Flexible circuit board winding and motor using the flexible circuit board winding

Abstract

This application discloses a flexible circuit board winding and a motor using the flexible circuit board winding. The flexible circuit board winding includes a phase coil group and two electrodes. The phase coil group includes multiple coil groups, multiple connectors, and multiple heat-conducting elements. Two coil groups located at their two edges along a predetermined direction are defined as the first coil group and the last coil group. The connectors are electrically connected between two adjacent coil groups. Each heat-conducting element and a connector are integrally formed or connected, and the heat-conducting elements can be connected to or in contact with an external heat-conducting structure to conduct heat from the coil group to the outside. The two electrodes are electrically connected to the first coil group and the last coil group, respectively. The phase coil groups can be wound, and at least two non-adjacent coil groups at least partially overlap radially along the annular structure, while any two heat-conducting elements at least partially do not overlap radially along the annular structure. The motor uses the aforementioned flexible circuit board winding. This configuration improves the heat dissipation efficiency of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a flexible circuit board winding and a motor using the flexible circuit board winding. Background Technology

[0002] Permanent magnet motors, including slotless permanent magnet motors, are characterized by their small size, light weight, and fast response speed, and can be used in the field of automatic control. A slotless permanent magnet motor includes a housing, windings, magnets, and end caps; the windings and magnets work together to enable the slotless permanent magnet motor to operate.

[0003] In slotless permanent magnet motors, the windings are typically made of enameled wire, and the insulating material on the surface of the enameled wire reduces the thermal resistivity of the conductor. Alternatively, when a slotless permanent magnet motor uses flexible circuit board windings (i.e., FPC windings), the surface of the flexible circuit board windings is coated with a polyimide coating for insulation during the manufacturing process, and this polyimide coating also reduces the thermal resistivity of the flexible circuit board windings.

[0004] In summary, since a decrease in thermal resistivity reduces the heat dissipation efficiency of the windings, the heat dissipation efficiency of the slotless permanent magnet motor will decrease, which in turn will affect the performance of the slotless permanent magnet motor during operation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a flexible circuit board winding and a motor using the flexible circuit board winding, which can improve the heat dissipation efficiency of the flexible circuit board winding.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A flexible circuit board winding includes a phase coil group and two electrodes.

[0008] The phase coil assembly includes multiple coil groups, multiple connectors, and multiple heat-conducting components. Each coil group includes at least two coils. The multiple coil groups are arranged along a predetermined direction, and the two coil groups located at the two edges along the predetermined direction are defined as the first coil group and the last coil group. The multiple connectors are electrically conductive and thermally conductive, and the connectors are electrically connected between two adjacent coil groups so that the two adjacent coil groups are connected in series. The multiple heat-conducting components are integrally formed or connected to a connector. The heat-conducting components are located on the side of the connector away from the coil group. The heat-conducting components can be connected to or in contact with an external heat-conducting structure to conduct the heat of the coil group to the outside. Two electrodes are electrically connected to the first coil group and the last coil group, respectively. The phase coil assembly can be wound so that the multiple coil groups are wound into a ring structure. At least two non-adjacent coil groups overlap at least partially along the radial direction of the ring structure, and any two heat-conducting components do not overlap at least partially along the radial direction of the ring structure.

[0009] Furthermore, at least three phase coil groups are provided so that the flexible circuit board winding is a multi-phase winding; one phase coil group is defined as the first phase coil group, and the other phase coil groups are defined as the second phase coil groups, and any one coil group of all the second phase coil groups is at least partially located in the interval formed by the first phase coil group; the multiple phase coil groups are wound so that the multiple phase coil groups form a ring structure, and any two heat-conducting elements do not overlap at least partially in the radial direction of the ring structure.

[0010] Furthermore, when multiple phase coil groups are wound, no two electrodes are in contact.

[0011] Furthermore, the heat-conducting component includes two sides radially distributed along the annular structure, and the phase coil assembly includes an insulating cover that wraps around one side of the connector and the heat-conducting component. The other side of the heat-conducting component can be exposed and connected or in contact with an external heat-conducting structure.

