Surface-mounted permanent magnet motor rotor and rotor segmented inclined pole magnet fixing structure
Patent Information
- Application Number
- CN202521772180.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2026-09-22
- Estimated Expiration
- 2035-08-20
AI Technical Summary
通过磁钢固定键与磁钢压板的组合结构对磁钢本体进行径向限位，配合分段的转子铁芯本体和转子端板实现轴向限位，无需依赖胶水固定，有效避免了胶黏固定法中因受热导致胶水老化失效、高频振动下开裂的问题，且不受离心力限制，适用于高速电机场景；
Smart Images
Figure CN224790417U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a surface-mounted permanent magnet motor rotor with a segmented skewed pole magnet fixing structure. Background Technology
[0002] Currently, permanent magnet motors possess high efficiency, high power density, and excellent speed regulation performance, making them widely used in new energy vehicles, industrial drive systems, home appliances, and renewable energy fields. They are energy-saving and compact. To reduce cogging torque pulsation, lower electromagnetic harmonics, and reduce noise, permanent magnet high-voltage motors currently employ segmented skewed rotors to improve low-speed performance. Permanent magnet motors primarily utilize the permanent magnetic field characteristics of magnets. Based on pole arrangement and magnetic circuit design, permanent magnet motor rotors can be categorized into the following mainstream types: 1. Embedded permanent magnet motors, where magnets are embedded inside the rotor; 2. Surface-mounted permanent magnet motors, where magnets are attached to the outside of the rotor. Surface-mounted permanent magnet motors require the magnets to be fixed to the outer surface of the rotor, and their main manufacturing processes include the following, each with certain drawbacks: The first method is adhesive bonding. The disadvantages of this method are: limited temperature or vibration resistance, heat will be generated on the rotor surface, the adhesive is prone to aging and failure after being heated, the adhesive is prone to cracking under high frequency vibration, and the centrifugal force limitation is only suitable for low and medium speed motors. The second method is adhesive bonding and sheath fixing. Adhesive is applied to the contact area between the magnet and the rotor surface, and a high-strength sheath is added to the outside of the magnet to resist centrifugal force. However, the disadvantages of this process are that the stainless steel sheath is conductive, and eddy current loss will be generated on the surface of the rotor at high speed, which will reduce the overall efficiency of the permanent magnet motor. The carbon fiber sheath has poor thermal conductivity, and this method is expensive, as carbon fiber and titanium alloy materials are expensive and the manufacturing process is complicated. The third method is the mechanical method, which involves drilling holes in the surface of the magnet and fixing it to the rotor surface with bolts. The disadvantage of this method is that it destroys the integrity of the magnet. Drilling holes in a single magnet will cause magnetic field loss, and the magnetic field lines will avoid the drilled position, resulting in a decrease in the overall magnetic energy product and affecting the performance of the permanent magnet motor. Therefore, it is necessary to design a surface-mounted permanent magnet motor rotor with a segmented skewed pole magnet fixing structure. Utility Model Content
[0003] The purpose of this invention is to provide a surface-mount permanent magnet motor rotor with a segmented, skewed pole magnet fixing structure to address the shortcomings of existing surface-mount permanent magnet motor processes that require the magnets to be fixed to the outer surface of the rotor: adhesive fixing methods have limited temperature and vibration resistance, the rotor surface generates heat, the adhesive is prone to aging and failure under heat, and the adhesive is prone to cracking under high-frequency vibration; centrifugal force limitations make it only suitable for low- and medium-speed motors. The proposed method combines adhesive fixing with a sheath fixing, applying adhesive at the contact point between the magnet and the rotor surface while simultaneously adding a high-strength sheath to the outside of the magnet. Resisting centrifugal force; however, this process has the disadvantage that the stainless steel sheath is conductive, and the high-speed rotating rotor surface will generate eddy current losses, reducing the overall efficiency of the permanent magnet motor. The carbon fiber sheath has poor thermal conductivity, and this method is expensive, as carbon fiber and titanium alloy materials are expensive and the manufacturing process is complex. The mechanical method involves drilling holes in the surface of the magnet and fixing it to the rotor surface with bolts. The disadvantage of this method is that it destroys the integrity of the magnet. Drilling holes in a single magnet will cause magnetic field loss, and the magnetic field lines will avoid the drilled location, resulting in a decrease in the overall magnetic energy product and affecting the performance of the permanent magnet motor.
