Rotor structure and electric machine

Abstract

The utility model belongs to motor technical field discloses rotor structure and motor, when assembling rotor structure, the compression link is penetrated second iron core, and the compression link is connected with at least one balance ring axial plug, installs the force applying member in the balance ring, and makes the one end of force applying member to press in the compression link, makes force applying member to exert the action of compression link, force applying member promotes the compression link to move to the side of the first iron core center axis close, makes the compression link along the direction of the first iron core center axis close pressure joint in corresponding second iron core, to install second iron core in the compression link. The assembly mode of this rotor structure is simple, and the assembly efficiency is high, and moreover utilizes the cooperation of compression link and force applying member, and the compression link is pressure joint in corresponding second iron core along the direction of the first iron core center axis close, realizes the fixation of second iron core, to realize the non - magnetic - piece design of rotor structure, can improve the utilization of magnetic steel, reduce the cost of rotor structure, improve the stability and reliability of rotor structure.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a rotor structure and a motor. Background Technology

[0002] The rotor structure of a permanent magnet synchronous motor features a magnetic bridge, which exhibits significant magnetic leakage. As the maximum motor speed increases, the centrifugal force at that speed also increases. Considering structural strength requirements, the rotor design dictates that a thicker magnetic bridge is necessary to accommodate higher maximum speeds. However, using a thicker magnetic bridge undoubtedly exacerbates magnetic leakage, leading to lower magnet utilization and increased motor cost. Furthermore, the magnetic bridge increases the inductance of the D-axis and reduces the inductance difference between the D and Q axes, thus decreasing the motor's reluctance torque and requiring more magnets, further increasing motor cost.

[0003] To address this, related technologies propose eliminating the magnetic bridge design to improve magnet utilization. Currently, two common methods exist: First, the inner and outer cores of the magnet are connected using a locating key. However, this method places high demands on the machining of the locating key and the keyways on both cores, leading to high production costs. Furthermore, to ensure connection stability and prevent wobbling, the locating key and keyway use an interference fit, requiring significant external force to drive the locating key into the keyway, thus extending assembly time and reducing efficiency. Second, the two cores are clamped between two balance rings using tie rod bolts. However, since the stack thickness of the two cores may differ, there is a risk that one core may not be fully compressed.

[0004] Therefore, there is an urgent need for a rotor structure and motor to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this utility model is to provide a rotor structure and motor that improves the utilization rate of magnets, simplifies the assembly of the rotor structure, improves assembly efficiency, reduces the cost of the rotor structure, and improves the stability and reliability of the rotor structure.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The rotor structure includes:

[0008] Two balancing rings, spaced axially apart;

[0009] The first iron core is disposed between the two balance rings and fixed to the balance rings;

[0010] Multiple second iron cores are arranged at intervals around the outer periphery of the first iron core along the circumferential direction of the first iron core;

[0011] A magnet is disposed between the second iron core and the second iron core;

[0012] A pressure bar is provided and axially inserted into the second iron core, each pressure bar being axially inserted into at least one of the balance rings, and the pressure bar being able to move radially relative to the balance ring and the corresponding second iron core;

[0013] Each of the balance rings is equipped with a force-applying component corresponding to the pressure bar. The force-applying component is connected to the balance ring located at the same end of the second iron core along its axial direction, and one end of the force-applying component abuts against the corresponding pressure bar, so that the pressure bar presses against the corresponding second iron core in a direction close to the central axis of the first iron core.

[0014] As one possible implementation of the above rotor structure, the pressure rod passes through the corresponding second iron core along its own axial direction, and the two ends of the pressure rod are inserted into the two balance rings one by one.

[0015] As one possible implementation of the above rotor structure, the pressure bar includes a first pressing part, and the balance ring is provided with a first guide hole that is axially inserted into the first pressing part. The first pressing part can move radially relative to the balance ring within the first guide hole.

[0016] The pressure bar includes a second pressing part, and each of the two axial ends of the second pressing part is connected to a first pressing part. The second iron core corresponding to the pressure bar where the second pressing part is located is provided with a second guide hole. The second guide hole is axially inserted into the second pressing part. The second pressing part can move relative to the balance ring in the second guide hole along its own radial direction.

[0017] Along the radial direction of the first iron core, when the surface of the second pressing part near the center of the first iron core abuts against the inner wall of the second guide hole, the first pressing part and the first guide hole are in clearance fit.