[0012] To achieve the above objectives, this application adopts the following technical solution:

[0013] An electric motor, which is a slotless permanent magnet motor, includes a stator core, a flexible circuit board winding, a permanent magnet rotor, and a heat-conducting structure. The stator core is axial and has heat dissipation through holes extending along its axial direction. The flexible circuit board winding is arranged around the stator core and in close contact with it. The heat-conducting element of the flexible circuit board is at least partially bent and located within the heat dissipation through holes. The permanent magnet rotor is arranged around the flexible circuit board winding and is spaced apart from it. The heat-conducting structure includes a heat-conducting shaft and a heat dissipation element connected to the heat-conducting shaft. The heat-conducting shaft is at least partially located within the heat dissipation through holes and is connected to or in contact with the heat-conducting element.

[0014] Furthermore, the heat sink includes an annular fixing part and heat sink fins fixed within the annular fixing part, the heat sink fins being connected to the heat-conducting shaft.

[0015] Furthermore, the annular fixing part is provided with cooling holes that penetrate the inner and outer diameter surfaces of the annular fixing part. The cooling holes can allow flowing air or coolant to pass through, so that the heat dissipation fins can be air-cooled or liquid-cooled.

[0016] Furthermore, air or coolant can be introduced between the outer and inner rings to enable the heat-conducting structure to achieve air or liquid cooling of the heat-conducting components.

[0017] To achieve the above objectives, this application adopts the following technical solution:

[0018] This application provides an electric motor, which is a slotless permanent magnet motor and includes a stator core, a flexible circuit board winding, a permanent magnet rotor, and a heat-conducting structure. The stator core is ring-shaped. The flexible circuit board winding is arranged around the stator core and in close contact with it. Along the radial direction of the stator core, the heat-conducting element of the flexible circuit board does not overlap with the stator core at least partially, so that the heat-conducting element extends to one side of the stator core along its axial direction. The permanent magnet rotor is shaft-shaped and is arranged around the flexible circuit board winding, with a gap between them. The heat-conducting structure includes an inner ring, and the heat-conducting element connects to or contacts the inner diameter surface of the inner ring.

[0019] Furthermore, the heat-conducting structure also includes an outer ring body and two end caps. The outer ring body and the inner ring body are coaxially arranged, and the outer ring body surrounds the inner ring body. The two end caps are respectively connected to the two sides of the inner ring body and the outer ring body.

[0020] Furthermore, the inner ring, outer ring, and two end caps enclose a cooling space. The outer ring has a through hole that connects to the cooling space, allowing flowing air or coolant to pass through, so that the inner ring can achieve air cooling or liquid cooling of the heat-conducting components.

[0021] The aforementioned flexible circuit board winding improves heat dissipation efficiency by placing heat-conducting components between adjacent coil groups, allowing the winding to transfer heat to the outside. This, in turn, enhances the overall heat dissipation efficiency of the motor. Furthermore, the fact that any two heat-conducting components do not overlap at least partially radially along the annular structure prevents interference during heat conduction, further improving their heat dissipation efficiency and thus enhancing the overall heat dissipation efficiency of the flexible circuit board winding, ultimately leading to improved motor heat dissipation efficiency. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the flexible circuit board winding according to an embodiment of this application.

[0023] Figure 2 This is a structural diagram of the flexible circuit board winding during the winding process according to an embodiment of this application.

[0024] Figure 3 This is a structural diagram of the flexible circuit board winding in an embodiment of this application when it is a three-phase winding.

[0025] Figure 4 This is a structural diagram of the first type of motor according to an embodiment of this application.

[0026] Figure 5 This is an exploded view of the first type of motor according to an embodiment of this application.

