Magnetic steel, secondary assembly, linear motor, suspension structure and vehicle

Abstract

This application discloses a magnet, a secondary component, a linear motor, a suspension structure, and a vehicle, relating to the field of vehicle technology, and aims to solve the problem of magnetic sheet detachment in spliced ​​magnets. The magnet is used in a motor and includes a first magnetic sheet, a second magnetic sheet, and a third magnetic sheet arranged circumferentially thereon. The second magnetic sheet is disposed between the first and third magnetic sheets and has a first outer wall surface. In the orthographic projection of the magnet onto a first plane, the distance from one end of the inner wall surface of the first magnetic sheet near the second magnetic sheet to the end of the inner wall surface of the third magnetic sheet near the second magnetic sheet is less than the distance between the two endpoints of the first outer wall surface. The first plane is perpendicular to the axis of the magnet. Alternatively, in the orthographic projection of the magnet onto the first plane, the inner wall surfaces of the second magnetic sheet, the first connector, and the second connector form a first arc segment; the first outer wall surface forms a second arc segment; the first and second arc segments are concentrically arranged, and the length of the second arc segment is greater than the length of the first arc segment.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to magnets, secondary components, linear motors, suspension structures, and vehicles. Background Technology

[0002] With the gradual development of technology, the performance improvement of electric motors, as a key component of vehicles, has become a crucial factor in improving vehicle efficiency.

[0003] An electric motor consists of a mover and a stator, with the mover comprising magnets. To improve motor performance, larger magnets are typically required to increase magnetic conductivity. In related technologies, modular magnet rings are usually composed of multiple separately arranged magnetic sheets joined together.

[0004] However, in the process of using a magnet made up of multiple magnetic pieces, the magnetic pieces may fall off due to factors such as impact and vibration, causing abnormal operation of the motor. Summary of the Invention

[0005] The purpose of this application is to provide magnets, secondary components, linear motors, suspension structures, and vehicles, with the aim of solving the problem of magnet sheet detachment in spliced ​​magnets.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] In a first aspect, this application provides a magnet that can be used in a motor. The magnet includes a first magnetic sheet, a second magnetic sheet, and a third magnetic sheet arranged circumferentially thereon. The second magnetic sheet is disposed between the first and third magnetic sheets. The first and second magnetic sheets are connected by a first connector, and the second and third magnetic sheets are connected by a second connector. The second magnetic sheet has a first outer wall surface. In the orthographic projection of the magnet onto a first plane, the distance from one end of the inner wall surface of the first magnetic sheet near the second magnetic sheet to one end of the inner wall surface of the third magnetic sheet near the second magnetic sheet is a first distance. The distance between the two endpoints of the first outer wall surface is a second distance. The first distance is less than the second distance. The first plane is perpendicular to the axis of the magnet. Alternatively, in the orthographic projection of the magnet onto the first plane, the inner wall surfaces of the second magnetic sheet, the first connector, and the second connector form a first arc segment, and the first outer wall surface forms a second arc segment. The first and second arc segments are concentrically arranged, and the length of the second arc segment is greater than the length of the first arc segment.

[0008] When the distance between the inner wall surface of the first magnetic sheet near the end of the second magnetic sheet and the inner wall surface of the third magnetic sheet near the end of the second magnetic sheet is less than the distance between the two endpoints of the first outer wall surface, the first plane is perpendicular to the axis of the magnet, or the length of the second arc segment is greater than the length of the first arc segment, the first outer wall surface of the second magnetic sheet will not detach from between the first and third magnetic sheets, thereby preventing the second magnetic sheet from falling off and causing abnormal motor operation.

[0009] The first and second arc segments are concentrically arranged. Since the first arc segment is located on the projection of the inner wall surface of the magnet, and the second arc segment is located on the projection of the outer wall surface of the magnet, the concentric arrangement of the first and second arc segments allows the centers of the inner and outer wall surfaces of the magnet to coincide, thereby making the inner and outer circumferential surfaces of the magnet smoother and less prone to skewing and falling off.

[0010] In some embodiments, the magnet is a ring structure, the orthographic projection of the inner circumferential surface of the magnet onto the first plane is an inner circle, and the orthographic projection of the outer circumferential surface of the magnet onto the first plane is an outer circle, with the inner and outer circles being concentrically arranged.

[0011] This allows the annular magnet to be evenly distributed in the circumferential direction, reducing motor malfunctions caused by magnet imbalance during motor rotation.

[0012] In some embodiments, the thickness of the first connector is equal to the thickness of the second connector along the circumferential direction of the magnet.

[0013] Since the thickness of the first connector is equal to the thickness of the second connector, the first, second, and third magnetic sheets can be evenly distributed, and the connection strength between the first and second magnetic sheets is equal to the connection strength between the second and third magnetic sheets, reducing the risk of one end of the second magnetic sheet falling off due to vibration and impact during motor operation.

[0014] In some embodiments, both the first connector and the second connector include an adhesive.

[0015] The adhesive connectors allow for the adaptation of magnetic sheets of various shapes and sizes, providing greater flexibility in connection. Furthermore, the adhesive connectors ensure a tight bond between adjacent magnetic sheets, reducing gaps and loosening in the mechanical connection and thus guaranteeing the strength of the connection.

[0016] In some embodiments, the first magnetic sheet and the third magnetic sheet are an integral structure. When the first magnetic sheet and the third magnetic sheet are an integral structure, the number of parts and installation steps can be reduced, and the second magnetic sheet can be directly installed between the first magnetic sheet and the third magnetic sheet, making installation simpler.

[0017] In other embodiments, the first and third magnetic sheets are separate structures. This allows for greater flexibility in the installation of the first, second, and third magnetic sheets and reduces the likelihood of interference from other structures.

[0018] In some embodiments, when the first connector and / or the second connector detach, a portion of the second magnet extends beyond the inner wall surface of the first magnet and / or the third magnet.

[0019] Secondly, this application also provides a secondary component, which may include the aforementioned magnet.

[0020] In some embodiments, the secondary component may include a plurality of magnets, which are stacked sequentially along the axial direction of the magnets.

[0021] In this way, when the coil is energized, a magnetic field is generated between the coil and the multiple magnets. The Lorentz force of this magnetic field is directed along the axis of the magnets, thereby generating an interaction force along the axis of the magnets between the central component and the magnet mounting component. This force drives the central component and the magnet mounting component to move relative to each other along the axis of the magnets. Using multiple magnets can increase the magnitude of the driving force, thereby improving the motor performance.

[0022] In some embodiments, the secondary component further includes a magnet mounting element, wherein the magnet is disposed within the magnet mounting element.

[0023] Magnet mounting components can support and protect magnets, ensuring the connection strength and performance of magnets.

[0024] Thirdly, this application also provides a linear motor, which may further include the aforementioned secondary components.

[0025] In some embodiments, the linear motor further includes a primary component, a secondary component sleeved on the outer periphery of the primary component, and the secondary component is movable relative to the primary component along the axial direction of the magnet.

[0026] In some embodiments, an air gap exists between the primary component and the secondary component, the air gap being the distance between the inner circumferential surface of the magnet and the outer circumferential surface of the primary component. Along the radial direction of the magnet, the size of the air gap is a first spacing L, and the dimension d1 of the first connector and / or the second connector in the circumferential direction of the magnet satisfies the first spacing L:

[0027] This air gap allows for a clearance between the magnet and the primary component, reducing friction caused by the mutual movement between the primary and secondary components. By limiting the size d1 of the first gap, the second magnet is positioned, thereby limiting its displacement distance and preventing it from easily detaching from the first gap, thus avoiding motor malfunctions caused by magnet detachment.

