Rotor assembly of permanent magnet synchronous motor and permanent magnet synchronous motor

Abstract

The invention discloses a rotor assembly of a permanent magnet synchronous motor and the permanent magnet synchronous motor, and relates to the technical field of motors, the rotor assembly comprises a rotor iron core and a rotating shaft coaxially fixed with the rotor iron core, the end part of the rotor iron core is fixedly provided with a circular baffle plate, and the rotating shaft is movably sleeved with a ring sleeve plate parallel to the circular baffle plate. A threaded rod movably penetrates through the outer side wall of the ring sleeve plate, the threaded rod can axially move to be in limiting clamping connection with the rotating shaft, and a dynamic balance weight unit in transmission connection with the threaded rod is movably installed on the ring sleeve plate; the threaded rod capable of being connected with the rotating shaft in a limiting and clamping mode is spirally arranged on the outer side wall of the ring sleeve plate, whether the ring sleeve plate can be turned over or not is controlled by rotating the threaded rod forwards or reversely, and therefore the rotating speed of the ring sleeve plate is controlled. And the dynamic balance adjustment blind area of the motor rotor can be eliminated.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a rotor assembly of a permanent magnet synchronous motor and the permanent magnet synchronous motor itself. Background Technology

[0002] A permanent magnet synchronous motor is a type of motor that generates a synchronous rotating magnetic field through excitation of permanent magnets. When the rotor of the motor rotates, the dynamic balance of the rotor has a significant impact on the motor's operating stability, noise level, and service life. Therefore, the adjustment of the dynamic balance of the motor rotor is particularly important. An existing example is Chinese Patent No. CN112688449B, entitled "A motor rotor and its dynamic balancing adjustment method, motor". This patent describes a motor rotor as follows: "The motor rotor includes: a shaft, the shaft including a shaft body; a rotor core, the rotor core sleeved on the shaft body; a dynamic balancing adjustment assembly, the dynamic balancing adjustment assembly including: an annular baffle, the annular baffle sleeved on the shaft body and located at at least one end of the rotor core, wherein: the annular baffle is provided with multiple balancing test slots, the multiple balancing test slots are all opened along the radial direction of the annular baffle, and the balancing test slots are evenly distributed in the circumferential direction of the annular baffle; each balancing test slot is provided with a corresponding balancing mass block, the balancing mass block can slide along the balancing test slot to perform dynamic balancing adjustment of the motor rotor, and this motor rotor solves the problem of the difficulty of dynamic balancing adjustment." The above-mentioned technical solution achieves dynamic balancing of the motor rotor by changing the position of the balancing mass block in the balancing test slot. However, the existing solution has shortcomings. Although multiple balancing test slots are evenly distributed on the annular baffle, the position of the balancing test slots on the annular baffle is fixed, and there is a gap between each balancing test slot. In practical applications, it is difficult to ensure that the unbalanced mass will fall into the area inside the balancing test slot. When the unbalanced mass falls into the area outside the balancing test slot, the existing solution is difficult to adjust, resulting in a blind spot in dynamic balancing. Therefore, we propose a new technical solution to solve the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a rotor assembly for a permanent magnet synchronous motor and a permanent magnet synchronous motor, so as to overcome the shortcomings of the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A rotor assembly for a permanent magnet synchronous motor includes a rotor core and a rotating shaft coaxially fixed to the rotor core. A circular baffle is fixed to the end of the rotor core. An annular plate parallel to the circular baffle is movably sleeved on the rotating shaft. A threaded rod is movably inserted through the outer wall of the annular plate. The threaded rod can move axially and engage with the rotating shaft at a limiting position. A dynamic balance counterweight unit that is movably mounted on the annular plate and driven by the threaded rod is provided. When the switching assembly is in the right-biased position, the drive of the threaded rod can control the cancellation and restoration of the fixed limiting state of the annular plate.

[0005] Preferably, the ring sleeve plate includes a circular plate body, and a central opening adapted to be connected to the rotating shaft is provided at the center of the circular plate body.

