Rotor assembly and motor using same

Abstract

The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor using the rotor assembly, which comprise a rotor core, a rotor shaft penetrating through the rotor core, and an insulating framework and a magnetic ring structure which are sleeved on the rotor shaft, the magnetic ring structure comprises an induction magnetic ring and a magnetic ring support which are integrally formed in an injection molding mode. A matching hole suitable for the rotor shaft to pass through is formed in the magnetic ring bracket; the matching hole comprises a first inner diameter hole and a second inner diameter hole which are communicated with each other; the first inner diameter hole is used for forming fixed fit with a rotor shaft, and the second inner diameter hole is used for forming fixed fit with an insulating framework. According to the utility model, the stability of the use performance of the adopted magnetic ring structure can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor using the rotor assembly. Background Art

[0002] The motor magnetic ring is mainly used for detection by the control circuit board to determine the position of the rotor magnetic pole. It is mainly used in the DC motor or permanent magnet synchronous motor with an inner rotor. Specifically, during the use of the motor magnetic ring, the magnetic ring and the rotor are installed on the same shaft, and there is a specific position relationship between the magnetic ring pole and the rotor pole. In this way, through this specific position relationship, as long as the position of the magnetic ring pole can be detected, the position of the rotor pole can be determined, so that the current corresponding to the rotor magnetic pole position can be correctly applied to the stator winding.

[0003] Specifically, in one prior art, the motor magnetic ring includes a magnetic ring body and a magnetic ring bracket connected by glue. After the motor magnetic ring with this structure is assembled with the motor, when the whole machine is run-in at no-load, the magnetic ring assembly assembly used in the rotor assembly is glued, the magnetic ring assembly is not firmly bonded, and the crimping time is insufficient. When running at no-load and high speed, the magnetic ring assembly bonded with glue is easily thrown off, and then there is a defect that the Hall cannot sense when the whole machine is tested for performance. In actual production, it is impossible to effectively detect and find poorly bonded magnetic ring assemblies. Such poor bonding can only be discovered when the motor is in use, and the proportion of problems is higher, and the quality loss is greater.

[0004] In another prior art, the motor magnetic ring includes a magnetic ring body and a magnetic ring bracket connected by integral injection molding. The magnetic ring is structurally wrapped by injection molding and axially fixed. The motor magnetic ring under this structure is interference fit with the motor shaft through the magnetic ring bracket. In this regard, actual research has found the following problems:

[0005] Firstly, the interference fit method may cause the magnetic ring to crack; secondly, only one surface of the magnetic ring body contacts the magnetic ring bracket, which makes the position of the magnetic ring body unreliable, affecting the sensing accuracy, thereby reducing the working efficiency of the motor.

[0006] In summary, with regard to the problems existing in the magnetic ring assembly generally used in the prior art, it is necessary to further optimize and improve its structure so as to improve its structural stability. Utility Model Content

[0007] The first object of the utility model is to provide a rotor assembly to solve the technical problem of improving the stability of the performance of the magnetic ring structure adopted by the rotor assembly.

[0008] The second object of the utility model is to provide a motor to solve the technical problem of improving the stability of the performance of the magnetic ring assembly used in the motor.

[0009] The rotor assembly of the utility model is realized as follows:

[0010] A rotor assembly comprises: a rotor core, a rotor shaft penetrating the rotor core, and an insulating frame and a magnetic ring structure sleeved on the rotor shaft;

[0011] The magnetic ring structure comprises an induction magnetic ring and a magnetic ring bracket which are integrally injection molded;

[0012] The magnetic ring bracket is provided with a matching hole suitable for the rotor shaft to pass through; and

[0013] The matching hole includes a first inner diameter hole and a second inner diameter hole which are connected through each other;

[0014] The first inner diameter hole is used to form a fixed fit with the rotor shaft, and the second inner diameter hole is used to form a fixed fit with the insulating frame.

[0015] In an optional embodiment of the present invention, the first inner diameter hole and the outer side wall of the rotor shaft are in transition fit.

