Motor rotor magnet fixing structure and fixing method

Abstract

The application relates to the technical field of motors, and discloses a motor rotor magnet fixing structure and fixing method, which belong to a magnetic circuit rotating part and comprise a rotor body, the rotor body comprises two rotor stack structures, each rotor stack structure comprises a plurality of inner lining sheets, a plurality of notches are circumferentially and equidistantly formed on the inner lining sheets, only one limiting part or one supporting part is formed in each notch, the limiting part is in contact with one side of a magnet body in a placing channel and is bent, the limiting part is matched with the corresponding supporting part, a stable triangular supporting structure is formed on the magnet body, through the application, the magnet body is fixed without using glue, the magnet body is constrained by deformation force, the triangular supporting structure is formed in cooperation, the stability of deformation elasticity is improved, the assembly resistance is small, the efficiency is high, the reverse anti-falling force is large, the glue cost and the gluing process are saved, and bidirectional constraint is formed through left-right back-to-back assembly, so that the stable operation of the motor is ensured.

Description

Technical Field

[0001] This invention relates to the field of magnetic circuit rotating components of electric motors, and particularly to a motor rotor magnet fixing structure and fixing method. Background Technology

[0002] The core structure of an electric motor includes a stationary stator (containing the stator core and windings, which are the magnetic field generating components) and a rotatable rotor (containing the rotor core, windings or permanent magnets, which are the power output components), supplemented by auxiliary components such as bearings to support the rotor, junction boxes to conduct current, and protective housings. Its working principle is based on the laws of electromagnetic induction and electromagnetic force. By passing alternating current or direct current through the stator windings, the stator generates an alternating or constant magnetic field. Under the action of the magnetic field force, the rotor cuts the magnetic field lines, thereby generating electromagnetic torque to drive the rotor to rotate, and finally converting electrical energy into mechanical energy output to drive the load.

[0003] The core function of the magnets (mostly permanent magnets) on the rotor is to establish a stable magnetic field with a specific polarity around the rotor. As a key component of the electromagnetic coupling of the motor, they interact with the stator magnetic field. Conventional built-in permanent magnet synchronous motors (IPMs) use a structure design in which permanent magnets are embedded in the rotor core in a pre-set slot. In order to prevent the permanent magnets from shifting or falling off due to centrifugal force, vibration and other loads during motor operation, thermosetting adhesives are commonly used to bond and fix the permanent magnets in the slots in the existing technology. However, this fixing method has certain drawbacks. First, the raw material procurement cost of thermosetting adhesives is high, and its related costs account for a significant portion of the overall manufacturing cost of the motor rotor, directly affecting the economics of motor production. Second, the adhesive fixing process is cumbersome, requiring multiple steps such as applying adhesive, positioning the permanent magnet, and curing the adhesive. This not only increases production time and reduces production efficiency but also places high demands on the operating environment and precision. Third, due to factors such as the rotor core slot structure, the precision of the adhesive application equipment, and differences in manual operation, it is difficult to accurately control the amount of thermosetting adhesive applied. Too much adhesive will lead to material waste and further increase costs, while too little adhesive will not guarantee reliable bonding between the permanent magnet and the rotor core, which may cause the permanent magnet to loosen, shift, or even be damaged during high-speed motor operation, thereby affecting the motor's operational stability and service life. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a motor rotor magnet fixing structure and fixing method, which can use deformation force to constrain the magnet body to achieve glue-free fixing of the magnet body.

[0005] The present invention provides a motor rotor magnet fixing structure, including a rotor body, wherein the rotor body includes two rotor stacking structures, and each rotor stacking structure includes a plurality of stacked inner liner sheets. The inner lining sheet has multiple notches evenly spaced around its circumference. Each notch has a placement opening on one side that is connected to the notch. Each notch contains only a limiting part or a top support part. The number of limiting parts and top support parts are equal, and they are distributed alternately around the inner lining piece in a circumferential manner. After the two rotor stacked structures are assembled, the placement ports on the same radial plane are stacked to form a placement channel for limiting the magnet body; The limiting part contacts and bends one side of the magnet body in the placement channel, and the limiting part cooperates with the corresponding top support part to form a stable triangular support structure for the magnet body.

[0006] According to some embodiments of the present invention, the height of the limiting part is greater than the height of the notch, the limiting part is provided with a receiving groove, and the receiving groove contacts and engages with the top end of the corresponding top support part.

