Low-rare-earth embedded permanent magnet synchronous motor rotor structure

Abstract

The utility model relates to a low-rare-earth embedded permanent magnet synchronous motor rotor structure, and relates to the technical field of permanent magnet synchronous motors, the low-rare-earth embedded permanent magnet synchronous motor rotor structure comprises a rotor iron core, the inner side of the rotor iron core is provided with a plurality of groups of magnet cavities, each group of magnet cavities are arranged in a V shape, the number of each group of magnet cavities is two, and the number of each group of magnet cavities is two. The inner side of each magnet cavity is provided with neodymium iron boron, the inner side of the rotor core is provided with a plurality of groups of fixing square grooves, the number of each group of fixing square grooves is two, each group of fixing square grooves are symmetrically arranged up and down, and each group of fixing square grooves are respectively arranged between each group of two magnet cavities. The inner side of each fixing square groove is provided with a ferrite, and the outer side of each ferrite is provided with a protection frame. According to the invention, the ferrite is adopted to replace part of rare earth permanent magnet material neodymium iron boron in the rotor of the motor, so that the usage amount of the rare earth permanent magnet is reduced, the production cost of the motor is reduced, and the design cost of the rotor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet synchronous motors, and in particular to a rotor structure of a rare earth-reduced permanent magnet synchronous motor. Background Art

[0002] Rare earth permanent magnet synchronous motor is a device used to provide power. The starting torque and overload capacity of rare earth permanent magnet synchronous motor are one power level higher than those of three-phase asynchronous motor. Permanent magnet synchronous motor has the advantages of simple structure, small size, high efficiency and high power factor.

[0003] In order to make the permanent magnet synchronous motor work more efficiently, it is usually necessary to arrange multiple permanent magnets on the rotor of the permanent magnet synchronous motor so that the motor can achieve higher magnetic power even when running at low speed, and at the same time, the output power of the motor can be improved. For example, the Chinese patent with publication number CN211456837U in the related technology proposes a permanent magnet synchronous motor rotor structure for new energy vehicles, which has multiple groups of magnet parts arranged on the rotor body, each group of magnet parts includes two magnet slots, and two grooves are arranged between the two magnet slots of each group of magnet parts, and a hole-shaped part is arranged between the two grooves. In this way, the respective structures, respective arrangement positions, and relative relationships of the magnet slots, grooves, and hole-shaped parts are changed, which will not change the core area of ​​the main magnetic circuit, but can achieve the change of the flow path of the main magnetic flux, thereby effectively weakening the harmonic content of the air gap magnetic density and reducing the noise of the drive motor.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: the permanent magnet synchronous motor is mainly composed of various components such as a rotor, an end cover and a stator. The rare earth permanent magnet synchronous motor has the characteristics of high power torque density. The commonly used permanent magnet is neodymium iron boron material, which is widely used. However, with the popularization of electric vehicles and hybrid vehicles, the demand for motors and permanent magnets continues to increase, and the price of permanent magnets with neodymium iron boron as the main raw material continues to rise. The use of multiple neodymium iron boron permanent magnets installed in the rotor of the motor will cause a significant increase in the cost of the motor. Moreover, providing multiple special-shaped cavities in the rotor of the motor for loading permanent magnets will not only increase the design cost of the rotor, but also increase the production cost of the permanent magnets. It is inconvenient to use and cannot meet the actual use needs, thereby reducing the use efficiency and effect of the permanent magnet synchronous motor rotor. Utility Model Content

[0005] In order to solve the problem of rising prices of permanent magnets whose main raw material is neodymium iron boron, multiple neodymium iron boron permanent magnets are installed in the rotor of the motor, which will cause a significant increase in the cost of the motor. In addition, multiple special-shaped cavities for loading permanent magnets are provided in the rotor of the motor, which will not only increase the design cost of the rotor, but also increase the production cost of the permanent magnets. The present application provides a rare earth-reduced embedded permanent magnet synchronous motor rotor structure.

[0006] The present application provides a rare earth-less embedded permanent magnet synchronous motor rotor structure adopts the following technical solution:

[0007] A rare earth-less embedded permanent magnet synchronous motor rotor structure, comprising a rotor core, wherein a plurality of groups of magnet cavities are arranged on the inner side of the rotor core, each group of magnet cavities are arranged in a V-shape, the number of the magnet cavities in each group is two, and a neodymium iron boron is arranged on the inner side of each magnet cavity, a plurality of groups of fixed square grooves are arranged on the inner side of the rotor core, the number of the fixed square grooves in each group is two, the two fixed square grooves in each group are arranged symmetrically up and down, the two fixed square grooves in each group are respectively arranged between the two magnet cavities in each group, a ferrite is arranged on the inner side of each fixed square groove, and a protective frame is arranged on the outer side of each ferrite;

[0008] The rotor core is provided with a heat dissipation mechanism for dissipating the heat of the rotor core, the rotor core is provided with a mounting mechanism for limiting the ferrite, the rotor core is provided with a disassembly and assembly mechanism for disassembly and assembly of the protective frame, and the outer side of the rotor core is also provided with a stator mechanism for protecting the rotor core.

