A motor rotor and a motor

Abstract

The present disclosure provides a motor rotor and a motor. The motor rotor includes a rotor outer iron core and a rotor inner iron core. There are multiple rotor outer iron cores, and the multiple rotor outer iron cores are arranged in a circumferential direction and are all disposed radially outside the rotor inner iron core. A first protruding portion is provided on the outer circumference of the rotor inner iron core protruding radially outward, and the first protruding portion faces the rotor outer iron core. And there is at least one second protruding portion provided on the radially inner circumference of the rotor outer iron core, and the second protruding portion can cooperate with the first protruding portion to perform circumferential positioning and / or axial positioning between the rotor outer iron core and the rotor inner iron core. According to the present disclosure, it can not only prevent the inner rotor iron core from falling off in the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores, enhance the structural strength of the rotor, and prevent the situation where the structural strength of the rotor is reduced due to the setting of the damping structure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of motors, and particularly to a motor rotor and a motor. Background Art

[0002] In order to reduce the motor vibration caused by torque ripple during load of a permanent magnet synchronous motor, thereby improving the noise quality of the motor. Usually, a damping rubber is added between the inner and outer rotor cores to reduce the load vibration and thus optimize the motor noise. However, most of the traditional damping rotor structures are applied to the surface-mounted magnetic tile structure. When implementing the damping rotor design, there is sufficient space inside the rotor; for an interior permanent magnet motor, especially a motor with a tangential structure of embedded magnetic tiles, due to limited space, it is usually necessary to sacrifice the motor performance to manufacture a damping rotor. Moreover, the structural strength of the rotor is attenuated, and the motor power density cannot be guaranteed, resulting in a decrease in motor power, a decrease in structural strength, material waste, and an increase in cost; at the same time, there is no good connection between the magnetic tiles and the iron core of the traditional interior permanent magnet motor, and the magnetic tiles are extremely likely to fall off during high-speed operation, leading to abnormal motor performance.

[0003] Due to the technical problems in the prior art that the processing of rotor vibration damping for an interior permanent magnet motor will lead to a decrease in the structural strength of the rotor and the motor power density cannot be guaranteed, etc., the present disclosure researches and designs a motor rotor and a motor.

[0004] Disclosure

[0005] Therefore, the technical problem to be solved by the present disclosure is to overcome the defect that the structural strength is reduced due to the vibration damping setting of the motor rotor in the prior art, so as to provide a motor rotor and a motor.

[0006] To solve the above problems, the present disclosure provides a motor rotor, which includes:

[0007] An outer rotor iron core and an inner rotor iron core, there are a plurality of the outer rotor iron cores, and the plurality of outer rotor iron cores are arranged in a circumferential direction and are all arranged on the radial outer side of the inner rotor iron core. A first protruding portion is convexly provided on the outer circumference of the inner rotor iron core in the radial outer direction, and the first protruding portion faces the outer rotor iron core. And at least one of the radial inner circumferences of the outer rotor iron cores is provided with a second protruding portion, and the second protruding portion can cooperate with the first protruding portion to perform circumferential positioning and / or axial positioning between the outer rotor iron core and the inner rotor iron core.

[0008] In some embodiments, a third protrusion is further provided on the first protrusion of the inner iron core of the rotor. The third protrusion protrudes towards the outer iron core of the rotor and is opposite to the second protrusion. A groove is provided on the second protrusion, and the third protrusion can be inserted into the groove to form positioning.

[0009] In some embodiments, the outer iron cores of the rotor with the second protrusions and the outer iron cores of the rotor without the second protrusions are arranged alternately in the circumferential direction. The first protrusions with the third protrusions and the first protrusions without the third protrusions are arranged alternately in the circumferential direction of the inner iron core of the rotor. The outer iron core of the rotor with the second protrusion is opposite to the first protrusion with the third protrusion. The outer iron core of the rotor without the second protrusion is opposite to the first protrusion without the third protrusion. The radially inner end of the outer iron core of the rotor without the second protrusion is not connected to the first protrusion.

[0010] In some embodiments, the length of the groove in the axial direction of the outer iron core of the rotor ≥ the length of the third protrusion in the axial direction.

[0011] In some embodiments, the length of the groove in the axial direction of the outer iron core of the rotor is less than the length of the second protrusion in the axial direction, and the length of the third protrusion in the axial direction of the inner iron core of the rotor is less than the length of the first protrusion.

[0012] In some embodiments, the minimum axial distance between the groove and one axial end face of the second protrusion is greater than 0, and the minimum axial distance between the groove and the other axial end face of the second protrusion is also greater than 0; the minimum axial distance between the third protrusion and one axial end face of the first protrusion is greater than 0, and the minimum axial distance between the third protrusion and the other axial end face of the first protrusion is also greater than 0.

[0013] In some embodiments, a first axial positioning hole is provided on one axial end face of the second protrusion. The first axial positioning hole extends to communicate with the groove. A second axial positioning hole is provided on the axial end face of the third protrusion opposite to the first axial positioning hole. The motor rotor further includes a positioning member, and the positioning member can be inserted from the first axial positioning hole into the groove and further into the second axial positioning hole.