[0027] Figure 6 This is a cross-sectional view of a second type of motor according to an embodiment of this application. Detailed Implementation

[0028] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0029] It should be noted that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. "A plurality of" indicates at least two. Unless otherwise stated, "left," "right," "lower," and / or "upper," and similar terms are for illustrative purposes only and are not limited to a location or spatial orientation. "Comprising," and similar terms mean that the element or object preceding "comprising" covers the element or object listed after "comprising" and its equivalents, but does not exclude other elements or objects. "Connected," "linked," and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0030] The singular forms “a,” “the,” and “the” used in this application specification and appended claims may also include one or more, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein describes the relationship between related objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural.

[0031] like Figure 1 and Figure 2 As shown, this application provides a flexible circuit board winding 100, which includes a phase coil group 11 and two electrodes 13, the two electrodes 13 being connected to the phase coil group 11. The phase coil group 11 is used to generate Lorentz force with a permanent magnet, and the electrodes 13 are used to connect the phase coil group 11 and an external circuit.

[0032] To clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The terms "up," "down," "left," and "right" are shown to indicate the top, bottom, left, and right sides of the flexible circuit board winding 100.

[0033] Specifically, the phase coil group 11 includes multiple coil groups 111, multiple connectors 1122, and multiple heat-conducting components 1121. Each coil group 111 includes at least two coils. The multiple coil groups 111 are arranged along a predetermined direction. The two coil groups 111 located at the two edges along the predetermined direction are defined as the first coil group 1111 and the last coil group 1112. Two electrodes 13 are electrically connected to the first coil group 1111 and the last coil group 1112, respectively. In the above configuration, when an external circuit is connected to the phase coil group 11 through the two electrodes 13, the entire phase coil group 11 can be made to work, thereby improving the power of the phase coil group 11.

[0034] In this application, the preset direction is the left-right direction of the flexible circuit board winding 100, that is, multiple coils are arranged along the left-right direction of the flexible circuit board winding 100. Each connector 1122 is used to connect two adjacent coil groups 111. The heat-conducting element 1121 can transfer heat from the coil group 111 to the outside through the connector 1122, thereby increasing the heat conduction of the phase coil group 11 within the same time period and improving the heat dissipation efficiency of the phase coil group 11.

[0035] Meanwhile, each connector 1122 is electrically and thermally conductive so that adjacent coil groups 111 can be connected when energized, thereby enabling the flexible circuit board winding 100 to be connected when energized, and allowing the heat of the coil group 111 to be transferred to the heat conductor 1121 through the connector 1122.

[0036] Specifically, each heat-conducting element 1121 and a connector 1122 are integrally formed or connected. Each connector 1122 is electrically connected between two adjacent coil groups 111 so that the two adjacent coil groups 111 are connected in series. The heat-conducting element 1121 is located on the side of the connector 1122 away from the coil group 111. The heat-conducting element 1121 can be connected to or in contact with the external heat-conducting structure 23 to conduct the heat of the coil group 111 to the outside.

[0037] With the above configuration, a heat-conducting element 1121 is provided between two adjacent coil groups 111, which can cool down each coil group 111, thereby cooling down the phase coil group 11 evenly to avoid large temperature differences at different positions of the phase coil group 11, which in turn helps to improve the power of the phase coil group 11.

[0038] It should be noted that this application does not restrict the connection method of the heat-conducting component 1121 and the connector 1122, as long as the heat-conducting component 1121 can transfer the heat of the flexible circuit board winding 100 to the outside.

[0039] In this embodiment, the phase coil group 11 can be wound such that multiple coil groups 111 are arranged in a ring structure 10, at least two non-adjacent coil groups 111 at least partially overlap in the radial direction of the ring structure 10, and any two heat-conducting elements 1121 at least partially do not overlap in the radial direction of the ring structure 10. With this arrangement, when the phase coil group 11 is wound into a flexible circuit board winding 100, since at least two non-adjacent coil groups 111 at least partially overlap in the radial direction of the ring structure 10, the phase coil group 11 is wound multiple times, which helps to increase the magnetic field strength of the flexible circuit board winding 100, thereby increasing the output power of the flexible circuit board winding 100. Furthermore, since any two heat-conducting elements 1121 do not overlap at least partially in the radial direction of the annular structure 10, it is also possible to prevent any two heat-conducting elements 1121 from covering each other during the process of transferring heat from the phase coil group 11 to the outside, thereby preventing the covered heat-conducting element 1121 from being unable to transfer heat to the outside, which can improve the heat conduction efficiency of the heat-conducting element 1121, so as to improve the heat dissipation efficiency of the flexible circuit board winding 100.

