Salient pole motor rotor and two-wheeled vehicle hub motor applying the same

Abstract

The utility model relates to a salient pole motor rotor and application two wheeled vehicle wheel hub motor of the rotor relates to two wheeled vehicle wheel hub motor field, including framework, coaxial installation on the magnetic separation layer of framework inner wall surface, the mutual inlaying between magnetic separation layer with framework inner wall surface, the annular surface is shaped with the framework inner wall surface, the area of magnetic separation layer is less than or equal to the area of annular surface and is greater than or equal to the outer circle surface area of rotor iron core. Replace the magnetic separation aluminum wheel used in traditional salient pole wheel hub electronic rotor with iron wheel and magnetic separation aluminum structure, make the wheel hub have higher strength stiffness, and do not influence the magnetic separation effect.

Description

Technical Field

[0001] This utility model relates to the field of hub motor technology, and in particular to a salient pole motor rotor and a two-wheel hub motor using the rotor. Background Technology

[0002] With the development of high-performance electric two-wheelers, the performance requirements for their core power source—the hub motor—are also increasing. Conventional hub motors are surface-mounted magnet hub motors. Once the power of such motors is determined, torque and speed can only be chosen as one of the two: high torque requires low speed, and vice versa. This is because the field weakening speed regulation range of such motors is low, and the speed is affected by the supply voltage, making it difficult to increase the speed further.

[0003] SPOKE salient-pole motors, due to their high salient-pole ratio, can achieve field weakening speed regulation in control, further increasing the motor speed to meet the high-speed operation requirements of electric two-wheelers. However, salient-pole motors have a complex structure and high manufacturing costs, making mass production difficult.

[0004] The SPOKE salient-pole hub motor rotor differs from that of a conventional hub motor. A conventional hub motor rotor consists of an iron hub and magnets bonded together, while the salient-pole hub motor rotor comprises magnets, an iron core block into which magnets can be embedded, and an aluminum wheel. The iron wheel is omitted because its magnetic leakage would negatively impact the performance of the salient-pole hub motor. Therefore, the rotor of a salient-pole hub motor accounts for a significant portion of its cost. This solution improves the rotor structure of the salient-pole hub motor, thereby reducing its cost and facilitating its adoption in electric two-wheeled vehicles. Utility Model Content

[0005] In response to the shortcomings of the existing production technology, the applicant provides a reasonably structured salient pole motor rotor and a two-wheel hub motor using the rotor. The magnetically shielding aluminum wheel used in the traditional salient pole hub electronic rotor is replaced with an iron wheel and a magnetically shielding aluminum structure, so that the hub has high strength and rigidity without affecting the magnetic shielding effect.

[0006] The technical solution adopted in this utility model is as follows: A salient pole motor rotor includes a frame and a magnetic shielding layer coaxially mounted on the inner wall of the frame, wherein the magnetic shielding layer and the inner wall of the frame are interlocked. The inner wall of the frame is formed with an annular surface, and the area of ​​the magnetic shielding layer is less than or equal to the area of ​​the annular surface and greater than or equal to the outer surface area of ​​the rotor core.

[0007] As a further improvement to the above technical solution: The annular surface is provided with textures, and the textures and the magnetic shielding layer generate frictional resistance to resist circumferential movement.

[0008] The texture consists of axially arranged concave and convex vertical lines.

[0009] The inner wall of the skeleton is formed with grooves, and the texture is located at the bottom of the grooves; the magnetic shielding layer abuts against the texture.

[0010] The outer circular wall of the magnetic shielding layer is provided with a protrusion, which is embedded in the groove.

[0011] The protrusions abut against the texture.

[0012] A circumferential fixing groove is provided on the annular surface, and the bottom of the circumferential fixing groove is steppedly engaged with the magnetic shielding layer for limiting.

[0013] The bottom circumferential array of the circumferential fixing groove is provided with radial fixing grooves, and the outer circular surface of the magnetic shielding layer is formed with protrusions, which are embedded in the radial fixing grooves for limiting.

[0014] The magnetic shielding layer and the circumferential fixing groove are mutually fitted and positioned.

[0015] A two-wheeled hub motor with a salient-pole motor rotor.

[0016] The beneficial effects of this utility model are as follows: This utility model adjusts the aluminum wheel structure in the rotor of a salient pole hub motor to a combination of an iron wheel and an aluminum alloy nested together. The purpose is to utilize the magnetic shielding properties of aluminum alloy to shield the magnets of the rotor of the salient pole hub motor, achieving the same effect as the aluminum wheel. Under the premise of achieving the same magnetic shielding effect, the solution of this application reduces production costs, helps to improve the market competitiveness of the product, and brings better economic benefits to the enterprise.

[0017] In this design, the motor hub is designed with a double-layer structure. The outer frame is made of iron, which preserves the rigidity and strength of the iron wheel. At the same time, the inner aluminum layer serves to shield the magnetic field, thus meeting the magnetic shielding design requirements of the salient pole motor.