[0006] Preferably, the dynamic balancing counterweight unit includes an elongated groove opened along the radial direction of the ring plate, and a slider capable of engaging and transmitting power with the threaded rod is slidably fitted in the elongated groove.

[0007] Preferably, the switching component includes a positioning groove formed on the side of the slider, a guide rod is movably adapted in the positioning groove, the two ends of the guide rod are rotatably connected to the groove walls of their respective evenly distributed elongated grooves, the groove wall of the positioning groove is provided with a plurality of linearly distributed toothed grooves, and a plurality of linearly distributed protrusions are fixed on one side of the guide rod. When the guide rod is deflected to the first position, the protrusions engage with the toothed grooves to restrict the linear movement of the slider, and at this time the switching component is in the right-biased position.

[0008] Preferably, the positioning groove is provided with a limiting ring that is sleeved and fixed to the threaded rod, and one end of the positioning groove is provided with a limiting fork that is fixed to the guide rail rod. When the guide rail rod is deflected to the second position, the fork of the limiting fork engages with the limiting ring to restrict the axial movement of the threaded rod. At this time, the switching component is in the left deflection position.

[0009] Preferably, a cover plate is fixed at the groove opening at the other end of the positioning groove. The cover plate has a vertically spirally threaded thread extending into the positioning groove. A first lever and a second lever are fixed in the circumferential direction of the guide rail rod. A protruding plate is provided between the first lever and the second lever, which is fixedly sleeved with the thread. Both the first lever and the second lever can be pushed by the protruding plate to drive the guide rail rod to deflect.

[0010] Preferably, the threaded rod is located directly above the threaded rod, and a toothed block that can mesh and engage with the threaded rod is rotatably mounted at the bottom end of the threaded rod. The toothed block pressing against the threaded rod restricts the axial rotation of the threaded rod.

[0011] Preferably, the bottom of the toothed block and the bottom of the slider are provided with arc-shaped grooves adapted to the threaded rod, and the groove walls of the arc-shaped grooves are provided with tooth grooves that mesh with the threads of the threaded rod. The edge surface of the toothed block and the groove wall surface of the long groove slide in vertical contact.

[0012] Preferably, the top of the slider has a receiving groove, and the bottom surface of the receiving groove has multiple threaded holes, in which counterweight screws are fitted and installed.

[0013] Preferably, a permanent magnet synchronous motor is provided, wherein the permanent magnet synchronous motor is provided with the rotor assembly described above.

[0014] In the above technical solution, the rotor assembly of a permanent magnet synchronous motor provided by the present invention features a rotatable ring plate on a circular baffle at the end of the rotor core, and a dynamic balancing counterweight unit is mounted on the ring plate. A threaded rod, capable of locking and engaging with the rotating shaft, is spirally threaded through the outer wall of the ring plate. In practice, the rotation of the ring plate is controlled by rotating the threaded rod forward or backward. For example, if the threaded rod is locked and engaged with the rotating shaft, the ring plate cannot rotate. Furthermore, when the switching component is switched to the left-biased position, the position of the dynamic balancing counterweight unit relative to the circular baffle is changed by rotating the threaded rod forward or backward. The overall structure is simple and stable, the operation is convenient, and the adjustment is flexible. It helps to eliminate the blind spot in the dynamic balance adjustment of the motor rotor and has good practical significance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the rotor core of a permanent magnet synchronous motor rotor assembly according to the present invention. Figure 2 This is a cross-sectional schematic diagram of the elongated slot of the rotor assembly of a permanent magnet synchronous motor according to the present invention on a circular plate. Figure 3 This is a schematic diagram of the structure of the switching component of the rotor assembly of a permanent magnet synchronous motor according to the present invention. Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the receiving groove of the rotor assembly of a permanent magnet synchronous motor according to the present invention on the slider.