[0040] In summary, by providing heat-conducting elements 1121 between adjacent coil groups 111, heat within the phase coil group 11 can be transferred to the outside, thereby improving the heat dissipation efficiency of the flexible circuit board winding 100, which in turn improves the heat dissipation efficiency of the motor using the flexible circuit board winding 100. Simultaneously, after the phase coil group 11 is wound into a ring structure 10, any two heat-conducting elements 1121 do not overlap at least partially in the radial direction of the ring structure 10. This prevents any two heat-conducting elements 1121 from covering each other during the heat transfer process from the phase coil group 11 to the outside, thus preventing the covered heat-conducting element 1121 from being unable to transfer heat to the outside, further improving the heat conduction efficiency of the heat-conducting element 1121, and consequently improving the heat dissipation efficiency of the flexible circuit board winding 100, which in turn improves the heat dissipation efficiency of the motor using the flexible circuit board winding 100.

[0041] For example, if multiple slotless permanent magnet motors are distributed across multiple locations, and each slotless permanent magnet motor is an independent heat source, there will be a problem of high and dispersed heat density, making it impossible to achieve centralized heat dissipation for the multiple slotless permanent magnet motors. When the slotless permanent magnet motors use the flexible circuit board winding 100 of this application, the heat-conducting components 1121 in all slotless permanent magnet motors can be connected to the same heat dissipation device, so that the heat-conducting components 1121 can transfer the heat of the flexible circuit board windings 100 of the multiple slotless permanent magnet motors to the same heat dissipation device for heat dissipation, thereby improving the heat dissipation efficiency of the multiple slotless permanent magnet motors.

[0042] like Figure 1 and Figure 3As shown, at least three phase coil groups 11 are provided, making the flexible circuit board winding 100 a multi-phase winding. Each phase coil group 11 has a gap 113 between adjacent coil groups 111. One phase coil group 11 is defined as the first phase coil group, and the others are defined as second phase coil groups. Any coil group 111 of any second phase coil group is at least partially located within the gap formed by the first phase coil groups. The multiple phase coil groups 11 are wound to form a ring structure 10, where any two heat-conducting elements 1121 do not at least partially overlap radially along the ring structure 10. This arrangement allows the multi-phase winding to meet the operating requirements of a multi-phase motor. Furthermore, the above arrangement can also prevent any two heat-conducting elements 1121 from overlapping at least partially in the radial direction of the annular structure 10, thereby preventing any two heat-conducting elements 1121 from covering each other during the process of transferring heat from the phase coil group 11 to the outside, so as to avoid the covered heat-conducting element 1121 being unable to transfer heat to the outside, thereby improving the heat conduction efficiency of the heat-conducting element 1121, and thus improving the heat dissipation efficiency of the multiphase winding, thereby improving the heat dissipation efficiency of the motor using the flexible circuit board winding 100.

[0043] In this embodiment, when multiple phase coil groups 11 are wound, no two electrodes 13 are in contact. This arrangement prevents short circuits from occurring within any two flexible circuit board windings 100 or even a single flexible circuit board winding 100, thereby improving the safety of the multi-phase winding during operation.

