Motor rotor structure and high-speed motor

Abstract

The application discloses a motor rotor structure and a high-rotating-speed motor, and aims to solve the problems that the conventional brushless motor has a large air gap, resulting in low motor efficiency, or the existing structure has a small air gap but is unreliable and cannot operate at a high speed. The application solves the above technical problems through the following technical scheme: a plurality of ribs are arranged in the circumferential direction of a rotor body, and the ribs are arranged along the axial direction of the rotor body; magnets arranged between adjacent ribs are arranged in fixed grooves arranged on the two sides of the width direction of the ribs; the two sides of the width direction of the magnets are matched with the fixed grooves; the outer surfaces of the plurality of ribs are correspondingly provided with plastic-coated strips, and the plastic-coated strips are wrapped on the outer surfaces of the ribs. The outer surfaces of the ribs are locked through the plastic-coated strips, the plastic-coated strips fill the gaps between the magnets and the ribs, can share the centrifugal force borne by the ribs, play a further limiting role on the magnets, and improve the reliability of the motor rotor as a whole.

Description

Technical Field

[0001] This invention relates to the field of electronic rotor technology, and more specifically, to a motor rotor structure and a high-speed motor. Background Technology

[0002] The air gap size of a brushless motor has a significant impact on its performance, mainly in the following aspects: (1) Dynamic response performance: The smaller the air gap, the greater the electromagnetic force between the stator and rotor, the better the dynamic response performance of the motor, and the higher the control accuracy and reliability; (2) Efficiency: The smaller the air gap, the less power is required to rotate the rotor, and the higher the efficiency of the motor. This is because a smaller air gap reduces power loss; (3) Output torque: The smaller the air gap, the greater the output torque of the motor. The torque is determined by the electromagnetic force, which increases as the air gap decreases; (4) Power factor: As the air gap decreases, the excitation current decreases, and the power factor increases.

[0003] The existing internal rotor brushless motors usually adopt two types of structures: embedded magnetic tiles and surface-mounted magnetic tiles. The analysis of these two types of structures is as follows: (1) Embedded magnetic tile structure: The magnetic tiles are installed inside the rotor laminations. It has high stability and can be used in high speed (10000-40000RPM) environments. However, some magnetic fields are shielded by the iron core, and the actual electrical air gap is relatively large, resulting in low air gap magnetic flux density and low power density. (2) The existing surface-mounted magnetic tile installation structure is mainly that the magnetic tiles are directly glued to the rotor laminations, and then a protective magnetic ring is added on the outside. At the same time, due to the addition of the protective magnetic ring, the actual electrical air gap is relatively large, resulting in low air gap magnetic flux density and low power density. (3) The existing surface-mounted magnetic tile installation structure is mainly that the magnetic tiles are directly glued to the rotor laminations, and then no protective magnetic ring is added on the outside. This structure has better performance, but it can only be used in low speed (below 6000RPM) environments. Once it is in a high speed state for a long time, the magnetic tiles are easy to detach from the rotor, and the service life of the motor is low. Summary of the Invention

[0004] This invention overcomes the shortcomings of conventional brushless motors in the prior art, which suffer from low efficiency due to excessive air gaps, or existing structures with small air gaps but unreliable structures and easy detachment of magnets, resulting in a short service life. It provides a motor rotor structure that features small air gaps, high reliability of magnet mounting on the rotor, and the magnets will not detach from the rotor even at high speeds, enabling continuous high-speed operation and effectively improving the service life of the motor.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a motor rotor structure, comprising:

[0006] The rotor body has several ribs arranged along its circumference and along the axis of the rotor body; fixing grooves are provided on both sides of the ribs in the width direction.

[0007] The magnetic tile is set between adjacent ribs, and the two sides of the magnetic tile in the width direction are matched with the fixing groove. The outer surface of the rib is lower than the outer surface of the magnetic tile.

[0008] The outer surfaces of several ribs are each provided with an envelope, and the two sides of the envelope extend outward to connect with the magnetic tile. The outer surfaces of the envelope and the outer surfaces of the magnetic tile form concentric circles.

[0009] In this application, the magnetic tiles are fixedly mounted on the surface of the rotor body via fixing slots. This allows the fixing slots to effectively limit the movement of the magnetic tiles at high speeds, ensuring stable fixation of the magnetic tiles to the rotor body even at high speeds. An envelope is used to lock the outer surface of the ribs, completely filling the gap between the magnetic tiles and the ribs. This envelope distributes the centrifugal force on the ribs, further limiting the movement of the magnetic tiles and improving the overall reliability of the motor rotor. Furthermore, the outer surfaces of the envelope and the magnetic tiles form a cylindrical surface. When the motor rotor and stator are coupled, the air gap formed by the envelope, magnetic tiles, and the stator is very small, resulting in minimal impact on the magnetic density.

[0010] In existing technologies, the design of a protective magnet ring to increase the reliability of the magnet leads to an increase in the air gap between the stator and rotor, which reduces the magnetic density and consequently reduces the efficiency and other performance characteristics of the motor. The size of the air gap and the reliability of the motor rotor are mutually exclusive. However, in this embodiment, the problem of air gap size and motor rotor stability in the existing technology is perfectly solved. It has the characteristics of simple process, stability and reliability, and can be applied to high-speed operating environments.