[0028] In some embodiments, when the second magnetic sheet extends beyond the inner wall surface of the first magnetic sheet and / or the third magnetic sheet, the maximum distance between the first outer wall surface and the outer wall surface of the first magnetic sheet and / or the third magnetic sheet in the radial direction of the magnet is the second distance H, where H < L.

[0029] In this way, there is at least a gap (LH) between the first inner wall surface and the primary component, and the second magnetic sheet will not come into contact with the primary component, so there will be no scratching. This can avoid abnormal noise and abnormal operation caused by scratching, and improve the reliability and safety of motor use.

[0030] In some embodiments, the second magnetic sheet of the magnet has a first position. When the second magnetic sheet is in the first position, the first inner wall surface is located on the same arc surface as the inner wall surface of the first magnetic sheet and the inner wall surface of the third magnetic sheet, and the minimum distance d2 between the second magnetic sheet and the magnet mounting component is less than or equal to the first distance L.

[0031] By limiting the minimum distance d2 between the second magnet and the magnet mounting component, the support stability of the magnet mounting component for the second magnet can be improved, the degree of offset of the second magnet relative to the first magnet can be reduced, thereby reducing the possibility of magnet failure or detachment.

[0032] In some embodiments, the second magnetic sheet of the magnet has a first position. When the second magnetic sheet is in the first position, the first inner wall surface is located on the same arc surface as the inner wall surface of the first magnetic sheet and the inner wall surface of the third magnetic sheet, and the minimum distance d2 between the second magnetic sheet and the magnet mounting component satisfies: 0.25L≤d2≤1.25L.

[0033] In this way, by ensuring that 0.25L≤d2≤1.25L, the support stability of the magnet mounting component on the first magnet can be further improved, the degree of offset of the second magnet relative to the first magnet can be reduced, thereby reducing the possibility of the magnet scraping against the stator.

[0034] In some embodiments, the primary component includes a center member and a winding assembly sleeved on the center member; the winding assembly cooperates with a magnet to drive the secondary component to move relative to the primary component.

[0035] Fourthly, this application also provides a suspension structure that may include the aforementioned linear motor.

[0036] In some embodiments, the suspension structure further includes a wishbone and a top cover, the wishbone being connected to a secondary component and the top cover being connected to a primary component. This allows the motor to be connected to other components, such as the vehicle body and wheels, via the wishbone and top cover, facilitating connection between the motor and other components.

[0037] In some embodiments, the suspension structure further includes a lower support and an elastic element, the lower support being fixedly disposed on the secondary assembly, and the elastic element being disposed between the lower support and the top cover.

[0038] When the linear motor adjusts the relative displacement between the top cover and the fork arm, the elastic element will extend and retract with the relative movement of the top cover and the fork arm, thereby adjusting the cushioning performance of the elastic element so that the cushioning performance of the elastic element meets the cushioning requirements of the vehicle, thereby further improving the driving comfort of the vehicle.

[0039] Fifthly, this application also provides a vehicle that may include the aforementioned magnet, secondary components, linear motor, or suspension structure.

[0040] It should be noted that the technical effects brought about by the implementation methods of the second to fifth aspects can all be referred to the technical effects brought about by the corresponding implementation methods in the first aspect, and will not be repeated here. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments 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.

[0042] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of this application;

[0043] Figure 2 for Figure 1 A front view schematic diagram of the suspension structure in the vehicle shown;

[0044] Figure 3 for Figure 2 A schematic diagram of the AA section cross-section of the suspension structure shown.

[0045] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B;

[0046] Figure 5 This is a schematic diagram of the structure of a magnet provided in an embodiment of this application;

[0047] Figure 6 A partial schematic diagram of a secondary component provided in an embodiment of this application;

[0048] Figure 7 for Figure 6 The diagram shows a partial view of the secondary component when the magnet connection fails.

[0049] Figure 8 for Figure 7 A magnified view of the second magnetic sheet during displacement;

[0050] Figure 9 A simulation diagram of the magnetic flux density distribution of the magnet at the first size, provided in an embodiment of this application;

[0051] Figure 10 Simulation diagram of magnetic flux density distribution of the magnet and air gap in the first dimension provided in the embodiments of this application;

[0052] Figure 11 Simulation diagram of magnetic flux density distribution of the magnet in the second dimension provided in the embodiments of this application;

[0053] Figure 12Simulation diagram of magnetic flux density distribution of the magnet and air gap in the second dimension, provided for embodiments of this application;

[0054] Figure 13 Simulation diagram of magnetic flux density distribution of the magnet in the second dimension provided in the embodiments of this application;

[0055] Figure 14 Simulation diagram of magnetic flux density distribution of the magnet and air gap in the second dimension, provided for embodiments of this application;

[0056] Figure 15 The air gap magnetic flux density distribution curves of the magnet provided in the embodiments of this application at 0.1 mm on the outer diameter side under the first, second and third dimensions.

[0057] Figure label:

[0058] 1000, Vehicle; 100, Body; 200, Wheel; 300, Suspension Structure; 10, Linear Motor; 20, Wishbone; 30, Top Cover; 40, Elastic Element;

[0059] 1. Magnet mounting components; 11. Lower support;

[0060] 2. Secondary component; 21. Magnet; 211. First magnetic sheet; 212. Second magnetic sheet; 213. Third magnetic sheet; 214. First gap; 215. Second gap; 216. First inner wall surface; 217. First outer wall surface; C. First position; D. Second position; a. First distance; b. Second distance;

[0061] 3. Central component;

[0062] 4. Primary component; 4A. Winding assembly; 41. Core; 411. Mounting hole; 42. Coil; 43. Receiving slot. Detailed Implementation

[0063] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0064] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-described orientation can be flexibly set in practical applications, provided that the relative positional relationship shown in the accompanying drawings is satisfied.

[0065] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0066] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0067] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0068] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0069] This application provides a vehicle 1000. The vehicle 1000 can be a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, a range-extended electric vehicle, a gasoline-powered vehicle, etc. The vehicle 1000 can also be a sedan, truck, bus, lorry, trailer, etc.

[0070] Please see Figure 1 , Figure 1 This is a structural schematic diagram of a vehicle 1000 provided for some embodiments of this application. The vehicle 1000 includes a body 100 and wheels 200. The body 100 is used for passengers and for carrying goods, and the wheels 200 are mounted under the body 100 to support the body 100 and are able to roll on the road surface so that the vehicle 1000 can move.

[0071] The vehicle 1000 also includes a suspension structure 300. The suspension structure 300 is located between the body 100 and the wheel 200 and is used to transmit the forces and torques acting between the body 100 and the wheel 200, as well as to buffer the impact forces on the body 100 during the driving of the vehicle 1000, so as to ensure that the vehicle 1000 drives smoothly.

[0072] Among them, the suspension structure 300 can be a non-independent suspension structure, an independent suspension structure, or an active suspension structure.