[0044] like Figure 2 As shown, in one embodiment, the heat-conducting element 1121 includes two sides radially distributed along the annular structure 10. The phase coil assembly 11 includes an insulating cover 1123, which wraps around the connector 1122 and one side of the heat-conducting element 1121. The other side of the heat-conducting element 1121 can be exposed and connected to or in contact with the external heat-conducting structure 23. Figure 2The side of the heat-conducting element 1121 with the diagonal line drawn on it is the exposed side, while the side without the diagonal line is covered by an insulating cover 1123. Since the heat-conducting element 1121 is also conductive, and in the flexible circuit board winding 100 formed by the winding phase coil group 11, there may be overlap between any two heat-conducting elements 1121 or between the heat-conducting element 1121 and the electrode 13, the insulating cover 1123 prevents any two heat-conducting elements 1121 or between the heat-conducting element 1121 and the electrode 13, thereby preventing short circuits in the flexible circuit board winding 100 and improving the safety of the flexible circuit board winding 100 during operation. Meanwhile, the above arrangement allows the exposed side of the heat-conducting element 1121 to be connected to the heat-conducting structure 23, so that the heat-conducting element 1121 does not need to pass through the insulating cover 1123 when transferring heat to the heat-conducting mechanism, thereby avoiding the insulating cover 1123 from reducing the heat conduction efficiency of the heat-conducting element 1121, which can improve the heat dissipation efficiency of the flexible circuit board winding 100, thus improving the heat dissipation efficiency of the motor using the flexible circuit board winding 100.

[0045] In this application, the insulating cover 1123 is made of insulating material. By wrapping the insulating cover 1123 around one side of the heat-conducting element 1121 and the connector 1122, it is possible to prevent any two heat-conducting elements 1121 or the heat-conducting element 1121 from being connected to the electrode 13.

[0046] For example, the insulating cover 1123 may be alumina ceramic, aluminum nitride ceramic, polyesterimide, polyimide, polyamideimide, etc.

[0047] It should be noted that this application does not impose any restrictions on the specific materials and structure of the insulating cover 1123, as long as it meets the requirement of achieving the insulation effect.

[0048] like Figure 4 and 5 As shown, this application provides a motor 200, which is a slotless permanent magnet motor. It should be noted that the motor 200 of this application is a miniature slotless permanent magnet motor, wherein a miniature slotless permanent magnet motor refers to a slotless permanent magnet motor with a diameter not exceeding 160mm or a power not exceeding 750W.

[0049] The motor 200 includes a stator core 21, a flexible circuit board winding 100, a permanent magnet rotor 22, and a heat-conducting structure 23. The stator core 21 is disposed within the permanent magnet rotor 22 and is used for magnetic conduction. The flexible circuit board winding 100 is disposed between the stator core 21 and the permanent magnet rotor 22, and is used to generate a magnetic field in conjunction with the stator core 21 and interact with the permanent magnet rotor 22. The permanent magnet rotor 22 is used to provide power output for the motor 200. The heat-conducting structure 23 is connected to or in contact with the flexible circuit board winding 100 and is used to dissipate heat from the motor 200.

[0050] Specifically, the stator core 21 is axial, and the flexible circuit board winding 100 is arranged around the stator core 21 and in close contact with the stator core.

[0051] In addition, the permanent magnet rotor 22 has a ring structure and is arranged around the flexible circuit board winding 100, with a gap between it and the flexible circuit board winding 100.

[0052] Furthermore, the stator core 21 has a heat dissipation through-hole 211 extending along its axial direction, and the heat-conducting element 1121 of the flexible circuit board winding 100 is at least partially bent and located within the heat dissipation through-hole 211. The heat-conducting structure 23 includes a heat-conducting shaft 231 and a heat dissipation element 232 connected to the heat-conducting shaft 231. The heat-conducting shaft 231 is at least partially located within the heat dissipation through-hole 211 and is connected to or in contact with the heat-conducting element 1121. In this application, one exposed side of the heat-conducting element 1121 is connected to the heat-conducting shaft 231 to improve heat conduction efficiency. The side of the heat-conducting element 1121 with the insulating cover 1123 is connected to the stator core 21, thereby preventing the heat-conducting element 1121 from being electrically connected to the stator core 21. As described above, the efficiency of heat conduction from the flexible circuit board winding 100 to the outside can be improved by the heat-conducting element 1121, the heat-conducting shaft 231, and the heat-conducting structure 23, thereby improving the heat dissipation efficiency of the motor 200. Furthermore, in the above configuration, the heat from the flexible circuit board winding 100 can be transferred to the heat sink 232 through the heat conductor 1121 and the heat conductor shaft 231, and then the heat sink 232 transfers the heat to the outside, thereby keeping the heat transferred to the outside away from the motor 200, so as to avoid the motor 200 from having a short heat flow and thus improve the heat dissipation efficiency of the motor 200.