[0011] Preferably, at least one end of the envelope body is provided with an envelope ring, and the envelope ring is integrally formed with the envelope body.

[0012] The envelope body and envelope rings form a complete plastic-coated shell. Envelope rings are located at the ends of this shell, abutting against both ends of the rotor body. This further enhances the protective effect of the envelope body on the magnets and ribs, thus improving the overall reliability of the motor rotor operation. Furthermore, because the envelope rings are located at both ends of the rotor body and cover the end faces of the rotor body, they provide axial fixation for the magnets at both ends. This ensures that the magnets are completely enclosed and confined by the fixing grooves and envelope rings, further improving the stability of the magnets fixed to the outside of the rotor body.

[0013] Preferably, with the axis of the rotor body as the center, the angle corresponding to the envelope is A1, and the size of A1 is between 25° and 50°.

[0014] Within this range, the envelope can provide a tight connection while having a small impact on the overall magnetic density, thus significantly improving the reliability of the overall structure while ensuring the magnetic density.

[0015] Preferably, with the axis of the rotor body as the center, the angle corresponding to the width of the rib is A2, and A2 / A1 is between 0.2 and 0.6.

[0016] Within this range, the envelope can provide a tight connection while having a small impact on the overall magnetic density, thus significantly improving the reliability of the overall structure while ensuring the magnetic density.

[0017] Preferably, the thickness of the envelope is between 0.2 mm and 4 mm.

[0018] The thickness of the envelope cannot be too thin, otherwise the strength of the envelope will be insufficient, while if the envelope is too thick, it will affect the density of the entire magnetic field. Therefore, within the above range, an optimal value can be achieved between the strength of the envelope and the density of the entire magnetic field.

[0019] Preferably, several end anchors are provided at positions corresponding to the outer surface of the rib and the envelope, and the end anchors are embedded in the rib.

[0020] By connecting the end anchor to the rib, the strength of the connection between the envelope and the rib is further improved, thus making it more adaptable to the operation of high-speed motors.

[0021] Preferably, the end anchor is an end anchor bar arranged along the length of the reinforcing bar, and the width of the end anchor bar gradually increases in the direction away from the envelope.

[0022] This creates a narrowed "dovetail groove" in the cross-section of the end anchor bar. The dovetail groove shape of the end anchor bar can limit the end anchor bar and effectively prevent it from detaching from the reinforcing bar.

[0023] Preferably, the two sides of the magnetic tile in the width direction are side surfaces, and the outer surface of the magnetic tile and the side surfaces of the magnetic tile are connected by an open corner area, which is an arc surface with a gradually decreasing radius; side pages are provided on both sides of the envelope in the width direction, and the side pages are adapted to the open corner area.

[0024] By connecting the side panels and the open corner area, the contact area between the envelope and the magnetic tile can be increased, thereby improving the connection strength between the envelope and the ribs. This further increases the reliability of the envelope without affecting the overall magnetic density.

[0025] Preferably, with the axis of the rotor body as the center, the angle corresponding to the open angle zone is C, and the size of C is between 10° and 20°.

[0026] Within this range, both the connection strength of the envelope and the magnetic density can be guaranteed.

[0027] Preferably, the envelope is provided with two side anchors on the side near the reinforcing bar, with the two side anchors located on both sides of the reinforcing bar.

[0028] The side anchor not only adheres to the side wall of the rib, but the two ribs also form a clamp, which is only clamped on both sides of the rib, further improving the connection strength between the envelope and the rib, thereby further improving the overall reliability of the motor stator.

[0029] Preferably, the two sides in the width direction of the magnetic tile are side surfaces, which are in close contact with the fixing groove. The edges of the side surfaces and the edges of the fixing groove are provided with chamfered structures, and the side anchors are filled between the chamfered structures of the side surfaces and the fixing groove.

[0030] The side anchors are filled between the chamfered structure of the side surface and the fixing groove, so that the side anchors are firmly gripped on both sides of the rib width direction.

[0031] Preferably, a transition groove is provided between the outer surface and the side surface of the magnetic tile, the reinforcing bar and the transition groove cooperate to form a gap, and the side anchor extends into the gap to form a clamping band, which is tightly fitted with the gap.

[0032] The side anchors extend into the gap to form a clamping band. The two clamping bands on the envelope are symmetrically clamped on both sides of the rib, which improves the connection strength between the envelope and the magnetic tile.

[0033] Preferably, a gap is provided between the magnetic tile and the fixing groove, and the side anchor is a tie that fits into the gap.

[0034] The straps not only adhere to the side walls of the ribs, but the two ribs also form a clamp, which is tightened on both sides of the ribs, further improving the connection strength between the envelope and the ribs, thereby further improving the overall reliability of the motor stator.

[0035] Preferably, an auxiliary anchor groove is provided on the outer side wall of the rotor body near the fixing groove, and an auxiliary anchor strip that cooperates with the auxiliary anchor groove is provided at the end of the tie.

[0036] The auxiliary anchor strip works in conjunction with the auxiliary anchor groove to further improve the reliability between the magnet and the rotor body.

[0037] Preferably, the width of the auxiliary anchor groove gradually increases in the direction away from the envelope.

[0038] The above structure can further improve the tightness of the connection between the auxiliary anchor strip and the auxiliary anchor groove.

[0039] Preferably, the thickness of the envelope is 5% to 20% of the thickness of the magnetic tile.