[0018] As one possible implementation of the above rotor structure, the cross-section of the first pressing part perpendicular to its own axis and the cross-section of the first guide hole perpendicular to its own axis are both rectangular, and the moving direction of the first pressing part in the first guide hole is parallel to one side of the rectangle.

[0019] And / or, the cross-section of the second pressing part perpendicular to its own axis and the cross-section of the second guide hole perpendicular to its own axis are both trapezoidal. Along the radial direction of the first iron core, the short base of the trapezoid is closer to the central axis of the first iron core than the long base of the trapezoid. The movement direction of the second pressing part in the second guide hole is perpendicular to the short base of the trapezoid.

[0020] As one possible implementation of the above rotor structure, a stepped limiting surface facing the balance ring is formed at the junction of the first pressing part and the second pressing part, and the stepped limiting surface abuts against the balance ring.

[0021] As one possible implementation of the above rotor structure, the force-applying member extends radially along the balance ring and is threadedly connected to the balance ring.

[0022] As one possible implementation of the above rotor structure, the force-applying member does not protrude from the outer peripheral wall of the balance ring.

[0023] As one possible implementation of the above rotor structure, it also includes:

[0024] A pull rod is inserted through the first iron core, and both ends of the pull rod are threaded through the two balance rings and connected to a locking nut.

[0025] As one possible implementation of the above rotor structure, the outer peripheral wall of the balance ring is provided with at least two assembly positioning grooves arranged circumferentially therebetween, and the assembly positioning grooves are arranged through the balance ring along the axial direction.

[0026] And / or, the balance ring is provided with a clearance through hole that runs through its own thickness direction, and the second iron core is provided with a positioning through hole that runs through its own thickness direction and is coaxially arranged in correspondence with the clearance through hole, wherein the diameter of the clearance through hole is larger than the diameter of the positioning through hole.

[0027] To achieve the above objectives, the present invention also provides an electric motor, including the rotor structure provided in any of the above-described embodiments.

[0028] The beneficial effects of this utility model are:

[0029] This utility model provides a rotor structure. When assembling the rotor structure, a pressure rod is passed through the second iron core and axially inserted into at least one balance ring. A force-applying member is installed on the balance ring, and one end of the force-applying member is pressed against the pressure rod, so that the force-applying member applies force to the pressure rod. The force-applying member pushes the pressure rod to move towards the side closer to the central axis of the first iron core, so that the pressure rod is pressed against the corresponding second iron core in the direction close to the central axis of the first iron core, thereby installing the second iron core on the pressure rod.

[0030] The rotor structure has a simple assembly method and high assembly efficiency. Moreover, by using the cooperation of the pressure bar and the force-applying component, the pressure bar is pressed against the corresponding second iron core along the direction close to the central axis of the first iron core to fix the second iron core. This achieves the design of the rotor structure without magnetic shielding components, which can improve the utilization rate of magnets, reduce the cost of the rotor structure, and improve the stability and reliability of the rotor structure.

[0031] This invention provides an electric motor. By adopting the rotor structure described above, the utilization rate of magnets can be improved, the cost of the motor can be reduced, and the reliability of the motor can be increased. Attached Figure Description

[0032] Figure 1 This is a top view of the rotor structure provided in this embodiment of the utility model;

[0033] Figure 2 yes Figure 1 A magnified view of a portion of point I in the middle;

[0034] Figure 3 yes Figure 1 Sectional view along axis AA;

[0035] Figure 4 yes Figure 3 A magnified view of a portion of point M in the middle;

[0036] Figure 5 This is a cross-sectional view of the rotor structure provided in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the fit between the second iron core and the pressure rod provided in this embodiment of the utility model;

[0038] Figure 7 yes Figure 6 A magnified view of a portion of point J;

[0039] Figure 8 This is a top view of the balance ring provided in an embodiment of the present invention;

[0040] Figure 9 yes Figure 8 Sectional view along the BB direction;

[0041] Figure 10 This is a schematic diagram of the structure of the pressure bar provided in this embodiment of the utility model;

[0042] Figure 11 yes Figure 10 A magnified view of a portion of point K;

[0043] Figure 12 This is a top view of the first iron core provided in this embodiment of the utility model;

[0044] Figure 13 This is a side view of the drive shaft provided in an embodiment of the present invention.

