Electric motor rotor structure and high-speed electric motor

Abstract

Disclosed in the present invention are an electric motor rotor structure and a high-speed electric motor, which aim to solve the problem in the prior art of conventional brushless electric motors having low efficiency due to an excessively large air gap, or existing structures, despite having a small air gap, being unreliable and thus being incapable of operating at high speeds. The present invention solves the above technical problem by means of the following technical solution: several ribs are provided in the circumferential direction of a rotor main body, and the ribs are disposed in the axial direction of the rotor main body; fixing slots are provided on both sides of each rib in the direction of the width thereof, a magnet is arranged between adjacent ribs, and both sides of each magnet in the direction of the width thereof fit with the corresponding fixing slots; and a plastic covering strip is correspondingly provided on the outer surface of each of the several ribs, and the plastic covering strips cover the outer surfaces of the ribs. The outer surfaces of the ribs are locked by means of the plastic covering strips, and the plastic covering strips fill gaps between the magnets and the ribs, such that a centrifugal force borne by the ribs can be shared, and the magnets are further limited, thereby improving the overall reliability of the electric motor rotor.

Description

Motor rotor structure and high-speed motor TECHNICAL FIELD The present application relates to the technical field of electronic rotor, more particularly, it relates to a motor rotor structure and a high-speed motor. BACKGROUND The air gap size of a brushless motor has a significant impact on performance, mainly in the following aspects: (1) Dynamic response performance: the smaller the air gap, the greater the electromagnetic force between the stator and the 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 the rotating rotor needs, 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, and the torque is determined by the electromagnetic force, which increases with the decrease of the air gap; (4) Power factor: the reduction of the air gap reduces the excitation current, and the power factor increases. The existing inner rotor brushless motor usually adopts two types of structures, namely, embedded magnetic tile and surface-mounted magnetic tile. The two types of structures are analyzed as follows: (1) The embedded magnetic tile structure is installed inside the rotor lamination, which has high stability and can be used in high-speed (10000-40000 RPM) environment, but part of the magnetic field is shielded by the iron core, the actual electrical air gap is relatively large, resulting in low air gap magnetic density and low power density; (2) The existing surface-mounted magnetic tile installation structure mainly uses glue to stick the magnetic tile on the rotor lamination, and then adds a magnetic shield outside. At the same time, due to the addition of the magnetic shield, the actual electrical air gap is relatively large, resulting in low air gap magnetic density and low power density; (3) The existing surface-mounted magnetic tile installation structure mainly uses glue to stick the magnetic tile on the rotor lamination, and then does not add a magnetic shield outside. This structure has good performance, but can only be applied in low-speed (6000 RPM below) environment. Once in high-speed state for a long time, the magnetic tile is easy to separate from the rotor, and the service life of the motor is relatively low. SUMMARY The present application overcomes the problems of the conventional brushless motor in the prior art, i.e., low efficiency due to large air gap, or unreliable structure and easy separation of the magnetic tile from the rotor, resulting in low service life of the motor. The present application provides a motor rotor structure which has small air gap, high reliability of the magnetic tile mounted on the rotor, and the magnetic tile will not separate from the rotor in high-speed operation state, so that the motor can continuously operate at high speed, effectively improving the service life of the motor. In order to solve the above technical problems, the present application adopts the following technical scheme: a motor rotor structure, comprising: A motor rotor structure, characterized in that it comprises: A rotor body, the circumference of the rotor body is provided with a plurality of ribs, and the ribs are arranged along the axis direction of the rotor body; the ribs The two sides of the width direction are provided with fixing grooves; The magnetic tile is arranged between adjacent ribs, and the two sides of the magnetic tile in the width direction are matched with the fixing groove, and the outer surface of the rib is lower than the outer surface of the magnetic tile ; The outer surface of the magnetic tile is matched with the outer surface of the magnetic tile. The outer surface of the envelope body is matched with the outer surface of the magnetic tile to form a concentric circle. In the present application, the magnetic tile is fixedly arranged on the surface of the rotor body through the fixing groove, so that the fixing groove can well limit the magnetic tile in a high speed state, so that the magnetic tile can be stably fixed on the periphery of the rotor body in a high speed state. The outer surface of the rib is locked by the envelope body, which fills the gap between the magnetic tile and the rib, can share the centrifugal force received by the rib, and further limits the magnetic tile to improve the reliability of the motor rotor as a whole. The envelope body and the outer surface of the magnetic tile form a cylindrical surface, and when the motor rotor cooperates with the motor stator, the air gap formed by the envelope body, the magnetic tile and the motor stator is very small, which has little effect on the magnetic density. In the prior art, a magnetic shield ring is designed to increase the reliability of the magnetic tile, which increases the air gap between the stator and the rotor, reduces the magnetic density, and reduces the efficiency and other performance of the motor. The size of the air gap and the reliability of the motor rotor cannot be achieved at the same time. In the present embodiment, the problem of the size of the air gap and the stability of the motor rotor in the prior art is perfectly solved, which has the characteristics of simple process and stable reliability, and can be applied to high-speed operating environment. 