[0040] Within this thickness range, the envelope can maintain a certain strength while not significantly affecting the overall magnetic density, allowing the motor rotor to maintain a better state.

[0041] Preferably, the envelope tightly encapsulates the rotor body and the magnet into one unit.

[0042] Under normal motor operation, gaps can easily remain between the magnet and the mounting slot due to the stable machining precision. This causes the magnet to vibrate as the motor runs, and prolonged vibration can loosen the connection between the magnet and the mounting slot. After a period of high-speed operation, the magnet may eventually collapse from the mounting slot, causing motor malfunction. The envelope design in this application, located on the outer surface of the ribs and connected to the magnets on both sides, allows for a tight encapsulation of the rotor body and magnets by injection molding after the magnets are installed around the rotor body. This prevents vibration of the magnets during motor operation and improves the overall service life.

[0043] Preferably, the magnetic tile has stepped surfaces at both ends along the rotor body axis, and the envelope ring is adapted to the stepped surfaces.

[0044] The enveloping ring engages with the stepped surface at the end of the magnetic tile, providing axial (parallel to the rotor axis) and radial (perpendicular to the rotor axis) restraint on the magnetic tile. This radial restraint by the enveloping ring reduces centrifugal force on the ribs and the enveloping body, improving the reliability of the motor rotor at high speeds.

[0045] Preferably, four envelopes are provided, and the four envelopes are evenly distributed in the circumferential direction of the rotor body.

[0046] The four envelopes are evenly distributed around the circumference of the rotor body. This ensures that the envelopes have a certain strength while not significantly affecting the overall magnetic density, allowing the motor rotor to maintain an optimal state.

[0047] Preferably, the width of the ribs gradually increases in the direction away from the rotor body.

[0048] The side walls on both sides of the ribs cooperate with the circumferential surface of the rotor body to form a fixing groove, which plays a role in limiting the position of the magnet.

[0049] This application also provides a high-speed motor, including the above-mentioned motor rotor structure, and a stator body sleeved on the outside of the motor rotor structure, the stator body being closely fitted with the motor rotor structure.

[0050] The outer surface of the envelope and the outer surface of the magnet tile form a cylindrical surface. When the motor rotor and motor stator are coupled, the air gap formed between the envelope, magnet tile and motor stator is very small, and has very little impact on the magnetic density.

[0051] In existing technologies, the design of a protective magnet ring to increase the reliability of the magnets during high-speed operation results in an increased air gap between the stator and rotor, reducing the magnetic density and consequently decreasing the efficiency and other performance characteristics of the motor. The size of the air gap and the reliability of the motor rotor are mutually exclusive. However, this embodiment perfectly solves the problem of the air gap size and the stability of the motor rotor in existing technologies. It features simple manufacturing process, stability, and reliability, and can be applied to high-speed operating environments, especially suitable for high-speed motors. Attached Figure Description

[0052] Figure 1 This is an exploded structural diagram of the motor rotor of the present invention.

[0053] Figure 2 This is a schematic diagram of the rotor body of the present invention.

[0054] Figure 3 This is the invention Figure 2 A magnified view of a portion of the image.

[0055] Figure 4 This is a three-dimensional structural diagram of the magnetic tile of the present invention.

[0056] Figure 5 This is a schematic diagram of the shrinkage groove in another embodiment of the present invention.

[0057] Figure 6 This is a schematic diagram of the ties in another embodiment of the present invention.

[0058] Figure 7 This is a structural schematic diagram of the transition surface facing away from the rib in another embodiment of the present invention.

[0059] Figure 8 This is a schematic diagram of the transition surface facing the rib in another embodiment of the present invention.

[0060] Figure 9 This is a schematic diagram of the structure in Embodiment 6 of the present invention.

[0061] Figure 10 This is a schematic diagram of the structure in Embodiment 7 of the present invention.

[0062] In the figure: 1. Rotor body, 11. Reinforcing groove, 111. Auxiliary anchor, 12. First gap, 13. Second gap, 14. Third gap;

[0063] 2. Magnetic tile, 21. Stepped surface, 22. Side surface, 23. Outer surface, 24. Inner surface, 25. Shrinkage groove, 251. First side surface, 252. Second side surface, 26. Transition surface, 27. Open corner area;

[0064] 3. Rib; 31. Fixing groove; 311. Side groove; 32. Connecting groove;

[0065] 4. Envelope, 401. End anchor, 402. Side anchor, 4021. Filler joint, 4022. Auxiliary anchor, 4023. Lacing, 41. Envelope ring, 42. Side leaf;

[0066] 5. Shaft; 51. Fan blade;

[0067] 6. Stator body; 61. Positioning slot; 62. Coil;

[0068] 7. Cable tray; 71. Positioning block;

[0069] 8. Front cover;

[0070] 9. Back cover. Detailed Implementation

[0071] The technical solution of the present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0072] Example 1: As Figures 1 to 10 As shown, a motor rotor structure includes: a rotor body 1 and a plurality of magnetic tiles 2 disposed around the rotor body 1.

[0073] The rotor body 1 has several ribs 3 arranged along its circumference, and the ribs 3 are all arranged along the axial direction of the rotor body 1; fixing grooves 31 are provided on both sides of the ribs 3 in the width direction. The rotor body 1 is assembled by overlapping several rotor laminations.

