Axial flux motor rotation connection structure and axial flux motor

Abstract

The utility model relates to an axial magnetic flux motor rotating connection structure and an axial magnetic flux motor. The axial magnetic flux motor rotating connection structure comprises a rotor, a rotating shaft and two stators. The rotor and the rotating shaft are coaxially connected; the two stators are arranged on the two sides of the rotor respectively, each stator comprises a stator iron core, a stator yoke and a connecting sleeve, the stator yokes are connected with the stator iron cores and the connecting sleeves, and the rotating shaft is rotationally arranged in the connecting sleeves of the two stators; wherein the stator yoke is made of a magnetic conductive material, and the connecting sleeve is made of a non-magnetic conductive material. In the embodiment of the invention, a part of the stator yoke is arranged as the connecting sleeve, and the non-magnetic connecting sleeve is arranged between the stator yoke and the rotating shaft, so that a good magnetic isolation purpose can be achieved, the influence of the magnetic field of the magnetic stator on other metal components such as a bearing of the motor is effectively avoided, the distribution of the magnetic field between the magnet and the magnetic code is not disturbed, and meanwhile, the stability of the motor is improved. And the split design of the stator yoke and the connecting sleeve divides a special-shaped piece into two regular pieces, so that the part processing difficulty is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an axial flux motor rotating connection structure and an axial flux motor. BACKGROUND

[0002] The axial flux motor, especially the PCB (Printed Circuit Board) based axial flux motor, is a compact and efficient motor, which combines the flat structure of the axial flux motor and the PCB technology, so that it performs superior in power density, heat dissipation and manufacturing cost, etc., and is suitable for applications with small size but large output torque, such as flexible hand motors in the robot industry, joint motors, unmanned aerial vehicle drive motors in the small unmanned aerial vehicle industry, and miniature motor applications in the high-end medical industry.

[0003] In the prior art, the stator yoke of the PCB axial flux motor is made of a magnetic material, and the PCB magnetic encoding chip of the PCB axial flux motor needs to receive the magnetic encoding signal of the magnet to detect the magnetic field of the magnet. The stator yoke with magnetism will disturb the magnetic field distribution between the magnet and the magnetic encoding, affect the reception of the magnetic encoding signal, and thus affect the normal operation of the motor. CONTENT OF THE INVENTION

[0004] In order to solve the above technical problems, the present application provides an axial flux motor rotating connection structure and an axial flux motor.

[0005] In a first aspect, the present application discloses an axial flux motor rotating connection structure, comprising a rotor, a rotating shaft and two stators.

[0006] The rotor and the rotating shaft are coaxially connected; the two stators are arranged on the two sides of the rotor respectively, and each of the two stators comprises a stator core, a stator yoke and a connecting sleeve, the stator yoke connects the stator core and the connecting sleeve, and the rotating shaft is rotatably arranged in the connecting sleeve of the two stators.

[0007] The stator yoke is made of a magnetic material, and the connecting sleeve is made of a non-magnetic material.

[0008] In some possible embodiments, the connecting sleeve comprises a first connecting part and a second connecting part.

[0009] A rotating connecting piece is further arranged between the connecting sleeve and the rotating shaft, the rotating connecting piece is connected with the first connecting part, and the second connecting part is connected with the stator yoke.

[0010] In some possible embodiments, the connecting sleeve is provided with a connecting cavity along the axial direction.

[0011] The rotating connecting piece comprises a magnet, a bowl-shaped support and a connecting bearing, the magnet, the bowl-shaped support and the connecting bearing are coaxially arranged and located in the connecting cavity.

[0012] The connecting bearing is coaxially connected with the rotating shaft; the bowl-shaped support is provided with a containing groove in the direction of its own axis, and the magnet is arranged in the containing groove and faces away from the connecting bearing.

[0013] In some possible embodiments, a printed circuit board is further included, and the printed circuit board is provided with a motor control circuit and an angle feedback circuit; the angle feedback circuit includes a magnetic encoding chip;

[0014] The printed circuit board is arranged on the side of the stator yoke away from the rotor and faces the magnet.

[0015] In some possible embodiments, the stator yoke is in a circular ring shape, and the stator yoke is provided with a connecting through groove; the second connecting part of the connecting sleeve is arranged in the connecting through groove;

[0016] The diameter of the first connecting part is smaller than the diameter of the second connecting part.

