Mandrel, rotor assembly and motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a mandrel, a rotor assembly and a motor, the mandrel comprises a rotating shaft, an annular radial plate and a cylindrical ring frame; the rotating shaft and the radial plate are integrally formed, and the inner circumferential wall of the ring frame comprises a first inner circumferential wall and a second inner circumferential wall which are sequentially arranged in the axial direction; the first inner circumferential wall extends inwards from one end of the annular frame, and the size of the inner diameter of the first inner circumferential wall is smaller than the size of the outer diameter of the radial plate. The size of the inner diameter of the second inner peripheral wall is matched with the size of the outer diameter of the radial plate. One end face of the radial plate abuts against the transition face of the first inner circumferential wall and the second inner circumferential wall, and the radial plate is connected with the ring frame in a welded mode. By the adoption of the mandrel, the mandrel can be made of different materials, the situation that the whole mandrel is made of expensive materials is avoided, the production cost can be reduced under the condition that the structural strength of the mandrel is guaranteed through the connection mode of the annular frames and the radial plates, and light weight can be achieved easily.

Description

Technical Field

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

[0002] The rotor assembly is one of the important parts of the motor, which includes a core shaft, an iron core assembly arranged on the core shaft, and a magnet arranged on the iron core assembly. Some existing core shafts include a rotating shaft, an annular spoke plate, and a cylindrical ring frame, and the iron core assembly is arranged on the ring frame. The core shaft is usually made of the same material and forged as a whole, which has the problems of high production cost and great manufacturing difficulty. Utility Model Content

[0003] In order to improve the problem of high production cost of the existing mandrel, the utility model provides a mandrel, a rotor assembly and a motor. The mandrel is a split structure, so that different parts of the mandrel can be made of different materials, thereby reducing production costs.

[0004] According to an embodiment of the utility model, a first aspect provides a core shaft, comprising a rotating shaft, an annular spoke plate and a cylindrical ring frame;

[0005] The rotating shaft and the spoke plate are integrally formed, and the inner peripheral wall of the ring frame includes a first inner peripheral wall and a second inner peripheral wall sequentially arranged along the axial direction; the first inner peripheral wall extends inward from one end of the ring frame, and the inner diameter of the first inner peripheral wall is smaller than the outer diameter of the spoke plate; the inner diameter of the second inner peripheral wall is adapted to the outer diameter of the spoke plate;

[0006] One end surface of the spoke plate abuts against a transition surface between the first inner peripheral wall and the second inner peripheral wall, and the spoke plate is connected to the ring frame by welding.

[0007] In some embodiments, the inner circumferential wall of the ring frame further includes a third inner circumferential wall, which is adjacent to the second inner circumferential wall and extends to the other end of the ring frame, and the inner diameter of the third inner circumferential wall is greater than the outer diameter of the spoke plate.

[0008] In some embodiments, a limiting protrusion is further provided on the outer peripheral wall of the ring frame, and the limiting protrusion is located at the end of the ring frame away from the first inner peripheral wall.

[0009] In some embodiments, a threaded hole is formed on the end surface of the ring frame close to the first inner peripheral wall.

[0010] In some embodiments, a limiting groove is further provided on the outer peripheral wall of the ring frame, and the limiting groove axially penetrates the ring frame and the limiting protrusion.

[0011] In some embodiments, the material of the rotating shaft and the spoke plate is 20CrMnTiH, and the material of the ring frame is 20# steel.

[0012] In some embodiments, the spoke plate is connected to the ring frame by laser welding.

[0013] In some embodiments, weight-reducing holes are provided on the spoke plate.

[0014] A rotor assembly comprises an iron core component, a magnetic steel arranged on the iron core component and the aforementioned core shaft, wherein the iron core component is arranged on the outer peripheral wall of the ring frame.

[0015] A motor comprises the above-mentioned rotor assembly.

[0016] The core shaft of the utility model can be made of different materials to avoid the entire core shaft being made of relatively expensive materials. The connection method between the ring frame and the spoke plate can reduce the production cost while ensuring the structural strength of the core shaft and help achieve lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic cross-sectional structure diagram of the rotor assembly of this embodiment;

[0018] Figure 2 is a schematic structural diagram of the mandrel of this embodiment;

[0019] Figure 3 Schematic diagram of the structure of the ring frame of this embodiment.