[0017] Explanation of reference numerals in the attached figures: 1. Rotor core; 2. Shaft; 3. Circular baffle; 4. Ring plate; 4.1. Circular plate; 4.2. Center opening; 5. Threaded rod; 6. Dynamic balance counterweight unit; 6.1. Long groove; 6.2. Sliding block; 7. Switching assembly; 7.1. Positioning groove; 7.2. Guide rail rod; 7.3. Toothed groove; 7.4. Protrusion; 7.5. Limiting ring; 7.6. Limiting fork; 8. Threaded column; 9. First lever; 10. Second lever; 11. Protruding plate; 12. Toothed block; 13. Receiving groove; 14. Threaded hole; 15. Counterweight screw; 16. Cover plate. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Please see Figures 1-5 The present invention provides a rotor assembly for a permanent magnet synchronous motor, including a rotor core 1 and a rotating shaft 2 coaxially fixed with the rotor core 1. A circular baffle 3 is fixed at the end of the rotor core 1. An annular plate 4 parallel to the circular baffle 3 is movably sleeved on the rotating shaft 2. A threaded rod 5 is movably passed through the outer wall of the annular plate 4. The threaded rod 5 can move axially and engage with the rotating shaft 2. A dynamic balance counterweight unit 6 is movably mounted on the annular plate 4 and is connected to the threaded rod 5. A switching component 7 is provided between the dynamic balance counterweight unit 6 and the threaded rod 5. When the switching component 7 is in the left bias position, the balance counterweight unit 6 can be driven by the threaded rod 5 and move. When the switching component 7 is in the right bias position, the drive of the threaded rod 5 can control the cancellation and restoration of the fixed limit state of the annular plate 4. Specifically, the shaft 2 has corresponding anti-slip textures, such as toothed grooves, on its circumference. The ring plate 4 can fit against the surface of the circular baffle 3. The ring plate 4 includes a circular plate 4.1. The center of the circular plate 4.1 has a center opening 4.2 that is compatible with the shaft 2. The axis of the center opening 4.2 coincides with the axis of the shaft 2. The circular plate 4.1 can rotate circumferentially around the shaft 2. The axis of the threaded rod 5 is parallel to the surface of the ring plate 4. One end of the threaded rod 5 can engage with the anti-slip texture on the shaft 2. Preferably, the end of the threaded rod 5 is a tapered end, which facilitates engagement with the anti-slip texture. The other end of the threaded rod 5 extends out of the outer wall of the ring plate 4. The outer wall of the ring plate 4 is provided with a knob block that is fixed to the end of the threaded rod 5. Under normal circumstances, one end of the threaded rod 5 engages with the anti-slip texture on the rotating shaft 2. At this time, the ring plate 4 is in a fixed and limited state. When adjustment is required, first determine whether the unbalanced mass falls within the moving area of ​​the balance counterweight unit 6 based on the dynamic balance test results of the dynamic balance test machine. If the unbalanced mass is within the moving area of ​​the balance counterweight unit 6, the switching component 7 is in the left-biased position. At this time, the position of the balance counterweight unit 6 can be adjusted by directly rotating the threaded rod 5. If the unbalanced mass is not within the movement range of the counterweight unit 6, switch the switching component 7 to the right-biased position and then rotate the threaded rod 5 counterclockwise. This will cause the threaded rod 5 to move away from the rotating shaft 2. Once the end of the threaded rod 5 is completely separated from the anti-slip pattern of the rotating shaft 2, the ring plate 4 can rotate freely. After the rotation position of the ring plate 4 is adjusted, rotate it clockwise until the end of the threaded rod 5 is completely re-engaged with the anti-slip pattern of the rotating shaft 2. Then, the ring plate 4 will be in a fixed and limited state again. The dynamic balance test results of the dynamic balance tester will be used to determine whether the unbalanced mass falls within the movement range of the counterweight unit 6. Once it is determined that the unbalanced mass has finally fallen within the movement range of the counterweight unit 6, switch the switching component 7 back to the left-biased position. Then, depending on the actual situation, simply rotate the threaded rod 5 to adjust the position of the counterweight unit 6. Therefore, in practice, when the switching component 7 is in the right-biased position, the rotation of the threaded rod 5 can control whether the ring plate 4 can rotate. On the other hand, when the switching component 7 is switched to the left-biased position, the dynamic balance counterweight unit 6 can change its position relative to the circular baffle 3 by rotating the threaded rod 5. The overall structure is simple and stable, the operation is convenient, and the adjustment is flexible, which helps to eliminate the blind spot of dynamic balance adjustment of the motor rotor.