[0009] By adopting the above technical scheme, by setting multiple groups of magnet cavities on the inner side of the rotor core, multiple NdFeB can be fixed on the inner side of the rotor core. Multiple NdFeB are evenly arranged in the circumferential direction on the inner side of the rotor core, which can ensure the reluctance torque of the permanent magnet synchronous motor, improve the power density of the permanent magnet synchronous motor, and widen the weak magnetic speed regulation range of the permanent magnet synchronous motor. At the same time, two fixed square grooves are set between each group of two magnet cavities, and multiple ferrites can be fixed on the inner side of the rotor core, so multiple ferrites are also evenly arranged in the circumferential direction on the inner side of the rotor core. By increasing the ferrite, the use of NdFeB can be reduced, thereby reducing the production cost of the rotor core. At the same time, reducing the use of NdFeB on the inner side of the rotor core can reduce the no-load air gap magnetic flux density, which is beneficial to the high-speed operation of the motor and the weak magnetic speed increase, and can effectively reduce the cost of permanent magnets, thereby reducing the cost of the motor. Each group of magnet cavities is designed to be V-shaped, which can reduce the design cost of separately processing NdFeB to form the corresponding V-shape.

[0010] The heat dissipation mechanism can make the rotor core have the effect of heat dissipation, so as to prevent the permanent magnet synchronous motor from being damaged due to excessive temperature during use of the rotor core. The ferrite can be limited and fixed by the installation mechanism, and the ferrite can be limited on the inner side of the rotor core to ensure the effect of using the ferrite. The protective frame can be installed or disassembled by the disassembly and assembly mechanism, and the protective frame can be stably installed on the outer side of the ferrite to ensure the effect of the protective frame on the protection and limitation of the ferrite. The rotor core can be hidden and protected by the stator mechanism.

[0011] Optionally, the heat dissipation mechanism includes a first heat dissipation layer fixed on the inner side of the rotor core, a corrosion-resistant layer is arranged on the inner side of the first heat dissipation layer, a heat dissipation ring is arranged on the inner side of the corrosion-resistant layer, rotor teeth are arranged on the outer side of the rotor core, a second heat dissipation layer is arranged on the outer side of the rotor teeth, and a wear-resistant layer is arranged on the outer side of the second heat dissipation layer.

[0012] By adopting the above technical scheme, the rotor core can have a heat dissipation effect through the first heat dissipation layer, the rotor core can have a corrosion-resistant effect through the corrosion-resistant layer, the heat dissipation effect of the rotor core can be enhanced through the heat dissipation ring, and the heat generated by the rotor core when working can be quickly discharged. The second heat dissipation layer can have a heat dissipation effect on multiple rotor teeth to ensure the heat dissipation effect of the rotor core, and the wear-resistant layer can make the rotor teeth wear-resistant to avoid damage of the rotor teeth due to wear during operation.

[0013] Optionally, each of the protective frames is provided with evenly distributed anti-interference columns on the outside, and a positioning circular hole with a diameter equal to that of the anti-interference column is opened on the inside of the rotor core. The positioning circular holes are evenly distributed on the inside of the rotor core, and the anti-interference columns are located on the inside of the positioning circular holes. Each of the protective frames is movably connected to the rotor core, and a plurality of the anti-interference columns are evenly distributed on the outside of each ferrite, and the anti-interference columns are strong magnetic columns.

[0014] By adopting the above technical solution, the ferrite can be limited by the protective frame to avoid the ferrite from falling off as much as possible. By setting up multiple anti-interference columns with strong magnetic columns, the interference to the ferrite can be reduced and the stability of the ferrite during operation can be improved. At the same time, the protective frame can be installed and positioned by positioning the circular holes and anti-interference columns to increase the speed of installing the protective frame.

[0015] Optionally, the mounting mechanism includes a positioning block fixed to the outside of the ferrite, an annular spring is provided on the inner side of the rotor core, a telescopic rod is provided on the inner side of the rotor core, an arc block is provided on the outer side of the annular spring, the telescopic rod is fixedly connected to the arc block, the telescopic rod is located on the inner side of the annular spring, a positioning square groove is provided on the inner side of the rotor core, the positioning block is located on the inner side of the positioning square groove, arc grooves are provided on both sides of the positioning block, and the arc block is clamped with the arc groove.