[0073] In some embodiments of this application, the suspension structure 300 is an active suspension structure. The stiffness and damping characteristics of the active suspension structure are dynamically and adaptively adjusted according to the driving conditions of the vehicle 1000 (such as the motion state of the vehicle 1000 and the road conditions) to ensure that the suspension structure 300 is always in the optimal damping state. For details, please refer to [link to relevant documentation]. Figure 2 , Figure 2 for Figure 1 The diagram shows a front view of the suspension structure 300 in the vehicle 1000. The suspension structure 300 may include a linear motor 10, a wishbone 20, a top cover 30, a lower support 11, and an elastic element 40. In some other examples, the suspension structure 300 may not include the lower support 11 and the elastic element 40.

[0074] The fork arm 20 and the top cover 30 are respectively connected to the opposite ends of the linear motor 10. The linear motor 10 is used to drive the fork arm 20 and the top cover 30 to move relative to each other in a direction away from or close to each other, so as to adjust the relative displacement between the top cover 30 and the fork arm 20.

[0075] One of the fork arm 20 and the top cover 30 is connected to the vehicle body 100, and the other of the fork arm 20 and the top cover 30 is connected to the wheel 200. That is, if the fork arm 20 is connected to the vehicle body 100, then the top cover 30 is connected to the wheel 200; if the fork arm 20 is connected to the wheel 200, then the top cover 30 is connected to the vehicle body 100.

[0076] In this way, by adjusting the relative displacement between the top cover 30 and the fork arm 20 through the linear motor 10, the relative displacement between the vehicle body 100 and the wheel 200 can be adjusted. Thus, when encountering uneven roads or turns, the distance between the vehicle body 100 and the wheel 200 can be adjusted through the linear motor 10 to maintain the balance of the vehicle body 100 and improve the driving comfort of the vehicle 1000.

[0077] Please continue reading. Figure 2 The linear motor 10 includes a secondary component 2, with a lower support 11 fixedly mounted on the secondary component 2. For example, the secondary component 2 can be a mover component. The secondary component 2 includes a magnet mounting member 1, with the lower support 11 fixedly mounted on the outer peripheral wall of the magnet mounting member 1. An elastic element 40 is disposed between the lower support 11 and the top cover 30. Specifically, the elastic element 40 abuts against both the lower support 11 and the top cover 30, meaning the elastic element 40 is in a compressed state under the clamping of the lower support 11 and the top cover 30. The elastic element 40 may or may not be connected to the magnet mounting member 1 and the top cover 30.

[0078] When the linear motor 10 adjusts the relative displacement between the top cover 30 and the fork arm 20, the elastic element 40 will extend and retract with the relative movement of the top cover 30 and the fork arm 20, thereby adjusting the buffering performance of the elastic element 40 so that the buffering performance of the elastic element 40 meets the buffering requirements of the vehicle 1000, thereby further improving the driving comfort of the vehicle 1000.

[0079] For example, the elastic element 40 can be a spring, a rubber column, a latex column, etc. This application uses the elastic element 40 as an example of a spring.

[0080] Please see Figure 3 , Figure 3 for Figure 2 The schematic diagram of the suspension structure 300 shown is a cross-sectional view at section AA. The linear motor 10 includes a secondary component 2 and a primary component 4. For example, the secondary component 2 can be a mover component, and the primary component 4 can be a stator component. The secondary component 2 is sleeved on the outer periphery of the primary component 4, and the secondary component 2 can move relative to the primary component 4 along the axial direction of the linear motor 10. The fork arm 20 is connected to the secondary component 2, and the top cover 30 is connected to the primary component 4. By moving the secondary component 2 relative to the primary component 4 along the axial direction of the linear motor 10, the fork arm 20 and the top cover 30 can be driven to move relative to each other along the axial direction of the linear motor 10, thereby adjusting the relative displacement between the vehicle body 100 and the wheel 200, and the cushioning performance of the elastic element 40.

[0081] Please continue reading. Figure 3The primary component 4 includes a central member 3 and a winding assembly 4A. A portion of the central member 3 is located within the magnet mounting component 1, and the central member 3 is capable of sliding relative to the magnet mounting component 1 along its axial direction. Specifically, a linear bearing can be provided at the port of the magnet mounting component 1, and the central member 3 is slidably connected to the linear bearing. The central member 3 can be a rod-shaped structure, a plate-shaped structure, or other irregular structures, etc., and is not specifically limited here. This application uses a rod-shaped structure as an example for illustration.

[0082] In some embodiments, the magnet mounting component 1 may be columnar or cylindrical; for example, the magnet mounting component 1 may include a housing.

[0083] The winding assembly 4A is sleeved on the center member 3. That is, the winding assembly 4A is connected to the center member 3 and is arranged along the circumference of the center member 3. For details, please refer to [link to relevant documentation]. Figure 4 , Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point B. The winding assembly 4A includes an iron core 41 and a coil 42. The iron core 41 has a mounting hole 411, the axis of which is aligned with the axis of the magnet mounting component 1. The center component 3 passes through the mounting hole 411 and is connected to the iron core 41.

[0084] Specifically, the portion of the center component 3 located within the magnet mounting component 1 passes through the mounting hole 411. The center component 3 can be interference-fitted with the iron core 41, or two limiting components, such as limiting protrusions or limiting bolts that can move along the axial direction of the magnet mounting component 1, can be provided on the center component 3. The iron core 41 is placed between the two limiting components, and the iron core 41 is clamped by the two limiting components to connect the iron core 41 to the center component 3.

[0085] In some examples, the winding assembly 4A includes multiple iron cores 41. The multiple iron cores 41 are arranged along the axial direction of the iron cores 41 (i.e., the axial direction of the magnet mounting member 1). In this case, the multiple iron cores 41 can be brought into contact sequentially, and then the multiple iron cores are placed between two limiting members, which fix the multiple iron cores 41 to the center member 3.

[0086] A receiving groove 43 is formed between two adjacent iron cores 41, and a coil 42 is housed within the receiving groove 43. The receiving groove 43 extends circumferentially along the mounting hole 411. There can be one or more coils 42. This application illustrates an example with multiple coils 42. A receiving groove 43 is formed between any two adjacent iron cores 41, meaning there are multiple receiving grooves 43, and one coil 42 is housed within one receiving groove 43. The coil 42 extends circumferentially along the mounting hole 411.

[0087] In some other examples, the primary component 4 may also include a core 41 that extends axially along the magnet mounting 1 and has a plurality of receiving slots 43 spaced apart axially along the magnet mounting 1, in which the coil 42 is received.

[0088] Please continue reading. Figure 4 The secondary component 2 also includes a magnet 21. The magnet 21 is fixedly disposed within the magnet mounting component 1 and surrounds the primary component 4; that is, the magnet 21 is located between the magnet mounting component 1 and the primary component 4. The magnet 21 can be a ring-shaped structure, with the iron core 41 and the coil 42 passing through it. For example, the magnet 21 can be a permanent magnet, an electromagnet, or a current-carrying coil.

[0089] In some examples, there are multiple magnets 21. Multiple magnets 21 are stacked sequentially along the axial direction of the magnets 21.

[0090] With the above-described configuration, after the coil 42 is energized, a magnetic field is generated between the coil 42 and the magnet 21. The direction of the Lorentz force of this magnetic field is along the axial direction of the magnet 21. This generates an interaction force along the axial direction of the magnet 21 between the center member 3 and the magnet mounting member 1, thereby pushing the center member 3 and the magnet mounting member 1 to move relative to each other along the axial direction of the magnet 21. Furthermore, the direction of the interaction force between the center member 3 and the magnet mounting member 1 can be controlled by changing the direction of the current flow in the coil 42.

