Rotor core manufacturing device of external rotor motor
In the process of manufacturing the rotor core of the outer rotor motor, the inner diameter of the blast material, the expansion sleeve and expansion core are used to expand the inner diameter of the blast material to form a complete circumferential core without welding joints, which solves the problems of insufficient strength of the winding iron core and incomplete inner circumferential surface, and achieves dual optimization of core strength and cost, ensuring uniformity of rotor air gap and improvement of performance.
Patent Information
- Application Number
- CN202420318650.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-21
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-02-21
AI Technical Summary
During the manufacturing process of the rotor core of the existing outer rotor motor, the strength of the wound core cannot be guaranteed and the inner circumference is incomplete, resulting in uneven rotor air gaps, resulting in problems of torque pulsation and abnormal vibration noise.
A rotor core manufacturing device for an outer rotor motor is adopted. By setting up a circular blast material and using the cooperation of the expansion sleeve and the expansion core, the inner diameter of the blast material is expanded to form a finished iron core. There are no welding points on the entire finished iron core, ensuring that the inner circumference is a complete circumference.
The structural strength guarantee of the finished iron core is achieved, material consumption and cost are reduced, the rotor magnetic steel is close to the inner circumference surface, and the rotor air gap is uniform, solving the problems of torque pulsation and abnormal vibration noise.
Smart Images
Figure CN222563668U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of rotor cores of outer rotor motors, and in particular relates to a rotor core manufacturing device for outer rotor motors. Background Art
[0002] The rotor core of the outer rotor direct drive motor is currently produced by most manufacturers in the following way: after the silicon steel strip is cut into a certain width, the silicon steel strip is spirally wound using a winding device, the tail is cut after winding several turns, and finally the tail is spot welded and fixed.
[0003] The above existing manufacturing method has the following disadvantages:
[0004] 1. The strength of the tail welding point of the wound iron core cannot be guaranteed, and it is easy to have loose pieces. Specifically: the strength of the tail welding point depends on the ambient temperature during processing, the accuracy of the winding tooling installation, and the stability of the welding power supply (voltage, frequency, pulse width, etc.).
[0005] 2. The wound core cannot fix the rotor magnets in the entire circumferential direction. Specifically: during the injection production of the rotor injection molding material, all the rotor magnets distributed in the circumferential direction need to be tightly attached to the inner circumferential surface of the rotor core. Due to the limitations of the winding core process itself, the inner circumference of the wound core cannot be a complete circle, which will cause several rotor magnets to be unable to fit tightly to the inner circumferential surface of the rotor core. Compared with the rotor magnets distributed in the circumferential direction at other angles, this type of rotor magnet will be farther away from the stator teeth, resulting in local unevenness in the stator-rotor air gap, which directly leads to prominent problems such as torque pulsation, abnormal vibration and noise.
[0006] 3. The selection of the number of turns of the wound core is wasteful. The specific reason is that the number of turns of the wound core should ultimately only depend on ensuring that the magnetic lines of force of the rotor magnet do not exceed the saturation upper limit. However, in the actual production process, the structural strength and welding processability of the wound core are comprehensively considered, and usually a number of additional turns are added, which increases the consumption of silicon steel raw materials and increases unnecessary costs. Utility Model Content
[0007] The utility model aims to solve the problems of the existing technology that the strength of the wound core cannot be guaranteed, the inner circumference is incomplete and the material cost is high, and proposes a rotor core manufacturing device for an outer rotor motor.
[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0009] A rotor core manufacturing device for an outer rotor motor, comprising:
[0010] A blank, wherein the blank is in a circular shape;
[0011] An expansion sleeve, wherein the blank is sleeved on the outside of the expansion sleeve, and the expansion sleeve comprises a plurality of petals arranged in a circular ring shape, and the side surfaces of the petals close to the inner peripheral surface of the blank cooperate to form a circular peripheral surface; and
[0012] An expansion core is provided, wherein the expansion core expands a plurality of petals from the inside to the outside.