[0020] In the figure: shaft 10; spline 11; spoke plate 20; weight-reducing hole 21; ring frame 30; first inner peripheral wall 31; second inner peripheral wall 32; third inner peripheral wall 33; limiting protrusion 34; limiting groove 35; rotor punching 40; core end plate 41; magnetic steel 50; pressure ring 60; rotary transformer 70. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is described in detail in some embodiments in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0023] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides a rotor assembly, including a core shaft, an iron core assembly arranged on the core shaft, and a magnetic steel 50 arranged on the iron core assembly. The core shaft of this embodiment is a split structure, and the core shaft includes a rotating shaft 10, an annular spoke plate 20, and a cylindrical ring frame 30 from the inside to the outside, wherein the rotating shaft 10 and the spoke plate 20 are integrally formed, the inner peripheral wall of the ring frame 30 is fixedly connected to the outer peripheral wall of the spoke plate 20, the iron core is arranged on the outer peripheral wall of the ring frame 30, and the magnetic steel 50 is embedded in the iron core.

[0025] This embodiment adopts a split mandrel, so that the mandrel can be made of different materials. For example, the material of the rotating shaft 10 and the spoke plate 20 is preferably 20CrMnTiH, and the ring frame 30 is preferably 20# steel or other low-carbon alloy steel, so as to avoid the entire mandrel being made of more expensive materials. This split mandrel can reduce production costs while ensuring structural strength, and helps to achieve lightweight. It should be noted that the material of the rotating shaft 10 and the spoke plate 20 and the material of the ring frame 30 can be selected from other existing materials according to needs, and this embodiment will not be repeated.

[0026] In the process of machining the mandrel, the main bearing positions of the integrally formed rotating shaft 10 and the spoke plate 20 can adopt a carbon-nitrogen quenching heat treatment process, and the ring frame 30 can adopt a quenching and tempering heat treatment process, so that the mandrel can reduce the amount of parts processing, shorten the processing cycle, reduce the design workload and mold development, reduce costs, and have good economic benefits while meeting the performance of the whole machine.

[0027] In this embodiment, a rotary transformer 70 is provided at one end of the rotating shaft 10 for transmitting signals; a spline 11 is formed at the other end of the rotating shaft 10 for connecting a transmission mechanism. The spoke plate 20 of this embodiment is arranged at a middle position along the axial direction of the rotating shaft 10, and a weight-reducing hole 21 is preferably provided on the spoke plate 20 to help achieve lightweight.

[0028] like Figure 3As shown, the inner circumferential wall of the ring frame 30 includes a first inner circumferential wall 31 and a second inner circumferential wall 32 arranged in sequence along the axial direction, so that the inner circumferential wall of the ring frame 30 forms a step-like structure. The first inner circumferential wall 31 extends from one end of the ring frame 30 to the inside of the ring frame 30, the inner diameter of the first inner circumferential wall 31 is smaller than the outer diameter of the spoke 20, and the inner diameter of the second inner circumferential wall 32 is adapted to the outer diameter of the spoke 20, so that the first inner circumferential wall 31 and the second inner circumferential wall 32 form a step. One end face of the spoke 20 abuts against the transition surface between the first inner circumferential wall 31 and the second inner circumferential wall 32, and the spoke 20 and the ring frame 30 are welded to ensure that the spoke 20 and the ring frame 30 are firmly fixed. The welding method of this embodiment is preferably laser welding, which can ensure the welding quality.

[0029] Since the second inner peripheral wall 32 is adapted to the spoke plate 20, the processing requirements for the second inner peripheral wall 32 are relatively high. If the second inner peripheral wall 32 extends to the other end of the ring frame 30, it will not only increase the processing difficulty, but also make it difficult for the spoke plate 20 to move to the abutting position, thereby increasing the assembly difficulty. To this end, the inner peripheral wall of the ring frame 30 of the present embodiment also includes a third inner peripheral wall 33, which is adjacent to the second inner peripheral wall 32 and extends to the other end of the ring frame 30. The inner diameter of the third inner peripheral wall 33 is larger than the outer diameter of the spoke plate 20. The third inner peripheral wall 33 not only reduces the processing area of ​​the second inner peripheral wall 32 and reduces the processing difficulty, but also can easily move the spoke plate 20 to the abutting position, which is convenient for assembly. It should be noted that the inner diameter of the third inner peripheral wall 33 of the present embodiment is larger than the outer diameter of the spoke plate 20, and the inner diameter of the third inner peripheral wall 33 can be consistent, so that the first inner peripheral wall 31, the second inner peripheral wall 32 and the third inner peripheral wall 33 form a two-stage step. In some embodiments, the third inner circumferential wall 33 may be independently formed into a stepped structure as required, so that the first inner circumferential wall 31 , the second inner circumferential wall 32 and the third inner circumferential wall 33 form three steps, four steps, etc.