[0007] According to some embodiments of the present invention, the height of the top support is less than the height of the notch.

[0008] According to some embodiments of the present invention, the inner liner is provided with a plurality of circular grooves and a plurality of annular protrusions at equal intervals along the circumference on both sides, and two adjacent inner liners are fitted and engaged with the circular grooves by means of the annular protrusions.

[0009] According to some embodiments of the present invention, each of the inner lining pieces is provided with a first mounting hole at its center, and multiple first mounting holes are stacked to form a mounting channel. A rotating shaft is provided in the mounting channel, and multiple second mounting holes are equally spaced around each first mounting hole. Multiple second mounting holes on the same central axis are stacked to form a positioning channel.

[0010] According to some embodiments of the present invention, each of the magnet bodies has a plurality of anti-slip grooves linearly arranged at equal intervals on one side near the limiting part, and the anti-slip grooves cooperate with the upper edge of the corresponding limiting part. The two sides of each anti-slip groove are respectively a planar structure and a curved structure, and are symmetrically distributed around the centerline of the magnet body.

[0011] A method for fixing a motor rotor magnet fixing structure, the specific steps of which are as follows: S1 Preliminary preparation: Check the integrity of the inner lining, shaft and magnet body, check the surface cleanliness of each component, and remove any foreign objects on the surface; Assembly of S2 stacked structure: Adjacent inner liner pieces are matched and engaged by the annular protrusion of one inner liner piece and the circular groove of the other inner liner piece. Axial pressure is applied to the two inner liner pieces to achieve a tight connection between them. The above docking and engaging operation is repeated to stack multiple inner liner pieces along the axial direction to form a rotor stacked structure. After the rotor stacked structure is formed, the limiting parts and top support parts are linearly alternately distributed in the same plane along the length direction of the magnet body. Two rotor stacked structures with the same structure are made in the above manner. S3 Assembly: Place the magnet body between two rotor stack structures, aligning the two ends of the magnet body with the placement channels of the two rotor stack structures, so that the two rotor stack structures are arranged back-to-back. Simultaneously, apply pressure from both ends to the middle along the axial direction of the magnet body until the circular groove of the rightmost inner liner in the left rotor stack structure engages with the annular protrusion of the leftmost inner liner in the right rotor stack structure. During this process, the limiting part of the first inner liner group on the left is pressed to the left by the magnet body and bends, cooperating with the corresponding top support on the left to form support. The limiting part of the first inner liner group on the right is pressed to the right by the magnet body and bends, cooperating with the corresponding top support on the right to form support. Then, install the shaft into the installation channel formed along the axial direction of the rotor stack structure, thus completing the assembly of the motor rotor.

[0012] In summary, the present invention has the following main beneficial effects: (1) The present invention achieves glue-free fixation of the magnet body by setting the inner lining sheet, abandoning the traditional thermosetting glue fixation scheme. In the traditional glue fixation method, the high-priced thermosetting glue accounts for a large proportion of the rotor cost, and the glue application and curing processes are cumbersome, the glue amount is difficult to control, and the glue amount is prone to insufficient glue leading to fixation failure or excessive glue leading to material waste. The glue-free design of this application saves the investment in glue purchase and related glue application equipment, reduces the rotor manufacturing cost from the source, avoids the limitation of glue curing time on production efficiency, and avoids motor operation failure caused by glue aging and falling off. It improves the long-term reliability and environmental adaptability of the rotor structure, and improves the technical advantages and economic value.

[0013] (2) By setting the inner lining, notch, limiting part, receiving groove, top support part, annular protrusion and circular groove, the present invention realizes the construction of multiple sets of linearly arranged triangular support structures by using the force deformation of the limiting part of the inner lining and the cooperation of the top support part, forming an efficient and stable mechanical constraint system. Because the triangular structure itself has excellent mechanical stability, it can uniformly transmit the radial force and centrifugal force on the magnet body to the rotor core. The deformation process of the limiting part not only provides a fitting margin for the magnet assembly, but also generates a constant clamping constraint force on the magnet due to the continuous deformation elastic force. This structural design minimizes the resistance when the magnet slides into the assembly direction, greatly reducing the difficulty of assembly operations and improving assembly efficiency. At the same time, the resistance to pushing out in the opposite direction increases geometrically, which can effectively resist the tendency of the magnet to shift due to centrifugal force and vibration when the motor is running at high speed, ensuring the positional stability of the magnet under all working conditions and avoiding problems such as motor torque fluctuations and efficiency reduction caused by magnet loosening.