[0013] Preferably, the inner wall surface of the expansion sleeve is provided with a first conical surface along one axial end thereof, and the outer peripheral surface of the expansion core is provided with a second conical surface matching the first conical surface.
[0014] Preferably, the first conical surface includes arc-shaped inclined surfaces whose number is equal to the petal blocks, and each of the arc-shaped inclined surfaces is respectively arranged on each petal block.
[0015] Preferably, the expansion core and the expansion sleeve are coaxially arranged.
[0016] Preferably, a stepped hole is provided at the center of the expansion core.
[0017] Preferably, a blanking piece is provided on the outer side of the expansion sleeve.
[0018] Preferably, the blanking piece is in a circular ring shape, and is sleeved on the outside of the expansion sleeve.
[0019] Preferably, the axial length of the outer peripheral surface of the expansion sleeve is greater than the axial length of the blank.
[0020] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0021] 1. In the utility model, by setting a billet in a circular shape, and then using the cooperation of an expansion sleeve and an expansion core, the inner diameter of the billet can be expanded to form a finished iron core. There is no welding point on the entire finished iron core, so the structural strength of the finished iron core is guaranteed, and there is no need to increase the thickness of the finished iron core, which reduces material consumption and material costs. At the same time, when each petal moves outward under the support of the expansion core, the inner circumference of the billet can be expanded in all directions, so that the inner circumference of the finished product after the billet is expanded is still a complete circumferential surface, ensuring that the rotor magnet can be tightly attached to the inner circumferential surface of the finished iron core, so that the rotor air gap is uniform, and the prominent problems such as torque pulsation and abnormal vibration and noise are solved.
[0022] 2. In the utility model, by providing the first conical surface and the second conical surface, the linear motion of the expanding core can be converted into the movement of the petal block in the radial direction of the expanding sleeve, thereby completing the diameter expansion of the blank, thereby simplifying the driving method of the expanding core, for example, driving the expanding core to perform linear motion by a cylinder, an oil cylinder, etc., which is conducive to reducing the actual cost.
[0023] 3. In the utility model, by providing a blanking piece, it is convenient to remove the finished iron core formed after the blank is expanded from the expansion sleeve. At the same time, by providing the blanking piece in a circular ring shape, the finished iron core can be fully pushed during blanking, effectively avoiding the finished iron core from being stuck due to uneven force. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 It is a schematic diagram of the overall front cross-sectional structure of a rotor core manufacturing device for an outer rotor motor proposed by the utility model;
[0025] Figure 2 This is a schematic structural diagram of a rotor core manufacturing device for an outer rotor motor proposed by the utility model, in which the expansion sleeve and the expansion core are separated;
[0026] Figure 3 It is a side view structural schematic diagram of a blank, an expansion sleeve and an expansion core of a rotor core manufacturing device for an outer rotor motor proposed by the utility model;
[0027] Figure 4 The utility model is a schematic structural diagram of a rotor core manufacturing device for an outer rotor motor in which a blanking piece is in a blanking state.
[0028] Legend: 1. Blank; 2. Expansion sleeve; 21. Petal block; 22. First conical surface; 221. Arc-shaped inclined surface; 3. Expansion core; 31. Second conical surface; 32. Step hole; 4. Blanking piece. DETAILED DESCRIPTION
[0029] The utility model is described below in conjunction with specific embodiments.
[0030] like Figures 1 to 4 As shown, the rotor core manufacturing device of the outer rotor motor of this embodiment includes a blank 1, an expansion sleeve 2 and an expansion core 3. Since the wound core used in the prior art has a series of technical problems, the blank 1 in the utility model is formed by cutting it from a seamless steel pipe using a cutter. The blank 1 is in a circular shape as a whole, but the inner diameter of the blank 1 cannot meet the requirements of the rotor core at this time. Therefore, it is necessary to use the expansion sleeve 2 and the expansion core 3 to expand the inner diameter of the blank 1 until the inner diameter of the blank 1 meets the size required by the actual rotor core.
[0031] The specific expansion method is as follows.