[0091] Based on this, please continue to refer to Figure 3 The top cover 30 is connected to the center component 3. Specifically, the top cover 30 and the center component 3 are connected to the portion located on the outer side of the magnet mounting component 1. The top cover 30 and the center component 3 can be connected by welding, snap-fitting, screwing, or other means, and are not specifically limited here.

[0092] The fork arm 20 is connected to the magnet mounting component 1. Specifically, the fork arm 20 is connected to the end of the magnet mounting component 1 that faces away from the top cover 30. The fork arm 20 and the magnet mounting component 1 can be connected by welding, snap-fitting, screwing, or other means, and are not specifically limited here.

[0093] By sliding the magnet mounting part 1 relative to the center part 3, the top cover 30 and the fork arm 20 can be moved relative to each other, thereby adjusting the relative displacement between the top cover 30 and the fork arm 20, and thus adjusting the distance between the vehicle body 100 and the wheel 200. Furthermore, when the magnet mounting part 1 and the center part 3 slide relative to each other, the magnet mounting part 1 and the top cover 30 also move relative to each other, thereby causing the elastic element 40 to extend and retract, thus adjusting the cushioning performance of the elastic element 40.

[0094] This application uses a radially magnetized annular magnet as an example for illustration.

[0095] Currently, most of the ring magnets on the market are not large in size or have low magnetic performance requirements. Under these conditions, integral molding can meet the corresponding usage requirements.

[0096] As motor performance improves, the performance requirements for magnet 21 also increase. For ring magnet 21 with a large diameter, for example, the diameter of ring magnet 21 is greater than 80mm. It is difficult to form the entire magnet 21 in one piece, resulting in a low yield. Furthermore, the magnetic properties of magnet 21, such as coercivity, are difficult to meet the high performance requirements. Therefore, segmented splicing of ring magnet 21 has become a necessary technical approach.

[0097] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of a magnet 21 provided in an embodiment of this application. The magnet 21 may include multiple magnetic sheets arranged circumferentially, and each magnetic sheet has an arc-shaped structure. The arc-shaped structure of the magnetic sheets facilitates the splicing of multiple magnetic sheets circumferentially to form a ring magnet 21, thereby connecting the magnet 21 between the magnet mounting component 1 and the primary component 4, so that a magnetic field is generated between the magnet 21 and the coil, which in turn provides driving force to the motor, causing the central component 3 to move relative to the magnet mounting component 1.

[0098] Please refer to Figure 6 , Figure 6 This is a partial schematic diagram of a secondary component 2 provided in an embodiment of this application. In some embodiments, any two adjacent magnetic sheets are connected by a connector.

[0099] The connector allows multiple magnetic sheets to be connected sequentially to form a ring magnet 21. The connection between adjacent magnetic sheets is guaranteed by the connector, so that the magnetic sheets are not easy to fall off when subjected to external force.

[0100] In one possible structural design, the connector can be a first adhesive. For example, the first adhesive can be an epoxy resin adhesive, a polyurethane adhesive, an acrylic structural adhesive, or a silicone adhesive.

[0101] The first adhesive component allows for the connection of magnetic sheets of various shapes and sizes, making the connection more flexible. Furthermore, the first adhesive component tightly connects adjacent magnetic sheets, reducing gaps and loosening in the mechanical connection, thereby ensuring the connection strength of the magnetic sheets.

[0102] In other possible structural designs, the connector can also be a snap-fit ​​connector, allowing adjacent magnetic sheets to snap together to form a ring-shaped magnet 21. The connector can also be a bolt or other connection structure, which this application does not further limit.

[0103] The magnet 21 is formed by connecting multiple magnetic sheets circumferentially. In actual use, due to factors such as impact and vibration generated by the operation of the vehicle 1000, the connection between the multiple magnetic sheets may fail, causing the magnetic sheets to fall off, resulting in the magnet 21 scraping against the primary component 4, increasing the running resistance of the motor, and even damaging the motor.

[0104] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 7 for Figure 6 The diagram shows a partial view of the secondary component 2 when the connection of magnet 21 fails. The magnet 21 may include a first magnetic sheet 211, a second magnetic sheet 212, and a third magnetic sheet 213, with the second magnetic sheet 212 disposed between the first magnetic sheet 211 and the third magnetic sheet 213. The connectors include a first connector and a second connector. The first magnetic sheet 211 and the second magnetic sheet 212 are connected via the first connector, and the second magnetic sheet 212 and the third magnetic sheet 213 are connected via the second connector.

[0105] In some embodiments, the second magnetic sheet 212 has a first outer wall surface 217. In the orthographic projection of the magnet 21 onto the first plane, the distance from the end of the inner wall surface of the first magnetic sheet 211 near the second magnetic sheet 212 to the end of the inner wall surface of the third magnetic sheet 213 near the second magnetic sheet 212 is a first distance a, and the distance between the two endpoints of the first outer wall surface 217 is a second distance b. The first distance a is less than the second distance b, and the first plane is perpendicular to the axis of the magnet.

[0106] When the first distance 'a' between the inner wall surface of the first magnetic sheet 211 and the second magnetic sheet 212 and the inner wall surface of the third magnetic sheet 213 and the second magnetic sheet 212 is less than the second distance 'b' between the two endpoints of the first outer wall surface 217, the first outer wall surface 217 will not detach from between the first magnetic sheet 211 and the third magnetic sheet 213, thereby preventing the second magnetic sheet 212 from falling off and causing abnormal motor operation.

[0107] In other embodiments, in the orthographic projection of the magnet 21 onto the first plane, the inner wall surfaces of the second magnet 212, the first connector, and the second connector form a first arc segment, and the first outer wall surface 217 forms a second arc segment; the length of the second arc segment is greater than the length of the first arc segment.

[0108] When the length of the second arc segment is greater than the length of the first arc segment, the first outer wall surface 217 will not detach from between the first magnetic piece 211 and the third magnetic piece 213, thereby preventing the second magnetic piece 212 from falling off and causing abnormal motor operation.

[0109] In some embodiments, the first arc segment and the second arc segment are concentrically arranged. Since the first arc segment is located on the projection of the inner wall surface of the magnet 21 and the second arc segment is located on the projection of the outer wall surface of the magnet 21, the concentric arrangement of the first arc segment and the second arc segment can make the centers of the inner wall surface and the outer wall surface of the magnet 21 coincide, thereby making the inner and outer peripheral surfaces of the magnet 21 smoother and less prone to skewing and falling off.

[0110] In some embodiments, the magnet 21 has a ring structure, the orthographic projection of the inner circumferential surface of the magnet 21 onto the first plane is an inner circle, and the orthographic projection of the outer circumferential surface of the magnet 21 onto the first plane is an outer circle, with the inner circle and the outer circle being concentrically arranged.

[0111] This allows the magnets 21 to be evenly distributed in the circumferential direction, reducing motor malfunctions caused by imbalance of the magnets 21 when the motor rotates.

[0112] Please continue to refer to Figure 6 and Figure 7 In some embodiments, a first gap 214 is provided between the first magnetic sheet 211 and the second magnetic sheet 212, and a second gap 215 is provided between the second magnetic sheet 212 and the third magnetic sheet 213. A first connector is disposed in the first gap 214 for connecting the first magnetic sheet 211 and the second magnetic sheet, and a second connector is disposed in the second gap 215 for connecting the second magnetic sheet 212 and the third magnetic sheet 213.

