Spoke type rotor assembly, permanent magnet synchronous motor and scooter

Abstract

The invention relates to the technical field of power-assisted bicycles, in particular to a spoke type rotor assembly, a permanent magnet synchronous motor and a scooter. The spoke type rotor assembly in the permanent magnet synchronous motor in the scooter comprises a cylinder body, spoke protruding strips and permanent magnets, the cylinder body extends in the axial direction, the multiple spoke protruding strips are fixed to the peripheral wall of the cylinder body at intervals in the circumferential direction and extend in the radial direction, a fixing space is formed between every two adjacent spoke protruding strips, and the permanent magnets are arranged in the fixing space. The fixing space comprises a first area and a second area which are sequentially arranged in the radial direction, the first area is located at the end, away from the barrel, of the second area, a permanent magnet is arranged in the first area, magnetic poles of the permanent magnet are located at the two ends of the permanent magnet in the axial direction respectively, and the end, close to the second area in the radial direction, of the permanent magnet extends into the second area. The magnetic flux generated by the part, extending into the second area, of the permanent magnet can be filled in the magnetic flux leakage path, so that the magnetic flux leakage path is filled with the magnetic flux in advance, and the magnetic flux generated by the permanent magnet in the first area serves as the main magnetic flux for generating torque.

Description

Technical Field

[0001] This invention relates to the field of electric bicycle technology, and more particularly to spoke-type rotor assemblies, permanent magnet synchronous motors, and scooters. Background Technology

[0002] Scooters, as a low-cost, easy-to-operate, and emission-free mode of transportation, are widely popular and widely used. However, their complex structure makes lightweight maintenance difficult, thus portability and lightweight design are of great concern. Permanent magnet synchronous motors (PMSMs), with their high efficiency, high power density, and excellent control performance, have become core drive components in modern industry and civilian applications, finding widespread use across various sectors. In scooters, PMSMs serve as the power source. A PMSM consists of a rotor assembly and a stator assembly. The rotor assembly contains permanent magnets, and the stator assembly generates a rotating magnetic field. The rotating magnetic field interacts with the permanent magnets to produce synchronous torque, eliminating the need for external excitation of the rotor assembly. PMSMs offer higher overall efficiency than traditional asynchronous motors and can output constant torque.

[0003] In related technologies, the rotor assembly has a spoke-type structure. The spoke-type rotor assembly adopts a spoke topology design, and the rotor core within the rotor assembly also uses a spoke structure, with multiple permanent magnets embedded and fixed within the magnetic slots of the rotor core. In existing spoke-type rotor assemblies, such as... Figure 1 As shown, the existing permanent magnet 3 has its magnetic leakage reduced by installing a magnetic isolation bridge 2 at the bottom of the existing magnet slot 11 of the existing rotor core 1. However, due to the presence of supporting and limiting ribs 12 at the bottom of the existing magnet slot 11, some magnetic leakage still exists at the bottom of the existing permanent magnet 3. This leakage of magnetic flux will reduce the amount of magnetic flux entering the air gap between the stator assembly and the rotor assembly, thus reducing the main magnetic flux used to generate torque, resulting in a smaller output torque for the existing spoke-type rotor assembly.

[0004] Therefore, there is an urgent need to invent spoke-type rotor assemblies, permanent magnet synchronous motors, and scooters to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a spoke-type rotor assembly, a permanent magnet synchronous motor, and a scooter, so as to prevent the main magnetic flux used to generate torque in the permanent magnet from flowing into the leakage magnetic path, thereby increasing the output torque of the spoke-type rotor assembly, increasing the output power of the permanent magnet synchronous motor, and meeting the power requirements of the scooter.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The spoke-type rotor assembly includes:

[0008] A cylindrical body that extends axially;

[0009] a plurality of spoke ribs, the plurality of spoke ribs being fixed on the outer circumferential wall of the cylinder body in a circumferential direction, each of the plurality of spoke ribs extending in a radial direction, and a fixed space being formed between each two adjacent spoke ribs, the fixed space comprising a first region and a second region arranged in sequence in the radial direction, the first region being located at an end of the second region away from the cylinder body; and

[0010] a plurality of permanent magnets, one of the plurality of permanent magnets being fixed in each of the first regions, poles of the permanent magnets being located at two ends of the permanent magnets around the axial direction, and an end of the permanent magnet close to the second region extending into the second region in the radial direction.