[0032] like Figures 1 to 3As shown, the blank 1 is sleeved on the outside of the expansion sleeve 2. Specifically, the expansion sleeve 2 includes a plurality of petals 21 arranged in a circular ring shape, and the side surfaces of each petal 21 close to the inner circumference of the blank 1 cooperate to form a circular circumference. The expansion core 3 is coaxially arranged with the expansion sleeve 2, and the expansion core 3 expands the plurality of petals 21 from the inside to the outside, so that when each petal 21 moves outward under the support of the expansion core 3, the inner circumference of the blank 1 can be expanded in all directions, so that the inner circumference of the finished product of the blank 1 after the diameter is expanded is still a complete circular surface, and the axial length of the outer circumference of the expansion sleeve 2 is greater than the axial length of the blank 1, so that the blank 1 can be fully expanded.
[0033] By setting a blank 1 in a circular shape, and then using the expansion sleeve 2 and the expansion core 3 to cooperate, the inner diameter of the blank 1 can be expanded to form a finished iron core. There are no welding spots on the entire finished iron core, thereby ensuring the structural strength of the finished iron core, and there is no need to increase the thickness of the finished iron core, thereby reducing material consumption and material costs. At the same time, as each petal block 21 moves outward under the support of the expansion core 3, the inner circumference of the blank 1 can be expanded in all directions, so that the inner circumference of the finished product after the diameter of the blank 1 is expanded is still a complete circular surface, ensuring that the rotor magnet can be tightly attached to the inner circumference of the finished iron core, making the rotor air gap uniform, and solving prominent problems such as torque pulsation and abnormal vibration and noise.
[0034] The specific structure of the expansion core 3 driving the expansion sleeve 2 to expand outward is as follows.
[0035] The petal block 21 in the utility model is slidably mounted on a vertical plane through a linear sliding pair, so that the petal block 21 can only move in the radial direction of the expansion sleeve 2. Then, in order to realize that the petal block 21 can automatically reset after moving outward, a reset spring can be fixedly connected to one end of the petal block 21 away from the axis of the expansion sleeve 2, and the end of the reset spring away from the petal block 21 is fixed on the vertical plane.
[0036] like Figure 2 As shown, the inner wall surface of the expansion sleeve 2 is provided with a first conical surface 22 at one end along its axial direction, and the outer peripheral surface of the expansion core 3 is provided with a second conical surface 31 matching the first conical surface 22. In actual use, the expansion core 3 can be inserted into the expansion sleeve 2 to the left along the axial direction of the expansion sleeve 2, so that the second conical surface 31 and the first conical surface 22 are close together, and then the expansion core 3 is continued to move left. At this time, the expansion sleeve 2 and the expansion core 3 are connected together through the conical inclined surface. Therefore, when the expansion core 3 moves to the left, a part of the force of the expansion core 3 on the expansion sleeve 2 will be converted into a driving force for driving the expansion sleeve 2 to expand outward. Since the expansion sleeve 2 is composed of a plurality of petals 21, each petal block 21 will gradually move outward in the radial direction of the expansion sleeve 2, thereby achieving the purpose of expanding the inner diameter of the blank 1. The first conical surface 22 includes arcuate inclined surfaces 221 equal in number to the petals 21, and each arcuate inclined surface 221 is respectively arranged on each petal block 21.
[0037] By providing the first conical surface 22 and the second conical surface 31, the linear motion of the expanding core 3 can be converted into the radial movement of the petal block 21 in the expanding sleeve 2, so as to complete the diameter expansion of the blank 1. Thus, the driving method of the expanding core 3 can be simplified, for example, the expanding core 3 can be driven to perform linear motion by a cylinder, an oil cylinder, etc., which is conducive to reducing the actual cost.
[0038] A stepped hole 32 is provided at the center of the expansion core 3, so as to facilitate installation of the expansion core 3 on a driving structure that drives the expansion core 3 to move.
[0039] like Figure 1 , Figure 2 and Figure 4 As shown, a blanking piece 4 is provided on the outside of the expansion sleeve 2. The blanking piece 4 can be a plurality of rods parallel to the axial direction of the expansion sleeve 2. The plurality of rods are arranged in a circular ring shape. In this embodiment, the blanking piece 4 is a circular ring shape, and the blanking piece 4 is sleeved on the outside of the expansion sleeve 2, so as to facilitate the removal of the finished iron core formed after the diameter expansion of the blank 1 from the expansion sleeve 2.