[0016] By adopting the above technical scheme, the ferrite can be installed and positioned by the positioning block and the positioning square groove to ensure the speed of ferrite installation. Because the ferrite is connected to the rotor core through the positioning block, the positioning square groove, the annular spring, the telescopic rod, the arc block and the arc groove, the annular spring can be compressed by pulling the ferrite, so that the arc block is separated from the arc groove, and the ferrite loses its limit, so that the ferrite can be pulled out from the inner side of the rotor core for disassembly and replacement. At the same time, through the connection and coordination between the positioning block, the positioning square groove, the annular spring, the telescopic rod, the arc block and the arc groove, the ferrite can be stably installed on the inner side of the rotor core, avoiding the phenomenon of ferrite falling off during use, so as to ensure the stability of ferrite use.

[0017] Optionally, the disassembly and assembly mechanism includes a fixed block fixed to the outside of the rotor core, a threaded block is provided on the inner side of the fixed block, the inner side of the threaded block is threadedly connected to a threaded rod, an installation clamp block is provided on the outer side of the threaded rod, a movable turning handle is provided on the outer side of the threaded rod, an installation clamp groove is opened on the inner side of the protective frame, and the installation clamp block is clamped in the installation clamp groove.

[0018] By adopting the above technical scheme, the threaded rod and the mounting clamp can be driven to rotate in turn by rotating the movable handle. Since the threaded block is threadedly connected to the threaded rod, the mounting clamp will be driven to rotate left and right, so that the mounting clamp is separated from the protective frame, and the protective frame loses its limit. Thus, the protective frame can be disassembled, so that the protective frame can be disassembled and replaced first. At the same time, through the cooperation of multiple anti-interference columns, multiple positioning circular holes, fixed blocks, threaded blocks, threaded rods, mounting clamps and mounting clamp grooves, the protective frame can be stably installed on the outside of the ferrite, avoiding the protective frame from falling off during the process of limiting the ferrite, so as to ensure the effect of the protective frame on limiting the ferrite.

[0019] Optionally, the stator mechanism includes a motor shaft fixed on the inner side of a heat dissipation ring, a stator body movably connected to the outer side of the motor shaft, stator teeth are arranged on the inner side of the stator body, a third heat dissipation layer is arranged on the outer side of the stator teeth, a heat insulation layer is arranged on the outer side of the third heat dissipation layer, and a rolling bearing is arranged on the outer side of the motor shaft.

[0020] By adopting the above technical solution, the stator teeth can have a heat dissipation effect through the third heat dissipation layer, thereby preventing the heat of the stator teeth from affecting the rotor teeth and the rotor core. The heat insulation layer of the iron sheet layer can make the stator teeth have a heat insulation effect, thereby preventing the heat of the stator teeth from being transferred to the rotor teeth. The two rolling bearings can improve the stability of the motor shaft rotation. By setting the stator body, the rotor core can be protected.

[0021] Optionally, the rotor teeth are evenly distributed on the outside of the rotor core, a heat dissipation groove is formed between two adjacent rotor teeth, the wear-resistant layer is movably connected to the thermal insulation layer, the stator body is composed of an outer shell, a top cover and a bottom cover, the stator teeth are evenly distributed on the inner side of the stator body, and a stator slot is formed between two adjacent stator teeth.

[0022] By adopting the above technical scheme, the heat dissipation effect of the rotor core can be further enhanced through the heat dissipation grooves formed by the multiple rotor teeth, the stator slots formed by the multiple stator teeth can make the stator body have the heat dissipation effect, and the rotor core can be hidden and protected by providing a stator body composed of an outer shell, a top cover and a bottom cover to ensure the effect of the use of the rotor core.

[0023] Optionally, the first heat dissipation layer, the second heat dissipation layer and the third heat dissipation layer are all aluminum alloy layers, the corrosion-resistant layer is a copper alloy layer, the wear-resistant layer is a titanium alloy layer, the thermal insulation layer is an iron sheet layer, and the heat dissipation ring is a silver alloy.

