inlet slot when the permanent magnet rotor rotates; A ventilation hole is formed on the permanent magnet rotor, and the ventilation hole is communicated with the air inlet slot; The coil is wound around the permanent magnet rotor, and the coil bypasses an outer wall of the permanent magnet rotor on which the ventilation hole is formed.

7. The rotor assembly according to claim 6, characterized in that The ventilation holes are formed on opposite sides of the permanent magnet rotor; The rotor assembly also includes a diverter block arranged in the air inlet slot, the cross-section of the diverter block is constructed as an isosceles triangle, the tip of the isosceles triangle faces the notch of the air inlet slot, and the two waists of the isosceles triangle face the ventilation holes on both sides of the permanent magnet rotor respectively.

8. A permanent magnet synchronous motor, characterized in that: It comprises a motor casing, a motor stator and a rotor assembly according to any one of claims 1-7.

9. The permanent magnet synchronous motor according to claim 8, characterized in that: The permanent magnet synchronous motor also includes a dustproof net arranged in the motor housing, the dustproof net divides the interior of the motor housing into a first chamber and a second chamber, an air inlet and an ash discharge port are formed on the motor housing, the air inlet and the ash discharge port are both connected to the first chamber, the ash discharge port is located at the bottom of the first chamber, and the permanent magnet rotor, the adjustment mechanism and the motor stator are all arranged in the second chamber; The permanent magnet synchronous motor further includes a cleaning brush disposed in the first chamber, wherein the cleaning brush is connected to the rotating shaft and can contact the surface of the dustproof net.

10. The permanent magnet synchronous motor according to claim 9, characterized in that: The permanent magnet synchronous motor further includes a bracket, a guide rod and a spring arranged in the first chamber; The bracket is connected to the rotating shaft, a guide hole is formed on the bracket, one end of the guide rod is connected to the cleaning brush, the other end of the guide rod is movably inserted into the guide hole, the spring is sleeved on the guide rod, one end of the spring is connected to the cleaning brush, and the other end of the spring is connected to the bracket.

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