[0014] (3) This invention employs a back-to-back assembly method to construct a bidirectional anti-detachment constraint mechanism. Specifically, the two rotor stacked structures are arranged back-to-back, and pressure is applied from both ends towards the middle along the axial direction of the magnet body. This assembly method achieves symmetrical clamping of the two rotor stacked structures from both ends of the magnet body. The limiting part of the left rotor stacked structure bends to the left to form a positive constraint, while the limiting part of the right rotor stacked structure bends to the right to form a reverse constraint. The two constraint structures are independent yet work together to form an omnidirectional wrapping fixation of the magnet body (as shown in the attached diagram). Figure 6 As shown in the figure, it forms a whole, which further enhances the reliability of fixing the magnet body, so that the magnet cannot be pushed out from any axial direction during the operation of the motor, providing a core structural guarantee for the long-term high-speed and stable operation of the motor. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the overall structure of the present invention; Figure 3 This is a schematic diagram showing the connection between the rotor stacking structure and the magnet body of the present invention; Figure 4 This is a schematic diagram of the front structure of the limiting part of the inner lining sheet of the present invention after being squeezed by the magnet body and bent. Figure 5 This is a schematic diagram of the back structure of the inner liner sheet of the present invention; Figure 6 This is a schematic cross-sectional view of the rotor stacking mechanism of the present invention; Figure 7 This is a schematic diagram of the magnet body structure of the present invention; Figure 8 This is a schematic diagram of the magnet body structure with anti-slip grooves according to the present invention; Figure 9 This is a plan view showing the cooperation between the anti-slip groove, the limiting part, and the top support part of the present invention.

[0016] In the diagram: 1. Rotor body; 11. Placement channel; 12. Installation channel; 13. Positioning channel; 2. Rotor stacking structure; 21. Inner liner; 211. First mounting hole; 212. Second mounting hole; 22. Notch; 23. Placement opening; 24. Limiting part; 241. Receiving groove; 25. Top support part; 26. Annular protrusion; 27. Circular groove; 3. Magnet body; 31. Anti-slip groove; 4. Rotating shaft. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, 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 limiting this invention.

[0019] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0021] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments: Example 1: A motor rotor magnet fixing structure, as shown in the attached figure. Figure 1-9As shown, the device includes a rotor body 1, which comprises two rotor stacking structures 2. Each rotor stacking structure 2 includes multiple stacked inner liner plates 21. Multiple notches 22 are evenly spaced around the inner liner plates 21. Each notch 22 has a placement opening 23 communicating with it on one side. Each notch 22 contains only one limiting part 24 or one top support part 25. The number of limiting parts 24 and top supports 25 is equal, and they are alternately distributed around the inner liner plates 21. After the two rotor stacking structures 2 are assembled, the placement openings 23 on the same radial plane are stacked to form a placement channel 11 for limiting the magnet body 3. The limiting part 24 contacts and bends one side of the magnet body 3 within the placement channel 11, and the limiting part 24 cooperates with the corresponding top support part 25 to form a stable triangular support structure for the magnet body 3 (as shown in the attached diagram). Figure 9 (As shown).

[0022] The above structure achieves glue-free fixation of the magnet body 3, uses deformation force to constrain the magnet body 3, and forms a triangular support structure to improve the stability of deformation elasticity. It has low assembly resistance, high efficiency, and strong reverse anti-detachment force to resist the tendency of magnet displacement. It saves glue costs and gluing process, avoids glue-related failure risks, reduces costs and improves reliability. Moreover, the back-to-back assembly on the left and right sides forms a bidirectional constraint to prevent the magnet from being pushed out from any direction, ensuring the long-term stable operation of the motor.

