Rotor assembly and motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a rotor assembly and a motor, the rotor assembly comprises a core shaft, an iron core assembly, magnetic steel and a compression ring assembly, and the core shaft sequentially comprises a rotating shaft, a radial plate and a ring frame from inside to outside; the pressing ring assembly comprises a first pressing ring and a second pressing ring which are correspondingly arranged at the two ends of the ring frame, and the first pressing ring is fixed to the peripheral wall of one end of the ring frame and integrally formed with the ring frame. The second pressing ring comprises a check ring and a connecting sleeve, the check ring is attached to the end face of the other end of the ring frame and protrudes out of the peripheral wall of the ring frame, and the connecting sleeve is arranged on the inner side of the ring frame in a penetrating mode and is in threaded connection with the ring frame. In the rotor assembly provided by the utility model, the first compression ring is integrally formed at one end of the ring frame, and the connecting sleeve of the second compression ring is provided with the thread to be connected with the ring frame, so that compared with a traditional compression ring assembly, a plurality of bolts required during assembly can be omitted, the cost can be effectively reduced, and the assembly process can be simplified.

Description

Technical Field

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

[0002] The rotor assembly is one of the important components of a motor, which includes a core shaft, an iron core assembly arranged on the core shaft, magnetic steel embedded in the iron core assembly, and a retaining ring assembly for limiting the iron core assembly. The existing retaining ring assembly usually uses multiple bolts to fix on the core shaft, involving a large number of components, high cost, and complex assembly process. Summary of the Utility Model

[0003] In order to reduce the production cost of the rotor assembly and simplify the assembly process, the utility model provides a rotor assembly and a motor.

[0004] According to an embodiment of the utility model, in a first aspect, a rotor assembly is provided, including:

[0005] A core shaft, which sequentially includes a rotating shaft, a web plate, and a ring frame from inside to outside;

[0006] An iron core assembly, sleeved on the outer peripheral wall of the ring frame, which includes rotor punching sheets and iron core end plates. The rotor punching sheets are stacked axially, and the rotor punching sheets are clamped between the iron core end plates;

[0007] Magnetic steel, embedded in the rotor punching sheets;

[0008] A retaining ring assembly, which includes a first retaining ring and a second retaining ring correspondingly arranged at both ends of the ring frame. The first retaining ring is fixed on the outer peripheral wall of one end of the ring frame and is integrally formed with the ring frame; the second retaining ring includes a snap ring and a connecting sleeve. The snap ring fits on the end face of the other end of the ring frame and protrudes from the outer peripheral wall of the ring frame. The connecting sleeve passes through the inside of the ring frame and is threadedly connected with the ring frame.

[0009] In some embodiments, an external thread is provided on the outer peripheral wall of the connecting sleeve, and a matching internal thread is correspondingly provided on the inner peripheral wall of the ring frame. The helix direction of the external thread is opposite to the rotation direction of the core shaft.

[0010] In some embodiments, a tightening notch is provided on the outer peripheral wall of the snap ring.

[0011] In some embodiments, the number of the tightening notches is an even number, and the tightening notches are evenly arranged circumferentially.

[0012] In some embodiments, the iron core end plate is provided with an inwardly concave abutting step to correspondingly abut against the first retaining ring and the snap ring.

[0013] In some embodiments, a limiting groove is further formed on the outer peripheral wall of the ring frame, and the limiting groove axially penetrates through the ring frame and the first pressing ring; limiting bumps adapted to the limiting groove are provided on the iron core end plate and the rotor punching sheet.

[0014] In some embodiments, a weight-reducing hole is formed in the web plate.

[0015] In some embodiments, the number of the weight-reducing holes is an even number, and the weight-reducing holes are uniformly arranged in the circumferential direction.

[0016] In some embodiments, the rotating shaft, the web plate and the ring frame are integrally formed.

[0017] According to an embodiment of the present invention, a second aspect provides a motor, and the motor includes the aforementioned rotor assembly.

[0018] In the rotor assembly of the present invention, the first pressing ring is integrally formed at one end of the ring frame, and a thread is provided on the connecting sleeve of the second pressing ring to connect with the ring frame. Compared with the traditional fixing method of the pressing ring assembly, a plurality of bolts required during assembly can be omitted, the cost can be effectively reduced, and the assembly process can be simplified. Since the traditional pressing ring assembly is fixed to the ring frame by bolts, a sufficient thickness needs to be reserved on the end face of the ring frame to form a threaded hole. After the bolts are omitted in the rotor assembly of this embodiment, the thickness of the ring frame can be adaptively reduced, saving materials. Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the rotor assembly of this embodiment;

[0020] Figure 2 is an axonometric structural diagram of the connection between the pressing ring assembly and the core shaft of this embodiment;

[0021] Figure 3 is a schematic structural diagram of the second pressing ring of this embodiment;

[0022] Figure 4 is a schematic structural diagram of the iron core end plate of this embodiment.