[0018] This solution offers two types of inner and outer layer combination structures. The hot-pressed structure is easy to assemble and uses texture to increase the friction between the inner and outer layers, ensuring that the relative positional relationship between the inner and outer layers does not easily change. The concave-convex interlocking structure has a more stable fit and can be used without fasteners or additional steps such as high-frequency heating.

[0019] The finished product, which combines the inner and outer layers, consists of two concentric circles, ensuring uniform air gap and reliable quality for the hub motor. Attached Figure Description

[0020] Figure 1 This is the front view of the hub motor of this application.

[0021] Figure 2 This is a schematic diagram of the wheel hub frame structure in one embodiment of this application.

[0022] Figure 3 This is a schematic diagram of the combined structure of the wheel hub frame and the magnetic shielding layer in one embodiment of this application.

[0023] Figure 4 for Figure 3 The enlarged view of section A is used to illustrate the fit between the inner and outer layers.

[0024] Figure 5 This is a schematic diagram of the wheel hub frame structure in another embodiment of this application.

[0025] Figure 6 This is a schematic diagram of the combined structure of the wheel hub frame and the magnetic shielding layer in another embodiment of this application.

[0026] Figure 7 This is a partial sectional view of the hub motor of this application from the main view direction, used to illustrate the inner and outer layer structure mating relationship of another embodiment.

[0027] Figure 8 for Figure 7 The diagram is a color illustration, in which different colored outlines are used to clearly show the relative positional relationship between the wheel hub frame and the magnetic shielding layer.

[0028] The components include: 1. Stator assembly; 2. Rotor core; 3. Permanent magnet; 4. Frame; 5. Magnetic shielding layer; 401. Annular surface; 402. Texture; 403. Groove; 404. Circumferential fixing groove; 405. Radial fixing groove; 501. Protrusion; 502. Bump. Detailed Implementation

[0029] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0030] Example 1: like Figure 1 The image shown is a front view of the hub motor to which this application applies. A hub motor includes an internal stator assembly 1 and a rotor core 2 coaxially disposed around the stator assembly 1. Permanent magnets 3 are embedded in the rotor core 2. A hub is coaxially disposed around the outer ring of the rotor core 2.

[0031] As a supporting component, the wheel hub needs to provide a certain rigidity as a mounting base. In this solution, considering the need to provide support, magnetic shielding, and production costs, a combined structure of an outer iron frame 4 and an inner aluminum magnetic shielding layer 5 is adopted. This allows the wheel hub to have both the rigidity and strength of the iron frame 4, while the inner aluminum magnetic shielding layer 5 can effectively prevent magnetic leakage, thus meeting the motor design requirements.

[0032] like Figure 2 The diagram shows a structural schematic of an iron frame 4. The main body shape of the frame 4 can adopt a conventional wheel hub shape. The improvement in this embodiment is that there is an annular surface 401 on the inner wall of the frame 4, and a texture 402 is formed in the middle of this annular surface 401. The function of the texture 402 is to increase surface friction. Theoretically, any form of texture 402 can achieve this requirement, such as checkered patterns, stripes, knurling, etc. In this embodiment, considering ease of processing, raised vertical lines are selected as the texture 402 to increase frictional resistance.

[0033] The raised and recessed vertical grooves consist of several axially arranged raised strips spaced apart to form a friction surface. These axially arranged raised and recessed vertical grooves effectively prevent the circumferentially arranged magnetic shielding layer 5 from rotating in the circumferential direction. A groove 403 is formed on the inner wall of the frame 4, and the raised and recessed vertical grooves are located at the bottom of the groove.

[0034] like Figure 3 As shown, the magnetic shielding layer 5 is a ring-shaped aluminum component with smooth inner and outer walls. The magnetic shielding layer 5 is disposed on the inner wall of the frame 4. To facilitate the fastening of the magnetic shielding layer 5 to the frame 4 without the use of additional fasteners, this embodiment employs a thermoforming method for assembly.

[0035] During assembly, the frame 4 is heated at high frequency to expand its size, making it easier for the magnetic shielding layer 5 to be pressed into the groove 403 of the frame 4, so that the magnetic shielding layer 5 comes into contact with the vertical grooves. In this way, when the magnetic shielding layer 5 has a tendency to move around in the circumference, the frictional resistance between it and the vertical grooves can play a role in preventing the movement.

[0036] It should be noted that the area of ​​the magnetic shielding layer is less than or equal to the area of ​​the annular surface and greater than or equal to the outer circumferential surface area of ​​the rotor core. This design ensures that the magnetic shielding layer provides complete magnetic shielding while maximizing the contact area with the frame, with no portion extending beyond the frame, thereby improving connection reliability.

[0037] Example 2: like Figure 3 and Figure 4As shown, based on Embodiment 1, the outer wall of the magnetic shielding layer 5, that is, the side of the magnetic shielding layer 5 facing the vertical groove, has a protrusion 501 formed. The protrusion 501 is embedded in the groove 403. The main body of the magnetic shielding layer 5 is outside the groove 403 and abuts against the inner wall surface of the skeleton 4. The thickness of the magnetic shielding layer 5 can be used to compensate for the assembly gap.