[0024] By adopting the above technical scheme, the rotor core can have a heat dissipation effect through the first heat dissipation layer of the aluminum alloy layer, the rotor core can have a corrosion-resistant effect through the corrosion-resistant layer of the copper alloy layer, the heat dissipation effect of the rotor core can be enhanced through the heat dissipation ring, and the heat generated by the rotor core during operation can be quickly discharged; the second heat dissipation layer of the aluminum alloy layer can have a heat dissipation effect on multiple rotor teeth to ensure the heat dissipation effect of the rotor core; the wear-resistant layer of the titanium alloy layer can make the rotor teeth wear-resistant to avoid damage to the rotor teeth due to wear during operation; the heat-insulating layer of the iron sheet layer can make the stator teeth have a heat-insulating effect to avoid the heat of the stator teeth being transferred to the rotor teeth.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. By arranging multiple groups of magnet cavities on the inner side of the rotor core, multiple NdFeB magnets can be fixed on the inner side of the rotor core. Each group of magnet cavities is designed into a V shape, which can reduce the design cost of separately processing NdFeB magnets to form the corresponding V shape. Multiple NdFeB magnets are evenly arranged in the circumferential direction on the inner side of the rotor core, which can ensure the reluctance torque of the permanent magnet synchronous motor, improve the power density of the permanent magnet synchronous motor, and widen the weak magnetic speed regulation range of the permanent magnet synchronous motor. At the same time, two fixed square grooves are arranged between each group of two magnet cavities, and multiple ferrites can be fixed on the inner side of the rotor core. Therefore, multiple ferrites are also evenly arranged in the circumferential direction on the inner side of the rotor core. By increasing the ferrite, the use of NdFeB magnets can be reduced, thereby reducing the production cost of the rotor core. At the same time, reducing the use of NdFeB magnets on the inner side of the rotor core can reduce the no-load air gap magnetic flux density, which is beneficial to the high-speed operation of the motor and the weak magnetic speed increase, and can effectively reduce the cost of permanent magnets, thereby reducing the cost of the motor.

[0027] 2. The combined excitation method of multiple NdFeB and multiple ferrites is adopted, wherein the NdFeB and ferrite adopt V-shaped magnetic concentration to improve the peak value of the air gap magnetic density of the rotor core, and the alternating tangential magnetization method is adopted to make it comparable to the torque output capacity of the rotor core on the basis of reducing the amount of NdFeB and reducing the cost, reducing the difficulty of machining and manufacturing the rotor core, and the leakage magnetic flux of the rotor core is fully utilized. The NdFeB permanent magnet steel on the inner side of the rotor core is not easy to be weakly magnetized. The ferrite can cooperate with NdFeB to make the rotor core have good permanent magnetism. The rotor core can reduce the risk of irreversible demagnetization and improve the reliability of the rotor core. It can not only reduce the amount of rare earth permanent magnet NdFeB and reduce the cost, but also increase the weak magnetic speed regulation range, provide performance similar to that of permanent magnet synchronous motor, reduce the amount of rare earth permanent magnet NdFeB, and reduce the manufacturing cost of the motor;

[0028] 3. The edge of the ferrite can be protected by the protective frame to avoid damage to the edge of the ferrite due to impact. Multiple anti-interference columns can reduce the interference of the ferrite. The threaded rod and the installation clamp can be driven to rotate in turn by rotating the movable handle, which will drive the installation clamp to rotate left and right, so that the installation clamp is separated from the protective frame. The protective frame can be disassembled so that it can be disassembled and replaced first. Through the above principle, the protective frame can be stably installed on the outside of the ferrite to avoid the protective frame from falling off during the process of limiting the protection of the ferrite, so as to ensure The protective frame has a limiting protection effect on the ferrite. The protective frame can be removed according to the above principle. Because the ferrite and the rotor core are connected by the positioning block, the positioning square groove, the annular spring, the telescopic rod, the arc block and the arc groove, the ferrite can be pulled to compress the annular spring, separate the arc block from the arc groove, and make the ferrite lose its limit. Therefore, the ferrite can be pulled out from the inner side of the rotor core for disassembly and replacement. At the same time, the ferrite can also be stably installed on the inner side of the rotor core to avoid the ferrite from falling off during use, so as to ensure the stability of the ferrite. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0030] Figure 2 Appearance diagram of the stator body connection structure in the embodiment of the present application;

[0031] Figure 3 A top view of the stator body connection structure in an embodiment of the present application;

[0032] Figure 4 A top view of the rotor core connection structure in the embodiment of the present application;

[0033] Figure 5Appearance diagram of the protective frame connection structure in the embodiment of the present application;

[0034] Figure 6 Embodiments of the present application Figure 1 Enlarged view of point A in the middle;

[0035] Figure 7 Embodiments of the present application Figure 1 Enlarged view of point B in the middle;

[0036] Figure 8 Embodiments of the present application Figure 4 Enlarged view of point C in the middle.

[0037] Figure numerals: 1. rotor core; 2. first heat dissipation layer; 3. corrosion-resistant layer; 4. heat dissipation ring; 5. rotor teeth; 6. second heat dissipation layer; 7. wear-resistant layer; 8. neodymium iron boron; 9. ferrite; 10. protection frame; 11. anti-interference column; 12. positioning block; 13. annular spring; 14. telescopic rod; 15. arc block; 16. fixed block; 17. threaded block; 18. threaded rod; 19. mounting clamp; 20. movable handle; 21. motor shaft; 22. stator body; 23. stator teeth; 24. third heat dissipation layer; 25. thermal insulation layer; 26. rolling bearing. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-8 This application is described in further detail.