[0014] In some embodiments, the first protrusion on the inner iron core of the rotor is opposite to the second protrusion on the outer iron core of the rotor and is spaced apart by a first preset distance;

[0015] The first protrusion on the inner iron core of the rotor is opposite to the radial inner end of the outer iron core of the rotor where the second protrusion is not provided and is spaced apart by a second preset distance;

[0016] The second preset distance > the first preset distance > 0.

[0017] In some embodiments, two adjacent outer iron cores of the rotor are spaced apart by a third preset distance along the circumferential direction, and the third preset distance > 0.

[0018] In some embodiments, it further includes a magnet, and the magnet includes an insertion part and a limiting part. The insertion part is connected to the limiting part, and the insertion part can be inserted into the gap between two adjacent outer iron cores of the rotor, and the limiting part can be clamped on the axial end face of two adjacent outer iron cores of the rotor.

[0019] In some embodiments, the axial length of the magnet > the axial length of the outer iron core of the rotor, the axial length of the insertion part ≥ the axial length of the outer iron core of the rotor, and the width of the limiting part along the circumferential direction > the third preset distance.

[0020] In some embodiments, there are multiple magnets, which are distributed at intervals along the circumferential direction, and one magnet is arranged between two adjacent outer iron cores of the rotor; and / or, the magnet is in the structure of a magnetic tile.

[0021] In some embodiments, it further includes a potting compound, and the potting compound is filled in at least one of the gaps between the magnet and the outer iron core of the rotor, on the axial end face of the magnet, and on the axial end face of the outer iron core of the rotor.

[0022] In some embodiments, after the potting compound is filled on the axial end face of the magnet and on the axial end face of the outer iron core of the rotor, a circular ring structure is formed.

[0023] In some embodiments, it further includes a damping material, and the damping material is filled in at least one of the gaps between the inner iron core of the rotor and the outer iron core of the rotor, the gaps between the potting compound and the magnet, on the axial end face of the inner iron core of the rotor, and on the axial end face of the outer iron core of the rotor.

[0024] In some embodiments, after the damping material is filled in the gaps between the inner iron core of the rotor and the outer iron core of the rotor, on the axial end face of the inner iron core of the rotor, and on the axial end face of the outer iron core of the rotor, a circular ring structure is formed; and / or, the damping material is damping rubber.

[0025] In some embodiments, a magnetization positioning hole is provided on the outer rotor iron core, and the magnetization positioning hole is an axial through hole penetrating from one axial end face of the outer rotor iron core to the other axial end face; and / or, a mold positioning hole is provided on the outer rotor iron core, and the mold positioning hole is an axial through hole penetrating from one axial end face of the outer rotor iron core to the other axial end face.

[0026] The present disclosure also provides a motor, which includes the motor rotor described in any one of the preceding items.

[0027] The motor rotor and the motor provided by the present disclosure have the following beneficial effects:

[0028] 1. In the present disclosure, by providing the second protrusions on at least one outer rotor iron core and making the second protrusions arranged opposite to the first protrusions on the inner rotor iron core, circumferential and / or axial limits can be generated between the first protrusions and the second protrusions, so as to effectively achieve circumferential limit and / or axial limit between the outer rotor iron core and the inner rotor iron core. It can not only prevent the inner rotor iron core from falling off along the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores, enhance the structural strength of the rotor, and prevent the reduction of the rotor structural strength caused by setting the damping structure; further, in the present disclosure, the third protrusions further radially protruding on the first protrusions and the groove structures provided on the second protrusions form a concave-convex fit, and the third protrusions can be inserted into the groove structures, so as to effectively position between the outer rotor iron core and the inner rotor iron core, further effectively improve the structural strength of the rotor, form tangential limit and axial positioning, which can not only prevent the inner rotor iron core from falling off along the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores;

[0029] 2. In the present disclosure, by making the radial inner end of the outer rotor iron core without the second protrusions opposite to the first protrusions of the inner rotor iron core without the third protrusions and forming a gap therebetween, a magnetic isolation groove can be effectively formed at this position, thereby effectively improving the motor power density, so as to form a connection method of intermittent connection that seems to be connected but not connected in the inner circular magnetic isolation bridge of the outer rotor iron core, which can not only enhance the rotor structure strength, but also improve the motor power density;

[0030] 3. In the present disclosure, by providing the first axial positioning holes on the second protrusions, the second axial positioning holes on the third protrusions, and the form that the groove is communicated with the first axial positioning holes, when the third protrusions are inserted into the grooves, the positioning parts can be inserted into the first axial positioning holes and then inserted into the second axial positioning holes, so as to effectively position and fix between the inner rotor iron core and the outer rotor iron core, and further improve the structural strength of the rotor;

[0031] 4. The present disclosure also forms circumferential limitation of the magnet by setting the magnet to include an insertion portion and a limiting portion. The insertion portion is inserted into the gap between two adjacent outer rotor iron cores to form circumferential limitation of the magnet. The width of the limiting portion is greater than the width of the gap (the third preset distance), which can form effective axial positioning of the magnet, thereby enhancing the positioning and fixing effect of the magnet and preventing it from falling off.