[0038] As an alternative implementation, if assembly gap compensation is not required, the magnetic shielding layer 5 can be directly set as an annular part without protrusions 501, and during assembly, the entire magnetic shielding layer 5 is embedded in the groove 403.

[0039] Example 3: like Figure 5 The diagram shown is a schematic diagram of the skeleton 4 structure in this embodiment. A circumferential fixing groove 404 is formed on the inner wall of the skeleton 4, and a plurality of radial fixing grooves 405 are formed in a circular array at the bottom of the circumferential fixing groove 404.

[0040] Reference Figure 6 , Figure 7 , Figure 8 A protrusion 502 is provided on the outer wall of the magnetic shielding layer 5, and the protrusion 502 fits perfectly into the radial fixing groove 405.

[0041] As an alternative implementation, the radial fixing groove 405 can also adopt a radial protrusion structure, with a recess provided on the outer wall of the magnetic shielding layer 5 to accommodate the radial protrusion structure, which can also play a role in limiting the concave-convex fit.

[0042] During assembly, the radial fixing groove 405 and the circumferential fixing groove 404 mate with the protrusion 502. The radial fixing groove 405 and the circumferential fixing groove 404 together form a multi-directional limiting structure, which firmly connects the frame 4 and the magnetic shielding layer 5 through mechanical interlocking, eliminating the need for additional fasteners and improving assembly efficiency and structural reliability. The uniform annular arrangement design ensures even stress distribution, which helps improve the dynamic balance and durability of the overall structure, making it suitable for rotating parts subjected to complex loads.

[0043] As an alternative assembly method, casting can also be used. The iron frame 4 is placed in an aluminum alloy low-pressure casting mold, and an aluminum alloy ring is cast inside the frame 4 using low-pressure casting. During casting, molten aluminum alloy flows into the radial fixing groove 405 and the circumferential fixing groove 404 of the frame 4, making the aluminum alloy ring less likely to fall off after forming.

[0044] Finally, the entire inner surface of the product is machined to ensure that all inner circular surfaces are concentric, thus guaranteeing uniform air gap in the hub motor and ensuring product quality.

[0045] Example 4: As a supplementary material selection scheme for Embodiment 1 and Embodiment 2, the skeleton 4, as a component with certain rigidity and magnetic conductivity, can be made of materials such as metallic iron, silicon iron alloy, and soft magnetic ferrite. The magnetic shielding layer 5 can be made of materials such as aluminum alloy, copper alloy, and titanium alloy. Among them, aluminum alloy has the advantage of being lightweight, so it is the preferred material.

[0046] The main advantage of this invention lies in that it significantly reduces the use of aluminum while achieving the same magnetic shielding effect. Aluminum is only used as the magnetic shielding layer 5 where magnetic shielding is required, effectively controlling production costs. Furthermore, based on the concept of an iron-aluminum composite structure, this invention provides a structure to prevent cross-contamination between the two components, ensuring that the user experience of the iron-aluminum composite structure is no less than that of a pure aluminum structure.

[0047] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A salient-pole motor rotor, characterized in that: It includes a frame (4) and a magnetic shielding layer (5) coaxially mounted on the inner wall of the frame (4), wherein the magnetic shielding layer (5) and the inner wall of the frame (4) are interlocked. The inner wall of the frame (4) is formed with an annular surface (401), and the area of ​​the magnetic shielding layer (5) is less than or equal to the area of ​​the annular surface (401) and greater than or equal to the outer surface area of ​​the rotor core (2).

2. The salient-pole motor rotor as described in claim 1, characterized in that: The annular surface (401) is provided with texture (402), and the texture (402) and the magnetic shielding layer (5) generate frictional resistance to resist circumferential movement.

3. The salient-pole motor rotor as described in claim 2, characterized in that: The texture (402) is an axially arranged concave-convex vertical texture.

4. The salient-pole motor rotor as described in claim 2, characterized in that: The inner wall surface of the skeleton (4) is formed with a groove (403), and the texture (402) is located at the bottom of the groove (403); the magnetic shielding layer (5) abuts against the texture (402).

5. The salient-pole motor rotor as described in claim 4, characterized in that: The outer circular wall surface of the magnetic shielding layer (5) is provided with a protrusion (501), which is embedded in the groove (403).

6. The salient-pole motor rotor as described in claim 5, characterized in that: The protrusion (501) abuts against the texture (402).

7. The salient-pole motor rotor as described in claim 1, characterized in that: A circumferential fixing groove (404) is provided on the annular surface (401), and the bottom of the circumferential fixing groove (404) is steppedly matched with the magnetic shielding layer (5) for limiting.

8. The salient-pole motor rotor as described in claim 7, characterized in that: The bottom circumferential array of the circumferential fixing groove (404) is provided with radial fixing grooves (405), and the outer circular surface of the magnetic shielding layer (5) is formed with protrusions (502), which are embedded in the radial fixing grooves (405) for positioning.

9. The salient-pole motor rotor as described in claim 8, characterized in that: The magnetic shielding layer (5) and the circumferential fixing groove (404) are mutually fitted and limited.

10. A two-wheeled hub motor, characterized in that, It has a salient pole motor rotor as described in any one of claims 1-9.

Images