[0074] Magnet tiles 2 are disposed between adjacent ribs 3. The two sides of the magnet tiles 2 in the width direction cooperate with the fixing grooves 31, and the outer surface of the ribs 3 is lower than the outer surface of the magnet tiles 2. That is to say, when the magnet tiles 2 rotate around the axis of the rotor body 1, they form a rotating surface, and the surface of the magnet tiles 2 is located in this rotating surface. Several magnet tiles 2 are distributed on the periphery of the rotor body 1, forming a motor rotor together with the rotor body 1.

[0075] Each of the outer surfaces of several ribs 3 is provided with an envelope 4, which covers the outer surface of the ribs 3. The two sides of the envelope 4 extend outward and connect with the magnetic tile 2. The outer surface of the envelope 4 and the outer surface of the magnetic tile 2 form concentric circles. Specifically, in this embodiment, the outer surface of the envelope 4 and the outer surface of the magnetic tile 2 cooperate to form the same cylindrical surface, and the axis of the cylindrical surface coincides with the axis of the rotor body 1. Therefore, when the motor rotor and the motor stator are in contact, the air gap between the motor rotor and the motor stator can be very small, thereby improving the power of the motor.

[0076] In one embodiment, with the axis of the rotor body 1 as the center, the angle corresponding to the envelope 4 is A, and the value of A is between 25° and 50°. Within this range, the envelope 4 can play a tight connecting role, while having little impact on the overall magnetic density. Under the premise of ensuring magnetic density, it can significantly improve the reliability of the overall structure.

[0077] In one embodiment, with the axis of the rotor body 1 as the center, the angle corresponding to the width of the rib is A2, and A2 / A1 is between 0.2 and 0.6. Within this range, the envelope 4 can provide a tight connection while having a small impact on the overall magnetic density, thus significantly improving the reliability of the overall structure while ensuring the magnetic density.

[0078] In one embodiment, the thickness T of the envelope 4 is between 0.2 mm and 4 mm. The thickness of the envelope 4 cannot be too thin, otherwise the strength of the envelope 4 will be insufficient, while if the envelope 4 is too thick, it will affect the density of the entire magnetic field. Therefore, within the above range, an optimal value can be achieved between the strength of the envelope 4 and the density of the entire magnetic field.

[0079] In one embodiment, the thickness of the envelope 4 is 5% to 20% of the thickness of the magnetic tile. Within this thickness range, the envelope 4 can maintain a certain strength while not significantly affecting the overall magnetic density, allowing the motor rotor to maintain a better state.

[0080] In one embodiment, four envelope bodies 4 are provided, and the four envelope bodies 4 are evenly distributed in the circumferential direction of the rotor body. Correspondingly, four ribs are provided on the outer surface of the rotor body 1.

[0081] In this embodiment, the magnetic tile 2 is fixedly mounted on the surface of the rotor body 1 via a fixing groove 31. This allows the fixing groove 31 to effectively limit the magnetic tile 2 at high speeds, ensuring that the magnetic tile 2 remains stably fixed to the periphery of the rotor body 1 even at high speeds. However, during normal motor operation, due to the stable machining precision, a gap may easily remain between the magnetic tile 2 and the fixing groove 31. This gap causes the magnetic tile 2 to vibrate as the motor operates. Prolonged vibration can loosen the magnetic tile 2 from the fixing groove 31, and after a certain period of high-speed operation, the magnetic tile 2 may collapse from the fixing groove 31, causing motor malfunction.

[0082] The envelope 4 in this application is located on the outer surface of the rib 3, and both sides of the envelope 4 are connected to the magnet 2. After the magnet 2 is installed around the rotor body 1, an envelope 4 is formed around the rib 3 by injection molding, so that the envelope 4 tightly encapsulates the rotor body and the magnet 2 into one unit, thereby preventing the magnet 2 from vibrating during motor operation and improving the overall service life. Furthermore, during high-speed operation of the motor rotor, the limiting of the magnet 2 is mainly achieved through the fixing groove 31. That is to say, under high-speed rotor operation, the centrifugal force borne by the rib 3 is very large, and the envelope 4 can share the centrifugal force borne by the rib 3, further stabilizing the magnet 2 and improving the overall reliability of the motor rotor. The outer surface of the envelope 4 and the outer surface of the magnet 2 form a cylindrical surface. When the motor rotor and motor stator are engaged, the air gap formed between the envelope 4, the magnet 2, and the motor stator is very small, and the impact on the magnetic density is minimal. It should be noted that the envelope 4 formed by injection molding of injection molding material mentioned in this application can also be formed by using a single-component or multi-component liquid-solid adhesive filling method.

[0083] In existing technologies, the design of a protective magnet ring to increase the reliability of the magnet 2 during high-speed operation results in an increased air gap between the stator and rotor, reducing the magnetic density and consequently decreasing the efficiency and other performance characteristics of the motor. The size of the air gap and the reliability of the motor rotor are mutually exclusive. However, in this embodiment, the problem of air gap size versus motor rotor stability in existing technologies is perfectly solved. It features simple manufacturing process, stability, and reliability, and can be applied to high-speed operating environments, especially suitable for high-speed motors.