[0016] In an optional embodiment of the utility model, the insulating frame includes an end frame and an axial sleeve connected to the end frame;

[0017] The shaft sleeve and the end frame are integrally formed with a through hole suitable for the rotor shaft to pass through.

[0018] In an optional embodiment of the present invention, the inner diameter of the second inner diameter hole is greater than the inner diameter of the first inner diameter hole; and

[0019] The second inner diameter hole is in interference fit with the outer side wall of the shaft sleeve.

[0020] In an optional embodiment of the present invention, a plurality of convex ribs are arranged on the wall of the second inner diameter hole at intervals along the circumferential direction thereof; and

[0021] The side end surfaces of the plurality of convex ribs facing the center of the second inner diameter hole are located on the same circumferential surface, so that the plurality of convex ribs are in interference fit with the outer side wall of the shaft sleeve.

[0022] In an optional embodiment of the utility model, the magnetic ring bracket further includes a first connecting ring and a second connecting ring provided on the outer circular side wall of the matching hole;

[0023] The first connecting ring and the second connecting ring are spaced apart and distributed along the axial direction of the matching hole, so that a matching groove for embedding the induction magnetic ring is formed between the first connecting ring and the second connecting ring.

[0024] In an optional embodiment of the present invention, at least one recessed groove is provided at intervals on the axial end surface of the first connecting ring facing the second connecting ring; and / or

[0025] At least one protrusion is provided at intervals on the axial end surface of the first connecting ring facing the second connecting ring; and

[0026] The induction magnetic ring is provided with a structure adapted to the concave groove and / or the convex block.

[0027] In an optional embodiment of the present invention, at least one groove is provided at intervals on the axial end surface of the second connecting ring facing the first connecting ring; and / or

[0028] At least one protrusion is provided at intervals on the axial end surface of the second connecting ring facing the first connecting ring; and

[0029] The induction magnetic ring is provided with a structure adapted to the groove and / or the protrusion.

[0030] In an optional embodiment of the present invention, the second connecting ring is arranged on the outer circular side wall of the second inner diameter hole, and the first connecting ring is arranged on the outer circular side wall of the first inner diameter hole.

[0031] In an optional embodiment of the present invention, the outer diameter of the second connecting ring is greater than the outer diameter of the induction magnetic ring.

[0032] In an optional embodiment of the present invention, the induction magnetic ring is made of injection-molded ferrite, and the magnetic ring bracket is made of plastic.

[0033] The motor of the utility model is realized as follows:

[0034] A motor comprises: the rotor assembly.

[0035] By adopting the above technical solution, the utility model has the following beneficial effects: the rotor assembly of the utility model and the motor using the rotor assembly, the magnetic ring structure adopted by the utility model, through the improvement of the assembly hole therein, makes the first inner diameter hole of the assembly hole used to form a fixed fit with the rotor shaft, and the second inner diameter hole used to form a fixed fit with the insulating frame. That is to say, the overall magnetic ring structure is not only supported by the rotor shaft in the rotor assembly, but also supported by the insulating frame. Therefore, on the one hand, the stability of the assembly and fixing structure formed by the magnetic ring structure as a whole in the rotor assembly can be ensured, and the probability of magnetic ring cracking can be reduced. On the other hand, the magnetic ring structure can be made to withstand sufficient torque, and at the same time, the relative position of the magnetic ring structure on the rotor can be made more precise, ensuring the concentricity of the outer circle of the magnetic ring structure and the rotor shaft, so that the rotor assembly can run smoothly at high speed, reduce motor jitter, thereby ensuring high-efficiency operation of the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a schematic structural diagram of a rotor assembly of Example 1 of the utility model;

[0037] Figure 2 Shown Figure 1 A magnified view of part A;

[0038] Figure 3 Shown is a schematic structural diagram of an insulating skeleton of a rotor assembly of Example 1 of the utility model;

[0039] Figure 4 Shown is a schematic diagram of the magnetic ring structure of the rotor assembly of Example 1 of the utility model;

[0040] Figure 5 Shown Figure 4 A sectional view of part A;

[0041] Figure 6 Shown Figure 4 A cross-sectional view of part B;