[0030] The core assembly of this embodiment includes a plurality of rotor punchings 40 stacked in the axial direction and a core end plate 41 for clamping the rotor punchings 40. The magnetic steel 50 of this embodiment is embedded in the rotor punchings 40. It should be noted that the structure and connection method of the core assembly and the magnetic steel 50 of this embodiment are all prior arts and will not be described in detail here.

[0031] The outer peripheral wall of the ring frame 30 of this embodiment is further provided with a limiting protrusion 34, and the limiting protrusion 34 is located at the end away from the first inner peripheral wall 31. A threaded hole is provided on the end surface of the ring frame 30 away from the limiting protrusion 34, and a pressure ring 60 is attached to the end surface with the threaded hole, and a bolt is passed through the pressure ring 60 and screwed into the threaded hole to fix the pressure ring 60 to the ring frame 30. The pressure ring 60 can cooperate with the limiting protrusion 34 to limit the core end plate 41 to ensure that the core assembly is firmly installed.

[0032] In this embodiment, the limiting protrusion 34 is arranged at the end away from the first inner peripheral wall 31, so that the ring frame 30 has a threaded hole on the end surface close to the first inner peripheral wall 31. Since the inner diameter of the first inner peripheral wall 31 is small, this part of the ring frame 30 has a sufficient thickness to open the threaded hole, which can ensure the structural strength of the ring frame 30. It should be noted that the first inner peripheral wall 31 can be arranged close to any end of the ring frame 30 according to needs, and the limiting protrusion 34 is arranged at the other end of the ring frame 30.

[0033] The outer peripheral wall of the ring frame 30 of this embodiment is also provided with a limiting groove 35, which axially penetrates the ring frame 30 and the limiting protrusion 34; the core end plate 41 and the rotor punching 40 are provided with a convex block adapted to the limiting groove 35. During the assembly process, the convex blocks on the core end plate 41 and the rotor punching 40 are inserted into the limiting groove 35, which can prevent the core end plate 41 and the rotor punching 40 from rotating circumferentially relative to the ring frame 30, ensuring that the core assembly is firmly installed. Applying the rotor assembly of this embodiment to the motor can not only effectively reduce the cost of the motor, but also help to make the motor lighter.

[0034] 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.

[0035] 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 utility model 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 core shaft, comprising a rotating shaft (10), an annular spoke plate (20) and a cylindrical ring frame (30); Features: The rotating shaft (10) and the spoke plate (20) are integrally formed, and the inner peripheral wall of the ring frame (30) comprises a first inner peripheral wall (31) and a second inner peripheral wall (32) which are sequentially arranged along the axial direction; the first inner peripheral wall (31) extends inward from one end of the ring frame (30), and the inner diameter of the first inner peripheral wall (31) is smaller than the outer diameter of the spoke plate (20); the inner diameter of the second inner peripheral wall (32) is adapted to the outer diameter of the spoke plate (20); One end surface of the radial plate (20) abuts against a transition surface between the first inner peripheral wall (31) and the second inner peripheral wall (32), and the radial plate (20) is connected to the ring frame (30) by welding.

2. The mandrel according to claim 1, Features: The inner peripheral wall of the ring frame (30) further comprises a third inner peripheral wall (33), the third inner peripheral wall (33) being arranged adjacent to the second inner peripheral wall (32) and extending to the other end of the ring frame (30), the inner diameter of the third inner peripheral wall (33) being greater than the outer diameter of the spoke plate (20).

3. The mandrel according to claim 2, Features: A limiting protrusion (34) is also provided on the outer peripheral wall of the ring frame (30), and the limiting protrusion (34) is located at the end of the ring frame (30) away from the first inner peripheral wall (31).

4. The mandrel according to claim 3, Features: The ring frame (30) is provided with a threaded hole on an end surface close to the first inner peripheral wall (31).

5. The mandrel according to claim 3, Features: A limiting groove (35) is also provided on the outer peripheral wall of the ring frame (30), and the limiting groove (35) axially penetrates the ring frame (30) and the limiting protrusion (34).

6. The mandrel according to any one of claims 1 to 5, Features: The material of the rotating shaft (10) and the spoke plate (20) is 20CrMnTiH, and the material of the ring frame (30) is 20# steel.

7. The mandrel according to any one of claims 1 to 5, Features: The spoke plate (20) is connected to the ring frame (30) by laser welding.

8. The mandrel according to any one of claims 1 to 5, Features: The spoke plate (20) is provided with a weight-reducing hole (21).

9. A rotor assembly, Features: It comprises an iron core assembly, a magnetic steel (50) arranged on the iron core assembly, and a core shaft according to any one of claims 1 to 8, wherein the iron core assembly is arranged on the outer peripheral wall of the ring frame (30).

10. A motor, Features: Includes the rotor assembly as described in claim 9.

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