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. The envelope body and the envelope ring form a complete plastic shell, and the end of the plastic shell is provided with an envelope ring abutting against the two ends of the rotor body, which further improves the resistance of the envelope body to the magnetic tile and the rib, and further improves the reliability of the motor rotor as a whole. And because the envelope ring is arranged at the two ends of the rotor body and covers the end face of the rotor body, the envelope ring plays a role in axially fixing the magnetic tile at the two ends of the rotor body, so that the magnetic tile is completely wrapped and limited by the fixing groove and the envelope ring, further improving the stability of the magnetic tile fixed on the outer side of the rotor body. Preferably, the angle A1 corresponding to the envelope body is 25° to 50° with the axis of the rotor body as the center. In this range, the envelope body can play a close connection role, and has little effect on the overall magnetic density. Under the premise of ensuring the magnetic density, the overall structural reliability can be significantly improved. Preferably, the angle A2 corresponding to the width of the rib is 0.2 to 0.6 with the axis of the rotor body as the center. In this range, the envelope body can play a close connection role, while the influence on the overall magnetic density is small, and the reliability of the overall structure can be significantly improved under the premise of ensuring the magnetic density. Preferably, the thickness of the envelope body is between 0.2mm and 4mm. The thickness of the envelope body cannot be too thin, otherwise the strength of the envelope body is not enough, and the thickness of the envelope body is too thick, which will affect the density of the whole magnetic field, therefore, in the above range, an optimal value can be reached between the strength of the envelope body and the density of the whole magnetic field. Preferably, a plurality of end anchors are arranged at positions corresponding to the outer surface of the rib, and the end anchors are embedded in the rib. The end anchors are connected with the rib, thereby further improving the connection strength between the envelope body and the rib, and the high-speed motor operation can be better adapted. Preferably, the end anchor is an end anchor strip arranged along the length direction of the rib, and the width of the end anchor strip gradually increases away from the envelope body. The cross section of the end anchor strip forms a dovetail slot with a gradually reduced opening, and the dovetail-shaped end anchor strip can limit the end anchor strip and effectively prevent the end anchor strip from being separated from the rib. Preferably, the two sides of the width direction of the magnetic tile are side surfaces, the outer side surface of the magnetic tile is connected with the side surface of the magnetic tile through an opening angle area, the opening angle area is a circular arc surface with a gradually reduced radius, and a side page is arranged at the two sides of the width direction of the envelope body. The connection between the side page and the opening angle area can increase the contact area between the envelope body and the magnetic tile, thereby improving the connection strength between the envelope body and the rib, and further increasing the reliability of the envelope body without affecting the overall magnetic density. Preferably, the opening angle area corresponds to an angle C with the axis of the rotor body as the center, and the size of C is between 10° and 20°. In this range, the connection strength of the envelope body can be ensured, and the magnetic density can also be ensured. Preferably, two side anchors are arranged on the side of the envelope body close to the rib, and the two side anchors are located on the two sides of the rib. The side anchors are not only adhered to the side wall of the rib, but also form a clamping opening between the two ribs, thereby further improving the connection strength between the envelope body and the rib, and further improving the reliability of the overall motor stator. Preferably, the two sides of the width direction of the magnetic tile are side surfaces, the side surfaces are in close contact with the fixed grooves, the edges of the side surfaces and the edges of the fixed grooves are provided with chamfer structures, and the side anchors are filled between the chamfer structures of the side surfaces and the fixed grooves. The side anchor is filled between the side surface and the chamfer structure of the fixing groove, so that the side anchor is firmly gripped on both sides of the rib width direction. As a preferred, a transition groove is arranged between the outer side surface of the magnetic tile and the side surface, the rib cooperates with the transition groove to form a gap, and the side anchor extends into the gap to form a clamping. The side anchor extends into the gap to form a clamping, and the two clamping symmetrical on the envelope body are clamped on both sides of the rib, thereby improving the connection strength between the envelope body and the magnetic tile. As a preferred, a gap is arranged between the magnetic tile and the fixing groove, and the side anchor is a strap matched with the gap. The strap is not only adhered to the side wall of the rib, but also forms a clamping on both sides of the rib, thereby further improving the connection strength between the envelope body and the