[0023] In the figure: core shaft 10; rotating shaft 11; web plate 12; weight-reducing hole 121; ring frame 13; limiting groove 14; iron core assembly 20; rotor punching sheet 21; iron core end plate 22; abutting step 221; limiting bump 223; first pressing ring 30; second pressing ring 31; retaining ring 311; connecting cylinder 312; tightening notch 313; magnetic steel 40. Detailed Embodiments

[0024] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0025] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the objectives that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0026] The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "middle", "longitudinal", "transverse", "horizontal", "inner", "outer", "radial", "circumferential", etc. cited in this specification is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified 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 of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] As Figure 1 shown, this embodiment provides a rotor assembly, which includes a core shaft 10, a core iron assembly 20, a magnet 40 and a retaining ring assembly. The core shaft 10 of this embodiment sequentially includes a rotating shaft 11, an annular spoke plate 12 and a cylindrical ring frame 13 from inside to outside. The outer peripheral wall of the rotating shaft 11 is fixedly connected to the inner peripheral wall of the spoke plate 12, and the outer peripheral wall of the spoke plate 12 is fixedly connected to the inner peripheral wall of the ring frame 13. The core iron assembly 20 is sleeved on the outer peripheral wall of the ring frame 13.

[0028] This embodiment preferably integrally forms the rotating shaft 11, the spoke plate 12 and the ring frame 13 to ensure the structural strength of the core shaft 10 and reduce the assembly steps of the rotor assembly. In some embodiments, the rotating shaft 11, the spoke plate 12 and the ring frame 13 can be designed into a split structure according to requirements, and different materials are used to make the rotating shaft 11, the spoke plate 12 and the ring frame 13 to reduce production costs.

[0029] The core iron assembly 20 of this embodiment preferably includes rotor punching sheets 21 and core iron end plates 22. Multiple rotor punching sheets 21 are stacked along the axial direction, and the core iron end plates 22 are arranged at both ends of the stacked multiple rotor punching sheets 21, so that the multiple rotor punching sheets 21 are clamped between the core iron end plates 22. Embedded grooves are formed on the rotor punching sheets 21 of this embodiment, and the magnet 40 is embedded in the embedded grooves. It should be noted that the structures and connection methods of the core iron assembly 20 and the magnet 40 in this embodiment are all prior arts and will not be elaborated here.

[0030] See specifically Figures 2-3 Figures 2-3 , the clamping ring assembly of this embodiment includes a first clamping ring 30 and a second clamping ring 31 correspondingly arranged at both ends of the ring frame 13, which are used to limit the axial movement of the iron core assembly 20 relative to the ring frame 13. The first clamping ring 30 is fixedly arranged on the outer peripheral wall of one end of the ring frame 13, and the first clamping ring 30 is used to press one end face of the iron core assembly 20. The first clamping ring 30 of this embodiment is preferably integrally formed with the ring frame 13, which is convenient for processing and assembly.

[0031] The second clamping ring 31 of this embodiment includes a retaining ring 311 and a connecting sleeve. The retaining ring 311 and the connecting sleeve make the cross-section of the second clamping ring 31 in an L shape. One end face of the retaining ring 311 is attached to the end face of the other end of the ring frame 13. The retaining ring 311 protrudes radially from the outer peripheral wall of the ring frame 13, and the part of the retaining ring 311 protruding from the outer peripheral wall of the ring frame 13 is used to press the other end face of the iron core assembly 20. The connecting sleeve is arranged inside the ring frame 13 and is threadedly connected with the ring frame 13. External threads are provided on the outer peripheral wall of the connecting sleeve, and corresponding internal threads are arranged on the inner peripheral wall of the ring frame 13 to facilitate the connection between the second clamping ring 31 and the ring frame 13.

[0032] In the rotor assembly of this embodiment, the first clamping ring 30 is integrally formed at one end of the ring frame 13, and threads are provided on the connecting sleeve of the second clamping ring 31 to connect with the ring frame 13. Compared with the traditional fixing method of the clamping ring assembly, multiple bolts required during assembly can be saved, the cost can be effectively reduced, and the assembly process can be simplified. Since the traditional clamping ring assembly is fixed to the ring frame 13 by bolts, a sufficient thickness needs to be reserved on the end face of the ring frame 13 to open threaded holes. After the bolts are omitted in the rotor assembly of this embodiment, the thickness of the ring frame 13 can be adaptively reduced, saving materials. Since the bolts connecting the clamping ring assembly and the core shaft 10 are omitted in the rotor assembly of this embodiment, no space needs to be reserved outside the clamping ring assembly to accommodate the bolt heads.

[0033] The helix direction of the external threads of the connecting sleeve of this embodiment is opposite to the rotation direction of the core shaft 10, so that the second clamping ring 31 is screwed into the frame in the direction opposite to the rotation of the core shaft 10. Since the rotor assembly usually rotates in one direction, the second clamping ring 31 meshes with the ring frame 13 through reverse external threads, which can effectively prevent the second clamping ring 31 from loosening during long-term rotation.