[0032] 5. The present disclosure can also effectively position magnetization and effectively position die processing by providing magnetization positioning holes and die positioning holes on the outer rotor iron core. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is the assembly structure diagram of the outer rotor iron core of the present disclosure;

[0034] Figure 2a is Figure 1 the structure diagram of the outer rotor iron core with a second protruding portion in

[0035] Figure 2b is Figure 1 the structure diagram of the outer rotor iron core without a second protruding portion in

[0036] Figure 3 is the assembly structure diagram of the inner rotor iron core of the present disclosure;

[0037] Figure 4 is the assembly structure diagram of the outer rotor iron core and the inner rotor iron core of the present disclosure;

[0038] Figure 4a is Figure 4 the partial enlarged view of part A in

[0039] Figure 5 is the structure diagram of the magnetic tile in the motor rotor of the present disclosure;

[0040] Figure 6 is the completed assembly diagram of the magnetic tile and the iron core of the present disclosure;

[0041] Figure 7 is the injection molding diagram of the potting compound, the outer rotor iron core, and the magnetic tile of the present disclosure;

[0042] Figure 8 is the general assembly diagram of the damping rotor of the present disclosure;

[0043] Figure 9 is Figure 8 the internal cross-sectional view of

[0044] The reference signs are shown as:

[0045] 1. Rotor outer iron core; 11. Second protruding part; 12. Groove; 13. First axial positioning hole; 14. Magnetizing positioning hole; 15. Die positioning hole; 2. Rotor inner iron core; 21. First protruding part; 22. Third protruding part; 23. Second axial positioning hole; 3. Positioning part; 4. Magnet; 41. Insertion part; 42. Limiting part; 5. Plastic encapsulation material; 6. Vibration damping material. Detailed implementation mode

[0046] As Figures 1 - 9 shown, the present disclosure provides a motor rotor, which includes:

[0047] A rotor outer iron core 1 and a rotor inner iron core 2, there are a plurality of the rotor outer iron cores 1, the plurality of rotor outer iron cores 1 are arranged in a circumferential direction and are all arranged on the radial outer side of the rotor inner iron core 2, a first protruding part 21 is protrudingly arranged on the outer circumference of the rotor inner iron core 2 in the direction of the radial outer side, and the first protruding part 21 faces the rotor outer iron core 1, and there is at least one second protruding part 11 arranged on the radial inner circumference of the rotor outer iron core 1, and the second protruding part 11 can cooperate with the first protruding part 21 to perform circumferential positioning and / or axial positioning between the rotor outer iron core 1 and the rotor inner iron core 2. The present disclosure, by providing a second protruding part on at least one rotor outer iron core and making the second protruding part face the first protruding part on the rotor inner iron core, enables circumferential and / or axial limiting to be generated between the first protruding part and the second protruding part, thereby effectively achieving circumferential limiting and / or axial limiting between the rotor outer iron core and the rotor inner iron core, which can not only prevent the inner rotor iron core from falling off along the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores, enhance the structural strength of the rotor, and prevent the situation that the structural strength of the rotor is reduced due to the setting of the vibration damping structure.

[0048] The present disclosure provides a shock-absorbing rotor, which can not only ensure that the performance of the motor does not decline, but also achieve a good shock-absorbing effect, and at the same time can well fix the magnetic tile, prevent the magnetic tile from falling off, improve the process feasibility, reduce the production difficulty, and improve the noise quality of the motor. 1. Adopt the connection method that all the outer circular magnetic isolation bridges are disconnected and the inner circular magnetic isolation bridges are intermittently connected in a seemingly connected but actually disconnected manner, which can not only enhance the structural strength of the rotor, but also improve the power density of the motor; 2. Increase the tangential limit (the positioning of the boss of the inner rotor iron core and the groove of the outer rotor iron core, that is, circumferential positioning) to prevent the inner rotor iron core from falling off along the circumferential direction; 3. Increase the axial positioning holes to strengthen the structural strength between the inner and outer rotor iron cores; 4. One end of the magnetic tile is higher than the outer rotor iron core and can be fixed on the outer rotor iron core to prevent the magnetic tile from falling off; 5. Solve the motor noise and improve the user's sound quality experience; 6. Axial through holes are opened on the outer rotor iron core for magnetizing positioning and strengthening the structural strength.