[0040] By providing the blanking piece 4, it is convenient to remove the finished iron core formed after the blank 1 is expanded from the expansion sleeve 2. At the same time, by providing the blanking piece 4 in a circular ring shape, the finished iron core can be fully pushed during blanking, effectively avoiding the finished iron core from being stuck due to uneven force.
[0041] The method of use of this embodiment is: use a cutter to cut and blank the seamless steel pipe, thereby obtaining a blank 1, and the inner diameter size of the blank 1 is set to D1;
[0042] Then, the blank 1 is clamped to the outside of the expansion sleeve 2, so that the blank 1 is sleeved on the expansion sleeve 2, and the outer diameter d of the expansion sleeve 2 is d=D1-(1-5) mm, where d is comprehensively considered according to the width and thickness of the specific blank 1;
[0043] Then, the expansion core 3 is driven to move to the left, and the first conical surface 22 and the second conical surface 31 are used to drive the plurality of petals 21 to expand outward along the radial direction of the expansion sleeve 2, so that the outer diameter of the expansion sleeve 2 is uniformly expanded from d to D2. Considering the elastic deformation of the blank 1 material, D2 is generally taken as D3+(2-10) mm, where D3 is the inner diameter of the finished iron core formed after the blank 1 is expanded.
[0044] The expansion core 3 maintains the expansion pressure for a certain period of time and then moves to the right to ensure that the inner diameter of the finished iron core is restored to the inner diameter of the blank 1 after the expansion core 3 is withdrawn from the expansion sleeve 2;
[0045] Then, the finished iron core after the expansion process is pushed out from the expansion sleeve 2 by the blanking piece 4 to complete the blanking. At this time, the inner diameter D3 of the finished iron core is the inner diameter size of the final rotor iron core.
Claims
1. A rotor core manufacturing device for an outer rotor motor, characterized in that: include: A blank (1), wherein the blank (1) is in a circular ring shape; An expansion sleeve (2), wherein the blank (1) is sleeved on the outside of the expansion sleeve (2), and the expansion sleeve (2) comprises a plurality of petals (21) arranged in a circular ring shape, and the side surfaces of the petals (21) close to the inner peripheral surface of the blank (1) cooperate to form a circular peripheral surface; as well as An expansion core (3), wherein the expansion core (3) expands a plurality of petals (21) from the inside to the outside.
2. The rotor core manufacturing device of an outer rotor motor according to claim 1, characterized in that: The inner wall surface of the expansion sleeve (2) is provided with a first conical surface (22) along one axial end thereof, and the outer peripheral surface of the expansion core (3) is provided with a second conical surface (31) matching the first conical surface (22).
3. The rotor core manufacturing device of an outer rotor motor according to claim 2, characterized in that: The first conical surface (22) comprises arc-shaped inclined surfaces (221) whose number is equal to the petal blocks (21), and each of the arc-shaped inclined surfaces (221) is respectively arranged on each petal block (21).
4. The rotor core manufacturing device of an outer rotor motor according to claim 1, characterized in that: The expansion core (3) and the expansion sleeve (2) are coaxially arranged.
5. The rotor core manufacturing device of an outer rotor motor according to claim 1, characterized in that: A stepped hole (32) is provided at the center of the expansion core (3).
6. The rotor core manufacturing device of an outer rotor motor according to claim 1, characterized in that: A blanking piece (4) is arranged on the outer side of the expansion sleeve (2).
7. The rotor core manufacturing device of an outer rotor motor according to claim 6, characterized in that: The blanking piece (4) is in the shape of a circular ring, and is sleeved on the outside of the expansion sleeve (2).
8. The rotor core manufacturing device of an outer rotor motor according to claim 1, characterized in that: The axial length of the outer peripheral surface of the expansion sleeve (2) is greater than the axial length of the blank (1).