[0084] In one embodiment, to further improve the stability of the envelope 4 fixedly disposed on the outside of the rotor body 1, at least one end of each of the envelope 4 is connected by an envelope ring 41. When one end of the envelope 4 is provided with an envelope ring 41, the other end can be provided with an encapsulation plate or other structure to encapsulate the rotor body 1. In this embodiment, both ends of the envelope 4 are connected by envelope rings 41. The envelope 4 and envelope rings 41 are simultaneously formed into a complete plastic-coated shell by injection molding. The envelope rings 41 abut against both ends of the rotor body 1, further improving the blocking effect of the envelope 4 on the magnet 2 and the ribs 3, and further improving the overall reliability of the motor rotor operation. Furthermore, since the envelope rings 41 are disposed at both ends of the rotor body 1 and cover the end faces of the rotor body 1, they play an axial fixing role on the magnet 2 at both ends of the rotor body 1. This makes the magnet 2 completely wrapped and limited by the fixing grooves 31 and the envelope rings 41, further improving the stability of the magnet 2 fixed on the outside of the rotor body 1.

[0085] In one embodiment, the width of the rib 3 gradually increases away from the rotor body 1, giving the cross-section of the rib 3 a dovetail-like shape. This causes the side walls of the rib 3 to be inclined, and the side walls of the rib 3 mate with the circumferential surface of the rotor body 1 to form a fixing groove 31, which limits the movement of the magnet 2. The included angle between the side walls of the rib 3 is B, which is between 90° and 125°.

[0086] In this embodiment, the magnetic tile 2 is fixedly mounted on the surface of the rotor body 1 through the fixing groove 31, so that the fixing groove 31 can effectively limit the magnetic tile 2 at high speed, and the magnetic tile 2 can still be very stably fixed on the periphery of the rotor body 1 at high speed.

[0087] The outer surface of the rib 3 is locked by the envelope 4, which completely fills the gap between the magnet 2 and the rib 3. The envelope 4 can share the centrifugal force on the rib 3 and further limit the magnet 2, thus improving the overall reliability of the motor rotor. Moreover, the outer surface of the envelope 4 and the magnet 2 form a cylindrical surface. When the motor rotor and the motor stator are engaged, the air gap formed by the envelope 4, the magnet 2 and the motor stator is very small, and the impact on the magnetic density is minimal.

[0088] The envelope 4 and envelope ring 41 form a complete plastic-coated shell. Envelope rings 41 are provided at both ends of this plastic-coated shell, abutting against both ends of the rotor body 1. This further enhances the resisting effect of the envelope 4 on the magnet 2 and the ribs 3, thereby improving the overall reliability of the motor rotor operation. Furthermore, since the envelope rings 41 are located at both ends of the rotor body 1 and cover the end faces of the rotor body 1, they provide axial fixation for the magnet 2 at both ends of the rotor body 1. This ensures that the magnet 2 is completely enclosed and limited by the fixing grooves 31 and envelope rings 41, further improving the stability of the magnet 2 fixed to the outside of the rotor body 1.

[0089] Existing technologies use protective magnet rings to increase the reliability of the magnets, which increases the air gap between the stator and rotor, reducing magnetic density and consequently lowering motor efficiency and other performance characteristics. This creates a situation where the size of the air gap and the reliability of the motor rotor are mutually exclusive. This application, however, perfectly solves the problem of air gap size versus motor rotor stability in existing technologies. It features simple manufacturing processes, stable and reliable operation, and can be applied to high-speed operating environments. This application enables high-speed brushless motors to save 15-30% of materials compared to conventional motors under the same power, speed, and torque conditions. This type of motor has a wide range of applications and is used extensively, significantly reducing carbon emissions.

[0090] Example 2: This example differs from Example 1 in that, to further improve the stability between the reinforcing rib 3 and the envelope 4, several end anchors 401 are provided at positions corresponding to the outer surface of the envelope 4 and the reinforcing rib 3, and the end anchors 401 are embedded in the reinforcing rib 3. The connection between the end anchors 401 and the reinforcing rib 3 is achieved through the connection between them, thereby further improving the strength of the connection between the envelope 4 and the reinforcing rib 3, thus making it more adaptable to the operation of high-speed motors.

[0091] Several connecting grooves 32 are provided on the outer surface of the reinforcing bar 3 along its width direction. The connecting grooves 32 are provided along the length direction of the reinforcing bar 3, and the end anchors 401 are tightly disposed in the connecting grooves 32.

[0092] like Figure 3 As shown, in this embodiment, the connecting groove 32 has two sections. The end anchor 401, like the envelope 4 and envelope ring 41, is formed in a single injection molding process. Injection molding material is injected into the connecting groove 32 to form the end anchor 401; that is, the envelope 4, envelope ring 41, and end anchor 401 are integrally molded. The cooperation between the end anchor 401 and the connecting groove 32 increases the contact area between the envelope 4 and the reinforcing rib 3, thereby improving the connection strength and providing a more stable limiting effect for the magnetic tile 2.

[0093] In one embodiment, the width of the connecting groove 32 gradually decreases towards the direction away from the rotor body 1, so that the cross-section of the connecting groove 32 forms a dovetail groove with a narrowing opening. Correspondingly, the width of the end anchor 401 gradually increases towards the direction away from the envelope, thereby limiting the end anchor 401 and effectively preventing the connecting strip from detaching from the rib 3, thus improving the connection strength between the end anchor 401 and the connecting groove 32. Of course, the cross-section of the end anchor 401 can also be set into other shapes, including but not limited to serrated or other irregular structures that increase the contact area between the envelope 4 and the rib 3.