[0011] Optionally, a magnetic flux provided by the part of the permanent magnet extending into the second region is A, a maximum magnetic flux allowed to pass in a leakage path formed between the two adjacent spoke ribs and the cylinder body is B, and the A is greater than the B.

[0012] Optionally, the spoke rib comprises a first extension part and a second extension part connected in sequence in the radial direction, the second extension part being fixedly connected with the cylinder body, the first extension part being located at an end of the second extension part away from the cylinder body, and a width of the first extension part around the axial direction is greater than a width of the second extension part around the axial direction.

[0013] The first region is formed between the two first extension parts between the two adjacent spoke ribs, and the second region is formed between the two second extension parts between the two adjacent spoke ribs.

[0014] Optionally, a side wall of the first extension part around the axial direction is adhesively fixed with the permanent magnet.

[0015] Optionally, the side wall of the first extension part around the axial direction has a stop protrusion located at an end of the first extension part away from the second extension part, the stop protrusion being used to stop and fix the permanent magnet in the radial direction.

[0016] A permanent magnet synchronous motor comprising a stator assembly and a spoke rotor assembly as described above.

[0017] The stator assembly comprises a stator core and a coil winding, the stator core being in a cylindrical shape, the stator core being sleeved on an outer periphery of the spoke rotor assembly in the axial direction, an inner cavity wall of the stator core being provided with a plurality of stator teeth, the plurality of stator teeth being arranged in a circumferential direction, each of the stator teeth extending in the radial direction, and the coil winding comprising a plurality of coil units, each of the stator teeth being clamped and fixed with one of the coil units.

[0018] As an option, the coil monomer is formed by winding a wire on the stator tooth, the cross section of the wire is rectangular, the length-width ratio of the rectangle is K, the K is greater than or equal to 0.5 and less than or equal to 2, and the contact between the adjacent two turns of the coil monomer is surface contact.

[0019] As an option, the surface of the wire is coated with an insulating layer, and the thickness of the insulating layer is 20-30 μm.

[0020] And / or, the edges of the wire have a first chamfer, and the chamfer radius of the first chamfer is 0.1-0.5 mm.

[0021] As an option, the stator core comprises:

[0022] A plurality of core monomers, each of the core monomers has the stator tooth, and the plurality of core monomers are sequentially arranged around the axial direction in the state of the stator tooth facing the axial center of the axial direction; and

[0023] A plurality of insulating skeletons, each of the surfaces of the stator tooth in the core monomers is covered with one of the insulating skeletons, and the insulating skeleton is configured to be in contact with the coil monomer.

[0024] As an option, the insulating skeleton is provided with a wire passing notch for accommodating the wire inlet of the coil monomer.

[0025] The edges of the insulating skeleton have a second chamfer, and the chamfer radius of the second chamfer is not less than 0.5 mm.

[0026] A scooter comprising a frame, a wheel, a transmission structure and a permanent magnet synchronous motor as described above, the wheel, the transmission structure and the permanent magnet synchronous motor are all mounted on the frame, the output end of the permanent magnet synchronous motor is connected with the input end of the transmission structure, the output end of the transmission structure is connected with the wheel, and the permanent magnet synchronous motor is configured to drive the wheel to rotate.

[0027] The beneficial effects of the present application are:

[0028] The spoke type rotor assembly provided by the application comprises a plurality of spoke convex strips which are fixed on the outer circumferential wall of the cylinder body in a circumferentially spaced manner and extend along the radial direction, a fixed space is formed between each two adjacent spoke convex strips, the fixed space is divided into a first area and a second area which are arranged in sequence along the radial direction, the first area is located at one end of the second area close to the cylinder body, a permanent magnet is fixed in each first area, and two magnetic poles of the permanent magnet are arranged at the two ends of the permanent magnet around the axial direction, thereby forming the basic structure of the spoke type rotor assembly.