[0042] Figure 7 The figure is a first-view structural schematic diagram of a magnetic ring bracket of a magnetic ring structure of a rotor assembly of Example 1 of the utility model;

[0043] Figure 8 Shown Figure 7 A sectional view of part A;

[0044] Fig. 9 The figure shows a second perspective structural schematic diagram of a magnetic ring bracket of a magnetic ring structure of a rotor assembly of Example 1 of the utility model;

[0045] Fig.10 The figure is a third perspective structural schematic diagram of the magnetic ring bracket of the magnetic ring structure of the rotor assembly of Example 1 of the utility model;

[0046] Fig.11 The figure shows a schematic structural diagram of an induction magnetic ring of a magnetic ring structure of a rotor assembly of Example 1 of the utility model;

[0047] Fig.12 The figure shows a schematic diagram of the structure of a series-excited reduction motor according to Embodiment 2 of the present utility model;

[0048] Fig.13 Shown is a schematic structural diagram of a DC motor in Example 2 of the utility model.

[0049] In the figure: rotor core 1, rotor shaft 2, end frame 31, shaft sleeve 32, coil 4, induction magnetic ring 51, protrusion 511, sink groove 512, magnetic ring bracket 52, first inner diameter hole 531, second inner diameter hole 532, convex rib 533, first connecting ring 541, second connecting ring 542, recessed groove 543, groove 544, protrusion 545, motor gear box assembly 61, rotor assembly 62, stator assembly 63, motor front bracket assembly 64, motor rear bracket assembly 65, wind collecting cover 66, fan blade 67, motor front end cover assembly 71, motor stator assembly 72, motor rear cover assembly 73. DETAILED DESCRIPTION

[0050] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] See also Figures 1 to 11 As shown, this embodiment provides a rotor assembly, including: a rotor core 1, a rotor shaft 2 passing through the rotor core 1, and an insulating frame and a magnetic ring structure sleeved on the rotor shaft 2; wherein, for the insulating frame, in this embodiment, in order to simultaneously satisfy the cooperation with the rotor shaft 2 and the coil 4, the insulating frame includes an end frame 31 and a shaft sleeve 32 connected to the end frame 31, the end frame 31 is arranged at the axial side end of the rotor core 1, and the shaft sleeve 32 and the end frame 31 are integrally formed with a through hole suitable for the rotor shaft 2 to pass through. From the axial dimension of the rotor shaft 2, the rotor shaft 2 passes through the rotor core 1, the insulating frame and the magnetic ring structure in sequence.

[0053] On the basis of the above structure, it will be explained that the magnetic ring structure adopted in this embodiment includes an induction magnetic ring 51 and a magnetic ring bracket 52 which are integrally injection-molded; a matching hole suitable for the rotor shaft 2 to pass through is provided in the magnetic ring bracket 52.

[0054] In a specific optional implementation, the material of the induction magnetic ring 51 is injection-molded ferrite, and the material of the magnetic ring bracket 52 is plastic. The induction magnetic ring 51 and the magnetic ring bracket 52 are integrally injection-molded, which has a simple structure, low cost, convenient processing, high efficiency, high dimensional accuracy, and can ensure reliability of use.

[0055] For the matching hole of this embodiment, it can not only be used to match with the rotor shaft 2, but also can be used to match with the insulating frame. The matching hole includes a first inner diameter hole 531 and a second inner diameter hole 532 that are connected to each other; wherein the first inner diameter hole 531 is used to form a fixed match with the rotor shaft 2, and the second inner diameter hole 532 is used to form a fixed match with the insulating frame.

[0056] In this regard, in a preferred implementation, firstly, the first inner diameter hole 531 is in transition fit with the outer wall of the rotor shaft 2 , and the transition fit can reduce the risk of cracking of the magnetic ring structure due to interference fit with the rotor shaft 2 .