[0045] In the picture:

[0046] 1. Balance ring; 11. Shaft clearance hole; 12. First through hole; 13. First guide hole; 14. Locking hole; 15. Clearance through hole; 16. Assembly positioning groove;

[0047] 2. First iron core; 21. Shaft hole; 22. Second through hole; 23. Locating key; 24. Mounting slot; 241. Magnet slot;

[0048] 3. Second iron core; 31. Second guide hole; 311. Second pressing surface; 32. Positioning through hole;

[0049] 4. Magnets;

[0050] 5. Pressure bar; 51. First pressing part; 52. Second pressing part; 521. First pressing surface; 53. Step limiting surface;

[0051] 6. Force-applying components;

[0052] 7. Drive shaft; 71. Keyway;

[0053] 8. Pull rod; 9. Locking nut. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0055] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0056] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0057] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0058] Embodiments of this utility model provide a rotor structure and a motor including the rotor structure, which improves the utilization rate of magnets, simplifies the assembly of the rotor structure, improves assembly efficiency, reduces the cost of the rotor structure, and improves the stability and reliability of the rotor structure. The following description uses the rotor structure of a permanent magnet motor as an example to illustrate the specific structure of this rotor.

[0059] like Figures 1 to 11 As shown, the rotor structure includes two balance rings 1, a first iron core 2, a second iron core 3, a magnet 4, a pressure rod 5, and a force-applying component 6. The two balance rings 1 are axially spaced apart. The first iron core 2 is located between the two balance rings 1 and fixed to the balance rings 1. Multiple second iron cores 3 are provided. Multiple second iron cores 3 are arranged circumferentially around the outer periphery of the first iron core 2. The magnet 4 is located between the first iron core 2 and the second iron core 3. The pressure rod 5 is correspondingly arranged with the second iron core 3 and axially inserted. Each pressure rod 5 is axially inserted with at least one balance ring 1 and can move radially relative to the balance ring 1 and the corresponding second iron core 3.

[0060] Each balance ring 1 is equipped with a force-applying member 6 corresponding to the pressure bar 5. The force-applying member 6 is connected to the balance ring 1 located at the same end of the axis of the second iron core 3, and one end of the force-applying member 6 abuts against the corresponding pressure bar 5, so that the pressure bar 5 presses against the corresponding second iron core 3 in a direction close to the central axis of the first iron core 2.

[0061] When assembling the rotor structure described above, the pressure rod 5 passes through the second iron core 3 and is axially inserted into at least one balance ring 1. The force-applying member 6 is installed on the balance ring 1, and one end of the force-applying member 6 presses against the pressure rod 5, so that the force-applying member 6 applies force to the pressure rod 5. The force-applying member 6 pushes the pressure rod 5 to move towards the side closer to the central axis of the first iron core 2, so that the pressure rod 5 is pressed against the corresponding second iron core 3 in the direction close to the central axis of the first iron core 2, so that the second iron core 3 is installed on the pressure rod 5.

[0062] The rotor structure has a simple assembly method and high assembly efficiency. Moreover, by using the cooperation of the pressure rod 5 and the force application component 6, the pressure rod 5 is pressed against the corresponding second iron core 3 along the direction close to the central axis of the first iron core 2, thereby fixing the second iron core 3. This realizes the design of the rotor structure without magnetic shielding components, which can improve the utilization rate of the magnet 4, reduce the cost of the rotor structure, and improve the stability and reliability of the rotor structure.

[0063] This utility model embodiment provides a motor. By adopting the above-described rotor structure, the utilization rate of the magnet 4 can be improved, the cost of the motor can be reduced, and the reliability of the motor can be improved.

[0064] In some embodiments, such as Figure 3 As shown, the pressure rod 5 passes through the corresponding second iron core 3 along its own axial direction, and the two ends of the pressure rod 5 are inserted into the two balance rings 1 one by one.

[0065] Each pressure rod 5 is simultaneously inserted into two balance rings 1, and each pressure rod 5 is equipped with two force-applying parts 6 at both ends of its axial direction, which enables the pressure rod 5 to more stably fix the second iron core 3.

[0066] As an alternative, each second iron core 3 can be equipped with two coaxially arranged pressure rods 5. The two pressure rods 5 are located at the two axial ends of the second iron core 3 respectively. Each pressure rod 5 is pressed against the second iron core 3 under the action of a force-applying member 6. That is, the two axial ends of the second iron core 3 are fixed by a pressure rod 5.