[0020] In another embodiment of the present invention, there are multiple dynamic balancing counterweight units 6, which are evenly distributed in a ring on the surface of the ring plate 4. Each dynamic balancing counterweight unit 6 includes an elongated groove 6.1 opened along the radial direction of the ring plate 4. A slider 6.2 that can engage with the threaded rod 5 is slidably fitted in the elongated groove 6.1. The slider 6.2 can reciprocate along the length direction of the elongated groove 6.1 under the drive of the threaded rod 5. The axis of the threaded rod 5 coincides with the center line of the groove body of the elongated groove 6.1. For example, if the threaded rod 5 rotates clockwise, the slider 6.2 moves toward the rotating shaft 2; if the threaded rod 5 rotates counterclockwise, the slider 6.2 moves away from the rotating shaft 2.

[0021] In another embodiment of the present invention, the switching component 7 includes a positioning groove 7.1 formed on the side of the slider 6.2. The length direction line of the positioning groove 7.1 is parallel to the length direction line of the elongated groove 6.1. A guide rod 7.2 is movably adapted in the positioning groove 7.1. The length direction line of the guide rod 7.2 is parallel to the length direction line of the elongated groove 6.1. The two ends of the guide rod 7.2 are rotatably connected to the groove walls of the elongated groove 6.1, and the guide rod 7.2 can rotate axially. A plurality of linearly distributed toothed grooves 7.3 are formed on the groove wall of the positioning groove 7.1. The length direction line of the toothed groove 7.3 is perpendicular to the length direction line of the positioning groove 7.1. A plurality of linearly distributed protrusions 7.4 are fixed on one side of the guide rod 7.2. The protrusions 7.4 can engage and limit the toothed grooves 7.3 on the slider 6.2 at any position. When the guide rod 7.2 is deflected to the first position, the protrusion 7.4 engages with the toothed groove 7.3, thus restricting the linear movement of the slider 6.2. At this time, the switching component 7 is in the right-biased position. That is to say, after the protrusion 7.4 engages with the toothed groove 7.3, the slider 6.2 is limited at the position of the long groove 6.1 and cannot move. Furthermore, a limiting ring 7.5 is provided in the positioning groove 7.1 to be sleeved and fixed to the threaded rod 5. A limiting fork 7.6 is provided in one end of the positioning groove 7.1 to be fixed to the guide rail rod 7.2. The limiting fork 7.6 includes a U-shaped part and a rod part. The opening of the U-shaped part forms the fork of the limiting fork 7.6. The rod part is perpendicularly fixed to the guide rail rod 7.2. When the guide rail rod 7.2 is deflected to the second position, the fork of the limiting fork 7.6 engages with the limiting ring 7.5 to restrict the axial movement of the threaded rod 5. At this time, the switching component 7 is in the left deflection position. In practical use, the position of the deflection of the guide rod 7.2 can determine the actual position of the switching component 7; When the guide rod 7.2 deflects to the first position, the switching component 7 is in the right-biased position. In the right-biased position, the protrusion 7.4 engages with the toothed groove 7.3, and the slider 6.2 is locked in the long groove 6.1 and cannot move. At the same time, the fork of the limiting fork 7.6 is also separated from the limiting ring 7.5, and the restriction on the axial movement of the threaded rod 5 is lifted. The threaded rod 5 engages with the slider 6.2 for transmission. That is to say, the slider 6.2 has a threaded part that can be adapted to the helix on the threaded rod 5. Therefore, when the threaded rod 5 rotates counterclockwise, it moves away from the rotating shaft 2, thereby releasing the fixed limiting state of the ring plate 4. When the threaded rod 5 rotates clockwise, it moves closer to the rotating shaft 2, thereby restoring the fixed limiting state of the ring plate 4. When the guide rod 7.2 deflects to the second position, the switching component 7 is in the left-biased position. In the left-biased position, the protrusion 7.4 separates from the toothed groove 7.3, and the slider 6.2 can move within the elongated groove 6.1. At the same time, the fork of the limiting fork 7.6 and the limiting ring 7.5 are also in a locked state, and the axial movement of the threaded rod 5 is restricted. Since the threaded rod 5 and the slider 6.2 are still in a meshing transmission state, when the threaded rod 5 rotates counterclockwise, the threaded part of the slider 6.2 causes the threaded rod 5 to move away from the rotating shaft 2 accordingly. When the threaded rod 5 rotates clockwise, the threaded part of the slider 6.2 causes the threaded rod 5 to move closer to the rotating shaft 2 accordingly.