[0113] To prevent the second magnetic piece 212 from falling out between the first magnetic piece 211 and the third magnetic piece 213, the dimensions of the first gap 214 and the second gap 215 must be smaller than the dimensions of the second magnetic piece 212.

[0114] Specifically, the section of the inner circle located within the first gap 214 is the first sub-arc segment, and the section of the inner circle located within the second gap 215 is the second sub-arc segment. Along the radial direction of the magnet 21, the second magnetic sheet 212 has a first inner wall surface 216, and the orthographic projection of the first inner wall surface 216 on the first plane is the third sub-arc segment. The first sub-arc segment, the second sub-arc segment, and the third sub-arc segment together form the first arc segment.

[0115] Since the length of the first arc segment is less than the length of the second arc segment, the size of the first outer wall surface 217 of the second magnetic sheet 212 is less than the sum of the sizes of the first gap 214, the second gap 215 and the first inner wall surface 216. This can prevent the second magnetic sheet 212 from falling off toward the central axis of the magnet 21, thereby avoiding the second magnetic sheet 212 falling off and colliding with the primary component 4, causing abnormal motor operation.

[0116] In some embodiments, the thickness of the first connector is equal to the thickness of the second connector along the circumferential direction of the magnet.

[0117] Since the thickness of the first connector is equal to the thickness of the second connector, the first magnetic sheet 211, the second magnetic sheet 212 and the third magnetic sheet 213 can be evenly distributed, and the connection strength between the first magnetic sheet 211 and the second magnetic sheet 212 is equal to the connection strength between the second magnetic sheet 212 and the third magnetic sheet 213, reducing the risk of one end of the second magnetic sheet 212 falling off due to vibration and impact during motor operation.

[0118] In some embodiments, the first magnetic sheet 211 and the third magnetic sheet 213 are an integral structure. When the first magnetic sheet 211 and the third magnetic sheet 213 are an integral structure, the number of parts and installation steps can be reduced, and the second magnetic sheet 212 can be directly installed between the first magnetic sheet 211 and the third magnetic sheet 213, making installation simpler.

[0119] In other embodiments, the first magnetic sheet 211 and the third magnetic sheet 213 are separate structures. This provides greater flexibility in installing the first magnetic sheet 211, the second magnetic sheet 212, and the third magnetic sheet 213, and makes them less susceptible to interference from other structures.

[0120] Please continue to refer to Figure 6 and Figure 7 The second magnetic sheet 212 has a first position C and a second position D. When the second magnetic sheet 212 is located at the first position C, the first inner wall surface 216 is located on the same arc surface as the inner wall surface of the first magnetic sheet 211 and the inner wall surface of the third magnetic sheet 213. When the second magnetic sheet 212 is located at the second position D, along the radial direction of the magnet 21, the first outer wall surface 217 is located inside the outer wall surface of the first magnetic sheet 211 and inside the outer wall surface of the third magnetic sheet 213. Due to assembly errors of the magnet or displacement of the magnetic sheet during operation, the second magnetic sheet 212 may be located between the first position C and the second position D.

[0121] Wherein, the first inner wall surface 216, the inner wall surface of the first magnetic sheet 211, and the inner wall surface of the third magnetic sheet 213 are located on the same arc surface and can be completely coplanar; alternatively, the first inner wall surface 216, the inner wall surface of the first magnetic sheet 211, and the inner wall surface of the third magnetic sheet 213 are located on the same arc surface radially along the arc surface, and there is a small tolerance between the first inner wall surface 216, the inner wall surface of the first magnetic sheet 211, and the inner wall surface of the third magnetic sheet 213. For example, the distance between the first inner wall surface 216, the inner wall surface of the first magnetic sheet 211, and the inner wall surface of the third magnetic sheet 213 radially along the arc surface can be less than or equal to 30 μm, for example, the distance can be 10 μm, 16 μm, or 30 μm.

[0122] In some embodiments, from a processing perspective, the inner diameter of the magnet 21 can be greater than or equal to 80 mm. When the inner diameter of the magnet 21 is small, the magnet 21 can be integrally formed, which helps to improve processing efficiency. When the inner diameter of the magnet 21 is greater than or equal to 80 mm, it is difficult to use the integral forming process and the yield is low. Therefore, spliced ​​magnets 21 can be used to achieve higher performance.

[0123] In other embodiments, from a performance perspective, the inner diameter of the magnet 21 can also be less than 80mm. Compared with the integrally formed ring magnet 21, the spliced ​​magnet 21 can meet higher magnetic performance requirements.

[0124] In some embodiments, the central angles of the multiple magnetic sheets are all equal. Since the multiple magnetic sheets are arranged circumferentially along the magnet 21 to form a ring magnet 21, and the radii of the inner and outer walls of the multiple magnetic sheets are all equal, the central angles of the multiple magnetic sheets are also equal, ensuring that the shapes and sizes of the multiple magnetic sheets are uniform. This results in more uniform magnetic properties of the spliced ​​magnet 21, thereby making the motor operation more stable.

[0125] Meanwhile, since the central angles of multiple magnetic sheets are equal, multiple magnetic sheets of the same size can be produced using a single mold during the processing of the magnetic sheets, and then spliced ​​together to form a ring magnet. This reduces the processing difficulty and saves processing costs.

[0126] Since the central angles of the multiple magnetic pieces are all equal, the size of the central angle depends on the number of magnetic pieces, i.e., θ = 360° / N, where N is the number of magnetic pieces in a single toroidal magnet 21. Please continue to refer to... Figure 6 and Figure 7 Due to factors such as impact and vibration, the second magnetic sheet 212 may shift relative to the first magnetic sheet 211 and the third magnetic sheet 213.

[0127] In one possible offset scheme, along the radial direction of the magnet 21, the second magnet 212 can be offset relative to the first magnet 211 to the side of the first outer wall surface 217 opposite to the first inner wall surface 216. At this time, the second magnet 212 is offset toward the magnet mounting part 1. Since the magnet mounting part 1 and the magnet 21 are relatively stationary, there will be no scratching between them.

[0128] In another possible offset scheme, along the radial direction of the magnet 21, the second magnet 212 can be offset relative to the first magnet 211 to the side of the first inner wall surface 216 opposite to the first outer wall surface 217.

[0129] In some embodiments, when the first connector and / or the second connector detach, a portion of the second magnet 212 extends beyond the inner wall surface of the first magnet 211 and / or the third magnet 213.

[0130] At this time, the second magnetic piece 212 is located between the first position C and the second position D, or the second magnetic piece 212 is located at the second position D.

[0131] Please continue to refer to Figure 4 , Figure 6 and Figure 8 , Figure 8 for Figure 7 The enlarged view of the second magnet 212 during displacement is shown. In some embodiments, there is an air gap between the primary component 4 and the secondary component 2. The air gap is the gap between the inner circumferential surface of the magnet 21 and the outer circumferential surface of the primary component 4.

[0132] This air gap allows the magnet 21 to maintain a gap with the primary component 4, reducing the friction caused by the mutual movement between the primary component 4 and the secondary component 2.

[0133] In some embodiments, the size of the air gap along the radial direction of the magnet 21 is a first spacing L, that is, the magnet 21 can be arranged around the primary component 4 of the motor and has a first spacing L between it and the primary component 4. The first spacing L can be the average value of the spacing between the inner wall surfaces of the plurality of magnets and the primary component 4.