[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a surface-mounted permanent magnet motor rotor with segmented skewed poles and a magnet fixing structure, including a rotor, the rotor including a rotating shaft, a rotor end plate, a magnet pressure plate, a magnet fixing key, a rotor core body, a magnet body and a rotor core key, the rotor core body being divided into multiple segments along the axial direction, each segment of the rotor core body being provided with a keyway, the keyway being marked with a serial number to correspond to the circumferential misalignment angle of different segments; The keyway of the rotating shaft is equipped with a rotor core key. The keyway of the rotor core body and the rotor core key are matched to form a circumferentially staggered arrangement. Each section of the rotor core body is fixedly installed on the rotating shaft in sequence. The precise matching of the key and the keyway ensures that the staggered angle of each section is consistent. Each section of the rotor core body is provided with multiple magnet fixing keys and magnet pressure plates arranged in a circular array with the rotor axis. The magnet fixing keys and magnet pressure plates are arranged alternately or correspondingly. The magnet fixing keys are installed in the magnet fixing groove of the rotor core body, and are adapted to the magnet fixing groove and installed firmly. The magnetic steel pressure plate is fixedly connected to the magnetic steel fixing key, and the gap between adjacent magnetic steel fixing keys and magnetic steel pressure plates forms a receiving cavity. The shape of the receiving cavity matches the outer peripheral contour of the magnetic steel body. The magnet body is inserted into the receiving cavity. The magnet fixing key and the magnet pressure plate play a radial limiting role on the magnet body in the receiving cavity to resist the centrifugal force on the magnet body when the motor is running. The segmented rotor core bodies play an axial limiting role on the magnet body. The axial constraint is formed by the end face of two adjacent rotor core bodies fitting together. Rotor end plates are fixedly installed at both ends of the rotor, and the rotor end plates are respectively attached to the end faces of the rotor core body located at both ends of the rotor axis. The rotor end plates play an axial limiting role for the magnet body to prevent the magnet body from moving along the axis.
[0005] As a further technical solution of this utility model, the rotor core body is formed by stacking and welding rotor laminations. After stacking and welding, an integral rigid structure is formed to ensure the overall structural strength and magnetic properties of the rotor core body.
[0006] As a further technical solution of this utility model, the magnet pressure plate is fixedly connected to the magnet fixing key by a countersunk hexagonal screw. The head of the countersunk hexagonal screw does not protrude from the surface of the magnet pressure plate to avoid interference with other components of the motor.
[0007] As a further technical solution of this utility model, the rotor core body and the shaft are fixed by an interference fit. The interference amount is designed according to the motor speed and load requirements to ensure that there is no relative rotation between the rotor core body and the shaft, thus ensuring the reliability of power transmission.
[0008] As a further technical solution of this utility model, the rotor end plate and the rotating shaft are fixedly connected by welding, forming a rigid connection after welding, which ensures that the rotor end plate is stable in position during motor operation and enhances the reliability of axial positioning.
[0009] As a further technical solution of this utility model, the rotor core key and the keyway of the shaft are connected by glue to enhance the connection between the rotor core key and the keyway of the shaft and prevent loosening.
[0010] As a further technical solution of this utility model, the receiving cavity formed between the adjacent magnet fixing key and the magnet pressure plate is adapted to the magnet body, and the adaptation gap is controlled within a preset range to ensure that the magnet body has no radial shaking in the receiving cavity and to ensure the installation accuracy of the magnet body.