[0067] In some embodiments, such as Figures 4 to 9 As shown, the force-applying component 6 extends radially along the balance ring 1 and is threadedly connected to the balance ring 1. Specifically, the balance ring 1 is provided with a locking hole 14 and a first guide hole 13 that extends axially along the balance ring 1. The locking hole 14 extends radially along the balance ring 1, with one end extending to the outer peripheral wall of the balance ring 1 and the other end extending to the inner peripheral wall of the first guide hole 13. The second iron core 3 is provided with a second guide hole 31 that is axially opposite to the first guide hole 13. The pressure rod 5 passes through the first guide hole 13, and both ends of the pressure rod 5 are correspondingly inserted into the second guide holes 31 of the two balance rings 1. The force-applying component 6 is threadedly connected to the locking hole 14. Tightening the force-applying component 6 causes it to push the pressure rod 5 to move towards the side closer to the central axis of the first iron core 2 until the pressure rod 5 presses against the second iron core 3.

[0068] In some embodiments, such as Figures 4 to 11As shown, the pressure rod 5 includes a first pressing part 51 that is axially inserted into the first guide hole 13. The first pressing part 51 can move radially within the first guide hole 13 relative to the balance ring 1. The pressure rod 5 includes a second pressing part 52. Each of the two axial ends of the second pressing part 52 is connected to a first pressing part 51. The second iron core 3 corresponding to the pressure rod 5 with the second pressing part 52 is provided with the aforementioned second guide hole 31. The second guide hole 31 is axially inserted into the second pressing part 52. The second pressing part 52 can move radially within the second guide hole 31 relative to the balance ring 1. When the surface of the second pressing part 52 near the center of the first iron core 2 abuts against the inner wall of the second guide hole 31 along the radial direction of the first iron core 2, the first pressing part 51 and the first guide hole 13 are in clearance fit.

[0069] With the above configuration, when the force-applying component 6 is turned to push the pressure rod 5 towards the side closer to the central axis of the first iron core 2, when the surface of the second pressing part 52 near the center of the second iron core 3 abuts against the inner wall of the second guide hole 31, there is a small gap between the surface of the first pressing part 51 near the central axis of the first iron core 2 and the inner wall of the first guide hole 13, so that the pressure rod 5 presses against the second iron core 3.

[0070] In some embodiments, such as Figures 4 to 11 As shown, the cross-section of the first pressing part 51 perpendicular to its own axis and the cross-section of the first guide hole 13 perpendicular to its own axis are both rectangular. The moving direction of the first pressing part 51 in the first guide hole 13 is parallel to one side of the rectangle. This arrangement makes it convenient for the force-applying member 6 to come into contact with the first pressing part 51 when they abut against each other, which is beneficial for the force-applying member 6 to push the first pressing part 51 to move closer to the central axis of the first iron core 2.

[0071] In some embodiments, such as Figures 4 to 11 As shown, the cross-section of the second pressing part 52 perpendicular to its own axis and the cross-section of the second guide hole 31 perpendicular to its own axis are both trapezoidal. Along the radial direction of the first iron core 2, the short base of the trapezoid is closer to the central axis of the first iron core 2 than the long base of the trapezoid. The movement direction of the second pressing part 52 in the second guide hole 31 is perpendicular to the short base of the trapezoid.

[0072] The second pressing part 52 has two first pressing surfaces 521 arranged opposite each other along the circumference of the first iron core 2. The cross-section of the two first pressing surfaces 521 perpendicular to the axial direction of the second pressing part 52 is the two waists of a trapezoid. The inner walls of the two holes of the second guide hole 31 arranged opposite each other along the circumference of the first iron core 2 each form a second pressing surface 311. When the rotor structure is assembled, the two first pressing surfaces 521 press against the two second pressing surfaces 311 in a one-to-one correspondence. When the motor using this rotor structure is working, the second iron core 3 will generate centrifugal force when the rotor structure rotates. Since the cross-section of the second pressing part 52 perpendicular to its own axial direction and the cross-section of the second guide hole 31 perpendicular to its own axial direction are both trapezoidal, and the two first pressing surfaces 521 press against the two second pressing surfaces 311 in a one-to-one correspondence, under the premise that the pressure rod 5 is firmly fixed under the action of the force-applying member 6, the centrifugal force will increase the force between the first pressing surface 521 and the second pressing surface 311 that it abuts against, which will further fix the second iron core 3.