[0039] The present application discloses a rare earth-less embedded permanent magnet synchronous motor rotor structure, referring to Figure 1 , Figure 2 and Figure 3 , including a rotor core 1, wherein a plurality of groups of magnet cavities are arranged on the inner side of the rotor core 1, each group of magnet cavities is arranged in a V shape, and the number of each group of magnet cavities is two, and a neodymium iron boron 8 is arranged on the inner side of each magnet cavity, and a plurality of groups of fixed square grooves are arranged on the inner side of the rotor core 1, and the number of each group of fixed square grooves is two, and each group of two fixed square grooves are arranged symmetrically up and down, and each group of two fixed square grooves are respectively arranged between each group of two magnet cavities, and a ferrite 9 is arranged on the inner side of each fixed square groove, and a protective frame 10 is arranged on the outer side of each ferrite 9; the length of the ferrite 9 is equal to the length of the fixed square groove, and the width of the ferrite 9 is equal to the width of the fixed square groove, and the plurality of neodymium iron borons 8 and the plurality of ferrites 9 are evenly arranged in a circumferential direction on the inner side of the rotor core 1, and the ferrite 9 is movably connected to the protective frame 10, and the neodymium iron boron 8 is fixed on the inner side of the magnet cavity.

[0040] The rotor core 1 is provided with a heat dissipation mechanism for dissipating the heat of the rotor core 1, the rotor core 1 is provided with an installation mechanism for limiting the ferrite 9, the rotor core 1 is provided with a disassembly and assembly mechanism for disassembling and assembling the protective frame 10, and a stator mechanism for protecting the rotor core 1 is also provided on the outside of the rotor core 1.

[0041] The heat dissipation mechanism includes a first heat dissipation layer 2 fixed on the inner side of the rotor core 1, a corrosion-resistant layer 3 is fixedly connected to the inner side of the first heat dissipation layer 2, a heat dissipation ring 4 is fixedly connected to the inner side of the corrosion-resistant layer 3, a rotor tooth 5 is fixedly connected to the outer side of the rotor core 1, a second heat dissipation layer 6 is fixedly connected to the outer side of the rotor tooth 5, and a wear-resistant layer 7 is fixedly connected to the outer side of the second heat dissipation layer 6.

[0042] Reference Figure 5 The outside of each protective frame 10 is fixedly connected with evenly distributed anti-interference columns 11, and the inner side of the rotor core 1 is provided with positioning circular holes with the same diameter as the anti-interference columns 11. The positioning circular holes are evenly distributed on the inner side of the rotor core 1, and the anti-interference columns 11 are located on the inner side of the positioning circular holes. Each protective frame 10 is movably connected to the rotor core 1, and multiple anti-interference columns 11 are evenly distributed on the outside of each ferrite 9, and the anti-interference columns 11 are strong magnetic columns.

[0043] The mounting mechanism includes a positioning block 12 fixed to the outside of the ferrite 9, a ring spring 13 is fixedly connected to the inner side of the rotor core 1, a telescopic rod 14 is fixedly connected to the inner side of the rotor core 1, an arc block 15 is fixedly connected to the outer side of the ring spring 13, the telescopic rod 14 is fixedly connected to the arc block 15, the telescopic rod 14 is located on the inner side of the ring spring 13, the telescopic rod 14 is composed of an inner rod and an outer rod, the inner rod is a solid rod, the outer rod is a hollow rod, the inner rod and the outer rod are slidably connected, a positioning square groove is opened on the inner side of the rotor core 1, the positioning block 12 is located on the inner side of the positioning square groove, arc grooves are opened on the left and right sides of the positioning block 12, the arc block 15 is clamped with the arc groove, the length of the positioning block 12 is equal to the length of the positioning square groove, and the width of the positioning block 12 is equal to the width of the positioning square groove.

[0044] The disassembly and assembly mechanism includes a fixed block 16 fixed to the outside of the rotor core 1, a threaded block 17 is fixedly connected to the inner side of the fixed block 16, a threaded rod 18 is threadedly connected to the inner side of the threaded block 17, a mounting clamp 19 is fixedly connected to the outer side of the threaded rod 18, a movable handle 20 is fixedly connected to the outer side of the threaded rod 18, a mounting clamp groove is provided on the inner side of the protective frame 10, the mounting clamp 19 is clamped with the mounting clamp groove, a threaded hole matched with the outer thread of the threaded rod 18 is provided on the inner side of the threaded block 17, one end of the threaded rod 18 away from the movable handle 20 passes through the fixed block 16 and the threaded block 17 in sequence and extends to the outer side of the mounting clamp block 19, and the fixed block 16 is movably connected to the mounting clamp block 19.