rib, and further improving the reliability of the motor stator as a whole. As a preferred, an auxiliary anchor groove is arranged on the outer side wall of the rotor body and close to the fixing groove, and the end of the strap is provided with an auxiliary anchor strip matched with the auxiliary anchor groove. The auxiliary anchor strip cooperates with the auxiliary anchor groove, thereby further improving the reliability between the magnetic tile and the rotor body. As a preferred, the width of the auxiliary anchor groove gradually increases away from the envelope body. The above structure can further improve the tightness of the connection between the auxiliary anchor strip and the auxiliary anchor groove. As a preferred, the thickness of the envelope body is 5% to 20% of the thickness of the magnetic tile. In this thickness range, the envelope body can maintain a certain strength, and the envelope body will not have a large impact on the overall magnetic density, so that the motor rotor can maintain a better state. As a preferred, the envelope body tightly encapsulates the rotor body and the magnetic tile into one. Under normal operation of the motor, due to the stability of the machining precision between the magnetic tile and the fixing groove, a gap is easily left between the magnetic tile and the fixing groove, so that the magnetic tile will vibrate with the operation of the motor. Long-term vibration makes the magnetic tile and the fixing groove loose, and then after a certain period of high-speed operation, the magnetic tile will collapse from the fixing groove, causing the motor to malfunction. The envelope body in the application is arranged on the outer surface of the rib, and the two sides of the envelope body are connected with the magnetic tile. After the magnetic tile is installed on the periphery of the rotor body, a layer of envelope body is arranged on the periphery of the rib by injection molding, so that the envelope tightly encapsulates the rotor body and the magnetic tile into one, thereby avoiding the vibration of the magnetic tile during the operation of the motor, and improving the overall service life. As a preferred, the magnetic tile is provided with a stepped surface at both ends along the axis of the rotor body, and the plastic ring is matched with the stepped surface. The step surface of the envelope ring and the end of the magnetic tile is matched, which can not only limit the magnetic tile in the axial direction (parallel to the rotor body axis), but also limit the magnetic tile in the radial direction (perpendicular to the rotor body axis). By limiting the magnetic tile in the radial direction, the centrifugal force on the rib and the envelope body is reduced, and the reliability of the motor rotor in high-speed operation is improved. Preferably, four envelope bodies are arranged uniformly in the circumferential direction of the rotor body. The four envelope bodies are arranged uniformly in the circumferential direction of the rotor body, which can maintain a certain strength of the envelope body, and the envelope body will not have a great impact on the overall magnetic density, so that the motor rotor can maintain a better state. Preferably, the width of the rib gradually increases away from the rotor body. The side wall on both sides of the rib and the circumferential surface of the rotor body form a fixed groove, which limits the magnetic tile. The application also provides a high-speed motor, which comprises the motor rotor structure and a stator body sleeved outside the motor rotor structure, and the stator body is closely matched with the motor rotor structure. The outer surface of the envelope body and the outer surface of the magnetic tile form a cylindrical surface. When the motor rotor is matched with the motor stator, the air gap formed between the envelope body, the magnetic tile and the motor stator is very small, which has little effect on the magnetic density. In the prior art, a magnetic shield ring is designed to increase the reliability of the magnetic tile in high-speed operation, which increases the air gap between the stator and the rotor, reduces the magnetic density, and reduces the efficiency and other performance of the motor. The size of the air gap and the reliability of the motor rotor cannot be achieved at the same time. The embodiment perfectly solves the problem of the size of the air gap and the stability of the motor rotor in the prior art, has the characteristics of simple process and stable reliability, can be applied to high-speed operation environment, and is especially suitable for high-speed motor. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is an exploded structure diagram of the motor rotor of the application. Fig. 2 is a structure diagram of the rotor body of the application. Fig. 3 is a local enlarged view of Fig. 2 of the application. Fig. 4 is a perspective structure diagram of the magnetic tile of the application. Fig. 5 is a structure diagram of the shrinkage groove in another embodiment of the application. Fig. 6 is a structure diagram of the lacing in another embodiment of the application. Fig. 7 is a structure diagram of the transition surface away from the rib in another embodiment of the application. Fig. 8 is a structure diagram of the transition surface towards the rib in another embodiment of the application. Figure 9 is a schematic diagram of the structure in Embodiment 6 of the present invention. Figure 10 is a schematic diagram of the structure in Embodiment 7 of the present invention. In the figure: 1. Rotor body, 11. Reinforcing groove, 111. Auxiliary anchor, 12. First gap, 13. Second gap, 14. Third gap; 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 angle area; 3. Rib; 31. Fixing groove; 311. Side groove; 32. Connecting groove; 4. Envelope; 401. End anchor; 402. Side anchor; 4021. Filler joint; 4022. Auxiliary anchor; 4023. Laying strap; 41. Envelope ring, 42, side page; 5. Shaft; 51. Fan blade; 6. Stator body; 61. Positioning slot; 62. Coil; 7. Wire frame; 71. Positioning block; 8. Front cover; 9. Back cover. Detailed Implementation The technical solution of the present invention will be further described in detail below through specific embodiments and with reference to the accompanying drawings: Example 1: As shown in Figures 1 to 10, a motor rotor structure includes: a rotor body 1 and a rotor assembly disposed on the rotor body 1. Several magnetic tiles on the periphery 2. 