[0017] In some possible embodiments, a magnetic separation sheet is further arranged between the inner wall of the connecting through groove and the outer wall of the second connecting part.

[0018] In some possible embodiments, a buffer gasket is further arranged between the inner wall of the connecting through groove and the outer wall of the second connecting part.

[0019] In some possible embodiments, the edges of the connecting sleeve are all connected through a circular arc.

[0020] In some possible embodiments, the stator yoke is made of 1J22 material, and the connecting sleeve is made of SUS316 material.

[0021] In the second aspect, the embodiments of the present application disclose an axial flux motor including the axial flux motor rotating connection structure of any one of the above.

[0022] The technical scheme provided by the embodiments of the present application has the following technical effects:

[0023] The axial flux motor rotation connection structure of this application embodiment includes a rotor, a shaft, and two stators. The rotor and shaft are coaxially connected. The two stators are respectively disposed on both sides of the rotor. Each stator includes a stator core, a stator yoke, and a connecting sleeve. The stator yoke connects the stator core and the connecting sleeve. The shaft is rotatably disposed in the connecting sleeve of the two stators. The stator yoke is made of a magnetically conductive material, while the connecting sleeve is made of a non-magnetically conductive material. In this application embodiment, by setting a portion of the stator yoke as a connecting sleeve, which connects the rotor and the shaft, and by using a magnetically conductive material for the stator yoke and a non-magnetically conductive material for the connecting sleeve, the non-magnetically conductive connecting sleeve is disposed between the stator yoke and the shaft. This effectively isolates the magnetic field, preventing the magnetic field of the magnetic stator from affecting the bearings and other metal components of the motor. It prevents magnetic leakage and does not disrupt the magnetic field distribution between the magnet and the magnetic encoder, greatly improving motor performance. Furthermore, the separate design of the stator yoke and the connecting sleeve divides an irregularly shaped component into two regular components, reducing the difficulty of part processing and improving the manufacturing feasibility of the product. Attached Figure Description

[0024] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of an axial flux motor rotation connection structure provided in an embodiment of this application. Figure 1 ;

[0026] Figure 2 This is a schematic diagram of an axial flux motor rotation connection structure provided in an embodiment of this application. Figure 2 ;

[0027] Figure 3 This is a schematic diagram of an axial flux motor rotation connection structure provided in an embodiment of this application. Figure 3 .

[0028] Figure label:

[0029] 1. Rotor;

[0030] 2. Shaft;

[0031] 3. Stator; 31. Stator core; 32. Stator yoke; 33. Connecting sleeve; 331. First connecting part; 332. Second connecting part;

[0032] 4. Rotating connector; 41. Magnet; 42. Bowl-shaped bracket; 43. Connecting bearing;

[0033] 5. Printed circuit board. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0035] It should be noted that the "one embodiment" or "an embodiment" in the specification of the embodiments of the present application means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. It should be understood that in the specification and claims of the embodiments of the present application and the above drawings, the terms "upper", "lower", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and do not necessarily be used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, in the description of the embodiments, the meaning of "a plurality of" is two or more, unless otherwise specified. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system or product including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0036] It should be apparent that when a device or assembly is referred to as being "on", "adjacent", or "connected" to another device or assembly, it can be directly on, adjacent to, or connected to the other device or assembly, or intervening devices or assemblies can be present. In contrast, when a device or assembly is referred to as being "directly on", "directly adjacent", or "directly connected" to another device or assembly, there are no intervening devices or assemblies present. It should be apparent that although the terms first, second, third, etc. can be used herein to describe various components, regions, layers and / or sections, these components, regions, layers and / or sections should not be limited by these terms. These terms are simply used to distinguish one component, region, layer or section from another component, region, layer or section. Thus, a first component, region, layer or section discussed below could be termed a second component, region, layer or section without departing from the teachings of the present application. Conversely, a second component, region, layer or section discussed below could be termed a first component, region, layer or section without departing from the teachings of the present application.

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present application and should not be used to limit the embodiments of the present application.

[0038] The embodiments of the present application provide an axial flux motor rotating connection structure. Figure 1 The embodiments of the present application provide an axial flux motor rotating connection structure. Figure 1 , Figure 1 The embodiments of the present application provide an axial flux motor rotating connection structure. Figure 2 The axial flux motor rotating connection structure includes a rotor 1, a rotating shaft 2 and two stators 3.