[0011] The present invention provides a surface-mounted permanent magnet motor rotor with segmented skewed pole magnet fixing structure, the advantages of which are: The magnetic steel body is radially limited by the combination structure of the magnetic steel fixing key and the magnetic steel pressure plate, and axially limited by the segmented rotor core body and rotor end plate. It does not rely on glue for fixing, effectively avoiding the problems of glue aging and failure due to heat and cracking under high frequency vibration in the adhesive fixing method. It is also not limited by centrifugal force and is suitable for high-speed motor scenarios. There is no need to add stainless steel or carbon fiber sheaths to the outside of the magnet body. The magnet can be stably installed by the magnet fixing key, the magnet pressure plate and the rotor core body. This avoids the eddy current loss caused by the high-speed movement of the stainless steel sheath, solves the problem of poor thermal conductivity of the carbon fiber sheath, and reduces the cost caused by the use of expensive materials such as carbon fiber and titanium alloy, and simplifies the manufacturing process. The magnet body is fixed by the cavity formed by the fixing keys of adjacent magnets and the magnet pressure plate. There is no need to drill holes on the surface of the magnet body, which ensures the integrity of the magnet, avoids magnetic field loss and damage to magnetic lines of force, ensures that the magnetic energy product is not affected, and improves the overall performance of the permanent magnet motor. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a rotor diagram of the magnet fixing structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 for Figure 3 Enlarged view of the local structure of region A in the middle; Figure 5 This is a schematic diagram of the rotor core body structure of this utility model; Figure 6 This is a schematic diagram of the magnet body structure of this utility model; Figure 7 This is a schematic diagram of the magnet fixing key structure of this utility model; Figure 8 This is a schematic diagram of the magnetic steel pressure plate structure of this utility model.
[0014] In the diagram: 1. Shaft; 2. Rotor end plate; 3. Magnet pressure plate; 4. Socket head screw; 5. Magnet fixing key; 6. Rotor core body; 61. Rotor lamination; 7. Magnet body; 8. Rotor core key. Detailed Implementation
[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0016] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.
[0017] Please see the appendix Figure 1 - Appendix Figure 8 The present invention provides an embodiment of a surface-mount permanent magnet motor rotor with a segmented skewed pole magnet fixing structure, comprising a rotor, the rotor including a rotating shaft 1, a rotor end plate 2, a magnet pressure plate 3, a magnet fixing key 5, a rotor core body 6, a magnet body 7, and a rotor core key 8. The rotor core body 6 is divided into multiple segments along the axial direction, and each segment of the rotor core body 6 is provided with a keyway. The keyway is marked with a serial number to correspond to the circumferential misalignment angle of different segments. The rotor core body 6 is formed by stacking and welding rotor laminations 61, and after stacking and welding, an integral rigid structure is formed to ensure the overall structural strength and magnetic properties of the rotor core body 6. A rotor core key 8 is installed on the keyway of the rotating shaft 1. The rotor core key 8 and the keyway of the rotating shaft 1 are connected by glue to enhance the connection between the rotor core key 8 and the keyway of the rotating shaft 1 and prevent loosening. The keyway of the rotor core body 6 and the rotor core key 8 are matched to form a circumferentially staggered arrangement. Each section of the rotor core body 6 is fixedly installed on the rotating shaft 1 in sequence. The precise fit between the key and the keyway ensures that the staggered angle of each section is consistent. The rotor core body 6 and the rotating shaft 1 are fixed by interference fit. The interference is designed according to the motor speed and load requirements to ensure that there is no relative rotation between the rotor core body 6 and the rotating shaft 1 and to ensure the reliability of power transmission. Each section of the rotor core body 6 is provided with multiple magnet fixing keys 5 and magnet pressure plates 3 arranged in a circular array with the rotor axis. The magnet fixing keys 5 and magnet pressure plates 3 are arranged alternately or correspondingly. The magnet fixing keys 5 are installed in the magnet fixing groove of the rotor core body 6, and are compatible with the magnet fixing groove and are installed firmly. The magnet pressure plate 3 is fixedly connected to the magnet fixing key 5. The magnet pressure plate 3 is fixedly connected to the magnet fixing key 5 by the internal hexagon countersunk screw 4. The head of the internal hexagon countersunk screw 4 does not protrude from the surface of the magnet pressure plate 3 to avoid interference with other components of the motor. The gap between adjacent magnet fixing keys 5 and magnet pressure plates 3 forms a receiving cavity. The shape of the receiving cavity matches the outer periphery of the magnet body 7. The matching gap is controlled within a preset range to ensure that the magnet body 7 does not wobble radially in the receiving cavity and to ensure the installation accuracy of the magnet body 7. The magnet body 7 is inserted into the receiving cavity. The magnet fixing key 5 and the magnet pressure plate 3 play a radial limiting role on the magnet body 7 in the receiving cavity to resist the centrifugal force on the magnet body 7 when the motor is running. The segmented rotor core bodies 6 play an axial limiting role on the magnet body 7. The axial constraint is formed by the end face of two adjacent rotor core bodies 6 fitting together. Rotor end plates 2 are fixedly installed at both ends of the rotor, and the rotor end plates 2 are respectively attached to the end faces of the rotor core body 6 located at both ends of the rotor axis. The rotor end plates 2 play an axial limiting role for the magnet body 7, preventing the magnet body 7 from moving along the axis. The rotor end plates 2 are fixedly connected to the rotating shaft 1 by welding. After welding, a rigid connection is formed to ensure that the rotor end plates 2 are stable in position during motor operation and enhance the reliability of axial limiting.