[0073] In some embodiments, a stepped limiting surface 53 facing the balance ring 1 is formed at the junction of the first pressing part 51 and the second pressing part 52, and the stepped limiting surface 53 and the balance ring 1 abut against each other axially.

[0074] When assembling the rotor structure, the step limiting surface 53 and the balance ring 1 can be used to axially limit the pressure rod 5.

[0075] In some embodiments, such as Figure 4 As shown, the force-applying component 6 does not protrude from the outer peripheral wall of the balance ring 1. This arrangement avoids interference with other structures caused by the force-applying component 6 protruding from the outer peripheral wall of the balance ring 1. It should be noted that after installation, the end of the force-applying component 6 away from the pressure rod 5 can be located on the same circumferential surface as the outer peripheral wall of the balance ring 1, or the end of the force-applying component 6 away from the pressure rod 5 can be spaced apart from the outer peripheral wall of the balance ring 1.

[0076] In some embodiments, such as Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 12 As shown, the rotor structure also includes a tie rod 8, which passes through the first iron core 2. The two ends of the tie rod 8 pass through the two balance rings 1 one by one and are threaded with locking nuts 9.

[0077] Specifically, the balance ring 1 has a first through hole 12 extending along its own axis, and the first iron core 2 has a second through hole 22 extending along its own axis. The pull rod 8 passes through the second through hole 22, and the two ends of the pull rod 8 correspondingly pass through the first through holes 12 of the two balance rings 1. Each end of the pull rod 8 is connected to a locking nut 9. By tightening the locking nut 9, the first iron core 2 is clamped between the two balance rings 1, thereby fixing the first iron core 2 and the balance ring 1 relatively.

[0078] In some embodiments, such as Figure 5 As shown, there are multiple tie rods 8, which are arranged at equal intervals around the first iron core 2. This arrangement can improve the connection stability between the first iron core 2 and the balance ring 1, as well as the uniformity of force distribution.

[0079] For example, there are six second iron cores 3 and six tie rods 8. A tie rod 8 is arranged between two adjacent second iron cores 3. In other words, the tie rods 8 and the second iron cores 3 are arranged alternately around the first iron core 2.

[0080] It should be noted that the number of second iron cores 3 can be six, four, or eight, etc., which will not be listed here.

[0081] In some embodiments, such as Figure 5 and Figure 12 As shown, the outer peripheral wall of the first iron core 2 is provided with a plurality of mounting grooves 24 arranged at intervals along its circumference. Each of the two opposite inner sidewalls of the mounting grooves 24 distributed along the circumference of the first iron core 2 is provided with a magnet groove 241. A magnet 4 is arranged in each magnet groove 241. The magnet 4 is located between the second iron core 3 and the bottom wall of the magnet groove 241.

[0082] For example, the mounting groove 24 is generally a V-shaped groove. Along the direction from the bottom to the opening of the mounting groove 24, the magnet 4 is confined between the two opposing inner walls of the magnet groove 241. The magnet groove 241 is axially continuous along the first iron core 2, and the two magnets 4 arranged in the same mounting groove 24 are distributed in a V-shape. When installing the magnet 4, it is only necessary to insert the magnet 4 into the magnet groove 241 along the axial direction of the first iron core 2.

[0083] As an alternative, the mounting slot 24 can also be a straight slot, with a magnet slot 241 formed on the bottom wall of the mounting slot 24, and a magnet 4 placed inside the magnet slot 241. The cross-section of the magnet 4 perpendicular to the axial direction of the first iron core 2 is approximately straight. The mounting slot 24 can also be a U-shaped slot with a gradually widening opening. A magnet slot 241 is provided on the inner walls of two opposite slots distributed circumferentially along the first iron core 2, and on the bottom wall of the U-shaped slot. One magnet 4 is placed inside each magnet slot 241, and the three magnets 4 corresponding to the same mounting slot 24 are arranged in a U-shape. The mounting slot 24 can also be a W-shaped slot, with a magnet slot 241 formed on each of the four inner walls of the U-shaped slot, and one magnet 4 placed inside each magnet slot 241. The four magnets 4 corresponding to the same mounting slot 24 are arranged in a W-shape. The mounting slot 24 can also be an arc-shaped slot located on the outer circumferential wall of the first iron core 2 and extending circumferentially along the first iron core 2, with one magnet 4 directly arranged inside each mounting slot 24.