[0053] For example, silicone grease can be applied between the exposed side of the thermal conductive element 1121 and the thermal conductive shaft 231 to fill the gap between the exposed side of the thermal conductive element 1121 and the thermal conductive shaft 231, thereby reducing the thermal resistance between the thermal conductive element 1121 and the thermal conductive shaft 231, so as to facilitate the transfer of heat from the thermal conductive element 1121 to the thermal conductive shaft 231, thereby improving the heat dissipation efficiency of the flexible circuit board winding 100.

[0054] For example, the heat-conducting shaft 231 and the heat-conducting element 1121 can overlap and contact in the axial direction of the stator core 21, so that the heat-conducting element 1121 can transfer the heat of the flexible circuit board winding 100 to the outside through the heat-conducting shaft 231, thereby dissipating heat from the motor 200.

[0055] It should be noted that in this application, there are no restrictions on the connection or contact method between the heat-conducting shaft 231 and the heat-conducting element 1121, as long as the heat-conducting element 1121 can transfer heat to the outside through the heat-conducting shaft 231.

[0056] For example, the heat-conducting shaft 231 can be a ceramic rod. Since ceramic materials have high thermal conductivity, the efficiency of the heat-conducting component 1121 in transferring heat from the flexible circuit board winding 100 to the outside can be improved by using a ceramic rod, thereby improving the heat dissipation efficiency of the motor 200.

[0057] It should be noted that in this application, there are no restrictions on the material of the heat-conducting shaft 231, as long as it can improve the heat conduction efficiency of the heat-conducting component 1121 and has insulation properties.

[0058] In one embodiment, the heat sink 232 includes an annular fixing portion 2321 and heat sink fins 2322 fixed within the annular fixing portion 2321. The heat sink fins 2322 are connected to the heat-conducting shaft 231. Through this arrangement, the heat sink fins 2322 can increase the heat dissipation area of ​​the heat-conducting shaft 231, thereby improving the heat conduction efficiency of the heat-conducting shaft 231, which in turn improves the heat dissipation efficiency of the flexible circuit board winding 100, and consequently, the heat dissipation efficiency of the motor 200.

[0059] In one embodiment, the annular fixing part 2321 is provided with cooling holes 2321a that penetrate the inner and outer diameter surfaces of the annular fixing part 2321. The cooling holes 2321a allow flowing air or coolant to pass through, enabling the heat dissipation fins 2322 to be air-cooled or liquid-cooled. Through this arrangement, the flowing air or coolant can cool the heat dissipation fins 2322, maintaining them at a lower temperature and thus improving the thermal conductivity of the heat dissipation fins 2322, thereby enhancing the heat dissipation efficiency of the motor 200.

[0060] like Figure 6 As shown, this application embodiment provides a motor 300, which is a slotless permanent magnet motor. It should be noted that the motor 300 of this application is a miniature slotless permanent magnet motor, wherein a miniature slotless permanent magnet motor refers to a slotless permanent magnet motor with a diameter not exceeding 160mm or a power not exceeding 750W.

[0061] The motor 300 includes a stator core 31, a flexible circuit board winding 100, a permanent magnet rotor 32, and a heat-conducting structure 33. The stator core 31 is ring-shaped and used for magnetic circuit conduction. The flexible circuit board winding 100 is disposed between the stator core 31 and the permanent magnet rotor 32, generating a magnetic field and interacting with the permanent magnet rotor 32. The permanent magnet rotor 32 is disposed within the flexible circuit board winding 100 and drives the motor 300 to rotate. The heat-conducting structure 33 is connected to or in contact with the flexible circuit board winding 100 and is used to dissipate heat from the motor 300.