[0018] Specifically, Figure 2 The surface-mount permanent magnet motor rotor with segmented skewed poles and a magnet fixing structure can be divided into: a shaft 1, a rotor end plate 2, a magnet pressure plate 3, countersunk head screws 4, a magnet fixing key 5, a rotor core body 6, a magnet body 7, and a rotor core key 8. Each segment of the rotor core body 6 has multiple magnet fixing keys 5 and magnet pressure plates 3, arranged in a circular array around the rotor axis. The magnet fixing keys 5 are installed in the magnet fixing slots of the rotor core body 6. The magnet pressure plates 3 are fixedly connected by countersunk head screws 4. The magnet fixing key 5 is integrally formed with the rotor, and the gap between adjacent magnet fixing keys 5 and magnet pressure plates 3 forms a receiving cavity; the magnet body 7 passes through the receiving cavity, and the magnet fixing key 5 and magnet pressure plates 3 can provide radial limiting for the magnet body 7 within the receiving cavity; at the same time, the segmented rotor core bodies 6 can provide axial limiting for the magnet body 7, and rotor end plates 2 are respectively set at both ends of the rotor, the rotor end plates 2 are fixedly connected to the rotor, and the rotor end plates 2 can provide axial limiting for the magnet body 7; the specific structure of the magnet pressure plate 3 is as follows. Figure 8 As shown, the specific structure of the magnet fixing key 5 is as follows: Figure 7 As shown, the specific structure of the rotor core body 6 is as follows: Figure 5 As shown, the specific structure of the magnet body 7 is as follows: Figure 6 As shown; Figure 5This is a diagram of the rotor core of a surface-mounted permanent magnet motor with a segmented skewed pole magnet fixing structure. The segmented rotor core body 6 is formed by stacking and welding rotor laminations 61. The keyways of the rotor laminations 61 are marked with serial numbers to facilitate the subsequent segmentation of the rotor core body 6 into skewed poles. The installation steps for the surface-mounted permanent magnet motor rotor with segmented skewed pole magnet fixing structure are as follows: First, install the rotor core key 8 on the keyway of the rotating shaft 1, and apply glue between the rotor core key 8 and the keyway of the rotating shaft 1 for fixing. The rotor core body 6 is segmented, stacked, and assembled. The rotor end plates 2 are then assembled according to... Figure 1 Install it onto the rotating shaft 1 as shown, and then follow the instructions. Figure 4 The enlarged view of the magnet fixing structure of the rotor of the surface-mounted permanent magnet motor with segmented skewed poles is shown. To assemble the first segment of the rotor with segmented skewed poles, the first segment of the rotor core body 6 is pressed onto the shaft 1. At this time, the keyway number 1 on the rotor lamination 61 matches the rotor core key 8 on the shaft 1. After pressing, the magnet fixing keys 5 are inserted into the magnet fixing slots of the first segment of the rotor core body 6. The magnet pressure plate 3 is fixedly connected to the magnet fixing key 5 with the rotor by the internal hexagon countersunk screw 4 to form an integral part. The gap between adjacent magnet fixing keys 5 and magnet pressure plates 3 forms a receiving cavity. The magnet body 7 passes through the receiving cavity, and the magnet fixing keys 5 and magnet pressure plates 3 can provide radial limiting for the magnet body 7 in the receiving cavity. At this point, the assembly of the first segment of the rotor with segmented skewed poles is completed. Then, the second and other sections are assembled in sequence. The assembly process is the same as that of the first section. The only difference is that when the rotor core body 6 of the second section is pressed onto the rotating shaft 1, the keyway number 2 on the rotor lamination 61 matches the rotor core key 8 on the rotating shaft 1. The other sections are assembled in the same way. Due to the skewed poles of the rotor segments, the rotor core body 6 plays an axial limiting role on the magnet body 7 between different sections. After the final assembly is completed, the rotor end plate 2 is installed on the rotating shaft 1, closely attached to the end plate of the last rotor core body 6, and then fixed on the rotating shaft 1 by welding, which serves to limit the axial movement of the magnet body 7.