[0049] In some embodiments, a third protruding portion 22 is further provided on the first protruding portion 21 of the inner iron core 2 of the rotor. The third protruding portion 22 protrudes toward the outer iron core 1 of the rotor and is opposite to the second protruding portion 11. A groove 12 is provided on the second protruding portion 11, and the third protruding portion 22 can be inserted into the groove 12 to form positioning. The present disclosure also forms a concave-convex fit through the third protruding portion further radially protruding on the first protruding portion and the groove structure provided on the second protruding portion. The third protruding portion can be inserted into the groove structure, thereby forming effective positioning between the outer iron core and the inner iron core of the rotor, further effectively improving the structural strength of the rotor, forming tangential limit and axial positioning, which can not only prevent the inner rotor iron core from falling off along the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores.

[0050] Disconnecting the magnetic isolation bridge (i.e., the part connecting the outer iron core and the inner iron core of the rotor) can greatly reduce the magnetic leakage of the rotor, improve the power density and performance of the motor. However, the structural strength of the completely disconnected structure is relatively poor, and the iron core is prone to deformation during stamping, and the processability is also poor; combining the two can take into account both structural strength and motor performance.

[0051] The present disclosure provides a novel embedded shock-absorbing rotor structure. The outer circular magnetic isolation bridge is completely disconnected, and the inner circular magnetic isolation bridge is connected in an intermittent manner (i.e., the inner circular magnetic isolation bridge seems to be intermittently connected, but actually is also disconnected), which can not only enhance the rotor structure strength, but also improve the power density of the motor; adopting tangential limit and axial positioning can not only prevent the inner rotor iron core from falling off along the circumferential direction, but also strengthen the structural strength between the inner and outer rotor iron cores. At the same time, the magnetic tile is fixed on the outer rotor iron core to prevent the magnetic tile from falling off.

[0052] Outer iron core of the rotor: a. The iron core adopts two structures of long and short, and the outer circular magnetic isolation bridge is completely disconnected; b. The inner circular tooth part of the long iron core is provided with a rectangular card slot and an axial positioning hole for placing the inner iron core of the rotor and positioning with the inner iron core of the rotor; c. The magnetic isolation bridge of the short iron core is completely disconnected to improve the power density of the motor; d. A number of axial through holes are provided on both the long and short iron cores, and the function of the holes is for die positioning, fixing the injection molding compound, and magnetizing positioning; e. The entire outer iron core of the rotor and the inner iron core of the rotor form an intermittent connection structure that seems to be connected but actually is not, for enhancing the structural strength of the rotor.

[0053] Inner iron core of the rotor: a. The iron core is formed by laminating two kinds of punching sheets, and a corresponding boss structure is formed in the middle section, and the boss structure is used for cooperation and limit with the outer iron core of the rotor. b. Corresponding positioning holes are provided on the boss in the middle section of the inner iron core for positioning with the outer iron core of the rotor.

[0054] In some embodiments, the rotor outer iron core 1 provided with the second protrusion 11 and the rotor outer iron core without the second protrusion 11 are arranged alternately in the circumferential direction, and the first protrusion 21 provided with the third protrusion 22 and the first protrusion 21 without the third protrusion 22 are arranged alternately in the circumferential direction of the rotor inner iron core 2;

[0055] Moreover, the rotor outer iron core provided with the second protrusion is opposite to the first protrusion provided with the third protrusion, the rotor outer iron core without the second protrusion is opposite to the first protrusion without the third protrusion, and the radially inner end of the rotor outer iron core without the second protrusion is not connected to the first protrusion.

[0056] This is the preferred structural form of the motor rotor of the present disclosure, that is, an alternating connection and spacing effect between the rotor outer iron core and the rotor inner iron core is formed. By making the radially inner end of the rotor outer iron core without the second protrusion opposite to and spaced from the first protrusion of the rotor inner iron core without the third protrusion, an effective magnetic isolation groove can be formed at this position, thereby effectively improving the motor power density, and thus forming a connection method in which the inner circular magnetic isolation bridge of the rotor outer iron core is intermittently connected in a seemingly connected but actually disconnected manner, which can not only enhance the rotor structure strength but also improve the motor power density.

[0057] In some embodiments, the length of the groove 12 in the axial direction of the rotor outer iron core 1 is ≥ the length of the third protrusion 22 in the axial direction. This is the preferred structural dimension relationship between the groove and the third protrusion of the present disclosure. By setting the axial length of the groove to be ≥ the axial length of the third protrusion, the third protrusion can be effectively inserted into the groove to form an effective plug-in fit, that is, a snap-fit, which plays a role in preventing circumferential rotation and axial positioning between the rotor outer iron core and the rotor inner iron core.

[0058] In some embodiments, the length of the groove 12 in the axial direction of the rotor outer iron core 1 is less than the length of the second protrusion 11 in the axial direction, and the length of the third protrusion 22 in the axial direction of the rotor inner iron core 2 is less than the first protrusion 21. This is the preferred structural form between the groove and the second protrusion and the preferred structural form between the third protrusion and the rotor inner iron core of the present disclosure. That is, the axial length of the groove is less than the axial length of the second protrusion, which can ensure that the groove does not cover the axial length of the second protrusion in the axial direction, so that when the third protrusion is inserted into the groove, axial positioning can be achieved through the upper and lower ends of the groove; the axial length of the third protrusion is less than the axial length of the first protrusion, so that the axial length of the third protrusion can be effectively matched with the groove, and the axial positioning between the rotor outer iron core and the rotor inner iron core is realized by using the cooperation between the third protrusion and the groove.