[0062] Specifically, the stator core 31 is annular, and the flexible circuit board winding 100 is arranged around the stator core 31. More specifically, along the radial direction of the stator core 31, the heat-conducting element 1121 of the flexible circuit board is at least partially non-overlapping with the stator core 31, such that the heat-conducting element 1121 extends to one side of the stator core 31 along its axial direction. In this application, the exposed side of the heat-conducting element 1121 is connected to the heat-conducting shaft 431 to improve heat conduction efficiency. The side of the heat-conducting element 1121 with the insulating cover 1133 is connected to the stator core 31, thereby preventing the heat-conducting element 1121 from being electrically connected to the stator core 31. Therefore, through the above arrangement, the heat-conducting element 1121 can transfer the heat of the flexible circuit board winding 100 to the outside, thereby improving the efficiency of heat conduction from the flexible circuit board winding 100 to the outside, which is beneficial to improving the heat dissipation efficiency of the motor 300.

[0063] In addition, the permanent magnet rotor 32 is an axial body, which is surrounded by the flexible circuit board winding 100, and there is a gap between the permanent magnet rotor 32 and the flexible circuit board winding 100.

[0064] Furthermore, the heat-conducting structure 33 includes an inner ring 331, and the heat-conducting element 1121 is connected to or in contact with the inner diameter surface of the inner ring 331. Through this arrangement, the inner ring 331 can improve the heat conduction efficiency of the heat-conducting element 1121 to the outside, thereby improving the heat dissipation efficiency of the heat-conducting element 1121 on the permanent magnet rotor 32, which in turn improves the heat dissipation efficiency of the motor 300. In the above arrangement, the connection or contact between the heat-conducting element 1121 and the inner diameter surface of the inner ring 331 also increases the heat dissipation area of ​​the heat-conducting element 1121, thereby improving its heat conduction efficiency and further enhancing the heat dissipation efficiency of the motor 300.

[0065] In one embodiment, the heat-conducting structure 33 further includes an outer ring body 332 and two end caps 333. The outer ring body 332 and the inner ring body 331 are coaxially arranged, with the outer ring body 332 surrounding the inner ring body 331. The two end caps 333 are respectively connected to the two sides of the inner ring body 331 and the outer ring body 332. Through this arrangement, the outer ring body 332 and the inner ring body 331 can increase the heat-conducting area of ​​the heat-conducting structure 33, thereby improving the heat conduction efficiency of the heat-conducting component 1121 and thus enhancing the heat dissipation efficiency of the motor 300. Simultaneously, the end caps 333 can reduce the influence of ambient heat on the internal temperature of the heat-conducting structure 33, preventing ambient heat from affecting the heat conduction path of the heat-conducting structure 33 to the heat-conducting component 1121, thereby improving the stability of heat dissipation of the heat-conducting structure 33.

[0066] In one embodiment, the inner ring 331, the outer ring 332, and the two end caps 333 enclose a cooling space 334. The outer ring 332 has a through hole 335 communicating with the cooling space 334. The through hole 335 allows flowing air or coolant to pass through, enabling the inner ring 331 to achieve air or liquid cooling of the heat-conducting component. Through this arrangement, the flowing air or coolant can cool the inner ring 331, maintaining it at a lower temperature, thereby improving the thermal conductivity of the inner ring 331. This, in turn, improves the heat dissipation efficiency of the inner ring 331 on the heat-conducting component 1121, and consequently, improves the heat dissipation efficiency of the motor 300.

[0067] It should be noted that the coolant used in this application can be water, oil, etc., and there are no restrictions on this.

[0068] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A flexible circuit board winding, characterized in that, include: Phase coil group, the phase coil group comprising: Multiple coil groups, each coil group including at least two coils, the multiple coil groups are arranged along a preset direction, and the two coil groups located at the two sides along the preset direction are defined as the first coil group and the last coil group; Multiple connectors, the multiple connectors having electrical and thermal conductivity, the connectors being electrically connected between two adjacent coil groups such that the two adjacent coil groups are connected in series; Multiple heat-conducting elements, each of which is integrally formed or connected to a connector, wherein the heat-conducting element is located on the side of the connector away from the coil assembly, and the heat-conducting element can be connected to or in contact with an external heat-conducting structure to conduct the heat of the coil assembly to the outside; Two electrodes are respectively electrically connected to the first-end coil group and the last-end coil group; The phase coil group can be wound such that multiple coil groups are arranged in a ring structure, at least two non-adjacent coil groups at least partially overlap in the radial direction of the ring structure, and any two heat-conducting elements at least partially do not overlap in the radial direction of the ring structure.