[0045] The stator mechanism includes a motor shaft 21 fixed on the inner side of the heat dissipation ring 4, a stator body 22 is movably connected to the outer side of the motor shaft 21, a stator tooth 23 is fixedly connected to the inner side of the stator body 22, a third heat dissipation layer 24 is fixedly connected to the outer side of the stator tooth 23, a heat insulation layer 25 is fixedly connected to the outer side of the third heat dissipation layer 24, a rolling bearing 26 is arranged on the outer side of the motor shaft 21, rotor teeth 5 are evenly distributed on the outer side of the rotor core 1, a heat dissipation groove is formed between two adjacent rotor teeth 5, the wear-resistant layer 7 is movably connected to the heat insulation layer 25, the stator body 22 is composed of an outer shell, a top cover and a bottom cover, the stator teeth 23 are evenly distributed on the inner side of the stator body 22, a stator slot is formed between two adjacent stator teeth 23, magnetic lines of force are arranged on the outer side of each stator tooth 23, and the top cover and the bottom cover are movably connected to the outer shell.

[0046] The top end of the motor shaft 21 passes through the stator body 22, the rolling bearing 26 and the heat dissipation ring 4 in sequence and extends to the outside of the stator body 22. The number of rolling bearings 26 is two, and the two rolling bearings 26 are fixedly connected to the stator body 22. The number of annular springs 13, telescopic rods 14, arc blocks 15, arc grooves, fixed blocks 16, threaded blocks 17, threaded rods 18, mounting clamps 19, mounting clamp grooves and movable handles 20 are five groups, and each group of annular springs 13, telescopic rods 14, arc blocks 15, arc grooves, fixed blocks 16, threaded blocks 17, threaded rods 18, mounting clamps 19, mounting clamp grooves and movable handles 20 is four. The number of positioning blocks 12 and positioning square grooves is five groups, and the number of positioning blocks 12 and positioning square grooves in each group is two. Each group of two positioning blocks 12 and positioning square grooves is symmetrically arranged up and down, and the fixed block 16 is movably connected to the protective frame 10.

[0047] The first heat dissipation layer 2, the second heat dissipation layer 6 and the third heat dissipation layer 24 are all aluminum alloy layers, the corrosion-resistant layer 3 is a copper alloy layer, the wear-resistant layer 7 is a titanium alloy layer, the heat insulation layer 25 is an iron sheet layer, and the heat dissipation ring 4 is a silver alloy. The two rolling bearings 26 are composed of four parts: an inner ring, an outer ring, a rolling element and a retaining frame. The function of the inner ring is to cooperate with the motor shaft 21 and rotate with the motor shaft 21. The function of the outer ring is to cooperate with the stator body 22 and play a supporting role. The rolling element is evenly distributed between the inner ring and the outer ring with the help of the retaining frame. The retaining frame can make the rolling element evenly distributed, guide the rolling element to rotate and play a lubricating role. The inner ring is fixedly connected to the motor shaft 21, and the outer ring is fixedly connected to the stator body 22. The inner ring and the outer ring are both movably connected to the rolling element and the retaining frame, and the rolling element is movably connected to the retaining frame.

[0048] In addition, by setting up multiple NdFeB magnets 8, the effect of the rotor core 1 generating a magnetic field can be enhanced. By setting up a magnet cavity, the NdFeB magnets 8 can be limited and fixed. By setting up a ferrite 9, the amount of rare earth permanent magnets can be reduced, and the effect of the rotor core 1 generating a magnetic field can be guaranteed. By setting up a fixed square groove, the ferrite 9 can be installed and positioned. By setting up a protective frame 10, the edge of the ferrite 9 can be limited and protected to avoid damage to the edge of the ferrite 9 due to impact as much as possible, and the phenomenon of the ferrite 9 falling off can be avoided as much as possible. By setting up an annular spring 13, the arc block 15 can have a buffering effect. By setting up a telescopic rod 14, the arc block 15 can be limited and buffered to avoid the arc block 15 from moving at will during buffering. By setting up a fixed block 16, the threaded block 17 and the threaded rod 18 can be hidden. By setting up two rolling bearings 26, the stability of the rotation of the motor shaft 21 can be improved.

[0049] The implementation principle of the rotor structure of a rare earth-less embedded permanent magnet synchronous motor in the embodiment of the present application is as follows:

[0050] By arranging multiple groups of magnet cavities on the inner side of the rotor core 1, multiple NdFeB magnets 8 can be fixed on the inner side of the rotor core 1. Each group of magnet cavities is designed to be V-shaped, which can reduce the design cost of separately processing NdFeB magnets 8 to form a corresponding V-shape. Multiple NdFeB magnets 8 are evenly arranged in the circumferential direction on the inner side of the rotor core 1, which can ensure the reluctance torque of the permanent magnet synchronous motor, improve the power density of the permanent magnet synchronous motor, and broaden the weak magnetic speed regulation range of the permanent magnet synchronous motor.