[0059] In some embodiments, the minimum axial distance between the groove 12 and one axial end face of the second protrusion 11 is greater than 0, and the minimum axial distance between the groove 12 and the other axial end face of the second protrusion 11 is also greater than 0; the minimum axial distance between the third protrusion 22 and one axial end face of the first protrusion 21 is greater than 0, and the minimum axial distance between the third protrusion 22 and the other axial end face of the first protrusion 21 is also greater than 0. This is a further preferred structural form between the groove and the second protrusion, and between the third protrusion and the first protrusion in the present disclosure, that is, the groove is located between one axial end and the other axial end of the second protrusion and does not connect to the axial end face, so that the groove can effectively axially limit the third protrusion at both ends. Neither end of the third protrusion connects to the axial end face of the first protrusion, which enables the third protrusion to match the groove and realize the axial limiting function at both axial ends between the outer iron core of the rotor and the inner iron core of the rotor.

[0060] In some embodiments, a first axial positioning hole 13 is provided on one axial end face of the second protrusion 11, and the first axial positioning hole 13 extends to communicate with the groove 12. A second axial positioning hole 23 is provided on the axial end face of the third protrusion 22 opposite to the first axial positioning hole 13. The motor rotor further includes a positioning member 3, and the positioning member 3 can be inserted into the groove 12 from the first axial positioning hole 13 and further inserted into the second axial positioning hole 23. The present disclosure also forms a first axial positioning hole on the second protrusion, a second axial positioning hole on the third protrusion, and the form that the groove communicates with the first axial positioning hole. When the third protrusion is inserted into the groove, the positioning member can be inserted into the first axial positioning hole and then into the second axial positioning hole, effectively forming the positioning and fixing between the inner iron core of the rotor and the outer iron core of the rotor, and further improving the structural strength of the rotor.

[0061] In some embodiments, the first protrusion 21 on the inner iron core 2 of the rotor is opposite to the second protrusion 11 on the outer iron core 1 of the rotor and is spaced apart by a first preset distance;

[0062] The first protrusion 21 on the inner iron core 2 of the rotor is opposite to the radially inner end of the outer iron core 1 of the rotor where the second protrusion 11 is not provided and is spaced apart by a second preset distance;

[0063] The second preset distance > the first preset distance > 0.

[0064] This is the preferred relationship between the first protrusion and the second protrusion of the inner iron core of the rotor in the present disclosure. The two are spaced apart by a first preset distance, such as Figure 4a, the two are not connected, so that a middle connection is formed between the first protrusion and the second protrusion in the axial direction, and the two ends are not connected to form a magnetic isolation groove, thereby enhancing the structural strength at the connection and increasing the motor power density at the magnetic isolation groove; and there is a second preset distance between the first protrusion and the radial inner end of the rotor outer iron core where the second protrusion is not provided, and a larger magnetic isolation groove is formed there, so that an alternating connection and non-connection with the rotor inner iron core are formed in the circumferential direction and the radial inner side of the rotor outer iron core, which can not only enhance the structural strength but also improve the motor power density.

[0065] In some embodiments, two adjacent rotor outer iron cores 1 are spaced apart by a third preset distance along the circumferential direction, and the third preset distance > 0. The present disclosure can also form a circumferential magnetic isolation groove between the rotor outer iron cores through the third preset distance formed in the circumferential direction of the rotor outer iron core, further increasing the motor power density. By using a connection method in which the outer circular magnetic isolation bridge is completely disconnected and the inner circular magnetic isolation bridge is intermittently connected in a seemingly connected but actually non-connected manner, the rotor structure strength can be enhanced and the motor power density can be improved; by using tangential limiting and axial positioning, the inner rotor iron core can be prevented from falling off along the circumferential direction, and the structural strength between the inner and outer rotor iron cores can be strengthened.

[0066] In some embodiments, a magnet 4 is further included, and the magnet 4 includes an insertion portion 41 and a limiting portion 42. The insertion portion 41 is connected to the limiting portion 42, and the insertion portion 41 can be inserted into the gap between two adjacent rotor outer iron cores 1, and the limiting portion 42 can be clamped on the axial end surface of two adjacent rotor outer iron cores 1. The present disclosure also sets the magnet to include an insertion portion and a limiting portion. The insertion portion is inserted into the gap between two adjacent rotor outer iron cores to form circumferential limitation of the magnet. The width of the limiting portion is greater than the width of the gap (the third preset distance), which can form effective axial positioning of the magnet, thereby enhancing the positioning and fixing effect of the magnet and preventing it from falling off.