[0029] The application further provides a permanent magnet synchronous motor, which can reduce the leakage magnetic flux and improve the output power of the permanent magnet synchronous motor by using the spoke type rotor assembly.

[0030] The application further provides a scooter, which can improve the output power and meet the power demand of the scooter by using the permanent magnet synchronous motor. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 FIG. 1 is a structural schematic diagram of a spoke type rotor assembly in the prior art;

[0032] Figure 2 FIG. 2 is a structural schematic diagram of a spoke type rotor assembly provided by an embodiment of the application;

[0033] Figure 3 FIG. 3 is a structural schematic diagram of a stator assembly provided by an embodiment of the application;

[0034] Figure 4 FIG. 4 is a structural schematic diagram of an iron core monomer, an insulation framework and a coil monomer provided by an embodiment of the application;

[0035] Figure 5 FIG. 5 is a structural schematic diagram of an iron core monomer, an insulation framework and a coil monomer made of a round wire in the prior art;

[0036] Figure 6 FIG. 6 is a sectional schematic diagram of a wire rod provided by an embodiment of the application;

[0037] Figure 7is a first structural schematic diagram of an insulating framework provided by an embodiment of the present application;

[0038] Figure 8 is a second structural schematic diagram of an insulating framework provided by an embodiment of the present application;

[0039] Figure 9 is a third structural schematic diagram of an insulating framework provided by an embodiment of the present application;

[0040] Figure 10 is a structural schematic diagram of a scooter provided by the present application.

[0041] In the drawings:

[0042] 1, existing rotor core; 11, existing magnetic steel slot; 12, support limiting rib; 2, magnetic isolation bridge; 3, existing permanent magnet;

[0043] 100, spoke rotor assembly; 110, cylinder; 120, spoke convex strip; 121, first extension; 1211, stop protrusion; 122, second extension; 130, fixed space; 131, first area; 132, second area; 140, permanent magnet;

[0044] 200, stator assembly; 210, stator core; 211, core monomer; 2111, stator tooth; 212, insulating framework; 2121, wire passing gap; 2122, stop convex ring; 21221, annular extension boss; 220, coil winding;

[0045] 300, wire;

[0046] 1000, scooter; 1010, frame; 1020, wheel; 1030, transmission structure; 1040, permanent magnet synchronous motor. DETAILED DESCRIPTION

[0047] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar parts or parts having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In the description of the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first feature and the second feature are in direct contact, or that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0050] Scooters are widely used as low-cost, easy-to-operate and emission-free transportation tools, and are widely popular among the public. However, the scooter structure is complex, and it is difficult to achieve lightweight maintenance, so the portability and lightweight degree of the scooter are also concerned by the public. Permanent magnet synchronous motor has become the core driving component in modern industrial and civil fields due to its high efficiency, high power density, excellent control performance and other core advantages, and is widely used in various fields. In the scooter, the permanent magnet synchronous motor can be used as the power source of the scooter. The permanent magnet synchronous motor includes a rotor assembly and a stator assembly, the rotor assembly has a permanent magnet, and the stator assembly can generate a stator rotating magnetic field. The stator rotating magnetic field interacts with the permanent magnet to generate a synchronous torque, so that the rotor assembly does not need external excitation, and the overall efficiency of the permanent magnet synchronous motor is higher than that of the traditional asynchronous motor, and a constant torque can be output. In the related technology, the rotor assembly has a spoke structure, the spoke structure rotor assembly adopts a spoke topology design scheme, and the rotor core in the rotor assembly adopts a spoke structure, and a plurality of permanent magnets are embedded and fixed in the magnet steel groove of the rotor core. In the existing spoke rotor assembly, as shown in Figure 1 The bottom of the existing magnet steel groove 11 of the existing rotor core 1 is provided with a magnetic isolation bridge 2 to reduce the leakage of the existing permanent magnet 3, but due to the existence of the support limiting rib 12 at the bottom of the existing magnet steel groove 11, a part of the bottom of the existing permanent magnet 3 still has leakage. This part of the leaked magnetic flux will reduce the magnetic flux entering the air gap between the stator assembly and the rotor assembly, that is, the main magnetic flux used to generate torque is reduced, thereby reducing the torque capacity of the existing spoke rotor assembly.