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. 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. The outer surface of each of the plurality of ribs 3 is provided with an envelope 4, which covers the outer surface of the rib 3. The two sides of the envelope 4 extend outwardly and are connected to the magnetic tile 2. The outer surface of the envelope 4 and the outer surface of the magnetic tile 2 form concentric circles. Specifically, the outer surface of the envelope 4 and the outer surface of the magnetic tile 2 in this embodiment 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 matched, the air gap between the motor rotor and the motor stator can be very small, thereby improving the power of the motor. In one embodiment, the angle A corresponding to the envelope 4 is 25° to 50° with the axis of the rotor body 1 as the center. Within this range, the envelope 4 can play a tight connection role while having little effect on the overall magnetic density. On the premise of ensuring the magnetic density, the reliability of the overall structure can be significantly improved. In one embodiment, the angle A2 corresponding to the width of the rib is 0.2 to 0.6 with the axis of the rotor body 1 as the center. Within this range, the envelope 4 can play a tight connection role while having little effect on the overall magnetic density. On the premise of ensuring the magnetic density, the reliability of the overall structure can be significantly improved. In one embodiment, the thickness T of the envelope 4 is 0.2mm to 4mm. If the thickness of the envelope 4 is too thin, the strength of the envelope 4 is not enough, and if the thickness of the envelope 4 is too thick, it will affect the density of the overall 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 overall magnetic field. 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 have certain strength while not greatly affecting the overall magnetic density, so that the motor rotor can maintain a better state. In one embodiment, four envelopes 4 are provided, which 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. In this embodiment, the magnetic tile 2 is fixedly arranged on the surface of the rotor body 1 through the fixing groove 31, so that the fixing groove 31 can well limit the magnetic tile 2 in a high-speed state, and the magnetic tile 2 can still be very stably fixed on the periphery of the rotor body 1 at high speed. However, under normal operation of the motor, due to the stability of the machining precision, a gap is easily left between the magnetic tile 2 and the fixing groove 31, so that the magnetic tile 2 will vibrate with the operation of the motor. Long-term vibration makes the magnetic tile 2 and the fixing groove 31 prone to looseness, and then after a certain period of high-speed operation, the magnetic tile 2 will collapse from the fixing groove 31, causing the motor to malfunction. The envelope body 4 in the application is arranged on the outer surface of the rib 3, and the two sides of the envelope body 4 are connected with the magnetic tile 2. After the magnetic tile 2 is installed on the periphery of the rotor body 1, a layer of envelope body 4 is arranged on the periphery of the rib 3 by injection molding, so that the envelope 4 tightly encapsulates the rotor body and the magnetic tile into an integrated whole, thereby avoiding the vibration of the magnetic tile 2 during the operation of the motor, and improving the overall service life. And in the process of high-speed operation of the motor rotor, the limiting of the magnetic tile 2 is mainly completed by the fixing groove 31, that is, in the high-speed operation state of the rotor, the centrifugal force borne by the rib 3 is very large, and the arrangement of the envelope body 4 can share the centrifugal force borne by the rib 3, further stabilizing the magnetic tile 2 and improving the overall reliability of the motor rotor. The outer surface of the envelope body 4 cooperates with the outer surface of the magnetic tile 2 to form a cylindrical surface. When the motor rotor cooperates with the motor stator, the air gap formed between the envelope body 4, the magnetic tile 2 and the motor stator is very small, and the influence on the magnetic density is very small. It should be noted that the envelope body 4 formed by the injection molding method using the injection molding material can also be formed by filling the single-component or multi-component liquid-solid glue. In the prior art, a magnetic shield ring is designed to increase the reliability of the magnetic tile 2 during high-speed operation, which increases the air gap between the stator and the rotor, reduces the magnetic density, and reduces the efficiency and other performance of the motor. The size of the air gap and the reliability of the motor rotor cannot be achieved; in the embodiment, the problem of the size of the air gap and the stability of the motor rotor in the prior art is perfectly solved, which has the characteristics of simple process and stable reliability, and can be applied to high-speed operation environment, especially for high-speed motor. In one embodiment, in order to further improve the stability of the envelope body 4 fixedly arranged on the outer side of the rotor body 1, at least one end of the envelope body 4 is connected with the envelope ring 41. When one end of the envelope body 4 is provided with the envelope ring 41, the other end can be provided with an encapsulation disc or other structure to encapsulate the rotor body 1. In the embodiment, the two ends of the plurality of envelope bodies 4 are connected with the envelope ring 41, and the envelope body 4 and the envelope ring 41 form a