[0022] In another embodiment of the present invention, a cover plate 16 is fixed at the opening of the other end of the positioning groove 7.1. A threaded rod 8 extends vertically and spirally through the cover plate 16 into the positioning groove 7.1. The axis of the threaded rod 8 is perpendicular to the surface of the annular plate 4. A first lever 9 and a second lever 10 are fixed circumferentially on the guide rail rod 7.2. The axis of the first lever 9 and the axis of the second lever 10 are both perpendicular to the axis of the guide rail rod 7.2. The centerlines of the first lever 9 and the second lever 10 are all on the same circumferential plane of the guide rail rod 7.2. The angle between the centerlines of the first lever 9 and the second lever 10 is an acute angle. A protruding plate 11 is provided between the first lever 9 and the second lever 10 and is fixedly sleeved with the screw rod 8. The protruding plate 11 is within the acute angle range between the centerlines of the first lever 9 and the second lever 10. Both the first lever 9 and the second lever 10 can be pushed by the protruding plate 11 to drive the guide rail rod 7.2 to deflect. Furthermore, the threaded rod 8 is located directly above the threaded rod 5. The top of the threaded rod 8 is provided with a cross groove, an internal hexagonal groove, and other groove structures to facilitate compatibility with knob tools. The bottom end of the threaded rod 8 is rotatably mounted with a toothed block 12 that can mesh and engage with the threaded rod 5. The toothed block 12 and the threaded rod 5 are pressed together to restrict the axial rotation of the threaded rod 5. It should be further explained that when the screw rod 8 rotates counterclockwise, the screw rod 8 moves upward as a whole, and when the screw rod 8 rotates clockwise, the screw rod 8 moves downward as a whole. In the vertical movement trajectory of the screw rod 8, there are three positions from bottom to top: the lowest position where the rotation of the threaded rod 5 is limited and locked, the middle position where the rotation of the threaded rod 5 is unlocked, and the highest position where the guide rod 7.2 is deflected to the first position. In actual use, the position of the screw 8 in the groove depth direction of the long groove 6.1 is changed by rotating the screw 8, thereby realizing the switching between the first position and the second position of the guide rod 7.2. Specifically, in the initial state, the screw 8 is in the lowest position and the guide rod 7.2 is in the second position. At this time, the screw 8 limits and locks the axial rotation of the threaded rod 5, which helps to prevent the threaded rod 5 from loosening on its own. At the same time, the screw 8 blocks the second lever 10 through the protruding plate 11, thereby limiting the axial rotation of the guide rod 7.2 and keeping the guide rod 7.2 in the second position. When it is necessary to adjust the slider 6.2, rotate the screw 8 counterclockwise until the screw 8 rises to the center position. The screw 8 no longer squeezes and limits the threaded rod 5. At this time, the restriction on the axial rotation of the threaded rod 5 is released. In this state, the guide rod 7.2 is still in the second position. The clockwise and counterclockwise rotation of the threaded rod 5 can drive the slider 6.2 to move in the long groove 6.1. When it is necessary for the circular plate 4.1 to rotate around the pivot 2, the screw 8 is rotated counterclockwise, thereby pushing the first lever 9 by the protruding disc 11 which is fixedly connected to the screw 8. The first lever 9 is fixed to the guide rail 7.2, thereby driving the guide rail 7.2 to deflect from the second position to the first position. When the guide rail 7.2 is in the first position, the clockwise and counterclockwise rotation of the threaded rod 5 can control the cancellation and restoration of the fixed limit state of the ring plate 4. Similarly, rotating the threaded rod 8 clockwise at its uppermost position causes it to move downwards. When the threaded rod 8 reaches the middle position, the guide rod 7.2 is still in the first position. As the threaded rod 8 continues to rotate clockwise at its middle position, the protruding disc 11, which is fixedly sleeved with the threaded rod 8, pushes the second lever 10. The second lever 10 is fixed to the guide rod 7.2, thereby causing the guide rod 7.2 to deflect from the first position to the second position. When the threaded rod 8 reaches the lowermost position, the guide rod 7.2 is also in the second position. The threaded rod 8 blocks the second lever 10 through the protruding disc 11, thus limiting the axial rotation of the guide rod 7.2 and keeping it in the second position. At the same time, the threaded rod 8 also compresses and limits the threaded rod 5. In other words, throughout the entire process, the guide rod 7.2 can be switched between the first and second positions simply by turning the moving thread rod 8 clockwise or counterclockwise. The dynamic balance can be adjusted by twisting the threaded rod 5. The structure is simple and conventional, and easy to operate.