[0084] It should be noted that each second iron core 3 can be equipped with one pressure rod 5, or two or more parallel pressure rods 5. The specific number of pressure rods 5 is determined according to the shape of the mounting groove 24. For example, when the mounting groove 24 adopts a W-shaped groove, each second iron core 3 can be equipped with two pressure rods 5. Specifically, the W-shaped groove is divided into two connected V-shaped grooves, and each part of the second iron core 3 placed in the W-shaped groove is equipped with one pressure rod 5 in the inner part of the two V-shaped grooves. When the mounting groove 24 adopts a straight groove, a V-shaped groove, an arc groove, or a U-shaped groove, each second iron core 3 can be equipped with one pressure rod 5.

[0085] Accordingly, the shape of the second iron core 3 is determined according to the shape of the mounting groove 24, but it is necessary to ensure that the outer peripheral surface of the second iron core 3 and the outer peripheral surface of the first iron core 2 are located on the same arc surface.

[0086] In some embodiments, such as Figure 12 and Figure 13 As shown, the first iron core 2 is provided with a shaft hole 21 coaxial with its own central axis. A drive shaft 7 with both ends extending out of the first iron core 2 is provided in the shaft hole 21. One of the inner peripheral walls of the shaft hole 21 and the outer peripheral wall of the drive shaft 7 is provided with a keyway 71, and the other is provided with a positioning key 23. The keyway 71 and the positioning key 23 are inserted along the axial direction of the first iron core 2, which can not only guide the assembly between the drive shaft 7 and the first iron core 2, but also restrict the rotation of the first iron core 2 relative to the drive shaft 7, even if the two can rotate synchronously.

[0087] For example, the shaft hole 21 and the drive shaft 7 are interference-fitted, and the connection between the first iron core 2 and the drive shaft 7 is stable.

[0088] For example, the keyway 71 is disposed on the outer peripheral wall of the drive shaft 7, and the positioning key 23 is disposed on the inner peripheral wall of the shaft hole 21. As an alternative, the keyway 71 can also be disposed on the inner peripheral wall of the shaft hole 21, and the positioning key 23 can be disposed on the outer peripheral wall of the drive shaft 7.

[0089] In some embodiments, such as Figure 8 and Figure 9 As shown, both balance rings 1 are provided with shaft clearance holes 11 for the drive shaft 7 to pass through, so that the drive shaft 7 can be connected to other structures.

[0090] In some embodiments, such as Figure 8 As shown, the outer peripheral wall of the balance ring 1 is provided with at least two assembly positioning grooves 16 arranged at intervals along its circumference. The assembly positioning grooves 16 are arranged through the axial direction of the balance ring 1 so that the balance ring 1 can be positioned by the assembly positioning grooves 16 in conjunction with other structures on the assembly tooling when the balance ring 1 is installed.

[0091] For example, there are two assembly positioning slots 16, which are arranged at 180°. The orthographic projection of the assembly positioning slots 16 on the horizontal plane is a semi-circular arc.

[0092] As an alternative, the number of assembly positioning slots 16 is not limited to two; it can also be three, four, or more, which will not be listed here. The assembly positioning slots 16 can also adopt a minor arc, and the assembly positioning slots 16 can also be a circular hole or a hole of other shapes on the balance ring 1.

[0093] In some embodiments, such as Figure 8 and Figure 9 As shown, the balance ring 1 is provided with a clearance through hole 15 that runs through its own axis, and the second iron core 3 is provided with a positioning through hole 32 that runs through its own thickness direction. The second iron core 3 and the clearance through hole 15 are coaxially arranged in a one-to-one correspondence. The diameter of the clearance through hole 15 is larger than the maximum diameter of the positioning through hole 32.

[0094] The positioning through hole 32 is used to pass through the positioning rod. When installing the balance ring 1, the positioning rod is used to position the balance ring 1. Since the lower balance ring 1 is installed before the second iron core 3, specifically, when installing the second iron core 3, the balance ring 1 has already been positioned using the assembly positioning groove 16 in conjunction with other structures on the assembly fixture. To avoid interference between the balance ring 1 and the positioning rod, a clearance through hole 15 is provided on the balance ring 1, and the diameter of the clearance through hole 15 is larger than the maximum diameter of the positioning through hole 32, so that the positioning rod passes through the clearance through hole 15 and is inserted into the second iron core 3 to position the second iron core 3.