[0023] The specific operation is as follows: First, check the integrity of the inner lining sheet 21, the rotating shaft 4, and the magnet body 3, check the surface cleanliness of each component, and remove any foreign matter present on the surface; then, two adjacent inner lining sheets 21 are matched and engaged by the annular protrusion 26 of one inner lining sheet 21 and the circular groove 27 of the other inner lining sheet 21, and axial pressure is applied to the two inner lining sheets 21 to achieve the purpose of tightly connecting the two inner lining sheets 21 (after the two inner lining sheets 21 are engaged, there will be a certain deflection angle between them, and they will not be completely overlapped and stacked. During production, the deflection angle can be determined according to the number of placement openings 23, as shown in the attached figure). Figure 4The structure has six equally spaced, circularly distributed placement openings 23. When one of the inner lining pieces 21 is stacked, it needs to be deflected by 60 degrees so that the top support 25 and the corresponding limiting part 24 are in the same plane. Therefore, after the limiting part 24 is bent under force, the bent part will enter the notch 22 of the adjacent inner lining piece 21 so as to contact and cooperate with the corresponding top support 25. Repeat the above docking and engaging operation to stack multiple inner lining pieces 21 axially to form a rotor stacking structure 2. After the rotor stacking structure 2 is formed, the limiting parts 24 and the top support parts 25 are linearly alternating in the same plane along the length direction of the magnet body 3. Two rotor stacking structures 2 with the same structure are made in the above manner. Then, the magnet body 3 is placed between the two rotor stacking structures 2 so that the two ends of the magnet body 3 are respectively connected to the magnet body 21. The placement channels 11 of the two rotor stack structures 2 correspond, so that the two rotor stack structures 2 are arranged back to back. At the same time, pressure is applied from both ends to the middle along the axial direction of the magnet body 3 until the circular groove 27 of the rightmost inner liner 21 of the left rotor stack structure 2 and the annular protrusion 26 of the leftmost inner liner 21 of the right rotor stack structure 2 are engaged. During this process, the limiting part 24 of the first inner liner group on the left is pressed to the left by the magnet body 3 and forms a support with the corresponding top support part 25 on the left. The limiting part 24 of the first inner liner group on the right is pressed to the right by the magnet body 3 and forms a support with the corresponding top support part 25 on the right. Then, the rotating shaft 4 is installed in the installation channel 12 formed along the axial direction of the rotor stack structure 2, thus completing the assembly of the motor rotor.

[0024] Please refer to the appendix carefully. Figure 2-5As shown, the height of the limiting part 24 is greater than the height of the notch 22, so that the limiting part 24 protrudes from the notch 22 and contacts and bends with the magnet body 3 in the placement opening 23. The limiting part 24 is provided with a receiving groove 241, and the receiving groove 241 contacts and cooperates with the top of the corresponding top support part 25. Through the receiving groove 241, the stability of the connection between the top support part 25 and the limiting part 24 is improved. The height of the top support part 25 is less than the height of the notch 22, so as to provide space for the bent limiting part 24, so that after the limiting part 24 is bent, the bent part enters the corresponding notch 22 and then contacts and cooperates with the top support part 25 in the notch 22. The inner lining 21 has multiple circular grooves 27 and multiple... The annular protrusion 26 allows two adjacent inner lining pieces 21 to be fitted and engaged with the circular groove 27, thus providing radial deflection angle positioning during the stacking of the inner lining pieces 21. The deflection angle between each pair of adjacent inner lining pieces 21 is 60 degrees (which can be adjusted according to the number of magnets assembled). Each inner lining piece 21 has a first mounting hole 211 at its center. Multiple first mounting holes 211 are stacked to form a mounting channel 12. A rotating shaft 4 is provided in the mounting channel 12. Multiple second mounting holes 212 are equally spaced around each first mounting hole 211. Multiple second mounting holes 212 on the same central axis are stacked to form a positioning channel 13, which facilitates positioning and movement of the machine during assembly.

[0025] Example 2, please refer to the appendix for details. Figure 8 and attached Figure 9 As shown, each of the magnet bodies 3 has multiple anti-slip grooves 31 linearly arranged at equal intervals on one side near the limiting part 24, and the anti-slip grooves 31 cooperate with the upper edge of the corresponding limiting part 24. The two sides of each anti-slip groove 31 are respectively a planar structure and a curved structure, and are symmetrically distributed along the centerline of the magnet body 3. The curved structure facilitates the sliding and positioning of the limiting part 24 on each inner liner 21 during assembly. The planar structure can play a hindering role during the rotation of the rotor, preventing the inner liner 21 from falling off the axial direction of the rotating shaft 4.