[0019] In summary, this utility model uses the combination structure of the magnet fixing key 5 and the magnet pressure plate 3 to radially limit the magnet body 7, and the segmented rotor core body 6 and rotor end plate 2 to achieve axial limiting. It does not rely on glue for fixing, effectively avoiding the problems of glue aging and failure due to heat and cracking under high frequency vibration in the adhesive fixing method. It is also not limited by centrifugal force and is suitable for high-speed motor scenarios. There is no need to add a stainless steel or carbon fiber sheath to the outside of the magnet body 7. The magnet can be stably installed by the coordinated fixing of the magnet fixing key 5, the magnet pressure plate 3 and the rotor core body 6. This avoids the eddy current loss caused by the high-speed movement of the stainless steel sheath, solves the problem of poor thermal conductivity of the carbon fiber sheath, and reduces the cost caused by the use of expensive materials such as carbon fiber and titanium alloy, and simplifies the manufacturing process. The magnet body 7 is fixed by the cavity formed by the adjacent magnet fixing key 5 and the magnet pressure plate 3. There is no need to drill holes on the surface of the magnet body 7, which ensures the integrity of the magnet, avoids magnetic field loss and damage to magnetic lines of force, ensures that the magnetic energy product is not affected, and improves the overall performance of the permanent magnet motor.
[0020] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.
[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A surface-mounted permanent magnet motor rotor with segmented skewed poles and a magnet fixing structure, comprising a rotor, characterized in that: The rotor includes a rotating shaft (1), a rotor end plate (2), a magnet pressure plate (3), a magnet fixing key (5), a rotor core body (6), a magnet body (7), and a rotor core key (8). The rotor core body (6) is divided into multiple sections along the axial direction, and each section of the rotor core body (6) is provided with a keyway. The rotor core key (8) is installed on the keyway of the rotating shaft (1), and the keyway of the rotor core body (6) and the rotor core key (8) are matched to form a circumferentially staggered arrangement. Each section of the rotor core body (6) is provided with a plurality of magnet fixing keys (5) and magnet pressure plates (3) arranged in a circular array with the rotor axis. The magnet fixing keys (5) are installed in the magnet fixing groove of the rotor core body (6). The magnetic steel pressure plate (3) is fixedly connected to the magnetic steel fixing key (5), and the gap between adjacent magnetic steel fixing keys (5) and magnetic steel pressure plates (3) forms a receiving cavity; The magnet body (7) is inserted into the cavity, and the magnet fixing key (5) and the magnet pressure plate (3) play a radial limiting role on the magnet body (7) in the cavity; the segmented rotor core bodies (6) play an axial limiting role on the magnet body (7); Rotor end plates (2) are fixedly installed at both ends of the rotor, and the rotor end plates (2) play an axial limiting role on the magnet body (7).
2. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The rotor core body (6) is formed by stacking and welding rotor laminations (61).
3. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The magnet plate (3) is fixedly connected to the magnet fixing key (5) by a countersunk hexagonal screw (4).
4. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The rotor core body (6) and the shaft (1) are fixed by an interference fit.
5. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The rotor end plate (2) is fixedly connected to the rotating shaft (1) by welding.
6. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The rotor core key (8) and the keyway of the shaft (1) are connected by glue.
7. The surface-mounted permanent magnet motor rotor with segmented skewed poles and magnet fixing structure according to claim 1, characterized in that: The cavity formed between the adjacent magnet fixing key (5) and magnet pressure plate (3) is adapted to the magnet body (7).