[0094] Example 3: As Figure 2 or Figure 3 As shown, this embodiment is similar in structure to Embodiment 1 or Embodiment 2, except that the two sides of the magnetic tile 2 in the width direction are side surfaces 22, and the inner and outer sides of the magnetic tile 2 are the inner side surface 24 and the outer side surface 23, respectively. The outer side surface 23 of the magnetic tile 2 and the side surface 22 are connected by an open angle region 27. The open angle region 27 is an arc surface with a radius gradually decreasing around the axis of the rotor body 1. Side leaves 42 are provided on both sides of the envelope 4 in the width direction. The side leaves 42 are adapted to the open angle region 27, and the thickness of the side leaves 42 gradually decreases in the direction away from the envelope 4.

[0095] In one embodiment, the angle corresponding to the open angle region 42 is C, and the size of C is between 10° and 20°.

[0096] The connection between the side panel 42 and the open corner area 27 increases the contact area between the envelope 4 and the magnetic tile 2, thereby improving the connection strength between the envelope 4 and the rib 3. This further increases the reliability of the envelope 4 without affecting the overall magnetic density.

[0097] Example 4: Figures 3 to 9 As shown, this embodiment is similar in structure to any one of the embodiments 1 to 4. The difference is that a number of reinforcing grooves 11 are provided on the outer side wall of the rotor body 1. When the envelope 4 is formed during injection molding, reinforcing strips are formed in the reinforcing grooves 11 at the same time, thereby further improving the stability of the connection between the magnet 2 and the rotor body 1.

[0098] The cross-section of the reinforcing groove 11 can be "dovetail" or other shapes, including but not limited to serrated or other irregular structures that increase the contact area between the reinforcing strip and the reinforcing groove 11.

[0099] In one embodiment, such as Figure 3 As shown, two side anchors 402 are provided on the side of the envelope 4 near the reinforcing bar 3, and the two side anchors 402 are located on both sides of the reinforcing bar 3. Specifically, as... Figure 3As shown, the side surface 22 of the magnetic tile 2 is in close contact with the fixing groove 31. Chamfer structures are provided on both sides of the magnetic tile 2, and chamfer structures are also provided on both sides of the width direction of the reinforcing bar 3. An inwardly recessed filling gap 4021 is formed between the two chamfer structures, and the side anchor 402 is filled in the filling gap 4021.

[0100] In one embodiment, such as Figure 5 As shown, a contraction groove 25 is provided between the side surface 22 and the outer surface 23. The contraction groove 25 and the rib 3 cooperate to form a gap, which is the second gap 13. The contraction groove 25 includes a first side surface 251 and a second side surface 252 that are connected to each other. The first side surface 251 and the second side surface 252 form an L-shape. The first side surface 251 is connected to the side surface 22, and the second side surface 252 is connected to the outer surface 23. The side anchor 402 extends into the gap to form a clamping band. The two clamping bands on the envelope 4 are symmetrically clamped on both sides of the rib 3, which improves the connection strength between the envelope 4 and the magnetic tile 2. After the side anchor 402 fills the second gap 13, it plays a limiting role for the magnetic tile 2, improving the stability of the magnetic tile 2 installed outside the rotor body 1, so that the motor can adapt to higher speeds. In this embodiment, the second gap 13 does not penetrate the entire fixing groove 31, but only forms a side anchor 402 in a local area, which can also play the role of clamping the rib. It should be noted that the second gap 13 can be filled with the same material as the envelope 4, forming a whole with the envelope 4; the second gap 13 can also be filled with a single-component or multi-component liquid-solid adhesive. The use of liquid-solid adhesive has the following advantages: First, it can play an adhesive role, so that the magnetic tile 2 and the rib 3 can be firmly bonded together. The liquid-solid adhesive can fill the second gap 13, so that the gap between the magnetic tile 2 and the rib is completely filled, and the magnetic tile 2 is firmly locked between the two ribs 3, effectively preventing the magnetic tile 2 from vibrating and improving the overall service life of the motor.

[0101] In one embodiment, such as Figure 6As shown, a gap, the first gap 12, is provided between the side surface 22 and the fixing groove 31. The side anchor 402 extends into the first gap 12 to form a strap 4023 that mates with the first gap 12. The strap 4023 separates the magnetic tile 2 from the rib 3. The strap 4023 is located on both sides of the rib 3, increasing the connection area between the strap 4023 and the magnetic tile 2 and the rib 3. This allows the envelope 4 to be more stably positioned on the outer surface of the rib 3, thus providing better positioning for the magnetic tile 2. Furthermore, since the cross-section of the rib 3 is "dovetail-shaped," when the strap 4023 is arranged along the rib 3, the strap 4023 not only adheres to the side wall of the rib 3, but the two ribs 3 also form a clamp, clamping the two sides of the rib 3. This further improves the connection strength between the envelope 4 and the rib 3, thereby further improving the overall reliability of the motor stator. It should be noted that the first gap 12 can be filled with the same material as the envelope 4 to form a tie 4023, forming an integral whole with the envelope 4; the first gap 12 can also be filled with a single-component or multi-component liquid-solid adhesive. Using liquid-solid adhesive has the following advantages: First, it can play an adhesive role, so that the magnetic tile 2 and the rib 3 can be firmly bonded together. The liquid-solid adhesive can fill the first gap 12 to form a tie 4023, so that the gap between the magnetic tile 2 and the rib is completely filled, and the magnetic tile 2 is firmly locked between the two ribs 3, effectively preventing the magnetic tile 2 from vibrating and improving the overall service life of the motor.