[0057] Secondly, the inner diameter of the second inner diameter hole 532 is larger than the inner diameter of the first inner diameter hole 531; and the second inner diameter hole 532 and the outer wall of the shaft sleeve 32 are in an interference fit. The interference fit here can ensure that the magnetic ring structure can withstand sufficient torque and the relative position is more precise, and ensure the concentricity of the outer circle of the magnetic ring structure and the motor shaft, and the bottom end diameter runout is normal, so that the rotor assembly 62 can run smoothly at high speed, reduce the jitter of the motor using the rotor assembly 62, thereby ensuring high-efficiency operation of the motor and extending the service life of the motor.

[0058] In addition, it should be noted that the axial depths of the first inner diameter hole 531 and the second inner diameter hole 532 may be the same or different. The drawings of this embodiment only take the case where the two are approximately the same as an example, and are not used as an absolute limitation on the axial depths of the first inner diameter hole 531 and the second inner diameter hole 532. Of course, in order to improve the reliability of the connection structure formed by the overall magnetic ring structure and the rotor shaft 2 and the insulating frame, even if the axial depths of the first inner diameter hole 531 and the second inner diameter hole 532 are different, the difference between the two should not be too large.

[0059] Based on the above structure, the following improvement can be made: multiple convex ribs 533 are arranged at intervals along the circumferential direction of the hole wall of the second inner diameter hole 532. The multiple convex ribs 533 preferably adopt the same structure, and the multiple convex ribs 533 can be arranged evenly. In this regard, it should be noted that the side end surfaces of the multiple convex ribs 533 facing the center of the second inner diameter hole 532 are located on the same circumferential surface, so that the multiple convex ribs 533 and the outer side wall of the shaft sleeve 32 are in interference fit. That is to say, under this structure, for the second inner diameter hole 532, it is the convex ribs 533 that are actually in direct contact with the outer side wall of the shaft sleeve 32.

[0060] Next, the magnetic ring bracket 52 itself also includes a first connecting ring 541 and a second connecting ring 542 arranged on the outer circular side wall of the matching hole; specifically, the first connecting ring 541 and the second connecting ring 542 are spaced apart along the axial direction of the matching hole, so that a matching groove for embedding the induction magnetic ring 51 is formed between the first connecting ring 541 and the second connecting ring 542. Under this structure, that is to say, for the overall induction magnetic ring 51, it and the magnetic ring bracket 52 have three different dimensions of contact matching surfaces at the same time, and these three different dimensions are the first connecting ring 541, the second connecting ring 542 and the outer circular side wall of the matching hole. Through the matching of three different dimensions, the reliability of the connection structure formed by the induction magnetic ring 51 and the magnetic ring bracket 52 can be greatly improved.

[0061] Furthermore, from a reliable implementation, the second connecting ring 542 is provided on the outer circumferential side wall of the second inner diameter hole 532, and the first connecting ring 541 is provided on the outer circumferential side wall of the first inner diameter hole 531. Based on this structure, when the rotor assembly 62 is assembled in place, the second connecting ring 542 is located between the first connecting ring 541 and the end frame 31.

[0062] Based on the above situation, it should be noted that, in the present embodiment, under the preferred implementation mode, the outer diameter of the second connecting ring 542 is greater than the outer diameter of the induction magnetic ring 51. The significance of such a design is to increase the contact surface between the magnetic ring bracket 52 and the induction magnetic ring 51, thereby enhancing the reliability of the matching structure formed by the two. In addition, on the basis that the magnetic ring bracket 52 is made of plastic material as a whole, the second connecting ring 542 also has an insulating effect, and the second connecting ring 542 is located between the end frame 31 and the induction magnetic ring 51, which can not only ensure that there is enough creepage distance between the coil 4 and the induction magnetic ring 51 in the rotor assembly, but also shorten the distance between the induction magnetic ring 51 and the coil 4, thereby saving the axial dimension of the rotor shaft 2, shortening the total height dimension of the motor, and reducing the cost of the motor.

[0063] It is necessary to explain here that the outer diameters of the first connecting ring 541 and the second connecting ring 542 may be the same or different. In different cases, it is preferred that the outer diameter of the first connecting ring 541 is smaller than the outer diameter of the second connecting ring 542. In this case, it can both meet the use requirements of this embodiment and save material costs.