[0039] In a possible embodiment, the rotor 1 and the rotating shaft 2 are coaxially connected and synchronously rotate. The two stators 3 are respectively arranged on two sides of the rotor 1.

[0040] Optionally, the two stators 3 each include a stator core 31, a stator yoke 32 and a connecting sleeve 33. The stator yoke 32 connects the stator core 31 and the connecting sleeve 33. The two ends of the rotating shaft 2 are respectively arranged in the connecting sleeves 33 of the two stators 3 in a rotating manner. Therefore, the rotor 1 and the rotating shaft 2 can rotate relative to the two stators 3.

[0041] The stator yoke 32 is made of a magnetic conductive material, and the connecting sleeve 33 is made of a non-magnetic conductive material. Preferably, the stator yoke 32 is made of 1J22 material, and the connecting sleeve 33 is made of SUS316 material. The 1J22 material is a soft magnetic alloy material, which belongs to low-carbon steel and has a high saturation magnetic induction intensity, can carry more magnetic flux density in a magnetic field, and improves the efficiency and output power of the motor. The SUS316 material is a stainless steel material, which is a non-magnetic material, has very low magnetic conductivity, does not affect the distribution of the magnetic field in a strong magnetic field, and has high mechanical strength and good toughness, ensuring the stability of the connection between the rotor 1 and the rotating shaft 2.

[0042] By the above arrangement, part of the stator yoke 32 is separated and arranged as the connecting sleeve 33, the connecting sleeve 33 connects the rotor 1 and the rotating shaft 2, the stator yoke 32 is made of a magnetic conductive material, and the connecting sleeve 33 is made of a non-magnetic conductive material. The non-magnetic connecting sleeve 33 is arranged between the stator yoke 32 and the rotating shaft 2, which can play a good magnetic isolation purpose, effectively avoid the influence of the magnetic field of the magnetic stator 3 on the bearings and other metal components of the motor, and will not cause magnetic leakage phenomenon, nor will it disturb the magnetic field distribution between the magnet and the magnetic code. Greatly improve the performance of the motor, at the same time, the split design of the stator yoke 32 and the connecting sleeve 33 divides an irregular special-shaped part into two regular parts, reduces the processing difficulty of the part, and improves the manufacturing feasibility of the product.

[0043] Figure 1 is a schematic diagram of an axial flux motor rotating connection structure provided by an embodiment of the present application Figure 2 As shown in Figure 3 In some possible embodiments, the connecting sleeve 33 is in a cylindrical shape, and includes a first connecting portion 331 and a second connecting portion 332 arranged coaxially. A rotating connecting piece 4 is further arranged between the connecting sleeve 33 and the rotating shaft 2, and the rotating connecting piece 4 is connected with the first connecting portion 331, so that the rotating shaft 2 and the rotor 1 can rotate smoothly relative to the connecting sleeve 33. The second connecting portion 332 of the connecting sleeve 33 is connected with the stator yoke 32.

[0044] In some possible embodiments, the stator yoke 32 is in a circular ring shape, and the stator yoke 32 is provided with a connecting through slot in the direction of its own axis. The second connecting portion 332 of the connecting sleeve 33 is arranged in the connecting through slot.

[0045] In order to ensure the stable connection between the connecting sleeve 33 and the stator yoke 32, in the embodiments of the present application, the diameter of the first connecting portion 331 is smaller than the diameter of the second connecting portion 332, and the outer wall of the second connecting portion 332 is in abutment with the inner wall of the connecting through slot, so that the contact area is larger, and the connecting sleeve 33 and the stator yoke 32 can be stably connected.

[0046] In some possible embodiments, a magnetic isolation sheet is additionally arranged between the inner wall of the connecting groove and the outer wall of the second connecting part 332. Alternatively, a magnetic isolation plating layer can be additionally arranged on the outer wall of the second connecting part 332.

[0047] Specifically, the magnetic isolation sheet can be in a circular ring shape, and the material can be a high-performance non-magnetic material such as stainless steel, non-magnetic ceramic, or composite magnetic isolation material. The additional magnetic isolation sheet or magnetic isolation plating layer can further block the magnetic leakage phenomenon caused by the stator 3, avoid the diffusion of the magnetic field to other components such as the connecting bearing 43, reduce the interference of the magnetic encoding chip with the magnetic encoding signal, ensure the magnetic signal transmission between the magnet 41 and the magnetic encoding chip to be more accurate, and improve the motor angle detection and control accuracy.

