Hub motor outer rotor topological structure, electric bicycle and electric motorcycle

Abstract

The invention discloses a hub motor outer rotor topological structure, an electric bicycle and an electric motorcycle, and relates to the technical field of motors, the hub motor outer rotor topological structure comprises a body which is arranged in an annular shape, and the inner side of the body is concavely provided with a plurality of accommodating grooves along the diameter direction for accommodating magnetic blocks; the plurality of accommodating grooves are sequentially and uniformly distributed at intervals along the peripheral side of the body; a magnetic isolation bridge is arranged between every two of the multiple containing grooves, and the motor has salient polarity and is suitable for high-frequency injection algorithm control driving. According to the technical scheme of the invention, the plurality of accommodating grooves are concavely formed in the inner side of the body along the diameter direction and are used for accommodating the magnetic blocks, and the plurality of accommodating grooves are sequentially and uniformly distributed at intervals along the peripheral side of the body, so that the magnetic blocks are tightly attached to the inner wall of the rotor iron core; a magnetic isolation bridge is arranged between every two of the multiple containing grooves, and the motor has salient polarity and is suitable for high-frequency injection algorithm control driving, so that the problems that Hall elements are prone to being damaged and frequently replaced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly to an outer rotor topology structure of a hub motor, an electric bicycle, and an electric motorcycle. Background Art

[0002] Currently, in the industry, the rotors of electric bicycle hub motors all adopt an outer rotor surface-mounted structure, that is, the outer rotor is an iron core ring, and sintered neodymium iron boron magnets are sequentially attached to the inner ring wall. The magnets are rectangular in shape. This will cause the magnets not to fit tightly with the inner wall of the rotor core, which will affect the air gap of the motor and result in an uneven air gap of the motor. In addition, the control position of this kind of hub motor is through Hall induction position. Hall is an electronic component and is easily damaged, resulting in a high repair rate of this surface-mounted hub motor. Summary of the Invention

[0003] The main object of the present invention is to propose an outer rotor topology structure of a hub motor, an electric bicycle, and an electric motorcycle, aiming to provide an outer rotor topology structure of a hub motor, an electric bicycle, and an electric motorcycle that is not easily damaged by Hall elements.

[0004] To achieve the above object, the outer rotor topology structure of the hub motor proposed by the present invention includes a body, which is arranged in a ring shape, and a plurality of accommodation grooves are recessed along the diameter direction on the inner side for accommodating magnetic blocks; the plurality of accommodation grooves are sequentially and evenly spaced along the circumferential side of the body;

[0005] Among them, a magnetic isolation bridge is spaced between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm.

[0006] In an embodiment, the motor has an air gap, and among them, the magnetic block is directly communicated with the air gap.

[0007] In an embodiment, both sides of the magnetic isolation bridge are arranged at an angle with its center line to form a limiting surface for clamping the magnetic block.

[0008] In an embodiment, the magnetic isolation bridge and the magnetic block have different magnetic permeabilities, so that the inductances of the D-axis and Q-axis of the motor are different.

[0009] In an embodiment, the salient pole ratio of the motor is 1.4 - 1.6.

[0010] In an embodiment, the material of the magnetic block is sintered neodymium iron boron magnet.

[0011] The present invention also proposes an electric bicycle, which includes the outer rotor topology structure of the hub motor as described in any one of the above.

[0012] Among them, the outer rotor topological structure of the in-wheel motor includes a body, which is arranged in a ring shape, and a plurality of accommodation grooves are recessed along the diameter direction on the inner side for accommodating magnetic blocks; the plurality of accommodation grooves are arranged at equal intervals in sequence along the circumferential side of the body;

[0013] Among them, there is a magnetic isolation bridge between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm.

[0014] The present invention also provides an electric motorcycle, which includes the outer rotor topological structure of the in-wheel motor as described in any one of the above;

[0015] Among them, the outer rotor topological structure of the in-wheel motor includes a body, which is arranged in a ring shape, and a plurality of accommodation grooves are recessed along the diameter direction on the inner side for accommodating magnetic blocks; the plurality of accommodation grooves are arranged at equal intervals in sequence along the circumferential side of the body;

[0016] Among them, there is a magnetic isolation bridge between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm.

[0017] The technical solution of the present invention is to adopt a plurality of the accommodation grooves recessed along the diameter direction on the inner side of the body for accommodating the magnetic blocks, and the plurality of accommodation grooves are arranged at equal intervals in sequence along the circumferential side of the body, so that the magnetic blocks are closely attached to the inner wall of the rotor core. At the same time, there is a magnetic isolation bridge between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm, thereby solving the problems of easy damage and frequent replacement of Hall elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the outer rotor topological structure of the in-wheel motor provided by the present invention;

[0020] Figure 2 For Figure 1 the partial enlarged view at A in

[0021] Figure 3 It is a schematic structural diagram of another embodiment of the outer rotor topological structure of the in-wheel motor provided by the present invention;

[0022] Figure 4 For Figure 3 the partial enlarged view at B in

[0023] Explanation of the reference numerals in the drawings:

[0024] 100, outer rotor topology of the in-wheel motor; 1, body; 11, accommodation groove; 12, magnetic isolation bridge, 121, limiting surface;

[0025] 201, magnetic block; 202, air gap.