[0095] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A rotor structure, characterized in that, include: Two balancing rings (1) are axially spaced apart; The first iron core (2) is disposed between the two balance rings (1) and fixed to the balance rings (1); The second iron core (3) is arranged at intervals around the outer periphery of the first iron core (2) along the circumference of the first iron core (2); A magnet (4) is disposed between the first iron core (2) and the second iron core (3); A pressure bar (5) is provided corresponding to the second iron core (3) and axially inserted. Each pressure bar (5) is axially inserted with at least one balance ring (1). The pressure bar (5) is radially movable relative to the balance ring (1) and the corresponding second iron core (3). Force application component (6): Each balance ring (1) is equipped with a force application component (6) corresponding to the pressure rod (5). The force application component (6) is connected to the balance ring (1) located at the same end of the second iron core (3) along the axial direction and one end of the force application component (6) abuts against the corresponding pressure rod (5), so that the pressure rod (5) is pressed against the corresponding second iron core (3) in a direction close to the central axis of the first iron core (2).

2. The rotor structure according to claim 1, characterized in that, The pressure rod (5) passes through the corresponding second iron core (3) along its own axial direction, and the two ends of the pressure rod (5) are inserted into the two balance rings (1) one by one.

3. The rotor structure according to claim 2, characterized in that, The pressure bar (5) includes a first pressing part (51), and the balance ring (1) is provided with a first guide hole (13) that is axially inserted into the first pressing part (51). The first pressing part (51) can move radially within the first guide hole (13) relative to the balance ring (1). The pressure rod (5) includes a second pressing part (52), and each of the two axial ends of the second pressing part (52) is connected to a first pressing part (51). The second iron core (3) corresponding to the pressure rod (5) where the second pressing part (52) is located is provided with a second guide hole (31). The second guide hole (31) is axially inserted into the second pressing part (52). The second pressing part (52) can move radially within the second guide hole (31) relative to the balance ring (1). Along the radial direction of the first iron core (2), when the surface of the second pressing part (52) near the center of the first iron core (2) abuts against the inner wall of the second guide hole (31), the first pressing part (51) and the first guide hole (13) are in clearance fit.

4. The rotor structure according to claim 3, characterized in that, The first pressing part (51) and the first guide hole (13) are both rectangular in cross-section perpendicular to their own axis. The moving direction of the first pressing part (51) in the first guide hole (13) is parallel to one side of the rectangle. And / or, the cross section of the second pressing part (52) perpendicular to its own axis and the cross section of the second guide hole (31) perpendicular to its own axis are both trapezoidal. Along the radial direction of the first iron core (2), the short base of the trapezoid is closer to the central axis of the first iron core (2) than the long base of the trapezoid. The moving direction of the second pressing part (52) in the second guide hole (31) is perpendicular to the short base of the trapezoid.

5. The rotor structure according to claim 3, characterized in that, At the junction of the first pressing part (51) and the second pressing part (52), a stepped limiting surface (53) facing the balance ring (1) is formed, and the stepped limiting surface (53) abuts against the balance ring (1).

6. The rotor structure according to any one of claims 1 to 5, characterized in that, The force-applying member (6) extends radially along the balance ring (1) and is threadedly connected to the balance ring (1).

7. The rotor structure according to any one of claims 1 to 5, characterized in that, The force-applying component (6) does not protrude from the outer peripheral wall of the balance ring (1).

8. The rotor structure according to any one of claims 1 to 5, characterized in that, Also includes: A pull rod (8) is inserted through the first iron core (2). The two ends of the pull rod (8) are threaded through the two balance rings (1) and then connected to a locking nut (9).

9. The rotor structure according to any one of claims 1 to 5, characterized in that, The outer peripheral wall of the balance ring (1) is provided with at least two assembly positioning grooves (16) arranged circumferentially therebetween, and the assembly positioning grooves (16) are arranged through the balance ring (1) along the axial direction. And / or, the balance ring (1) is provided with a clearance through hole (15) that runs through its own thickness direction, and the second iron core (3) is provided with a positioning through hole (32) that runs through its own thickness direction and is coaxially arranged in correspondence with the clearance through hole (15). The diameter of the clearance through hole (15) is larger than the diameter of the positioning through hole (32).

10. An electric motor, characterized in that, Includes the rotor structure as described in any one of claims 1 to 9.

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