[0067] Magnet (magnetic steel): The height of the magnetic steel is greater than the height of the rotor outer iron core, and the area of the magnetic tile (magnet) on the side higher than the rotor outer iron core is greater than the area of the magnetic steel groove, which can fix the magnetic steel on the rotor outer iron core, prevent the magnetic steel from falling off, and enhance the motor performance at the same time.

[0068] In some embodiments, the axial length of the magnet 4 > the axial length of the outer rotor iron core 1, the axial length of the insertion portion 41 ≥ the axial length of the outer rotor iron core 1, and the width of the limiting portion 42 in the circumferential direction > the third preset distance. That the axial length of the magnet in the present disclosure > the axial length of the outer rotor iron core enables the limiting portion to be clamped on the axial end face of the outer rotor iron core. That the axial length of the insertion portion ≥ the axial length of the outer rotor iron core can ensure that the insertion portion can be inserted into the gap between two adjacent outer rotor iron cores. The limiting portion can be clamped at the axial end face of the outer rotor iron core, and that the circumferential width of the limiting portion is greater than the third preset distance can effectively ensure that the limiting portion can axially clamp the outer rotor iron core in the axial direction to form axial limitation.

[0069] In some embodiments, there are multiple magnets 4, which are spaced apart along the circumferential direction, and one magnet 4 is arranged between two adjacent outer rotor iron cores 1; and / or, the magnet 4 is in the structure of a magnetic tile. That multiple magnets are spaced apart along the circumferential direction can form multiple magnetic fields. That one magnet is arranged between two adjacent outer rotor iron cores can effectively limit and clamp the magnet in the circumferential direction; the structure of the magnetic tile is the preferred structure form of the magnet.

[0070] In some embodiments, it further includes a potting compound 5, and the potting compound 5 is filled in at least one of the gaps between the magnet 4 and the outer rotor iron core 1, on the axial end face of the magnet 4, and on the axial end face of the outer rotor iron core 1. The present disclosure can also effectively pot and fix the outer rotor iron core, the inner rotor iron core, and the magnet after assembly through the potting compound to form an integral structure.

[0071] In some embodiments, after the potting compound 5 is filled on the axial end face of the magnet 4 and on the axial end face of the outer rotor iron core 1, a circular ring structure is formed. This is the preferred structural shape after the potting compound in the present disclosure is formed, that is, it matches the structures of the outer rotor iron core and the magnet, and effectively seals and encapsulates one axial side of the outer rotor iron core and the magnet.

[0072] In some embodiments, it further includes a damping material 6, and the damping material 6 is filled in at least one of the gaps between the inner rotor iron core 2 and the outer rotor iron core 1, the gap between the potting compound 5 and the magnet 4, on the axial end face of the inner rotor iron core 2, and on the axial end face of the outer rotor iron core 1. The present disclosure can also effectively damp the inner rotor iron core, the outer rotor iron core, the magnet, and the potting compound through the setting of the damping material, reduce the vibration between the above components during operation, and reduce noise.

[0073] In some embodiments, the damping material 6 is filled in the gap between the inner rotor iron core 2 and the outer rotor iron core 1, on the axial end faces of the inner rotor iron core 2 and the outer rotor iron core 1, and then forms an annular structure; and / or, the damping material 6 is damping rubber. This is the preferred structural shape after the damping material of the present disclosure is formed, that is, it matches the structures of the outer rotor iron core and the inner rotor iron core, and effectively seals and encapsulates one axial side of the outer rotor iron core and the inner rotor iron core. The damping material is preferably damping rubber.

[0074] In some embodiments, a magnetizing positioning hole 14 is provided on the outer rotor iron core 1, and the magnetizing positioning hole 14 is an axial through hole penetrating from one axial end face of the outer rotor iron core 1 to the other axial end face; and / or, a mold positioning hole 15 is provided on the outer rotor iron core 1, and the mold positioning hole 15 is an axial through hole penetrating from one axial end face of the outer rotor iron core 1 to the other axial end face. The present disclosure can also effectively position the magnetizing and the mold processing by providing the magnetizing positioning hole and the mold positioning hole on the outer rotor iron core.

[0075] The present disclosure also provides a motor, which includes the motor rotor described in any one of the preceding items.

[0076] A novel structure of a damping rotor is proposed to solve the production problems that cannot be solved by the prior art. The damping rotor adopts a connection method in which the outer circular magnetic isolation bridge is completely disconnected and the inner circular magnetic isolation bridge is intermittently connected in a seemingly connected but actually disconnected manner, which can not only enhance the rotor structure strength but also improve the motor power density; a tangential limit is added to the outer rotor iron core to prevent the inner rotor iron core from moving circumferentially and falling off, and axial positioning holes are added to the inner and outer rotor iron cores to strengthen the structural strength between the inner and outer rotor iron cores; a magnetizing positioning hole is added to the outer rotor iron core to solve the problem of poor magnetizing encountered in production; at the same time, the magnetic tile is fixed on the outer rotor iron core to solve the problem of abnormal motor performance caused by the magnetic tile falling off during the high-speed operation of the traditional tangential damping rotor. The specific technical solutions are as follows:

[0077] 1. The damping rotor of the present invention is composed of inner and outer rotor iron cores, permanent magnets, plastic encapsulation materials, and damping rubber. The specific structural schematic diagram is as shown in the accompanying drawings.