[0026] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, if there are descriptions such as "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes the A solution, or the B solution, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0030] At present, in the industry, the rotors of hub motors for electric bicycles all adopt an outer rotor surface-mounted structure, that is, the outer rotor is an iron core ring, and sintered neodymium iron boron magnets are sequentially attached to the inner ring wall. The shape of the magnets is rectangular, which will cause the magnets not to fit tightly with the inner wall of the rotor core, affecting the air gap of the motor and resulting in an uneven air gap of the motor. In addition, the position of this hub motor is controlled by Hall induction. Hall is an electronic component and is easily damaged, resulting in a high repair rate of this surface-mounted hub motor.

[0031] To solve the above problems, the present invention proposes a hub motor outer rotor topology structure, an electric bicycle, and an electric motorcycle, aiming to provide a hub motor outer rotor topology structure, an electric bicycle, and an electric motorcycle that are not easily damaged by Hall elements. Figures 1 to 4 It is a schematic structural diagram of an embodiment provided by the hub motor outer rotor topology structure of the present invention.

[0032] Please refer to Figures 1 to 2 , in an embodiment of the present invention, the hub motor outer rotor topology structure includes a body, which is arranged in a ring shape, and a plurality of accommodation grooves are recessed along the diameter direction on the inner side for accommodating magnetic blocks; the plurality of accommodation grooves are sequentially and evenly spaced along the circumferential side of the body; wherein, a magnetic isolation bridge is spaced between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm.

[0033] The technical solution of the present invention is to adopt a plurality of the accommodation grooves recessed along the diameter direction on the inner side of the body for accommodating the magnetic blocks, and the plurality of accommodation grooves are sequentially and evenly spaced along the circumferential side of the body. In this way, the magnetic blocks are tightly attached to the inner wall of the rotor core. At the same time, a magnetic isolation bridge is spaced between every two of the plurality of accommodation grooves, and the motor has salient polarity and is suitable for being controlled and driven by a high-frequency injection algorithm, thereby solving the problems of easy damage and frequent replacement of Hall elements.

[0034] In addition, please refer to Figure 3 and Figure 4 , the motor has an air gap, wherein the magnetic block is directly communicated with the air gap. It can be understood that in some embodiments, since the magnetic block is inserted along the length direction of the body, that is, the accommodation groove is closed, which further leads to the magnetic block not being communicated with the air gap, greatly increasing the magnetic leakage phenomenon, that is, the magnetic flux is reduced, thus further reducing the motor torque and the overall performance of the motor. Therefore, in another embodiment, the motor has an air gap, wherein the magnetic block is directly communicated with the air gap, that is, the accommodation groove is set to be semi-open, so that the magnetic block is communicated with the air gap, thereby increasing the magnetic flux, that is, reducing the magnetic leakage phenomenon of the motor and improving the motor torque and the overall performance of the motor.

[0035] In addition, please refer to Figure 2, both sides of the magnetic isolation bridge are arranged at an angle with its center line to form a limiting surface for clamping the magnetic block. It can be understood that the body belongs to the rotor and will perform high-speed rotational motion. In some embodiments, the magnetic block is fixed on the inner side wall of the body by gluing. However, when the body rotates at a high speed, due to the action of the tangential force, the magnetic block is extremely likely to fall off from the inner side wall of the body, thereby affecting the reliability of the motor. Therefore, in another embodiment, both sides of the magnetic isolation bridge are arranged at an angle with its center line to form the limiting surface for clamping the magnetic block. Through the setting of the limiting surface, the magnetic block is clamped on the inner side wall of the body by physical means. Furthermore, when the body rotates at a high speed, the magnetic block is not likely to fall off from the body, thereby further improving the reliability of the motor during use.

[0036] In addition, the magnetic isolation bridge and the magnetic block have different magnetic permeabilities, so that the inductances of the D-axis and Q-axis of the motor are different. It can be understood that in this embodiment, by adopting a plurality of the accommodating grooves recessed along the diameter direction on the inner side of the body for accommodating the magnetic blocks, the plurality of accommodating grooves are arranged at equal intervals in sequence along the circumferential side of the body. In this way, the magnetic blocks are closely attached to the inner wall of the rotor core. At the same time, there is a magnetic isolation bridge between every two of the plurality of accommodating grooves, and the motor has salient poles and is suitable for high-frequency injection algorithm control drive. Furthermore, the problem of easy damage and frequent replacement of Hall elements is solved. The salient poles of the motor are precisely because the magnetic isolation bridge and the magnetic block have different magnetic permeabilities, so that the inductances of the D-axis and Q-axis of the motor are different, thereby making the motor generate salient poles. The salient poles of the motor are beneficial to high-frequency injection algorithm control drive, and further solve the problem of easy damage and frequent replacement of Hall elements.