[0051] In order to solve the above problems, as shown in Figure 2As shown, this embodiment provides a spoke-type rotor assembly 100. The spoke-type rotor assembly 100 includes a cylindrical body 110, multiple spoke protrusions 120, and multiple permanent magnets 140. The cylindrical body 110 extends axially, and the multiple spoke protrusions 120 are fixed circumferentially at intervals on the outer peripheral wall of the cylindrical body 110. Each spoke protrusion 120 extends radially, and a fixed space 130 is formed between each pair of adjacent spoke protrusions 120. The fixed space 130 includes a first region 131 and a second region 132 arranged radially in sequence. The first region 131 is located at the end of the second region 132 away from the cylindrical body 110. A permanent magnet 140 is fixed in each first region 131. The magnetic poles of the permanent magnet 140 are located at both ends of the permanent magnet 140 around the axial direction. The end of the permanent magnet 140 extending radially into the second region 132 is closer to the second region 132.

[0052] The spoke-type rotor assembly 100 has multiple spoke protrusions 120 circumferentially fixed on the outer peripheral wall of the cylindrical body 110 extending axially, so that each spoke protrusion 120 extends radially, forming a fixed space 130 between every two adjacent spoke protrusions 120. The fixed space 130 is divided into a first region 131 and a second region 132 arranged radially, with the first region 131 located near one end of the second region 132 close to the cylindrical body 110. A permanent magnet 140 is fixed in each first region 131, with the two magnetic poles of the permanent magnet 140 respectively positioned at both ends of the permanent magnet 140 around the axial direction. This constitutes the basic structure of the spoke-type rotor assembly 100. The permanent magnet 140 extends radially into the second region 132, allowing the magnetic flux generated by the portion of the permanent magnet 140 extending into the second region 132 to fill the leakage magnetic path formed by the corresponding two spoke protrusions 120 and the cylinder 110. This pre-fills the leakage magnetic path with magnetic flux, preventing the magnetic flux generated by the permanent magnet 140 in the first region 131 from flowing back into the leakage magnetic path. The magnetic flux generated by the permanent magnet 140 in the first region 131 can only enter the air gap between the spoke rotor assembly 100 and the stator assembly. In other words, the magnetic flux generated by the permanent magnet 140 in the first region 131 can only serve as the main magnetic flux for generating torque, thereby increasing the output torque of the spoke rotor assembly 100.

[0053] It should be noted that in this embodiment, the magnetic poles of two adjacent permanent magnets 140 in the spoke rotor assembly 100 are opposite to ensure that the spoke rotor assembly 100 can work normally.

[0054] To further improve the output torque of the spoke rotor assembly 100, the magnetic flux provided by the portion of the permanent magnet 140 extending into the second region 132 is A, and the maximum magnetic flux allowed to pass through the leakage magnetic path formed between the two adjacent spoke protrusions 120 and the cylinder 110 is B, where A is greater than B. By making the magnetic flux A provided by the portion of the permanent magnet 140 extending into the second region 132 greater than the maximum magnetic flux B allowed to pass through the leakage magnetic path formed between the two adjacent spoke protrusions 120 and the cylinder 110, in actual operation, the magnetic flux A provided by the portion of the permanent magnet 140 extending into the second region 132 will be divided into a first part and a second part. The first part is equal to the maximum magnetic flux B allowed to pass through the leakage magnetic path formed between the two adjacent spoke protrusions 120 and the cylinder 110. The first part fills the leakage magnetic path to prevent the magnetic flux generated by the permanent magnet 140 in the first region 131 from flowing into the leakage magnetic path again. The second part will enter the air gap between the spoke rotor assembly 100 and the stator assembly as an additional main magnetic flux to achieve the effect of increasing the output torque of the spoke rotor assembly 100.