[0051] At the same time, two fixed square grooves are set between each group of two magnet cavities, and multiple ferrites 9 can be fixed on the inner side of the rotor core 1, so multiple ferrites 9 are also arranged uniformly in the circumferential direction on the inner side of the rotor core 1. By increasing the ferrite 9, the use of neodymium iron boron 8 can be reduced, thereby reducing the production cost of the rotor core 1. At the same time, reducing the use of neodymium iron boron 8 on the inner side of the rotor core 1 can reduce the no-load air gap magnetic flux density, which is beneficial to the high-speed operation of the motor and the weak magnetic speed increase, and can effectively reduce the cost of permanent magnets, thereby reducing the production cost of the motor;

[0052] The method of combining multiple NdFeB 8 and multiple ferrites 9 for excitation is adopted, wherein the NdFeB 8 and the ferrites 9 adopt V-shaped magnetic concentration to improve the peak value of the air gap magnetic flux density of the rotor core 1, and the alternating tangential magnetization method is adopted to reduce the amount of NdFeB 8 and reduce the cost so that the torque output capacity of the rotor core 1 can be comparable, thereby reducing the difficulty of machining and manufacturing the rotor core 1, and the leakage magnetic flux of the rotor core 1 is fully utilized. The NdFeB 8 permanent magnet steel on the inner side of the rotor core 1 is not easily weakly magnetized. The ferrites 9 can cooperate with the NdFeB 8 to make the rotor core 1 have good permanent magnetism. The rotor core 1 can reduce the risk of irreversible demagnetization, thereby improving the reliability of the rotor core 1. It can not only reduce the amount of rare earth permanent magnet NdFeB 8 and reduce the cost, but also increase the weak magnetic speed regulation range, provide performance similar to that of the permanent magnet synchronous motor, reduce the amount of rare earth permanent magnet NdFeB 8, and reduce the motor manufacturing cost;

[0053] The edge of the ferrite 9 can be limited and protected by the protection frame 10 to avoid damage to the edge of the ferrite 9 due to impact as much as possible. The interference to the ferrite can be reduced by multiple anti-interference columns 11. When the protection frame 10 needs to be disassembled and replaced, the stator body 22 is first disassembled from the outside of the rotor core 1, and then the threaded rod 18 and the installation clamp 19 can be driven to rotate in turn by rotating the movable handle 20. Because the threaded block 17 is threadedly connected to the threaded rod 18, the installation clamp 19 will be driven to rotate left and right during the rotation of the threaded rod 18, so that the installation clamp 19 is separated from the protection frame 10, and the protection frame 10 loses its limit, so that the protection frame 10 can be disassembled, so that the protection frame 10 can be disassembled and replaced first;

[0054] Through the above principle, through the cooperation between multiple anti-interference columns 11, multiple positioning circular holes, fixing blocks 16, threaded blocks 17, threaded rods 18, mounting clamps 19 and mounting clamp grooves, the protection frame 10 can be stably installed on the outside of the ferrite 9 to prevent the protection frame 10 from falling off during the process of limiting the protection of the ferrite 9, so as to ensure the protection effect of the protection frame 10 and multiple anti-interference columns 11 on the ferrite 9.

[0055] When the ferrite 9 needs to be disassembled and replaced, the protection frame 10 is first disassembled according to the above principle. Since the ferrite 9 is connected to the rotor core 1 through the positioning block 12, the positioning square groove, the annular spring 13, the telescopic rod 14, the arc block 15 and the arc groove, the annular spring 13 can be compressed by pulling the ferrite 9, so that the arc block 15 is separated from the arc groove, and the ferrite 9 loses its limit, so that the ferrite 9 can be pulled out from the inner side of the rotor core 1 for disassembly and replacement;

[0056] Through the above principle, through the connection and cooperation between the positioning block 12, the positioning square groove, the annular spring 13, the telescopic rod 14, the arc block 15 and the arc groove, the ferrite 9 can be stably installed on the inner side of the rotor core 1 to avoid the ferrite 9 from falling off during use, so as to ensure the stability of the ferrite 9 in use.

[0057] Compared with the prior art, the overall structure is simple and easy to use. Ferrite 9 is used in the rotor of the motor to replace part of the rare earth permanent magnet material neodymium iron boron 8 to reduce the amount of rare earth permanent magnets. Because the coercive force and residual magnetic density of non-rare earth permanent magnets are lower than those of rare earth permanent magnets, it is necessary to increase the width and thickness of the non-rare earth permanent magnet material to compensate for the magnetic properties, thereby reducing the production cost of the motor, reducing the design cost of the rotor, reducing the production cost of the permanent magnet, meeting the actual use needs, and improving the use efficiency and use effect of the permanent magnet synchronous motor rotor.