[0037] Furthermore, the salient pole ratio of the motor is 1.4 - 1.6. It can be understood that in this embodiment, the salient pole ratio of the motor is between 1.4 and 1.6, and in the preferred embodiment, it is 1.5. It can be understood that the salient pole ratio of the motor refers to the distance ratio between the magnetic block and the motor salient pole, which is an important parameter in the motor design. The size of the salient pole ratio of the motor has an important impact on the performance of the motor. The larger the salient pole ratio of the motor, the greater the distance between the magnetic block and the motor salient pole. Therefore, the action range of the magnetic field is larger, and the torque of the motor is larger. However, as the salient pole ratio increases, the air gap between the magnetic block and the motor salient pole will also increase, resulting in an increase in the magnetic resistance of the magnetic circuit of the motor, a decrease in the magnetic flux density, and a reduction in the uniformity and stability of the magnetic field, affecting the efficiency and stability of the motor. Therefore, in this embodiment, through multiple experimental verifications, it is appropriate that the salient pole ratio of the motor is 1.4 - 1.6, and in the preferred embodiment, the salient pole ratio of the motor is 1.5.

[0038] In addition, the magnetic block is made of sintered neodymium iron boron magnet. It can be understood that the sintered neodymium iron boron magnet has the following advantages:

[0039] 1. High magnetic energy product: The magnetic energy product of the neodymium iron boron magnet is the highest among permanent magnetic materials at present, which can provide extremely strong magnetic force and is suitable for occasions with high magnetic field requirements.

[0040] 2. High coercivity: It has high coercivity and strong demagnetization resistance ability, and is suitable for use in complex environments.

[0041] 3. High energy density: It has high energy density, small volume but strong magnetic force, and is suitable for applications with limited space.

[0042] 4. Good temperature stability: By adjusting the composition and process, stable magnetic properties can be maintained at relatively high temperatures.

[0043] 5. Excellent mechanical properties: After sintering treatment, it has relatively high hardness and strength and can withstand a certain amount of mechanical stress.

[0044] 6. Diverse shapes and sizes: It can be made into various shapes and sizes through different processing methods to meet different requirements.

[0045] 7. High cost performance: Although the raw material cost is relatively high, its excellent performance and wide applications make it have high cost performance.

[0046] 8. Easy to process and coat: Although it has high hardness, it can be processed through specific processes, and the surface can be coated to enhance corrosion resistance.

[0047] 9. Environmentally friendly material: The neodymium iron boron material can be recycled and reused, meeting environmental protection requirements.

[0048] Thus, selecting the sintered neodymium iron boron magnet as the material of the magnetic block of the motor also endows the motor with the above advantages.

[0049] The present invention also provides an electric bicycle, which includes the hub motor outer rotor topological structure. The specific structure of the hub motor outer rotor topological structure refers to the above embodiments. Since the electric bicycle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0050] The present invention also provides an electric motorcycle, which includes the hub motor outer rotor topological structure. The specific structure of the hub motor outer rotor topological structure refers to the above embodiments. Since the electric motorcycle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0051] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. An outer rotor topological structure of a wheel hub motor, characterized in that It includes a body, which is arranged in a ring shape. A plurality of accommodating grooves are recessed along the diameter direction on the inner side for accommodating magnetic blocks; the plurality of accommodating grooves are arranged at equal intervals in sequence along the circumferential side of the body; Among them, there is a magnetic isolation bridge spaced between every two of the plurality of accommodating grooves, and the motor has salient poles and is suitable for being controlled and driven by a high-frequency injection algorithm.

2. The hub motor outer rotor topology according to claim 1, characterized in that, The motor has an air gap, and among them, the magnetic blocks communicate directly with the air gap.

3. The hub motor outer rotor topology according to claim 1, characterized in that, Both sides of the magnetic isolation bridge are arranged at an angle with its center line to form a limiting surface for clamping the magnetic blocks.

4. The hub motor outer rotor topology according to claim 1, characterized in that, The magnetic isolation bridge and the magnetic blocks have different magnetic permeabilities, so that the inductances of the D-axis and Q-axis of the motor are different.

5. The hub motor outer rotor topology according to claim 1, characterized in that, The salient pole ratio of the motor is 1.4 - 1.

6.

6. The hub motor outer rotor topology according to claim 1, characterized in that, The material of the magnetic blocks is sintered neodymium iron boron magnet.

7. An electric bicycle, characterized in that, The electric bicycle includes the hub motor outer rotor topological structure according to any one of claims 1 - 6.

8. An electric motorcycle, characterized in that, The electric motorcycle includes the hub motor outer rotor topological structure according to any one of claims 1 - 6.

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