[0134] The dimension d1 of the first or second connector in the circumferential direction of the magnet satisfies the following condition with respect to the first spacing L: N is the number of magnetic sheets.

[0135] By limiting the dimension d1 of the first or second connector in the circumferential direction of the magnet, when the second magnetic piece 212 is in the second position D, the end of the second magnetic piece 212 facing the first magnetic piece 211 can contact the first magnetic piece 211 to limit the second magnetic piece 212, thereby limiting the displacement distance of the second magnetic piece 212 and thus preventing the second magnetic piece 212 from easily falling out of the first gap 214, so as to avoid motor failure caused by the magnetic piece falling out.

[0136] When the second magnet 212 is in the first position C, the angle between the line connecting the endpoint of the first outer wall surface 217 near the first magnet 211 and the endpoint of the first outer wall surface 217 near the first magnet 211 when the second magnet 212 is in the second position D, and the wall surface of the first magnet 211 near the second magnet 212, is equal to half the central angle of the second magnet 212. Therefore, When the second magnet 212 is in the second position D, the distance between the end point of the first outer wall surface 217 near the first magnet 211 and the end point of the outer wall surface of the first magnet 211 near the second magnet 212.

[0137] when When the second magnetic sheet 212 is in use, there will be no gap between it and the primary component 4. Therefore, the second magnetic sheet 212 will not scrape against the primary component 4, thereby avoiding abnormal noise and abnormal operation caused by scraping, and improving the reliability and safety of motor use.

[0138] In addition, since any two adjacent magnetic pieces are connected by the first connector, and both the first connector and the second connector can be the first adhesive, and the first connector is set in the first gap 214, limiting the dimension d1 of the first connector in the circumferential direction of the magnet can also limit the dimension of the first adhesive between the first magnetic piece 211 and the second magnetic piece 212, reducing the possibility of the magnet 21 failing or falling off due to the excessive thickness of the first adhesive.

[0139] In some embodiments, when the second magnetic sheet 212 extends beyond the inner wall surface of the first magnetic sheet 211 and / or the third magnetic sheet 213, the maximum distance between the first outer wall surface 217 and the outer wall surface of the first magnetic sheet 211 and / or the third magnetic sheet 213 in the radial direction of the magnet 21 is the second distance H.

[0140] At this time, when the second magnetic sheet 212 is located in the second position D, along the radial direction of the magnet 21, the first outer wall surface 217 is located inside the outer wall surface of the first magnetic sheet 211 and inside the outer wall surface of the third magnetic sheet 213. The distance between the first outer wall surface 217 and the outer wall surface of the first magnetic sheet 211 in the radial direction of the magnet 21 is the second distance H, which can satisfy: H < L.

[0141] In this way, there is at least a gap (LH) between the first inner wall surface 216 and the primary component 4, and the second magnetic sheet 212 will not contact the primary component 4, thus preventing scratching. This avoids abnormal noise and malfunctions caused by scratching, improving the reliability and safety of the motor. In some embodiments, the number N of magnetic sheets in the annular magnet 21 can be less than or equal to 36. If N > 36, it will increase the difficulty of splicing the magnetic sheets, reduce work efficiency, and result in poor quality of the finished product.

[0142] In some embodiments, the number N of magnetic sheets in the annular magnet 21 can be greater than or equal to 4. If N < 4, the size of a single magnetic sheet is large, the overall molding is difficult, the yield is low, and the magnetic properties are not easy to meet the requirements.

[0143] Therefore, having a number of magnetic sheets N greater than or equal to 4 and less than or equal to 36 can reduce the processing difficulty of magnet 21 and improve the quality of the finished product.

[0144] For example, the number of magnetic sheets can be 4, 10, 18, 24, 32 or 36, and this application does not further limit this.

[0145] Since the central angles of the multiple magnetic sheets are all equal, their shapes and sizes are also equal. Therefore, the inner diameter of the magnet 21 can be twice the radius of the first inner wall surface 216 of the second magnetic sheet 212. Because there may be small tolerances between the multiple magnetic sheets along the axial direction of the magnet 21, the inner diameter of the magnet 21 can be the average of twice the inner wall radii of the multiple magnetic sheets.

[0146] Please continue to refer to Figure 6 and Figure 7 In some embodiments of this application, when the first inner wall surface 216 is located on the same arc surface as the inner wall surface of the first magnetic sheet 211 and the inner wall surface of the third magnetic sheet 213, a gap is formed between the second magnetic sheet 212 and the magnet mounting member 1, and the second magnetic sheet 212 and the magnet mounting member 1 can be connected by the third connector.

[0147] The third connector can be a second adhesive to fix the magnet 21 to the magnet mounting part 1.

[0148] In some embodiments, the first adhesive member may be integrally formed with the second adhesive member.

[0149] In some embodiments, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting component 1 is less than or equal to the first distance L. By limiting the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting component 1, the support stability of the magnet mounting component 1 for the second magnetic sheet 212 can be improved, and the degree of displacement of the second magnetic sheet 212 relative to the first magnetic sheet 211 can be reduced. At the same time, limiting the minimum distance d2 can also limit the size of the second adhesive component to ensure the connection strength of the second adhesive component, thereby reducing the possibility of magnet 21 failure or detachment.

[0150] In some embodiments, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting component 1 can satisfy: 0.25L≤d2. This ensures the minimum size of the adhesive between the second magnetic sheet 212 and the magnet mounting component 1, ensuring that the second magnetic sheet 212 can be firmly connected to the magnet mounting component 1, ensuring connection strength, and thus reducing magnetic sheet failure or detachment.

[0151] In some embodiments, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting component 1 can satisfy: 0.25L≤d2≤1.25L. By limiting the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting component 1, d2≤1.25L can be achieved, which can limit the offset of the second magnetic sheet 212, thereby preventing the second magnetic sheet 212 from scratching the primary component 4.

[0152] In one embodiment, when the magnet 21 is of the first size, the number N of magnetic sheets in a single magnet 21 is 36, the dimension d1 of the first connector in the circumferential direction of the magnet is 0.18 mm, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting part 1 is 0.2 mm, and the first distance L is 0.25 mm.

[0153] Substituting these dimensional parameters into the formula mentioned above, we can satisfy... Either H < L or 0.25L ≤ d2 ≤ 1.25L can prevent magnet 21 from rubbing against primary component 4 when it is deflected.

[0154] Furthermore, when the magnet 21 meets the aforementioned dimensions, its surface magnetic flux fluctuation is relatively small, and its impact on motor performance and operating thrust fluctuation is within an acceptable range. Compared to integrally formed magnets, spliced ​​magnets 21 can effectively improve the temperature resistance of the finished magnet 21, enabling it to reach N48UH or even higher levels to meet the requirements of high thrust output in motors. It should be noted that surface magnetic flux refers to the magnetic induction intensity at a specific point on the surface of the magnet 21, also known as surface magnetic flux density.

[0155] For details, please refer to Figure 9 , Figure 9 This is a simulation diagram of the magnetic flux density distribution of the magnet 21 in the first size according to the embodiment of this application. When the color temperature of the magnet increases and approaches red, the magnetic field density distribution is relatively dense and the magnetic field strength is high. When the color temperature of the magnet decreases and approaches purple, the magnetic field density distribution is relatively sparse and the magnetic field strength is low.