[0023] In another embodiment of the present invention, both the bottom of the toothed block 12 and the bottom of the slider 6.2 are provided with arc-shaped grooves adapted to the threaded rod 5. The groove walls of the arc-shaped grooves are provided with toothed grooves that mesh with the threads of the threaded rod 5. The edge surface of the toothed block 12 slides in contact with the groove wall surface of the elongated groove 6.1 in the vertical direction, thereby keeping the length direction line of the arc-shaped groove parallel to the length direction line of the threaded rod 5, ensuring that the arc-shaped groove can mesh with the threaded rod 5, and thus maintaining a good limiting effect on the axial rotation of the threaded rod 5.

[0024] In another embodiment of the present invention, a receiving groove 13 is provided on the top of the slider 6.2, and a plurality of threaded holes 14 are provided on the bottom surface of the receiving groove 13. A counterweight screw 15 is installed in the threaded hole 14. Preferably, the actual number of threaded holes 14 is greater than the number of counterweight screws 15. The weights of the counterweight screws 15 in the receiving groove 13 are different, and the ratio between the weights of the counterweight screws 15 is 1:2:2:5. Therefore, in actual use, the counterweight screws 15 can be distributed to other receiving grooves 13 according to actual needs and installed in accordance with the threaded holes 14, thereby redistributing the weight of the slider 6.2. The weight ratio between the counterweight screws 15 is 1:2:2:5, which is conducive to more precise selection of the weight when distributing the counterweight screws 15. For example, for three units of counterweight, 1 and 2 can be selected; for seven units of counterweight, 2 and 5 can be selected; and for six units of counterweight, 1 and 5 can be selected. No matter what the required counterweight is, only a small number of counterweight screws 15 need to be adjusted.

[0025] In another embodiment of the present invention, a permanent magnet synchronous motor is provided, wherein the permanent magnet synchronous motor is provided with the above-mentioned rotor assembly. When it is necessary to perform dynamic balance correction on the rotor of the permanent magnet synchronous motor, the guide rod 7.2 can be switched between the first position and the second position simply by turning the moving thread rod 8 clockwise or counterclockwise. The dynamic balance can be adjusted by twisting the threaded rod 5.

[0026] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A rotor assembly for a permanent magnet synchronous motor, comprising a rotor core (1) and a rotating shaft (2) coaxially fixed to the rotor core (1), wherein a circular baffle (3) is fixed to the end of the rotor core (1), characterized in that, A ring plate (4) parallel to the circular baffle (3) is movably sleeved on the rotating shaft (2). A threaded rod (5) is movably passed through the outer wall of the ring plate (4). The threaded rod (5) can move axially and engage with the rotating shaft (2) in a limiting engagement. A dynamic balance counterweight unit (6) that is movably installed on the ring plate (4) and is connected to the threaded rod (5) in a transmission manner is provided between the dynamic balance counterweight unit (6) and the threaded rod (5). When the switching component (7) is in the right-biased position, the drive of the threaded rod (5) can control the cancellation and restoration of the fixed limiting state of the ring plate (4).