[0064] Next, the firmness of the integral injection-molded structure formed between the magnetic ring bracket 52 and the induction magnetic ring 51 is improved. The present embodiment has the following designs:

[0065] First, there is the first connecting ring 541, on which at least one recessed groove 543 is arranged at intervals on the axial end face facing the second connecting ring 542; and / or at least one protruding block is arranged at intervals on the axial end face of the first connecting ring 541 facing the second connecting ring 542. Of course, a corresponding structure adapted to the recessed groove 543 and / or the protruding block is provided on the induction magnetic ring 51. That is to say, the first connecting ring 541 can be designed with both recessed grooves 543 and protruding blocks, or it can be designed with either recessed grooves 543 or protruding blocks. When recessed grooves 543 and protruding blocks are designed at the same time, optionally, the recessed grooves 543 and the protruding blocks can be arranged in a staggered distribution, that is, one recessed groove 543, one protruding block, another recessed groove 543 and one protruding block are arranged in a distribution manner along the circumferential direction. In terms of quantity, it is preferred to design more than two recessed grooves 543 or raised blocks. The increase in number can increase the bonding force between the induction magnetic ring 51 and the first connecting ring 541, thereby improving the firmness of the connection structure formed by the two. At the same time, it can also effectively ensure the stability and reliability of the position of the induction magnetic ring 51 on the magnetic ring bracket 52, that is, ensure the stability of the axial and radial positions of the induction magnetic ring 51, enhance the induction accuracy of the induction magnetic ring 51, and improve the motor efficiency.

[0066] Next is the second connecting ring 542, on which at least one groove 544 is arranged at intervals on the axial end surface facing the first connecting ring 541; and / or at least one protrusion 545 is arranged at intervals on the axial end surface of the second connecting ring 542 facing the first connecting ring 541. Of course, a corresponding structure adapted to the groove 544 and / or the protrusion 545 is provided on the induction magnetic ring 51, such as a raised position 511 adapted to the groove 544 and a sunken groove 512 adapted to the protrusion 545. That is to say, the second connecting ring 542 can be designed with both the groove 544 and the protrusion 545, or it can be designed with either the groove 544 or the protrusion 545. When the groove 544 and the protrusion 545 are designed at the same time, in an optional case, the groove 544 and the protrusion 545 can be arranged in a staggered distribution, that is, one groove 544, one protrusion 545, and then another groove 544 and one protrusion 545 are arranged in a distribution manner along the circumferential direction. In terms of quantity, it is preferred to design more than two grooves 544 or protrusions 545. The increase in quantity can improve the bonding force between the induction magnetic ring 51 and the second connecting ring 542, thereby improving the firmness of the connection structure formed by the two. At the same time, it can also effectively ensure the stability and reliability of the position of the induction magnetic ring 51 on the magnetic ring bracket 52, that is, ensure the stability of the axial and radial positions of the induction magnetic ring 51, enhance the induction accuracy of the induction magnetic ring 51, and improve the motor efficiency.

[0067] Finally, it should be noted that, for the rotor assembly 62 used in this embodiment, the magnetic ring structure has high reliability during use, is convenient and efficient to process, and has controllable production costs.

[0068] Embodiment 2:

[0069] See also Fig.12 and Fig.13 As shown, based on the rotor assembly 62 of embodiment 1, this embodiment provides a motor, which includes the rotor assembly 62 of embodiment 1. For the motor used in this embodiment, the motor here can be, for example but not limited to, a DC motor or a series-excited reduction motor.

[0070] First, in conjunction with the DC motor used in mature technology, it generally includes a motor front cover assembly 71, a motor stator assembly 72, a rotor assembly 62, a motor rear cover assembly 73, etc. Among them, the motor front cover assembly 71 is mainly used to install bearings, and plays a role in fixing the rotor assembly 62 and the output shaft. The motor stator assembly 72 generates a magnetic field by making a casing of permanent magnet material and magnetic conductive material, drives the rotor assembly to operate, and outputs torque. After the coil in the rotor assembly 62 is energized, it generates a magnetic flux with the stator magnetic field, drives the rotor to rotate, and generates torque. The motor rear cover assembly 73 has the same function as the front cover assembly 71, and is mainly used to install bearings, and plays a role in fixing the rotor assembly 62.