[0058] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rare earth-less embedded permanent magnet synchronous motor rotor structure, characterized in that: The invention comprises a rotor core (1), wherein a plurality of groups of magnet cavities are arranged on the inner side of the rotor core (1), each group of magnet cavities are arranged in a V-shape, each group of magnet cavities has two magnet cavities, each magnet cavity has a neodymium iron boron (8) on the inner side, a plurality of groups of fixed square grooves are arranged on the inner side of the rotor core (1), each group of fixed square grooves has two magnet cavities, each group of two fixed square grooves are arranged symmetrically up and down, each group of two fixed square grooves are arranged respectively between each group of two magnet cavities, each fixed square groove has a ferrite (9) on the inner side, and each ferrite (9) has a protective frame (10) on the outer side; The rotor core (1) is provided with a heat dissipation mechanism for dissipating heat from the rotor core (1), the rotor core (1) is provided with a mounting mechanism for limiting the position of the ferrite (9), the rotor core (1) is provided with a disassembly and assembly mechanism for disassembling and assembling a protection frame (10), and a stator mechanism for protecting the rotor core (1) is also provided on the outer side of the rotor core (1).

2. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 1, characterized in that: The heat dissipation mechanism comprises a first heat dissipation layer (2) fixed to the inner side of a rotor core (1), a corrosion-resistant layer (3) is arranged on the inner side of the first heat dissipation layer (2), a heat dissipation ring (4) is arranged on the inner side of the corrosion-resistant layer (3), rotor teeth (5) are arranged on the outer side of the rotor core (1), a second heat dissipation layer (6) is arranged on the outer side of the rotor teeth (5), and a wear-resistant layer (7) is arranged on the outer side of the second heat dissipation layer (6).

3. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 1, characterized in that: The outer side of each protection frame (10) is provided with uniformly distributed anti-interference columns (11); the inner side of the rotor core (1) is provided with positioning circular holes having a diameter equal to that of the anti-interference columns (11); the positioning circular holes are uniformly distributed on the inner side of the rotor core (1); the anti-interference columns (11) are located on the inner side of the positioning circular holes; each protection frame (10) is movably connected to the rotor core (1); a plurality of anti-interference columns (11) are uniformly distributed on the outer side of each ferrite (9); and the anti-interference columns (11) are strong magnetic columns.

4. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 1, characterized in that: The mounting mechanism comprises a positioning block (12) fixed on the outside of the ferrite (9); an annular spring (13) is arranged on the inner side of the rotor core (1); a telescopic rod (14) is arranged on the inner side of the rotor core (1); an arc block (15) is arranged on the outer side of the annular spring (13); the telescopic rod (14) is fixedly connected to the arc block (15); the telescopic rod (14) is located on the inner side of the annular spring (13); a positioning square groove is provided on the inner side of the rotor core (1); the positioning block (12) is located on the inner side of the positioning square groove; arc grooves are provided on both the left and right sides of the positioning block (12); and the arc block (15) is engaged with the arc grooves.

5. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 1, characterized in that: The disassembly and assembly mechanism comprises a fixed block (16) fixed to the outside of the rotor core (1), a threaded block (17) is arranged on the inner side of the fixed block (16), a threaded rod (18) is threadedly connected to the inner side of the threaded block (17), a mounting clamp block (19) is arranged on the outer side of the threaded rod (18), a movable handle (20) is arranged on the outer side of the threaded rod (18), a mounting clamp groove is opened on the inner side of the protective frame (10), and the mounting clamp block (19) is clamped with the mounting clamp groove.

6. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 2, characterized in that: The stator mechanism comprises a motor shaft (21) fixed on the inner side of a heat dissipation ring (4); a stator body (22) is movably connected to the outer side of the motor shaft (21); stator teeth (23) are arranged on the inner side of the stator body (22); a third heat dissipation layer (24) is arranged on the outer side of the stator teeth (23); a heat insulation layer (25) is arranged on the outer side of the third heat dissipation layer (24); and a rolling bearing (26) is arranged on the outer side of the motor shaft (21).

7. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 6, characterized in that: The rotor teeth (5) are evenly distributed on the outer side of the rotor core (1), a heat dissipation groove is formed between two adjacent rotor teeth (5), the wear-resistant layer (7) is movably connected to the heat insulation layer (25), the stator body (22) is composed of an outer shell, a top cover and a bottom cover, the stator teeth (23) are evenly distributed on the inner side of the stator body (22), and a stator slot is formed between two adjacent stator teeth (23).

8. The rotor structure of a rare earth-reduced permanent magnet synchronous motor according to claim 6, characterized in that: The first heat dissipation layer (2), the second heat dissipation layer (6) and the third heat dissipation layer (24) are all aluminum alloy layers, the corrosion-resistant layer (3) is a copper alloy layer, the wear-resistant layer (7) is a titanium alloy layer, the heat insulation layer (25) is an iron sheet layer, and the heat dissipation ring (4) is a silver alloy.

Images