[0055] As an optional embodiment, the spoke rib 120 includes a first extension 121 and a second extension 122 connected in a radial direction. The second extension 122 is fixedly connected to the cylinder 110. The first extension 121 is located at the end of the second extension 122 away from the cylinder 110. The width of the first extension 121 around the axial direction is greater than the width of the second extension 122 around the axial direction. The two first extensions 121 between two adjacent spoke ribs 120 constitute a first region 131, and the two second extensions 122 between two adjacent spoke ribs 120 constitute a second region 132. By splitting the spoke protrusion 120 into a first extension 121 and a second extension 122 connected radially in sequence, the second extension 122 is fixedly connected to the cylinder 110, and the first extension 121 is located at the end of the second extension 122 away from the cylinder 110, and ensuring that the width of the first extension 121 around the axial direction is greater than the width of the second extension 122 around the axial direction, the two first extensions 121 between two adjacent spoke protrusions 120 form a first region 131, and the two second extensions 122 between two adjacent spoke protrusions 120 form a second region 132. This allows the width of the first region 131 around the axial direction to be smaller than the width of the second region 132 around the axial direction, thereby allowing the permanent magnet 140 fixed in the first region 131 to extend into the second region 132 without interfering with the spoke protrusion 120.

[0056] In an optional embodiment, the first extension 121 is bonded and fixed to the permanent magnet 140 along its axial sidewall. By bonding and fixing the permanent magnet 140 to the first extension 121 along its axial sidewall, a stable fixation of the permanent magnet 140 and the first extension 121 can be achieved.

[0057] Furthermore, the first extension 121 has a stop protrusion 1211 on its axial sidewall. The stop protrusion 1211 is located at the end of the first extension 121 away from the second extension 122, and is used to stop and fix the permanent magnet 140 radially. By providing the stop protrusion 1211 on the axial sidewall of the first extension 121 and positioning the stop protrusion 1211 at the end of the first extension 121 away from the second extension 122, the stop protrusion 1211 is used to stop and fix the permanent magnet 140 radially. In actual operation, the stop protrusion 1211 can provide the permanent magnet 140 with a supporting force to counteract centrifugal force, further improving the fixation stability between the permanent magnet 140 and the first extension 121.

[0058] This embodiment also provides a permanent magnet synchronous motor. For example... Figure 3 As shown, the permanent magnet synchronous motor includes a stator assembly 200 and the aforementioned spoke-type rotor assembly 100. The stator assembly 200 includes a stator core 210 and a coil winding 220. The stator core 210 is cylindrical and is axially sleeved on the outer periphery of the rotor assembly. The inner wall of the stator core 210 is provided with a plurality of stator teeth 2111, which are arranged circumferentially at intervals. Each stator tooth 2111 extends radially. The coil winding 220 includes a plurality of coil units, and each stator tooth 2111 clamps and fixes one coil unit. By configuring the stator core 210 within the stator assembly 200 as a cylindrical shape, and placing the stator core 210 around the outer periphery of the spoke-type rotor assembly 100, and combining this with multiple stator teeth 2111 arranged circumferentially at intervals on the inner wall of the stator core 210, with each stator tooth 2111 clamping and fixing a single coil unit within the coil winding 220, the stator assembly 200 generates a stator rotating magnetic field, and utilizes the interaction between the stator rotating magnetic field and the permanent magnet 140 to output torque. Furthermore, this permanent magnet synchronous motor, by using the spoke-type rotor assembly 100, can reduce leakage magnetic flux and increase the output power of the permanent magnet synchronous motor.