2. The flexible circuit board winding according to claim 1, characterized in that, The phase coil group is provided with at least three, so that the flexible circuit board winding is a multi-phase winding; There is a gap between two adjacent coil groups in each phase coil group, one of the phase coil groups is defined as a first phase coil group, and the other phase coil groups are defined as second phase coil groups, and any one of the coil groups of all second phase coil groups is at least partially located in the gap formed by the first phase coil groups; The plurality of phase coil groups are wound such that the plurality of phase coil groups form the annular structure, wherein any two heat-conducting elements do not overlap at least partially in the radial direction of the annular structure.

3. The flexible circuit board winding according to claim 2, characterized in that, When multiple phase coil groups are wound, no two electrodes shall come into contact.

4. The flexible circuit board winding according to claim 1, characterized in that, The heat-conducting component includes two sides radially distributed along the annular structure. The phase coil group includes an insulating cover portion, which wraps around the connector and one side of the heat-conducting component. The other side of the heat-conducting component can be exposed and connected or in contact with an external heat-conducting structure.

5. An electric motor, characterized in that, The motor is a slotless permanent magnet motor and includes: The stator core is axial in shape and has heat dissipation through holes extending along its axial direction. The flexible circuit board winding as described in any one of claims 1 to 4, wherein the flexible circuit board winding is arranged around the stator core and in close contact with the stator core, and the heat-conducting element of the flexible circuit board is at least partially bent and located within the heat dissipation through hole; A permanent magnet rotor is arranged around the flexible circuit board winding and is spaced apart from the flexible circuit board winding; A heat-conducting structure, comprising a heat-conducting shaft and a heat dissipation component connected to the heat-conducting shaft, wherein the heat-conducting shaft is at least partially located within the heat dissipation through hole and is connected to or in contact with the heat-conducting component.

6. The motor according to claim 5, characterized in that, The heat dissipation component includes an annular fixing part and heat dissipation fins fixed in the annular fixing part, and the heat dissipation fins are connected to the heat-conducting shaft.

7. The motor according to claim 6, characterized in that, The annular fixing part is provided with cooling holes that penetrate the inner and outer diameter surfaces of the annular fixing part. The cooling holes can allow flowing air or coolant to pass through, so that the heat dissipation fins can be air-cooled or liquid-cooled.

8. An electric motor, characterized in that, The motor is a slotless permanent magnet motor and includes: Stator core, wherein the stator core is in the form of a ring; The flexible circuit board winding as described in any one of claims 1 to 4, wherein the flexible circuit board winding is arranged around and in close contact with the stator core, and the heat-conducting element of the flexible circuit board is at least partially non-overlapping with the stator core along the radial direction of the stator core, such that the heat-conducting element extends to one side of the stator core along its axial direction. A permanent magnet rotor, which is a shaft, is surrounded by the flexible circuit board winding and is spaced apart from the flexible circuit board winding. A thermally conductive structure, the thermally conductive structure including an inner ring body, the thermally conductive element being connected to or in contact with the inner diameter surface of the inner ring body.

9. The motor according to claim 8, characterized in that, The heat-conducting structure also includes an outer ring body and two end caps. The outer ring body and the inner ring body are coaxially arranged, and the outer ring body surrounds the inner ring body. The two end caps are respectively connected to the two sides of the inner ring body and the outer ring body.

10. The motor according to claim 9, characterized in that, The inner ring, the outer ring, and the two end caps enclose a cooling space. The outer ring has a through hole that connects to the cooling space. The through hole allows flowing air or coolant to pass through, so that the inner ring can achieve air cooling or liquid cooling of the heat-conducting component.

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