[0156] Figure 9 The color temperature is highest at the junction a1 between two adjacent magnetic sheets in the central magnet. Based on the relationship between color temperature change and magnetic field density, the magnetic field density at junction a1 is 0.1342T, which is the maximum magnetic field density on the magnet. The color temperature is lowest at the middle part b1 of the central magnetic sheet. Based on the relationship between color temperature change and magnetic field density, the magnetic field density at this location is 0.0128T, which is the minimum magnetic field density on the magnet.

[0157] The fluctuations between the maximum and minimum values ​​are within a suitable range, having a relatively small impact on motor performance and operating thrust fluctuations, and can meet the performance requirements of the magnets and the motor.

[0158] Please refer to Figure 10 , Figure 10This is a simulation diagram of the magnetic flux density distribution of the magnet 21 and the air gap in the first dimension provided in this application embodiment. The diagram shows the magnetic flux density distribution under the interaction of the magnet's magnetic field and the air gap's magnetic field. When the magnetic flux density is 0, the magnet's magnetic field and the air gap's magnetic field completely cancel each other out, resulting in more stable motor performance. Similarly, when the color temperature of the magnetic flux density distribution diagram increases and approaches red, the magnetic field density distribution is relatively dense and the magnetic field strength is high. When the color temperature of the distribution diagram decreases and approaches purple, the magnetic field density distribution is relatively sparse and the magnetic field strength is low.

[0159] Figure 10 The color temperature is highest at the joint of two adjacent magnetic sheets in the medium magnet 21. Based on the correspondence between color temperature change and magnetic field density, the magnetic field density at the joint is 1.2947T, which is the maximum value of the magnetic field density. The minimum value of the magnetic field density is 0T.

[0160] The magnetic flux density fluctuations caused by the interaction between the magnetic field of the magnet and the air gap magnetic field are within a suitable range, and have little impact on the performance of the motor and the fluctuations in the operating thrust, thus meeting the performance requirements of the magnet and the motor.

[0161] Therefore, when the magnet 21 is of the first size, the magnetic field density fluctuation of the magnet 21 is within a suitable range, and the impact on the motor performance and operating thrust fluctuation is small, which can meet the performance requirements of the magnet 21 and the motor.

[0162] In another embodiment, when the magnet 21 is of the second size, the number N of magnetic sheets in a single magnet 21 is 8, the dimension d1 of the first connector in the circumferential direction of the magnet is 0.4 mm, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting part 1 is 0.5 mm, and the first distance L is 0.5 mm.

[0163] Substituting these dimensional parameters into the formula mentioned above, we can satisfy... Either H < L or 0.25L ≤ d2 ≤ 1.25L can prevent magnet 21 from rubbing against primary component 4 when it is deflected.

[0164] When the magnet 21 meets the above dimensions, the surface magnetic fluctuation of the magnet 21 is small, and the impact on motor performance and operating thrust fluctuation is within an acceptable range.

[0165] For details, please refer to Figure 11 , Figure 11 This is a simulation diagram of the magnetic flux density distribution of the magnet 21 in the second dimension provided in the embodiments of this application. Figure 11At the junction a2 of two adjacent magnetic sheets in the middle magnet 21, the color temperature is the highest. According to the correspondence between color temperature change and magnetic field density, the magnetic field density at junction a2 is 0.2253T, which is the maximum magnetic field density on the magnet. At the center b2 of the middle magnetic sheet in the magnet, the color temperature is the lowest. According to the correspondence between color temperature change and magnetic field density, the magnetic field density at this location is 0.0096T, which is the minimum magnetic field density on the magnet.

[0166] The fluctuations between the maximum and minimum values ​​are within a suitable range, having a relatively small impact on motor performance and operating thrust fluctuations, and can meet the performance requirements of the magnets and the motor.

[0167] Please refer to Figure 12 , Figure 12 This is a simulation diagram of the magnetic flux density distribution of the magnet 21 and the air gap in the second dimension, provided in the embodiments of this application. Figure 12 The color temperature is highest at the junction a2 of two adjacent magnetic sheets in the middle magnet 21. Based on the correspondence between color temperature change and magnetic field density, the magnetic field density at junction a2 is 1.2919T, which is the maximum value of the magnetic field density. The minimum value of the magnetic field density is 0T. The magnetic field of the magnet and the air gap magnetic field completely cancel each other out, resulting in more stable motor performance.

[0168] The magnetic flux density fluctuations caused by the interaction between the magnetic field of the magnet and the air gap magnetic field are within a suitable range, and have little impact on the performance of the motor and the fluctuations in the operating thrust, thus meeting the performance requirements of the magnet and the motor.

[0169] Therefore, when the magnet 21 is of the second size, the magnetic field density fluctuation of the magnet 21 is within a suitable range, and the impact on the motor performance and operating thrust fluctuation is small, which can meet the performance requirements of the magnet 21 and the motor.

[0170] In another embodiment, when the magnet 21 is of the third size, the number N of magnetic sheets in a single magnet 21 is 12, the dimension d1 of the first connector in the circumferential direction of the magnet is 1.0 mm, the minimum distance d2 between the second magnetic sheet 212 and the magnet mounting part 1 is 0.8 mm, and the first distance L is 1.2 mm.

[0171] Substituting these dimensional parameters into the formula mentioned above, we can satisfy... Either H < L or 0.25L ≤ d2 ≤ 1.25L can prevent magnet 21 from rubbing against primary component 4 when it is deflected.

[0172] Please refer to Figure 13 , Figure 13 This is a simulation diagram of the magnetic flux density distribution of the magnet 21 in the second dimension provided in the embodiments of this application. Figure 13At the junction a3 of two adjacent magnetic sheets in the central magnet 21, the color temperature is the highest. According to the correspondence between color temperature change and magnetic field density, the magnetic field density at junction a3 is 0.3734T, which is the maximum magnetic field density on the magnet. At the center b3 of the central magnetic sheet, the color temperature is the lowest. According to the correspondence between color temperature change and magnetic field density, the magnetic field density at this location is 0.0178T, which is the minimum magnetic field density on the magnet.

[0173] The fluctuations between the maximum and minimum values ​​are within a suitable range, having a relatively small impact on motor performance and operating thrust fluctuations, and can meet the performance requirements of the magnets and the motor.

[0174] Please refer to Figure 14 , Figure 14 This is a simulation diagram of the magnetic flux density distribution of the magnet 21 and the air gap in the second dimension, provided in the embodiments of this application. Figure 14 The color temperature is highest at the junction a3 between two adjacent magnetic sheets of the central magnet 21. Based on the correlation between color temperature change and magnetic field density, the magnetic field density at junction a3 is 1.2801T, which is the maximum value of the magnetic field density. The minimum magnetic field density is 0T. The magnetic field of the magnet and the air gap magnetic field completely cancel each other out, resulting in more stable motor performance.

[0175] The magnetic flux density fluctuations caused by the interaction between the magnetic field of the magnet and the air gap magnetic field are within a suitable range, and have little impact on the performance of the motor and the fluctuations in the operating thrust, thus meeting the performance requirements of the magnet and the motor.

[0176] Therefore, when the magnet 21 is of the third size, the magnetic field density fluctuation of the magnet 21 is within a suitable range, and the impact on the motor performance and operating thrust fluctuation is small, which can meet the performance requirements of the magnet 21 and the motor.