[0048] In some possible embodiments, a buffer gasket can be additionally arranged between the inner wall of the connecting groove and the outer wall of the second connecting part 332. The buffer gasket is arranged between the inner wall of the connecting groove and the outer wall of the second connecting part 332 and is attached to the surfaces of the two. When the rotor 1 rotates, vibration or collision may occur. The buffer gasket can effectively absorb the vibration and impact generated during the operation of the motor, reduce the mechanical stress between the connecting groove and the second connecting part 332, avoid the wear of the parts, and also reduce the noise that may be caused.

[0049] Specifically, the buffer gasket can be in a circular ring shape or a multi-segment form, and can be supported to be detached and replaced. The thickness and shape of the buffer gasket can be adjusted according to actual needs to enhance the concentricity of the rotation of the rotor 1 and the rotating shaft 2. The material of the buffer gasket can be high-elasticity silica gel, wear-resistant rubber, polyurethane, or a metal elastic body material.

[0050] Figure 1 FIG. 1 is a schematic diagram of an axial flux motor rotating connection structure provided by an embodiment of the present application Figure 3 As shown in Figure 2 and combined with Figure 3 , the second connecting part 332 is arranged on the rotating shaft 2, and the first connecting part 331 is arranged on the rotor 1. Figure 1 is a partial enlarged schematic view of Figure 3 In some possible embodiments, the connecting sleeve 33 is provided with a connecting cavity in the axial direction, for connecting the rotating connecting part 4.

[0051] As shown in Figure 3 , the rotating connecting part 4 includes a magnet 41, a bowl-shaped support 42, and a connecting bearing 43. The magnet 41, the bowl-shaped support 42, and the connecting bearing 43 are coaxially arranged and located in the connecting cavity. The connecting bearing 43 is coaxially connected with the rotating shaft 2. The bowl-shaped support 42 is provided with an accommodating groove in the axial direction of the bowl-shaped support 42, and the magnet 41 is arranged in the accommodating groove and faces away from the connecting bearing 43. The magnet 41 and the bowl-shaped support 42 are driven by the rotating shaft 2 and rotate synchronously with the rotor 1. When the magnet 41 rotates, the magnetic field changes correspondingly.

[0052] In some possible embodiments, the axial flux motor rotating connection structure further comprises a printed circuit board 5, and the printed circuit board 5 is provided with a motor control circuit and an angle feedback circuit. The motor control circuit is used for receiving an externally input control signal and converting the control signal into a driving current to control the rotating speed and rotating direction of the motor. The angle feedback circuit comprises a magnetic encoding chip, and the magnetic encoding chip is used for sensing the magnetic field change of the rotor 1 and detecting the rotating angle of the rotor 1 in real time to ensure the accurate feedback of the motor operating position.

[0053] As shown in ​ the printed circuit board 5 is arranged on the side of the stator yoke 32 away from the rotor 1 and faces the direction of the magnet 41. The magnetic encoding chip is arranged in the direction of the magnet 41 and can accurately sense the magnetic encoding signal of the magnet 41 rotating with the rotor 1 and the rotating shaft 2 to realize accurate angle feedback.

[0054] Through the above arrangement, the magnetic field between the magnet 41 and the magnetic encoding chip on the printed circuit board 5 is isolated from the magnetic field of the part of the stator yoke 32 by the connecting sleeve 33, and the two magnetic fields do not interfere with each other, the signal reception of the magnetic encoding is not affected, the magnetic encoding signal received by the magnetic encoding chip is more accurate, and the performance of the motor is improved.

[0055] Since the sharp turning may cause local magnetic field distortion or eddy current formation, affecting the smooth distribution of the magnetic field, in the embodiment of the application, the edge turning portions of the connecting sleeve 33, especially the turning portions of the inner wall of the connecting sleeve 33 are all transitioned through arcs. The arc transition can effectively reduce the sharp change or sharp corners at the edge of the connecting sleeve 33, thereby avoiding the change of the magnetic field at the edge turning portion to interfere with the performance of the motor.