[0059] In one of the alternative solutions, such as Figures 4-6As shown, the coil unit is formed by winding wire 300 on stator teeth 2111. The cross-section of wire 300 is rectangular, with an aspect ratio of K, where K is greater than or equal to 0.5 and less than or equal to 2. The contact between adjacent turns of wire within the coil unit is surface contact. By using wire 300 to form the coil unit on stator teeth 2111, the clamping and fixing effect between the coil unit and stator teeth 2111 can be improved. By limiting the cross-section of wire 300 to a rectangle, ensuring that the aspect ratio of the rectangle is greater than or equal to 0.5 and less than or equal to 2, and guaranteeing that the contact between adjacent turns of wire within the coil unit is surface contact, the heat transfer rate within the coil unit can be increased, significantly reducing the temperature rise rate of the coil winding 220. This allows for better control of the temperature rise of the permanent magnet synchronous motor, while simultaneously increasing the maximum torque value of the permanent magnet synchronous motor, extending the continuous high torque output time, and significantly improving insulation life. Furthermore, the surface contact between adjacent turns of wire within the coil unit can maximize the slot fill factor.

[0060] It should be noted that in this embodiment, K is preferably 1. In other embodiments, the value of K can also be set to any value between 0.5, 0.6, 0.7, 0.8, 0.9, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 0.5-2, depending on actual needs. This embodiment does not impose any specific limitations.

[0061] To ensure the normal operation of the coil winding 220, the surface of the wire 300 is covered with an insulating layer with a thickness of 20-30 μm. By wrapping the surface of the wire 300 with an insulating layer of 20-30 μm thickness, the insulation requirements of the wire 300 can be met while reducing the thickness of the insulating layer, avoiding the insulating layer occupying too much space, and ensuring the slot fill factor of the stator assembly 200. It should be noted that in this embodiment, the thickness of the insulating layer is 25 μm. In other embodiments, the thickness of the insulating layer can also be any value within 20 μm, 21 μm, 22 μm, 23 μm, 24 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, or 20-30 μm; this embodiment does not impose a specific limitation.

[0062] Furthermore, the edges of the wire 300 have a first chamfer, the radius of which is 0.1-0.5mm. By setting a first chamfer on the edges of the wire 300, the wire 300 is less prone to failure due to edge issues during long-term use, thus extending its service life. Limiting the chamfer radius to 0.1-0.5mm ensures the surface contact area between adjacent coil turns within the coil unit, guaranteeing heat transfer efficiency. If the chamfer radius is too large, the surface contact area between adjacent coil turns will decrease, even approaching line contact, affecting heat transfer efficiency. It should be noted that in this embodiment, the chamfer radius is 0.2mm. In other embodiments, the chamfer radius can be any value within 0.1mm, 0.3mm, 0.4mm, 0.5mm, or 0.1-0.5mm; this embodiment does not impose a specific limitation.

[0063] like Figure 3 As shown, the stator core 210 includes multiple core units 211 and an insulating frame 212. Each core unit 211 has stator teeth 2111. The multiple core units 211 and stator teeth 2111 are arranged sequentially around the axial direction, with the cores facing the center of the axial direction. An insulating frame 212 covers the surface of the stator teeth 2111 within each core unit 211, and the insulating frame 212 is configured to contact the coil unit. By dividing the stator core 210 into multiple core units 211 arranged sequentially around the axial direction, and ensuring that the stator teeth 2111 within each core unit 211 face the center of the axial direction, a cylindrical stator core 210 can be formed. Multiple stator teeth 2111 are axially arranged on the inner wall of the stator core 210. By covering the surface of each stator tooth 2111 with an insulating frame 212, which contacts the coil unit, the protection of the coil unit and the stator teeth 2111 can be improved.

[0064] Optionally, such as Figure 7 and Figure 8 As shown, the insulating frame 212 is provided with a wire-passing notch 2121, which is used to accommodate the incoming wire of the coil unit. By providing the wire-passing notch 2121 on the insulating frame 212, and accommodating the incoming wire of the coil unit, the problem of significantly bending the wire 300 before winding the coil unit is solved, thus improving the protection of the wire 300. It should be noted that, as Figure 7 As shown, the wire notch 2121 and the stator tooth 2111 are arranged radially opposite each other, or as... Figure 8 As shown, the guide notch 2121 and the stator tooth 2111 are radially misaligned. Understandably, the guide notch 2121 can be adjusted in position according to actual needs, and this embodiment does not impose specific limitations.