complete plastic encapsulation shell by injection molding, and the envelope ring 41 abuts against the two ends of the rotor body 1, further improving the resistance of the envelope body 4 to the magnetic tile 2 and the rib 3, and further improving the reliability of the overall operation of the motor rotor. And since the envelope ring 41 is arranged at the two ends of the rotor body 1, the envelope ring 41 covers the end face of the rotor body 1, and the magnetic tile 2 is axially fixed at the two ends of the rotor body 1, which makes the magnetic tile 2 completely wrapped and limited by the fixing groove 31 and the envelope ring 41, further improving the stability of the magnetic tile 2 fixed on the outer side of the rotor body 1. In one embodiment, the width of the rib 3 gradually increases away from the rotor body 1, so that the cross section of the rib 3 forms a "swallowtail" shape. The two side walls of the rib 3 are inclined, and the side walls on both sides of the rib 3 cooperate with the circumferential surface of the rotor body 1 to form a fixing groove 31, which limits the magnetic tile 2. The included angle of the side walls on both sides of the rib 3 is B, which is between 90° and 125°. In this embodiment, the magnetic tile 2 is fixed on the surface of the rotor body 1 through the fixing groove 31, so that the fixing groove 31 can well limit the magnetic tile 2 under high speed conditions, so that the magnetic tile 2 can still be very stably fixed on the periphery of the rotor body 1 under high speed. The outer surface of the rib 3 is locked by the envelope 4, which fills the gap between the magnetic tile 2 and the rib 3, and the envelope 4 can share the centrifugal force received by the rib 3, further limiting the magnetic tile 2 and improving the reliability of the motor rotor as a whole. And the envelope 4 cooperates with the outer surface of the magnetic tile 2 to form a cylindrical surface, when the motor rotor cooperates with the motor stator, the air gap formed by the envelope 4, the magnetic tile 2 and the motor stator is very small, which has little effect on the magnetic density. The envelope 4 and the envelope ring 41 form a complete plastic shell, and the envelope ring 41 is arranged at both ends of the rotor body 1, which further improves the resistance of the envelope 4 to the magnetic tile 2 and the rib 3, and further improves the reliability of the motor rotor as a whole. And because the envelope ring 41 is arranged at both ends of the rotor body 1, and the envelope ring 41 covers the end surface of the rotor body 1, the magnetic tile 2 is axially fixed at both ends of the rotor body 1, which makes the magnetic tile 2 be completely wrapped and limited by the fixing groove 31 and the envelope ring 41, further improving the stability of the magnetic tile 2 fixed on the outside of the rotor body 1. In the prior art, a magnetic shield ring is designed to increase the reliability of the magnetic tile 2, which increases the air gap between the stator and the rotor, reduces the magnetic density, and reduces the efficiency and other performance of the motor, resulting in the problem that the size of the air gap and the stability of the motor rotor cannot be compatible. The application perfectly solves the problem of the size of the air gap and the stability of the motor rotor in the prior art, has the characteristics of simple process and stable reliability, and can be applied to high-speed operating environment. The application can save 15-30% of materials compared with conventional motor structure under the same power, speed and torque conditions, and the type of motor has wide application range and large use amount, which can significantly reduce carbon emissions. Embodiment 2: The difference between this embodiment and embodiment 1 is that, in order to further improve the stability between the rib 3 and the envelope body 4, a plurality of end anchor pieces 401 are arranged at positions corresponding to the outer surface of the rib 3 of the envelope body 4, and the end anchor pieces 401 are embedded in the rib 3. By connecting between the end anchor pieces 401 and the rib 3, the strength of the connection between the envelope body 4 and the rib 3 is further improved, so that it can better adapt to the operation of high-speed motor. A plurality of connecting grooves 32 are arranged on the outer surface of the rib 3 along the width direction thereof, and the connecting grooves 32 are arranged along the length direction of the rib 3, and the end anchor pieces 401 are closely arranged in the connecting grooves 32. As shown in FIG. 3, two connecting grooves 32 are arranged in this embodiment, and the end anchor pieces 401, like the envelope body 4 and the envelope ring 41, are formed in one injection molding process. The end anchor pieces 401 are formed by injecting injection molding material into the connecting grooves 32, that is, the envelope body 4, the envelope ring 41 and the end anchor pieces 401 are integrally formed. By cooperating between the end anchor pieces 401 and the connecting grooves 32, the contact area between the envelope body 4 and the rib 3 can be increased, thereby improving the connection strength therebetween, and playing a more stable limiting role for the magnetic tile 2. In one embodiment, the width of the connecting groove 32 gradually decreases away from the rotor body 1, so that the cross section of the connecting groove 32 forms an open and narrow dovetail groove. Correspondingly, the width of the end anchor piece 401 gradually increases away from the envelope body, so as to limit the end anchor piece 401 and effectively prevent the connecting piece from being separated from the rib 3, thereby improving the connection strength between the end anchor piece 401 and the connecting groove 32. Of course, the cross section of the end anchor piece 401 can also be arranged in other shapes, including but not limited to a zigzag shape or other special-shaped structure which increases the contact area between the envelope body 4 and the rib 3. Embodiment 3: As shown in FIG. 