[0071] Secondly, in combination with the series-excited reduction motor used in mature technology, it generally includes a motor gearbox assembly 61, a rotor assembly 62, a stator assembly 63, a motor front bracket assembly 64, a motor rear bracket assembly 65, a wind collector 66, a fan blade 67 and other structures. For the multiple structures here, mature technical means can be optionally adopted, and the specific implementation principle is not absolutely limited in this embodiment. It should be noted that when the rotor assembly 62 adopts the rotor assembly 62 of Example 1, the reliability of the series-excited reduction motor as a whole can be guaranteed, the operating efficiency can be improved, the risk of rework of the product can be reduced, and it has the advantages of simple manufacturing and low cost.

[0072] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0073] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0074] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0075] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A rotor assembly, characterized in that: include: A rotor core, a rotor shaft penetrating the rotor core, and an insulating frame and a magnetic ring structure sleeved on the rotor shaft; in The magnetic ring structure comprises an induction magnetic ring and a magnetic ring bracket which are integrally injection molded; The magnetic ring bracket is provided with a matching hole suitable for the rotor shaft to pass through; and The matching hole includes a first inner diameter hole and a second inner diameter hole which are connected through each other; The first inner diameter hole is used to form a fixed fit with the rotor shaft, and the second inner diameter hole is used to form a fixed fit with the insulating frame.

2. The rotor assembly according to claim 1, characterized in that: The first inner diameter hole is in transitional fit with the outer side wall of the rotor shaft.

3. The rotor assembly according to claim 1 or 2, characterized in that: The insulating frame includes an end frame and an axle sleeve connected to the end frame; The shaft sleeve and the end frame are integrally formed with a through hole suitable for the rotor shaft to pass through.

4. The rotor assembly according to claim 3, characterized in that: The inner diameter of the second inner diameter hole is greater than the inner diameter of the first inner diameter hole; and The second inner diameter hole is in interference fit with the outer side wall of the shaft sleeve.

5. The rotor assembly according to claim 4, characterized in that: A plurality of convex ribs are arranged on the wall of the second inner diameter hole at intervals along the circumferential direction thereof; and The side end surfaces of the plurality of convex ribs facing the center of the second inner diameter hole are located on the same circumferential surface, so that the plurality of convex ribs are in interference fit with the outer side wall of the shaft sleeve.

6. The rotor assembly according to claim 1, characterized in that The magnetic ring bracket also includes a first connecting ring and a second connecting ring arranged on the outer circular side wall of the matching hole; The first connecting ring and the second connecting ring are spaced apart and distributed along the axial direction of the matching hole, so that a matching groove for embedding the induction magnetic ring is formed between the first connecting ring and the second connecting ring.

7. The rotor assembly according to claim 6, characterized in that At least one recessed groove is provided at intervals on the axial end surface of the first connecting ring facing the second connecting ring; and / or At least one protrusion is provided at intervals on the axial end surface of the first connecting ring facing the second connecting ring; and The induction magnetic ring is provided with a structure adapted to the concave groove and / or the convex block.

8. The rotor assembly according to claim 6 or 7, characterized in that: At least one groove is provided at intervals on the axial end surface of the second connecting ring facing the first connecting ring; and / or At least one protrusion is provided at intervals on the axial end surface of the second connecting ring facing the first connecting ring; and The induction magnetic ring is provided with a structure adapted to the groove and / or the protrusion.

9. The rotor assembly according to claim 6 or 7, characterized in that: The second connecting ring is arranged on the outer circular side wall of the second inner diameter hole, and the first connecting ring is arranged on the outer circular side wall of the first inner diameter hole.

10. The rotor assembly according to claim 9, characterized in that The outer diameter of the second connecting ring is greater than the outer diameter of the induction magnetic ring.

11. The rotor assembly according to claim 1, characterized in that The induction magnetic ring is made of injection-molded ferrite, and the magnetic ring bracket is made of plastic.

12. A motor, characterized in that: include: A rotor assembly as claimed in any one of claims 1 to 11.

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