[0102] In one embodiment, such as Figure 6As shown, an auxiliary anchor groove 111 is provided on the outer side wall of the rotor body 1 near the fixing groove 31. The first gap 12 communicates with the auxiliary anchor groove 111. The tie 4023 extends towards the auxiliary anchor groove 11 and closely cooperates with the auxiliary anchor groove 11 to form an auxiliary anchor strip 4022. During injection molding, the injection molding material fills the first gap 12 and the auxiliary anchor groove 111, forming the auxiliary anchor strip 4022 at the end of the tie 4023. The auxiliary anchor strip 4022 cooperates with the auxiliary anchor groove 111, thereby further improving the reliability between the magnet 2 and the rotor body 1. In this embodiment, the three structures—auxiliary anchor 4022, side anchor 402, and envelope 4—are all integrally injection molded, resulting in a very strong overall structure. The auxiliary anchor 4022 and the auxiliary anchor groove 111 cooperate to form a first locking structure, and the tie 4023 and the first gap 12 form a second locking structure. The first and second locking structures make the connection between the envelope 4 and the reinforcing rib 3 and the magnetic tile 2 more compact, thereby improving the overall strength and enabling this application to be used with higher speed motors. It should be noted that the first gap 12 and the auxiliary anchor groove 111 can be filled with the same material as the envelope 4, forming a whole with the envelope 4; the first gap 12 and the auxiliary anchor groove 111 can also be filled with single-component or multi-component liquid-solid adhesive. The use of liquid-solid adhesive has the following advantages: First, it can play an adhesive role, so that the magnetic tile 2 and the rib 3 can be firmly bonded together. The liquid-solid adhesive can fill the first gap 12 and the auxiliary anchor groove 111, so that the gap between the magnetic tile 2 and the rib is completely filled, and the magnetic tile 2 is firmly locked between the two ribs 3, effectively preventing the magnetic tile 2 from vibrating and improving the overall service life of the motor.

[0103] In one embodiment, the width of the auxiliary anchor groove 111 gradually increases in the direction away from the envelope 4, which can further improve the tightness of the connection between the auxiliary anchor bar 4022 and the auxiliary anchor groove 111.

[0104] In one embodiment, such as Figure 7 and Figure 8 As shown, a transition surface 26 is provided between the outer surface 23 and the inner surface 24. The transition surface 26 is arc-shaped. When the magnetic tile 2 is engaged with the fixing groove 31, the outer surface 23 abuts against the side wall of the fixing groove 31. The opening direction of the arc-shaped transition surface 26 can face towards the rib 3 or away from the rib 3.

[0105] A third gap 14 is formed between the transition surface 26 and the fixing groove 31. After the injection molding material is filled into the third gap 14, it plays a limiting role for the magnetic tile 2, improves the stability of the magnetic tile 2 installed outside the rotor body 1, and can adapt to higher speeds.

[0106] Example 5: Figure 9As shown, this embodiment is similar in structure to that in embodiment 5, except that a side groove 311 is also provided on the side wall of the fixed groove 31, and the side groove 311 is arranged along the axial direction of the rotor body 1.

[0107] The side groove 311 increases the gap between the side surface 22 and the fixed groove 31, allowing the injection molding material to fill the side groove 311 and increasing the strength of the injection molding material. At the same time, the distance between the side wall of the rib 3 and the outer wall of the rib 3 is L. The side groove 311 can shorten the length of L, thereby improving the toughness of the rib 3 without reducing its strength, and thus making it more adaptable to the rapid acceleration of the motor rotor.

[0108] Example 6: Figure 4 As shown, this embodiment is similar in structure to that of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5, except that the magnetic tile 2 has stepped surfaces 21 at both ends along the axis of the rotor body 1. In this embodiment, the stepped surfaces 21 are two-layered, but can be set to any number of layers. The envelope ring 41 is adapted to the stepped surfaces 21. The envelope ring 41 cooperates with the stepped surfaces 21 at the ends of the magnetic tile 2, which can not only limit the magnetic tile 2 in the axial direction (along the direction parallel to the axis of the rotor body 1), but also limit the magnetic tile 2 in the radial direction (along the direction perpendicular to the axis of the rotor body 1). By limiting the magnetic tile 2 in the radial direction through the envelope ring 41, the centrifugal force on the ribs 3 and the envelope body 4 can be reduced, improving the reliability of the motor rotor under high-speed operation.

[0109] Example 7: Refer to Figure 7 As shown, a high-speed motor includes the aforementioned motor rotor structure, and also includes a rotating shaft 5 passing through the axis of the rotor body 1. One end of the rotating shaft 5 is provided with a fan blade 51. When the rotating shaft 5 rotates, it drives the fan blade 51 to rotate, and the air generated by the fan blade 51 cools the motor.