2 or FIG. 3, the structure of this embodiment is similar to that of embodiment 1 or embodiment 2, and the difference is that the two sides of the magnetic tile 2 in the width direction are side surfaces 22, the inner and outer sides of the magnetic tile 2 are inner side surfaces 24 and outer side surfaces 23 respectively, and the outer side surface 23 of the magnetic tile 2 is connected to the side surface 22 through an open angle area 27. The open angle area 27 is a circular arc surface with a gradually decreasing radius and taking the axis of the rotor body 1 as the center. Side pages 42 are arranged on both sides of the envelope body 4 in the width direction, the side pages 42 are adapted to the open angle area 27, and the thickness of the side pages 42 gradually decreases away from the envelope body 4. In one embodiment, the corresponding angle of the open angle area 42 is C, and the size of C is between 10° and 20°. Through the connection between the side page 42 and the opening angle area 27, the contact area between the envelope body 4 and the magnetic tile 2 can be increased, thereby improving the connection strength between the envelope body 4 and the rib 3. Without affecting the overall magnetic density, the reliability of the envelope body 4 is further improved. In this embodiment, as shown in FIGS. 3 to 9, the structure is similar to that in any one of embodiments 1 to 4, except that a plurality of reinforcing grooves 11 are arranged on the outer side wall of the rotor body 1. When the envelope body 4 is formed by injection molding, the reinforcing grooves 11 are simultaneously formed by injection molding to form reinforcing strips, thereby further improving the stability of the connection between the magnetic tile 2 and the rotor body 1. The cross section of the reinforcing groove 11 can be "dovetail-shaped" or other shapes, including but not limited to zigzag or other special-shaped structures that increase the contact area between the reinforcing strip and the reinforcing groove 11. In one embodiment, as shown in FIG. 3, the side of the envelope body 4 close to the rib 3 is provided with two side anchors 402, which are located on both sides of the rib 3. Specifically, as shown in FIG. 3, the side edge surface 22 of the magnetic tile 2 is in close contact with the fixed groove 31, and a chamfer structure is arranged on both sides of the magnetic tile 2. The two chamfer structures are also provided with chamfer structures on both sides in the width direction of the rib 3, and a filling gap 4021 is formed between the two chamfer structures. The side anchor 402 is filled in the filling gap 4021. In one embodiment, as shown in FIG. 5, a shrinkage groove 25 is arranged between the side edge surface 22 and the outer side surface 23. The shrinkage groove 25 cooperates with the rib 3 to form a gap, which is the second gap 13. The shrinkage groove 25 includes a first side surface 251 and a second side surface 252 connected to each other, and 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 edge surface 22, and the second side surface 252 is connected to the outer side surface 23. The side anchor 402 extends into the gap to form a clamping, and the two clamps on the envelope body 4 are symmetrically clamped on both sides of the rib 3, thereby improving the connection strength between the envelope body 4 and the magnetic tile 2. After the side anchor 402 is filled in the second gap 13, it plays a limiting role for the magnetic tile 2, thereby improving the stability of the magnetic tile 2 installed on the outside of the rotor body 1, so that the motor can adapt to higher speed. The second gap 13 in this embodiment does not penetrate through the entire fixed groove 31, but only forms a side anchor 402 in a local part, which can also play a role in clamping the rib. It should be noted that the second gap 13 can be filled with the same material as the envelope body 4 to form a whole; the second gap 13 can also be filled with single-component or multi-component liquid-solid glue. The use of liquid-solid glue has the following advantages: first, it can play a bonding role, so that the magnetic tile 2 and the rib 3 can be firmly bonded together. The liquid-solid glue can be filled in 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, thereby improving the service life of the motor as a whole. In one embodiment, as shown in FIG. 6, a gap is provided between the side surface 22 and the fixed groove 31, which is the first gap 12, and the side anchor 402 extends into the first gap 12 to form a tie 4023 that cooperates with the first gap 12. The tie 4023 separates the magnetic tile 2 from the rib 3. The tie 4023 is arranged on both sides of the rib 3, increasing the connection area between the tie 4023 and the magnetic tile 2 and the rib 3, so that the envelope 4 can be more stably arranged on the outer surface of the rib 3, thereby better limiting the magnetic tile 2. And because the cross section of the rib 3 is in the shape of a dovetail, when the tie 4023 is arranged along the rib 3, the tie 4023 not only adheres to the side wall of the rib 3, but also forms a clamping opening on both sides of the rib 3, further improving the connection strength between the envelope 4 and the rib 3, thereby further improving the reliability of the motor stator as a whole. It should be noted that the first gap 12 can be filled with the same material as the envelope 4 to form the tie 4023, forming a whole with the envelope 4; the first gap 12 can also be filled with a single-component or multi-component liquid-solid adhesive. Using a liquid-solid adhesive has the following advantages: first, it can play a bonding role, so that the magnetic tile 2 and the rib 3 can be firmly bonded together. The liquid-solid adhesive can be filled in the first gap 12 to form the tie 4023, so that the gap between the magnetic tile 2 and the rib is completely filled, the magnetic tile 2 is firmly locked between the two ribs 3, effectively preventing the magnetic tile 2 from vibrating, and improving the service life of the motor as a whole.