[0056] The embodiment of the application further provides an axial flux motor comprising the above axial flux motor rotating connection structure. By arranging the axial flux motor rotating connection structure on the axial flux motor, a part of the stator yoke is separated and arranged as a connecting sleeve, the connecting sleeve connects the rotor and the rotating shaft, the material of the stator yoke is a magnetic conductive material and the material of the connecting sleeve is a non-magnetic conductive material, the non-magnetic conductive connecting sleeve is arranged between the stator yoke and the rotating shaft and can play a good magnetic isolation purpose, effectively avoiding the influence of the magnetic field of the magnetic stator on the bearings and other metal components of the motor, without causing magnetic leakage phenomenon and without disturbing the magnetic field distribution between the magnet and the magnetic encoding, greatly improving the performance of the motor. Meanwhile, the split design of the stator yoke and the connecting sleeve divides an irregular special-shaped part into two regular parts, reduces the difficulty of part machining, and improves the manufacturing feasibility of the product.

[0057] It should be noted that the above-mentioned order of the embodiments of the present application is only for description, and does not represent the advantages and disadvantages of the embodiments. And the above describes the specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than the order in which they are recited and still achieve desirable results. In addition, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous or necessary.

[0058] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0059] A person of ordinary skill in the art can understand that all or part of the steps of the above-mentioned embodiments can be completed by hardware, or by program instructing relevant hardware to complete, and the program can be stored in a computer readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk.

[0060] The above only describes the preferred embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An axial flux motor rotational connection structure, characterized by, The axial flux motor comprises a rotor (1), a rotating shaft (2) and two stators (3). The rotor (1) and the rotating shaft (2) are coaxially connected; the two stators (3) are arranged on the two sides of the rotor (1) respectively, and each of the two stators (3) comprises a stator core (31), a stator yoke (32) and a connecting sleeve (33); the stator yoke (32) connects the stator core (31) and the connecting sleeve (33); the rotating shaft (2) is rotatably arranged in the connecting sleeve (33) of each of the two stators (3). The stator yoke (32) is made of a magnetic conductive material, and the connecting sleeve (33) is made of a non-magnetic conductive material.

2. The axial flux motor rotational connection structure of claim 1, wherein, The connecting sleeve (33) comprises a first connecting part (331) and a second connecting part (332). A rotating connecting piece (4) is further arranged between the connecting sleeve (33) and the rotating shaft (2); the rotating connecting piece (4) is connected with the first connecting part (331); and the second connecting part (332) is connected with the stator yoke (32).

3. The axial flux motor rotational connection structure of claim 2, wherein, The connecting sleeve (33) is provided with a connecting cavity along the axial direction. The rotating connecting piece (4) comprises a magnet (41), a bowl-shaped bracket (42) and a connecting bearing (43); the magnet (41), the bowl-shaped bracket (42) and the connecting bearing (43) are coaxially arranged and located in the connecting cavity. The connecting bearing (43) is coaxially connected with the rotating shaft (2); the bowl-shaped bracket (42) is provided with an accommodating groove along the axial direction of the bowl-shaped bracket (42); and the magnet (41) is arranged in the accommodating groove and faces away from the connecting bearing (43).

4. The axial flux motor rotational connection structure of claim 3, wherein, A printed circuit board (5) is further arranged, and the printed circuit board (5) is provided with a motor control circuit and an angle feedback circuit; the angle feedback circuit comprises a magnetic encoding chip. The printed circuit board (5) is arranged on the side of the stator yoke (32) away from the rotor (1) and faces the magnet (41).

5. The axial flux motor rotational connection structure of claim 2, wherein, The stator yoke (32) is in the shape of a ring, and the stator yoke (32) is provided with a connecting groove; the second connecting part (332) of the connecting sleeve (33) is arranged in the connecting groove. The diameter of the first connecting part (331) is smaller than the diameter of the second connecting part (332).

6. The axial flux motor rotational connection structure of claim 5, wherein, A magnetic separation sheet is further arranged between the inner wall of the connecting groove and the outer wall of the second connecting part (332).

7. The axial flux motor rotational connection structure of claim 5, wherein, A buffer gasket is further arranged between the inner wall of the connecting groove and the outer wall of the second connecting part (332).

8. The axial flux motor rotational connection structure of claim 1, wherein, The edges of the connecting sleeve (33) are all connected through a circular arc.

9. The axial flux motor rotational connection structure of claim 1, wherein, The stator yoke (32) is made of 1J22 material, and the connecting sleeve (33) is made of SUS316 material.

10. An axial flux electric machine characterized by, The axial flux motor rotating connecting structure comprises the axial flux motor rotating connecting structure according to any one of claims 1-9.

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