[0110] It also includes a stator body 6 disposed on the outside of the motor rotor structure. The stator body 6 is closely fitted with the motor rotor structure, so that the gap between the stator body 6 and the outer wall of the motor rotor structure is very small. A coil 62 is wound on the stator body 6. The stator body 6 is composed of several stator discs stacked together. Several through-type positioning grooves 61 are provided in the circumferential direction of the stator body 6. The positioning grooves 61 are arranged along the axial direction of the stator body 6. A wire frame 7 is provided at both ends of the stator body 6. A positioning block 71 that cooperates with the end of the positioning groove 61 is provided on the wire frame 7.

[0111] A front cover 8 and a rear cover 9 are respectively provided on the side of the end frame 7 away from the stator body 6.

[0112] The above assembly method enables the formation of a motor with high magnetic density, high motor efficiency, and applicable to high-speed applications.

[0113] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Other variations and modifications may be made without departing from the technical solutions described in the claims.

Claims

1. A motor rotor structure, characterized in that, include: The rotor body has several ribs arranged along its circumference and along the axis of the rotor body; fixing grooves are provided on both sides of the ribs in the width direction. The magnetic tile is set between adjacent ribs, and the two sides of the magnetic tile in the width direction are matched with the fixing groove. The outer surface of the rib is lower than the outer surface of the magnetic tile. The outer surfaces of several ribs are each provided with an envelope, and the two sides of the envelope extend outward and connect with the magnetic tile. The outer surfaces of the envelope and the outer surfaces of the magnetic tile form concentric circles. At least one end of a plurality of envelope bodies is provided with an envelope ring, and the envelope ring is integrally formed with the envelope body; At the positions corresponding to the outer surface of the rib, there are several end anchors, which are embedded in the rib. The end anchor is an end anchor bar set along the length of the reinforcing bar, and the width of the end anchor bar gradually increases in the direction away from the envelope; Several reinforcing grooves are provided on the outer side wall of the rotor body. When the envelope is formed during injection molding, reinforcing strips are simultaneously formed in the reinforcing grooves.

2. The motor rotor structure according to claim 1, characterized in that, With the axis of the rotor body as the center, the angle corresponding to the envelope is A1, and the size of A1 is between 25° and 50°.

3. The motor rotor structure according to claim 2, characterized in that, With the axis of the rotor body as the center, the angle corresponding to the width of the rib is A2, and A2 / A1 is between 0.2 and 0.

6.

4. The motor rotor structure according to claim 1, characterized in that, The thickness of the envelope is T, and T is no greater than 4 mm.

5. The motor rotor structure according to any one of claims 1 to 4, characterized in that, The two sides of the magnetic tile in the width direction are side surfaces. The outer surface of the magnetic tile and the side surfaces of the magnetic tile are connected by an open corner area, which is an arc surface with a gradually decreasing radius. Side pages are provided on both sides of the envelope in the width direction, and the side pages are adapted to the open corner area.

6. The motor rotor structure according to claim 5, characterized in that, With the axis of the rotor body as the center, the angle corresponding to the open angle zone is C, and the size of C is between 10° and 20°.

7. The motor rotor structure according to any one of claims 1 to 4, characterized in that, Two side anchors are provided on the side of the envelope near the reinforcing bar, and the two side anchors are located on both sides of the reinforcing bar.

8. The motor rotor structure according to claim 7, characterized in that, The two sides of the magnetic tile in the width direction are side surfaces, which are in close contact with the fixing groove. The edges of the side surfaces and the edges of the fixing groove are provided with chamfered structures, and the side anchors are filled between the chamfered structures of the side surfaces and the fixing groove.

9. The motor rotor structure according to claim 8, characterized in that, A transition groove is provided between the outer surface and the side surface of the magnetic tile. The ribs cooperate with the transition groove to form a gap. The side anchors extend into the gap to form a clamping band, and the clamping band is tightly fitted with the gap.

10. The motor rotor structure according to claim 7, characterized in that, A gap is provided between the magnetic tile and the fixing groove, and the side anchor is a tie that fits into the gap.

11. The motor rotor structure according to claim 10, characterized in that, An auxiliary anchor groove is provided on the outer side wall of the rotor body near the fixed groove, and an auxiliary anchor strip that cooperates with the auxiliary anchor groove is provided at the end of the tie.

12. The motor rotor structure according to claim 11, characterized in that, The width of the auxiliary anchor groove gradually increases in the direction away from the envelope.

13. The motor rotor structure according to any one of claims 1 to 4, characterized in that, The thickness of the envelope is 5% to 20% of the thickness of the magnetic tile.

14. The motor rotor structure according to any one of claims 1 to 4, characterized in that, The envelope tightly encapsulates the rotor body and the magnet into one unit.

15. The motor rotor structure according to any one of claims 1 to 4, characterized in that, The magnet has stepped surfaces at both ends along the rotor body axis, and the envelope ring is adapted to the stepped surfaces.

16. The motor rotor structure according to any one of claims 1 to 4, characterized in that, There are four envelopes, which are evenly distributed around the circumference of the rotor body.

17. The motor rotor structure according to any one of claims 1 to 4, characterized in that, The width of the ribs gradually increases in the direction away from the rotor body.

18. A high-speed motor, characterized in that, The motor rotor structure includes any one of claims 1 to 17, and further includes a stator body sleeved on the outside of the motor rotor structure, wherein the stator body is closely fitted with the motor rotor structure.

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