[0090] In one embodiment, as shown in FIG. 6, an auxiliary anchor groove 111 is arranged on the outer side wall of the rotor body 1 near the fixed groove 31, the first gap 12 communicates with the auxiliary anchor groove 111, the tie belt 4023 extends towards the auxiliary anchor groove 11, and the auxiliary anchor groove 11 closely cooperates with the auxiliary anchor groove 111 to form an auxiliary anchor strip 4022. During injection molding, the injection material fills in the first gap 12 and the auxiliary anchor groove 111, forms the auxiliary anchor strip 4022 at the end of the tie belt 4023, and the auxiliary anchor strip 4022 cooperates with the auxiliary anchor groove 111, thereby further improving the reliability between the magnet shoe 2 and the rotor body 1. In this embodiment, the auxiliary anchor strip 4022, the side anchor 402, and the envelope body 4 are formed by one-piece injection molding, so that the overall strength is very firm, and the auxiliary anchor strip 4022 cooperates with the auxiliary anchor groove 111 to form a first clamping structure, the tie belt 4023 cooperates with the first gap 12 to form a second clamping structure, and the first clamping structure and the second clamping structure make the envelope body 4 more closely connected between the rib 3 and the magnet shoe 2, thereby improving the overall strength and making the application applicable to 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 body 4 to form a whole; the first gap 12 and the auxiliary anchor groove 111 can also be filled with single-component or multi-component liquid-solid glue, which has the following advantages: first, it can play a bonding role, so that the magnet shoe 2 and the rib 3 can be firmly bonded together, the liquid-solid glue can fill in the first gap 12 and the auxiliary anchor groove 111, so that the gap between the magnet shoe 2 and the rib is completely filled, the magnet shoe 2 is firmly locked between the two ribs 3, effectively preventing the magnet shoe 2 from vibrating, and improving the overall service life of the motor. In one embodiment, the width of the auxiliary anchor groove 111 gradually increases away from the envelope body 4, which can further improve the tightness of the connection between the auxiliary anchor strip 4022 and the auxiliary anchor groove 111. In one embodiment, as shown in FIGS. 7 and 8, a transition surface 26 is arranged between the outer side surface 23 and the inner side surface 24, the transition surface 26 is in the shape of a circular arc, and when the magnet shoe 2 cooperates with the fixed groove 31, the outer side surface 23 abuts against the side wall of the fixed groove 31. The opening direction of the circular arc transition surface 26 can be towards the rib 3 or away from the rib 3. A third gap 14 is formed between the transition surface 26 and the fixed groove 31; after the injection material fills in the third gap 14, it plays a limiting role for the magnet shoe 2, improves the stability of the magnet shoe 2 installed on the outside of the rotor body 1, and can adapt to higher speed. Embodiment 5: as shown in FIG. 9, the structure in this embodiment is similar to that in embodiment 5, except that a side groove 311 is further arranged 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. The side groove 311 can increase the gap between the side surface 22 and the fixing groove 31, so that the injection molding material can be filled in the side groove 311, and the strength of the injection molding material is increased. The distance between the side wall of the rib 3 and the outer wall of the rib 3 is L, and the arrangement of the side groove 311 can shorten the length of L, so that the toughness of the rib 3 is improved without reducing the strength of the rib 3, so that the rib 3 can be more suitable for the condition of rapid acceleration of the motor rotor. In the embodiment 6 shown in FIG. 4, the structure is similar to that in the embodiment 1 or the embodiment 2 or the embodiment 3 or the embodiment 4 or the embodiment 5, and the difference is that the step surface 21 is arranged at both ends of the rotor body 1 along the axis of the rotor body 1. The step surface 21 in the embodiment is a two-layer step surface 21, and of course, the step surface 21 can be arranged as a step surface 21 with any number of layers. The envelope ring 41 is matched with the step surface 21. The envelope ring 41 cooperates with the step surface 21 at the end of the magnet shoe 2, which not only can limit the magnet shoe 2 in the axial direction (in the direction parallel to the axis of the rotor body 1), but also can limit the magnet shoe 2 in the radial direction (in the direction perpendicular to the axis of the rotor body 1). Through the limitation of the envelope ring 41 to the magnet shoe 2 in the radial direction, the centrifugal force borne by the rib 3 and the envelope body 4 is reduced, and the reliability of the motor rotor in the high-speed running state is improved. In the embodiment 7 shown in FIG. 7, a high-speed motor includes the motor rotor structure, and further includes a rotating shaft 5 penetrating the axis of the rotor body 1, and a fan blade 51 arranged at one end of the rotating shaft 5. When the rotating shaft 5 rotates, the fan blade 51 rotates, and the wind generated by the fan blade 51 cools the motor. Further, a stator body 6 is arranged outside the motor rotor structure, and the stator body 6 closely cooperates 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. The stator body 6 is composed of a plurality of stator discs, and a coil 62 is arranged on the stator body 6. The stator body 6 is provided with a plurality of positioning grooves 61 arranged in the circumferential direction and penetrating the stator body 6, and the positioning grooves 61 are arranged along the axis of the stator body 6. The stator body 6 is provided with a wire rack 7 at both ends, and the wire rack 7 is provided with a positioning block 71 matched with the end of the positioning groove 61. The front cover 8 and the rear cover 9 are arranged at the side away from the stator body 6 of the wire rack 7 at both ends. Through the above assembly mode, a motor with high magnetic density and high efficiency can be formed, which can be applied to high-speed motors. The above-described embodiments are only the preferred schemes of the present application, and do not limit the present application in any form. Other variations and modifications can be made without departing from the technical scheme recited in the claims.