[0034] The first clamping ring 30 and the second clamping ring 31 of this embodiment correspondingly abut against the iron core pressing plates at both ends of the iron core assembly 20. Concave abutting steps 221 are provided on the iron core pressing plates to correspondingly connect the retaining rings 311 of the first clamping ring 30 and the second clamping ring 31. To facilitate the fitting and pressing of the first clamping ring 30 and the second clamping ring 31 on the iron core assembly 20, surface treatment can be performed at the contact position. Designing the abutting steps 221 can not only distinguish the treatment area but also facilitate assembly.

[0035] The outer peripheral wall of the second pressing ring 31 of this embodiment is provided with a tightening notch 313, and the tightening notch 313 is used for a tightening tool to apply torque so as to facilitate the screw connection between the second pressing ring 31 and the ring frame 13. Since the second pressing ring 31 needs to be controlled to rotate relative to the ring frame 13 during the screw connection process, the tightening notch 313 can provide a fulcrum to ensure that the tightening tool rotates the second pressing ring 31.

[0036] See Figure 2 and Figure 4 In this embodiment, a limiting groove 14 is further provided on the outer peripheral wall of the ring frame 13, and the limiting groove 14 axially penetrates the ring frame 13 and the first pressure ring 30; the core end plate 22 and the rotor punching 21 are provided with limiting protrusions 223 adapted to the limiting groove 14. During the assembly process, the protrusions on the core end plate 22 and the rotor punching 21 are inserted into the limiting groove 14, which can prevent the core end plate 22 and the rotor punching 21 from rotating in the circumferential direction relative to the ring frame 13, and ensure that the core assembly 20 is firmly installed.

[0037] The number of tightening notches 313 of this embodiment is preferably four, and the four tightening notches 313 are evenly arranged along the circumference to ensure the dynamic balance of the rotor assembly during the rotation process. The radial plate 12 of this embodiment is preferably provided with weight-reducing holes 121, which helps to achieve lightweight. The number of weight-reducing holes 121 is specifically two, and the two tightening weight-reducing holes 121 are evenly arranged along the circumference to ensure the dynamic balance of the rotor assembly during the rotation process. It should be noted that the number of tightening notches 313 and weight-reducing holes 121 can be set according to actual needs. The number of tightening notches 313 and weight-reducing holes 121 is preferably an even number and evenly arranged along the circumference to ensure the stability of the rotation process. The rotor assembly of this embodiment is applied to the motor, which can not only effectively reduce the cost of the motor, but also improve the assembly efficiency of the motor.

[0038] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A rotor assembly, characterized in that: include: A core shaft (10) which comprises, from inside to outside, a rotating shaft (11), a spoke plate (12) and a ring frame (13); An iron core assembly (20) is sleeved on the outer peripheral wall of the ring frame (13), and comprises rotor punchings (21) and iron core end plates (22), wherein the rotor punchings (21) are stacked in an axial direction, and the rotor punchings (21) are sandwiched between the iron core end plates (22); A magnetic steel (40) is embedded in the rotor punching sheet (21); A pressure ring assembly comprises a first pressure ring (30) and a second pressure ring (31) which are arranged at the two ends of the ring frame (13) respectively, wherein the first pressure ring (30) is fixed to the outer peripheral wall of one end of the ring frame (13) and is integrally formed with the ring frame (13); the second pressure ring (31) comprises a retaining ring (311) and a connecting sleeve, wherein the retaining ring (311) is fitted to the end surface of the other end of the ring frame (13) and protrudes from the outer peripheral wall of the ring frame (13), and the connecting sleeve is passed through the inner side of the ring frame (13) and is threadedly connected to the ring frame (13).

2. The rotor assembly according to claim 1, characterized in that: An external thread is arranged on the outer peripheral wall of the connecting sleeve, and a matching internal thread is arranged on the inner peripheral wall of the ring frame (13), and the rotation direction of the external thread is opposite to the rotation direction of the core shaft (10).

3. The rotor assembly according to claim 1 or 2, characterized in that: The outer peripheral wall of the retaining ring (311) is provided with a tightening groove (313).

4. The rotor assembly according to claim 3, characterized in that: The number of the tightening notches (313) is an even number, and the tightening notches (313) are evenly arranged along the circumferential direction.

5. The rotor assembly according to claim 1 or 2, characterized in that: The core end plate (22) is provided with an inwardly concave abutting step (221) for correspondingly abutting against the first pressure ring (30) and the retaining ring (311).

6. The rotor assembly according to claim 1 or 2, characterized in that: A limiting groove (14) is also provided on the outer peripheral wall of the ring frame (13), and the limiting groove (14) axially penetrates the ring frame (13) and the first pressure ring (30); and limiting protrusions (223) adapted to the limiting groove (14) are provided on the core end plate (22) and the rotor punching sheet (21).

7. The rotor assembly according to claim 1 or 2, characterized in that: The radial plate (12) is provided with a weight-reducing hole (121).

8. The rotor assembly according to claim 7, characterized in that: The number of the weight-reducing holes (121) is an even number, and the weight-reducing holes (121) are evenly arranged along the circumferential direction.

9. The rotor assembly according to claim 1 or 2, characterized in that: The rotating shaft (11), the spoke plate (12) and the ring frame (13) are integrally formed.

10. A motor, characterized in that: Comprising the rotor assembly according to any one of claims 1-9.

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