[0078] 2. The outer rotor iron core (such as Figure 1As shown in the figure, it adopts two structures of long and short iron cores, and all the outer circular magnetic isolation bridges are disconnected; rectangular (U-shaped, loop-shaped, circular are all acceptable, with rectangular being the best) card slots are opened on the inner circular teeth of the long iron core, and the axial length L1 of the card slot should be greater than the axial length of the inner rotor iron core. Circular (U-shaped, loop-shaped, rectangular are all acceptable, with circular being the best) positioning holes are used to place and position the inner rotor iron core. The magnetic isolation bridge of the short iron core is completely disconnected to improve the power density of the motor; several axial through holes (both circular and rectangular are acceptable) are opened on both the long and short iron cores. The function of the holes is for mold positioning, fixing the injection molding compound, and magnetizing positioning; the entire outer rotor iron core and the inner rotor iron core form a structure of being spaced and connected in a seemingly connected but actually disconnected form (as shown in the assembly drawing of the outer rotor iron core in Figure 2), which is used to enhance the structural strength of the rotor.

[0079] 3. Inner rotor iron core (as Figure 3 shown): a. The inner iron core is formed by laminating two types of punching sheets, and a corresponding convex platform structure is formed in the middle section. The axial length L2 of the convex platform should be less than the axial length L1 of the card slot of the outer rotor iron core, and the convex platform structure is used for fitting and limiting with the outer rotor iron core. b. Corresponding positioning holes are opened on the convex platform in the middle section of the inner iron core for positioning with the outer rotor iron core. The assembly structure diagram of the inner and outer iron cores is as Figure Four shown.

[0080] 4. Permanent magnet (as Figure 5 shown): The height of the permanent magnet is greater than the height of the outer rotor iron core, and the magnetic tile area on the side higher than the outer rotor iron core is greater than the area of the permanent magnet slot, which can firmly fix the permanent magnet on the outer rotor iron core, prevent the permanent magnet from falling off during the high-speed operation of the motor and causing abnormal motor performance. At the same time, the increase in the area of the permanent magnet can also enhance the performance of the motor.

[0081] 5. Place the convex platform of the inner iron core into the card slot of the outer iron core and fix it through positioning pins, dowel pins, etc., and then fix the permanent magnet on the outer rotor iron core (as Figure 6 shown), inject the molding compound (as Figure 7 shown). The molding compound fills the gap between the magnetic tile and the outer rotor iron core, half of the magnetizing positioning holes, half of the mold positioning holes, and the end faces of the magnetic tile and the outer rotor iron core.

[0082] 6. Inject the damping rubber into the gap between the inner and outer rotor iron cores, the gap between the molding compound and the end face of the permanent magnet, and the end faces of the inner and outer iron cores. A circular ring is formed at the end (as Figure 8 shown). The molding compound has a high hardness and large structural strength and mainly plays a connecting role. The damping rubber has a relatively low hardness and mainly plays a damping and buffering role.

[0083] The above are only the preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure. The above is only the preferred implementation manner of the present disclosure. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present disclosure, several improvements and variations can be made, and these improvements and variations should also be regarded as within the protection scope of the present disclosure.

Claims

1. A motor rotor, characterized in that: Comprising: A rotor outer iron core (1) and a rotor inner iron core (2), there are a plurality of the rotor outer iron cores (1), and the plurality of rotor outer iron cores (1) are arranged in a circumferential direction and are all arranged radially outside the rotor inner iron core (2). A first protruding portion (21) is protrudingly provided on the outer circumference of the rotor inner iron core (2) in the radially outward direction, and the first protruding portion (21) faces the rotor outer iron core (1). And there is at least one second protruding portion (11) provided on the radially inner circumference of the rotor outer iron core (1), and the second protruding portion (11) can cooperate with the first protruding portion (21) to perform circumferential positioning and / or axial positioning between the rotor outer iron core (1) and the rotor inner iron core (2); A third protruding portion (22) is further provided on the first protruding portion (21) on the rotor inner iron core (2), the third protruding portion (22) protrudes towards the rotor outer iron core (1) and faces the second protruding portion (11), and a groove (12) is provided on the second protruding portion (11), and the third protruding portion (22) can be inserted into the groove (12) to form positioning; The rotor outer iron cores (1) provided with the second protruding portion (11) and the rotor outer iron cores without the second protruding portion (11) are alternately arranged in the circumferential direction, and the first protruding portions (21) provided with the third protruding portion (22) and the first protruding portions (21) without the third protruding portion (22) are alternately arranged in the circumferential direction of the rotor inner iron core (2); And the rotor outer iron cores provided with the second protruding portion are opposite to the first protruding portions provided with the third protruding portion, the rotor outer iron cores without the second protruding portion are opposite to the first protruding portions without the third protruding portion, and the radially inner ends of the rotor outer iron cores without the second protruding portion are not connected to the first protruding portion.