[0177] In summary, by adjusting the dimensional parameters N, d1, and d2 of the magnet 21, the dimensions of the magnet 21 can be made to meet the requirements. When H < L and 0.25L ≤ d2 ≤ 1.25L, the second magnet 212 will not rub against the primary component 4 when it is displaced relative to the first magnet 211, thereby improving the safety and reliability of the motor. Under these dimensional parameters, there will be a small decrease in magnetic flux density at the connection between adjacent magnets in the magnet 21, but this will not affect the operation of the motor and will meet the performance requirements of the magnet 21 and the motor.

[0178] Please refer to Figure 15 , Figure 15The air gap magnetic flux density distribution curves of the magnet 21 provided in this application embodiment are located at 0.1 mm on the outer diameter side under the first, second, and third dimensions. The curves show that there is a peak value in the magnetic flux density at the splicing gap of the magnet 21. The peak width and corresponding peak value can be adjusted by adjusting the dimensional parameters R1, R2, and d1 of the magnet 21. The smaller the peak width and the lower the peak value, the better the consistency of the magnet 21 and the smaller the impact on the motor's operating performance.

[0179] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0180] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A magnet for use in an electric motor, characterized in that, The magnet includes a first magnetic sheet (211), a second magnetic sheet (212), and a third magnetic sheet (213) arranged circumferentially thereon. The second magnetic sheet (212) is disposed between the first magnetic sheet (211) and the third magnetic sheet (213). The first magnetic sheet (211) and the second magnetic sheet (212) are connected by a first connector, and the second magnetic sheet (212) and the third magnetic sheet (213) are connected by a second connector. The second magnetic sheet (212) has a first outer wall surface (217). In the orthographic projection of the magnet onto the first plane, the distance from one end of the inner wall of the first magnetic sheet (211) near the second magnetic sheet (212) to one end of the inner wall of the third magnetic sheet (213) near the second magnetic sheet (212) is the first distance (a), and the distance between the two endpoints of the first outer wall (217) is the second distance (b). The first distance (a) is less than the second distance (b); the first plane is perpendicular to the axis of the magnet. or, In the orthographic projection of the magnet onto the first plane, the inner wall surfaces of the second magnetic sheet (212), the first connector, and the second connector form a first arc segment; the first outer wall surface (217) forms a second arc segment; the first arc segment and the second arc segment are concentrically arranged, and the length of the second arc segment is greater than the length of the first arc segment.

2. The magnet according to claim 1, characterized in that, The magnet has a circular ring structure. The orthographic projection of the inner circumferential surface of the magnet onto the first plane is an inner circle, and the orthographic projection of the outer circumferential surface of the magnet onto the first plane is an outer circle. The inner circle and the outer circle are concentrically arranged.

3. The magnet according to claim 1, characterized in that, Along the circumference of the magnet, the thickness of the first connector is equal to the thickness of the second connector.

4. The magnet according to claim 1, characterized in that, Both the first connector and the second connector include adhesive components.

5. The magnet according to claim 1, characterized in that, The first magnetic sheet (211) and the third magnetic sheet (213) are an integral structure; or, the first magnetic sheet (211) and the third magnetic sheet (213) are separate structures.

6. The magnet according to claim 4, characterized in that, When the first connector and / or the second connector detaches, a portion of the second magnetic piece (212) extends beyond the inner wall surface of the first magnetic piece (211) and / or the third magnetic piece (213).

7. A secondary component, characterized in that, Includes the magnet (21) according to any one of claims 1-6.

8. The secondary component according to claim 7, characterized in that, It includes a plurality of said magnets (21), which are stacked along the axial direction of said magnets (21).

9. The secondary component according to claim 7, characterized in that, It also includes a magnet mounting component (1), wherein the magnet (21) is disposed on the magnet mounting component (1).

10. A linear motor, characterized in that, It includes the magnet (21) of any one of claims 1-6 and / or the secondary component (2) of any one of claims 7-9.

11. The linear motor according to claim 10, characterized in that, The linear motor includes the secondary component (2) as described in any one of claims 7-9; and The primary component (4) is fitted around the outer periphery of the secondary component (2), and the secondary component (2) is movable relative to the primary component (4) along the axial direction of the magnet (21).

12. The linear motor according to claim 11, characterized in that, There is an air gap between the primary component (4) and the secondary component (2). The air gap is the gap between the inner circumferential surface of the magnet (21) and the outer circumferential surface of the primary component (4). The size of the air gap along the radial direction of the magnet (21) is a first spacing L. The dimension d1 of the first connector and / or the second connector in the circumferential direction of the magnet satisfies the following condition with respect to the first spacing L: The magnet is a ring-shaped magnet formed by connecting multiple magnetic sheets in sequence, where N is the number of magnetic sheets, and the multiple magnetic sheets include at least the first magnetic sheet (211), the second magnetic sheet (212), and the third magnetic sheet (213).

13. The linear motor according to claim 12, characterized in that, When the second magnetic sheet (212) extends beyond the inner wall surface of the first magnetic sheet (211) and / or the third magnetic sheet (213), the maximum distance between the first outer wall surface (217) and the outer wall surface of the first magnetic sheet (211) and / or the third magnetic sheet (213) in the radial direction of the magnet (21) is the second distance H, where H < L.

14. The linear motor according to claim 13, characterized in that, The second magnetic sheet (212) has a first position (C). When the second magnetic sheet (212) is located in the first position (C), the first inner wall surface (217) is located on the same arc surface as the inner wall surface of the first magnetic sheet (211) and the inner wall surface of the third magnetic sheet (213), and the minimum distance d2 between the second magnetic sheet (212) and the magnet mounting part (1) is less than or equal to the first distance L.

15. The linear motor according to claim 13, characterized in that, The second magnetic sheet (212) has a first position (C). When the second magnetic sheet (212) is located in the first position (C), the first inner wall surface (217), the inner wall surface of the first magnetic sheet (211), and the inner wall surface of the third magnetic sheet (213) are located on the same arc surface, and the minimum distance d2 between the second magnetic sheet (212) and the magnet mounting part (1) satisfies: 0.25L≤d2≤1.25L.

16. The linear motor according to claim 15, characterized in that, The primary component (4) includes a center component (3) and a winding assembly (4A) sleeved on the center component (3); The winding assembly (4A) cooperates with the magnet (21) to drive the secondary assembly (2) to move relative to the primary assembly (4).

17. A suspension structure, characterized in that, Includes the magnet (21) of any one of claims 1-6 and / or the secondary component (2) of any one of claims 7-9 and / or the linear motor (10) of any one of claims 10-16.

18. The suspension structure according to claim 17, characterized in that, The suspension structure includes a linear motor (10) as described in any one of claims 10-16, the linear motor (10) comprising a secondary component (2) and a primary component (4), and, Fork arm (20), the fork arm (20) is connected to the secondary component (2); Top cover (30), which is connected to the primary component (4).

19. The suspension structure according to claim 18, characterized in that, Also includes: The lower support (11) is fixedly disposed on the secondary component (2); An elastic element (40) is disposed between the lower support (11) and the top cover (30).

20. A vehicle, characterized in that, It includes the magnet (21) of any one of claims 1-6 and / or the secondary component (2) of any one of claims 7-9 and / or the linear motor (10) of any one of claims 10-16 and / or the suspension structure (300) of any one of claims 17-19.

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