2. The rotor assembly of a permanent magnet synchronous motor according to claim 1, characterized in that, The ring plate (4) includes a circular plate body (4.1), and a central opening (4.2) adapted to be connected to the rotating shaft (2) is provided at the center of the circular plate body (4.1).

3. The rotor assembly of a permanent magnet synchronous motor according to claim 1, characterized in that, The dynamic balancing counterweight unit (6) includes an elongated groove (6.1) opened along the radial direction of the ring plate (4), and a slider (6.2) that can engage with the threaded rod (5) is slidably fitted in the elongated groove (6.1).

4. The rotor assembly of a permanent magnet synchronous motor according to claim 3, characterized in that, The switching component (7) includes a positioning groove (7.1) on the side of the slider (6.2). A guide rod (7.2) is movably fitted in the positioning groove (7.1). The two ends of the guide rod (7.2) are rotatably connected to the groove walls of the corresponding long grooves (6.1). Multiple linearly distributed toothed grooves (7.3) are provided on the groove wall of the positioning groove (7.1). Multiple linearly distributed protrusions (7.4) are fixed on one side of the guide rod (7.2). When the guide rod (7.2) is deflected to the first position, the protrusions (7.4) engage with the toothed grooves (7.3) to restrict the linear movement of the slider (6.2). At this time, the switching component (7) is in the right-biased position.

5. The rotor assembly of a permanent magnet synchronous motor according to claim 4, characterized in that, The positioning groove (7.1) is provided with a limiting ring (7.5) that is sleeved and fixed to the threaded rod (5). One end of the positioning groove (7.1) is provided with a limiting fork (7.6) that is fixed to the guide rail rod (7.2). When the guide rail rod (7.2) is deflected to the second position, the fork of the limiting fork (7.6) engages with the limiting ring (7.5) to restrict the axial movement of the threaded rod (5). At this time, the switching component (7) is in the left deflection position.

6. The rotor assembly of a permanent magnet synchronous motor according to claim 5, characterized in that, A cover plate (16) is fixed at the opening of the other end of the positioning groove (7.1). The cover plate (16) has a vertical spiral thread (8) that extends into the positioning groove (7.1). A first lever (9) and a second lever (10) are fixed in the circumferential direction of the guide rail (7.2). A protruding plate (11) is provided between the first lever (9) and the second lever (10) and is fixedly sleeved with the thread (8). The first lever (9) and the second lever (10) can both be pushed by the protruding plate (11) to drive the guide rail (7.2) to deflect.

7. The rotor assembly of a permanent magnet synchronous motor according to claim 6, characterized in that, The threaded rod (8) is located directly above the threaded rod (5). The bottom end of the threaded rod (8) is rotatably mounted with a toothed block (12) that can mesh and engage with the threaded rod (5). The toothed block (12) and the threaded rod (5) are pressed together to restrict the axial rotation of the threaded rod (5).

8. The rotor assembly of a permanent magnet synchronous motor according to claim 7, characterized in that, The bottom of the toothed block (12) and the bottom of the slider (6.2) are both provided with arc-shaped grooves adapted to the threaded rod (5). The groove walls of the arc-shaped grooves are provided with tooth grooves that mesh with the threads of the threaded rod (5). The edge surface of the toothed block (12) and the groove wall surface of the long groove (6.1) slide in vertical contact.

9. The rotor assembly of a permanent magnet synchronous motor according to claim 3, characterized in that, The top of the slider (6.2) has a receiving groove (13), and the bottom surface of the receiving groove (13) has multiple threaded holes (14), and a counterweight screw (15) is installed in the threaded hole (14).

10. A permanent magnet synchronous motor, characterized in that, The permanent magnet synchronous motor is provided with a rotor assembly as described in any one of claims 1-9.

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