2. The motor rotor according to claim 1, wherein: The length of the groove (12) in the axial direction of the rotor outer iron core (1) ≥ the length of the third protruding portion (22) in the axial direction.

3. The motor rotor according to claim 1, wherein: The length of the groove (12) in the axial direction of the rotor outer iron core (1) is less than the length of the second protruding portion (11) in the axial direction, and the length of the third protruding portion (22) in the axial direction of the rotor inner iron core (2) is less than the first protruding portion (21).

4. The motor rotor according to claim 3, wherein: The minimum axial distance between the groove (12) and one axial end face of the second protruding portion (11) is greater than 0, and the minimum axial distance between the groove (12) and the other axial end face of the second protruding portion (11) is also greater than 0; the minimum axial distance between the third protruding portion (22) and one axial end face of the first protruding portion (21) is greater than 0, and the minimum axial distance between the third protruding portion (22) and the other axial end face of the first protruding portion (21) is also greater than 0.

5. The motor rotor according to claim 1, wherein: On one axial end face of the second protruding portion (11), a first axial positioning hole (13) is provided, and the first axial positioning hole (13) extends to communicate with the groove (12). On the axial end face of the third protruding portion (22) opposite to the first axial positioning hole (13), a second axial positioning hole (23) is provided. The motor rotor further includes a positioning member (3), and the positioning member (3) can be inserted into the groove (12) from the first axial positioning hole (13) and further into the second axial positioning hole (23).

6. The motor rotor according to claim 1, wherein: The first protruding portion (21) on the inner rotor iron core (2) is opposite to the second protruding portion (11) on the outer rotor iron core (1) and is spaced apart by a first preset distance; The first protruding portion (21) on the inner rotor iron core (2) is opposite to the radially inner end of the outer rotor iron core (1) where the second protruding portion (11) is not provided and is spaced apart by a second preset distance; The second preset distance > the first preset distance > 0.

7. The motor rotor according to claim 1, wherein: Adjacent two of the outer rotor iron cores (1) are spaced apart by a third preset distance along the circumferential direction, and the third preset distance > 0.

8. The motor rotor according to claim 7, wherein: It further includes a magnet (4), and the magnet (4) includes an insertion portion (41) and a limiting portion (42). The insertion portion (41) is connected to the limiting portion (42), and the insertion portion (41) can be inserted into the space between adjacent two of the outer rotor iron cores (1), and the limiting portion (42) can be clamped on one axial end face of adjacent two of the outer rotor iron cores (1).

9. The motor rotor according to claim 8, wherein: The axial length of the magnet (4) > the axial length of the outer rotor iron core (1), the axial length of the insertion portion (41) ≥ the axial length of the outer rotor iron core (1), and the width of the limiting portion (42) in the circumferential direction > the third preset distance.

10. The motor rotor according to claim 8, wherein: There are multiple magnets (4), and they are distributed at intervals along the circumferential direction, and one magnet (4) is provided between adjacent two of the outer rotor iron cores (1); and / or, the magnet (4) is in the structure of a magnetic tile.

11. The motor rotor according to claim 8, wherein: It further includes a potting compound (5), and the potting compound (5) is filled in at least one of the gaps between the magnet (4) and the outer rotor iron core (1), on the axial end faces of the magnet (4), and on the axial end faces of the outer rotor iron core (1).

12. The motor rotor according to claim 11, wherein: After the potting compound (5) is filled on the axial end faces of the magnet (4) and the outer rotor iron core (1), a circular ring structure is formed.

13. The motor rotor according to claim 11, characterized in that: It further includes a vibration damping material (6), and the vibration damping material (6) is filled in at least one position among the gap between the inner iron core (2) and the outer iron core (1) of the rotor, the gap between the potting material (5) and the magnet (4), the axial end surface of the inner iron core (2) of the rotor, and the axial end surface of the outer iron core (1) of the rotor.

14. The motor rotor according to claim 13, characterized in that: After the vibration damping material (6) is filled in the gap between the inner iron core (2) and the outer iron core (1) of the rotor, the axial end surface of the inner iron core (2) of the rotor, and the axial end surface of the outer iron core (1) of the rotor, a circular ring-shaped structure is formed; and / or, the vibration damping material (6) is a vibration damping rubber.

15. The motor rotor according to any one of claims 1-14, characterized in that: The outer iron core (1) of the rotor is provided with a magnetizing positioning hole (14), and the magnetizing positioning hole (14) is an axial through hole penetrating from one axial end surface of the outer iron core (1) of the rotor to the other axial end surface; and / or, the outer iron core (1) of the rotor is provided with a mold positioning hole (15), and the mold positioning hole (15) is an axial through hole penetrating from one axial end surface of the outer iron core (1) of the rotor to the other axial end surface.

16. A motor, characterized in that: It includes the motor rotor according to any one of claims 1-15.

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