Claims

1. An electric machine rotor structure, characterized in that, The rotor body is provided with a plurality of ribs in the circumferential direction of the rotor body, and the ribs are arranged along the axial direction of the rotor body; both sides of the rib in the width direction are provided with a fixed groove; The magnetic tile is arranged between adjacent ribs, and both sides of the magnetic tile in the width direction are matched with the fixed groove, and the outer surface of the rib is lower than the outer surface of the magnetic tile; The outer surface of the plurality of ribs is correspondingly provided with an envelope body, both sides of the envelope body extend outward and are connected with the magnetic tile, and the outer surface of the envelope body and the outer surface of the magnetic tile form a concentric circle. At least one end of the plurality of envelope bodies is provided with an envelope ring, and the envelope ring is integrally formed with the envelope body.

2. The electric machine rotor structure of claim 1, wherein, Taking the axis of the rotor body as the center, the corresponding angle of the envelope body is A1, and the size of A1 is between 25° and 50°.

3. The motor rotor structure of claim 1, wherein Taking the axis of the rotor body as the center, the corresponding angle of the width of the rib is A2, and A2 / A1 is between 0.2 and 0.

6.

4. The electric machine rotor structure of claim 3, wherein, The thickness of the envelope body is T, and T is not greater than 4mm.

5. The motor rotor structure of claim 1 wherein, At the position corresponding to the outer surface of the rib, a plurality of end anchor elements are arranged, and the end anchor elements are embedded in the rib.

6. The electric machine rotor structure of any one of claims 1 to 5, characterized by The end anchor element is an end anchor strip arranged along the length direction of the rib, and the width of the end anchor strip gradually increases away from the envelope body.

7. The electric machine rotor structure of claim 6, wherein, Both sides of the magnetic tile in the width direction are side surfaces, the outer side surface of the magnetic tile and the side surface of the magnetic tile are connected through an opening angle area, the opening angle area is a circular arc surface with gradually decreasing radius; side pages are arranged on both sides of the envelope body in the width direction, and the side pages are matched with the opening angle area.

8. The electric machine rotor structure of any one of claims 1 to 8, characterized by Taking the axis of the rotor body as the center, the corresponding angle of the opening angle area is C, and the size of C is between 10° and 20°.

9. The electric machine rotor structure of claim 8, wherein, The side close to the rib of the envelope body is provided with two side anchor elements, and the two side anchor elements are located on both sides of the rib.

10. The electric machine rotor structure of any one of claims 1 to 5, characterized by Both sides of the magnetic tile in the width direction are side surfaces, the side surfaces are in close contact with the fixed grooves, the edges of the side surfaces and the edges of the fixed grooves are provided with chamfer structures, and the side anchor elements are filled between the chamfer structures of the side surfaces and the fixed grooves.

11. The electric machine rotor structure of claim 10, wherein, A transition groove is arranged between the outer side surface of the magnetic tile and the side surface, the rib and the transition groove cooperate to form a gap, the side anchor element extends into the gap to form a clamping, and the clamping is in close cooperation with the gap.

12. The electric machine rotor structure of claim 11, wherein, A gap is arranged between the magnetic tile and the fixed groove, and the side anchor element is a lacing strip matched with the gap.

13. The electric machine rotor structure of claim 10 wherein, An auxiliary anchor groove is arranged on the outer side wall of the rotor body and close to the fixed groove, and an end portion of the lacing strip is provided with an auxiliary anchor strip matched with the auxiliary anchor groove.

14. The electric machine rotor structure of claim 12, wherein, The width of the auxiliary anchor groove gradually increases away from the envelope body.

15. The electric machine rotor structure of claim 14, wherein, The thickness of the envelope body is 5% to 20% of the thickness of the magnetic tile.

16. The electric machine rotor structure of any one of claims 1 to 5, characterized by The envelope body tightly packages the rotor body and the magnetic tile into one body.

17. The electric machine rotor structure of any one of claims 1 to 5, characterized by The magnetic tile is provided with a stepped surface at both ends along the axial direction of the rotor body, and the plastic ring is matched with the stepped surface.

18. The electric machine rotor structure of claims 1 to 5, characterized by, The envelope body is provided with four envelope bodies, and the four envelope bodies are uniformly distributed in the circumferential direction of the rotor body.

19. The electric machine rotor structure of claims 1 to 5, characterized by, The width of the rib gradually increases away from the rotor body.

20. The electric machine rotor structure of any one of claims 1 to 5, characterized by The motor rotor structure of any one of claims 1 to 20 is further provided with a stator body sleeved outside the motor rotor structure, and the stator body is closely matched with the motor rotor structure.

21. A high speed electric motor characterized by, ​

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