[0065] Furthermore, the edges of the insulating frame 212 have a second chamfer, and the radius of the second chamfer is not less than 0.5 mm. By providing a second chamfer at the edges of the insulating frame 212, ensuring that the radius of the second chamfer is not less than 0.5 mm, the problem of the edges of the insulating frame 212 scratching the insulation layer of the wire 300 is solved, further improving the protection of the wire 300. It should be noted that in this embodiment, the radius of the second chamfer is 0.8 mm. In other embodiments, the radius of the second chamfer can be adjusted arbitrarily within a range of not less than 0.5 mm; this embodiment does not impose specific limitations.

[0066] To achieve the positioning and fixation of the coil unit and the stator teeth 2111, a stop ring 2122 is provided at one end of the insulating frame 212 that is radially close to the spoke rotor assembly 100. The stop ring 2122 is configured to stop and fix the coil unit radially.

[0067] Optionally, the stop ring 2122 has an annular extending boss 21221. The annular extending boss 21221 is located at one end of the stop ring 2122 radially away from the spoke-type rotor assembly 100, and extends radially away from the spoke-type rotor assembly 100. The annular extending boss 21221 can be radially stopped and fixed to the coil unit. By providing the annular extending boss 21221 at the end of the stop ring 2122 away from the spoke-type rotor assembly 100, and fixing it to the coil unit by the annular extending boss 21221, the radial dimension within the insulating frame 212 used to accommodate the coil unit can be reduced. In the actual production process of the coil unit, the number of turns of the coil unit needs to be adjusted according to actual requirements. The larger the number of turns of the coil unit, the larger the radial dimension of the coil unit. If the number of turns of the coil unit is small, the radial dimension of the coil unit is small, and the coil unit will be radially offset relative to the insulating frame 212. By reducing the radial dimension within the insulating frame 212 used to accommodate the coil units, the clamping effect of the insulating frame 212 on the coil units is ensured. Understandably, as... Figure 9 As shown, when the number of turns of a single coil unit is large enough, the stop ring 2122 does not have an annular extended boss 21221, and the stop ring 2122 is directly fixed to the single coil unit in a radial stop.

[0068] like Figure 10As shown, this embodiment also provides a scooter 1000. The scooter 1000 includes a frame 1010, wheels 1020, a transmission structure 1030, and the aforementioned permanent magnet synchronous motor 1040. The wheels 1020, transmission structure 1030, and permanent magnet synchronous motor 1040 are all mounted on the frame 1010. The output terminal of the permanent magnet synchronous motor 1040 is connected to the input terminal of the transmission structure 1030, and the output terminal of the transmission structure 1030 is connected to the wheels 1020. The permanent magnet synchronous motor 1040 is configured to drive the wheels 1020 to rotate. It is understood that the specific structure and working principle of the frame 1010, wheels 1020, and transmission structure 1030 are all prior art and will not be described in detail here.

[0069] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A spoke rotor assembly characterized by, The application relates to a spoke rotor assembly. The spoke rotor assembly comprises a cylinder (110) extending along an axial direction, a plurality of spoke ribs (120) fixed on the outer peripheral wall of the cylinder (110) in a circumferential direction, each of the spoke ribs (120) extending along a radial direction, and a fixed space (130) formed between each two adjacent spoke ribs (120), wherein the fixed space (130) comprises a first region (131) and a second region (132) arranged in sequence along the radial direction, the first region (131) is located at one end of the second region (132) away from the cylinder (110), and a plurality of permanent magnets (140) are fixed in each of the first regions (131), wherein the magnetic poles of the permanent magnets (140) are located at two ends of the permanent magnets (140) around the axial direction, and one end of the permanent magnets (140) close to the second region (132) along the radial direction extends into the second region (132). The magnetic flux provided by the part of the permanent magnets (140) extending into the second region (132) is A, the maximum magnetic flux allowed to pass through the leakage magnetic path formed between each two adjacent spoke ribs (120) and the cylinder (110) is B, and A is greater than B. The spoke rib (120) comprises a first extension (121) and a second extension (122) connected in sequence along the radial direction, the second extension (122) is fixedly connected with the cylinder (110), the first extension (121) is located at one end of the second extension (122) away from the cylinder (110), and the width of the first extension (121) around the axial direction is greater than the width of the second extension (122) around the axial direction.