[0026] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A motor rotor magnet fixing structure, comprising a rotor body (1), characterized in that, The rotor body (1) includes two rotor stacking structures (2), each of the rotor stacking structures (2) includes multiple stacked inner liner sheets (21). The inner lining (21) has multiple notches (22) evenly spaced around its circumference. Each notch (22) has a placement opening (23) connected to it on one side. Each notch (22) has only one limiting part (24) or one top support part (25). The number of the limiting part (24) and the top support part (25) are equal, and they are distributed alternately around the inner lining piece (21) in a circumferential direction; After the two rotor stacked structures (2) are assembled, the placement ports (23) on the same radial plane are stacked to form a placement channel (11) for limiting the magnet body (3). The limiting part (24) contacts and bends one side of the magnet body (3) in the placement channel (11), and the limiting part (24) cooperates with the corresponding top support part (25) to form a stable triangular support structure for the magnet body (3); The height of the limiting part (24) is greater than the height of the notch (22), and the limiting part (24) is provided with a receiving groove (241), and the receiving groove (241) is in contact with the top of the corresponding top support part (25); The height of the top support (25) is less than the height of the notch (22); The inner liner (21) has multiple circular grooves (27) and multiple annular protrusions (26) arranged at equal intervals around its two sides. Two adjacent inner liners (21) are fitted and engaged with the circular grooves (27) through the annular protrusions (26).

2. The motor rotor magnet fixing structure according to claim 1, characterized in that, Each of the inner lining pieces (21) has a first mounting hole (211) at its center. Multiple first mounting holes (211) are stacked to form a mounting channel (12). A rotating shaft (4) is provided in the mounting channel (12). Multiple second mounting holes (212) are arranged at equal intervals around each of the first mounting holes (211). Multiple second mounting holes (212) on the same central axis are stacked to form a positioning channel (13).

3. The motor rotor magnet fixing structure according to claim 1, characterized in that, Each of the magnet bodies (3) has multiple anti-slip grooves (31) linearly arranged at equal intervals on one side near the limiting part (24), and the anti-slip grooves (31) cooperate with the upper edge of the corresponding limiting part (24). The two sides of each anti-slip groove (31) are a planar structure and a curved structure, respectively, and are symmetrically distributed along the center line of the magnet body (3).

4. A method for fixing a motor rotor magnet fixing structure, characterized in that, The specific steps of using the motor rotor magnet fixing structure according to any one of claims 1-3 are as follows: S1 Preliminary preparation: Check the integrity of the inner lining (21), the rotating shaft (4) and the magnet body (3), check the surface cleanliness of each component, and remove any foreign matter on the surface; Assembly of S2 stacked structure: Two adjacent inner liner pieces (21) are matched and engaged through the annular protrusion (26) of one inner liner piece (21) and the circular groove (27) of the other inner liner piece (21). Axial pressure is applied to the two inner liner pieces (21) to achieve the purpose of tightly connecting the two inner liner pieces (21). The above docking and engaging operation is repeated to stack multiple inner liner pieces (21) along the axial direction to form a rotor stacked structure (2). After the rotor stacked structure (2) is formed, the limiting part (24) and the top support part (25) are linearly alternately distributed in the same plane along the length direction of the magnet body (3). Two rotor stacked structures (2) with the same structure are made in the above manner. S3 assembly: The magnet body (3) is placed between the two rotor stack structures (2), so that the two ends of the magnet body (3) correspond to the placement channels (11) of the two rotor stack structures (2) respectively, so that the two rotor stack structures (2) are arranged back to back. At the same time, pressure is applied from both ends to the middle along the axial direction of the magnet body (3) until the circular groove (27) of the rightmost inner liner (21) in the left rotor stack structure (2) and the leftmost inner liner (21) in the right rotor stack structure (2) are aligned. The annular protrusion (26) engages with the corresponding part. During this process, the limiting part (24) of the first inner liner group on the left is squeezed to the left by the magnet body (3) and bends, and cooperates with the corresponding top support part (25) on the left to form a support. The limiting part (24) of the first inner liner group on the right is squeezed to the right by the magnet body (3) and bends, and cooperates with the corresponding top support part (25) on the right to form a support. Then the rotating shaft (4) is installed in the mounting channel (12) formed along the axial direction of the rotor stacking structure (2), and the assembly of the motor rotor is completed.

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