2. The spoked rotor assembly of claim 1, wherein, The first region (131) is formed between two first extensions (121) between each two adjacent spoke ribs (120), and the second region (132) is formed between two second extensions (122) between each two adjacent spoke ribs (120).

3. The spoked rotor assembly of claim 1 wherein, The side wall of the first extension (121) around the axial direction is fixedly connected with the permanent magnet (140). The side wall of the first extension (121) around the axial direction has a stop protrusion (1211) located at one end of the first extension (121) away from the second extension (122), and the stop protrusion (1211) is used for stopping and fixing the permanent magnet (140) along the radial direction.

4. The spoked rotor assembly of claim 3, wherein, The spoke rotor assembly is combined with a stator assembly (200). ​ 5. A permanent magnet synchronous motor characterized by, ​ The stator assembly (200) comprises a stator core (210) and a coil winding (220), the stator core (210) is in a cylindrical shape, the stator core (210) is sleeved on the outer periphery of the spoke rotor assembly along the axial direction, the inner cavity wall of the stator core (210) is provided with a plurality of stator teeth (2111), the plurality of stator teeth (2111) are arranged in a circumferential interval, each stator tooth (2111) extends along the radial direction, and the coil winding (220) comprises a plurality of coil units, and each stator tooth (2111) clamps and fixes one coil unit.

6. The permanent magnet synchronous motor of claim 5, wherein, The coil unit is formed by winding a wire (300) on the stator tooth (2111), the cross section of the wire (300) is a rectangle, the length-width ratio of the rectangle is K, the K is greater than or equal to 0.5 and less than or equal to 2, and the contact between adjacent two turns of wires in the coil unit is surface contact.

7. The permanent magnet synchronous motor of claim 6, wherein, The surface of the wire (300) is coated with an insulating layer, and the thickness of the insulating layer is 20-30μm. And / or, the corners of the wire (300) have a first chamfer, and the chamfer radius of the first chamfer is 0.1-0.5mm.

8. The permanent magnet synchronous motor of claim 5, wherein, The stator core (210) comprises: a plurality of core units (211), each core unit (211) has the stator tooth (2111), and the plurality of core units (211) are arranged in sequence along the axial direction in the state that the stator tooth (2111) faces the axial center of the axial direction; and a plurality of insulation skeletons (212), the surface of the stator tooth (2111) in each core unit (211) is covered with one insulation skeleton (212), and the insulation skeleton (212) is configured to be in contact with the coil unit.

9. The permanent magnet synchronous motor of claim 8, wherein, The insulation skeleton (212) is provided with a wire passing gap (2121) for accommodating the wire inlet of the coil unit; The corners of the insulation skeleton (212) have a second chamfer, and the chamfer radius of the second chamfer is not less than 0.5mm.

10. Scooter, characterized in that The vehicle comprises a vehicle frame (1010), a vehicle wheel (1020), a transmission structure (1030) and the permanent magnet synchronous motor according to any one of claims 5-9, the vehicle wheel (1020), the transmission structure (1030) and the permanent magnet synchronous motor are all mounted on the vehicle frame (1010), the output end of the permanent magnet synchronous motor is connected with the input end of the transmission structure (1030), the output end of the transmission structure (1030) is connected with the vehicle wheel (1020), and the permanent magnet synchronous motor is configured to drive the vehicle wheel (1020) to rotate.

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