Power plant, power-assisted unit, vehicle and movable device

Abstract

The application provides a power device, an assisting unit, a vehicle and a movable device, wherein the power device comprises coaxial first and second components and a weight-reducing part, the first component comprises a first body and a first support part, a first side of the first support part is connected with the first body; the second component comprises a second body and a second support part, a first side of the second support part is connected with the second body, an air gap is arranged between the second component and the first component, and a second side of the first support part and a second side of the second support part are both arranged towards the air gap; the weight-reducing part comprises a first weight-reducing part and / or a second weight-reducing part; the first weight-reducing part is arranged at a position where a first circumferential wall of the first body away from the air gap coincides with a central axis surface of the first support part, and the central axis surface of the first support part is parallel to a first shaft; and / or the second weight-reducing part is arranged at a position where a second circumferential wall of the second body away from the air gap coincides with a central axis surface of the second support part, and the central axis surface of the second support part is parallel to the first shaft.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to power devices, power assist units, vehicles and mobile devices. Background Technology

[0002] The rotor of a permanent magnet synchronous motor contains permanent magnets to generate a constant magnetic field. When the stator windings on the stator are energized, a magnetic field that changes with time is generated inside the stator. The rotating magnetic field interacts with the magnetic field of the permanent magnets to form an electromagnetic induction force, which causes the rotor to rotate relative to the stator.

[0003] In related technologies, weight-reduction holes are made on the stator or rotor to reduce the weight of the stator or rotor and improve the operating performance of the motor. However, these weight-reduction holes are usually made on the main magnetic circuit of the stator and / or rotor, or in the area of ​​the magnetic barrier. More magnetic lines of force pass through the weight-reduction holes, affecting the original magnetic circuit distribution of the motor itself, thus limiting the improvement of motor performance and hindering the improvement of motor operating efficiency. Utility Model Content

[0004] In view of this, the present invention proposes a power unit, an assist unit, a vehicle, and a mobile device that takes into account both weight reduction and performance improvement of the power unit.

[0005] The power device according to the first aspect of this utility model includes: a first component, which has an annular structure and is arranged around a first axis, the first component including a first body and one or more first support portions, the first side of the one or more first support portions being connected to the first body; a second component, which has an annular structure and is coaxially arranged with the first component, the second component including a second body and one or more second support portions, the first side of the one or more second support portions being connected to the second body, an air gap being included between the second component and the first component to allow the second component to move relative to the first component, the second side of the first support portion and the second side of the second support portion both being arranged towards the air gap; and a weight reduction portion, the weight reduction portion including a first weight reduction portion and / or a second weight reduction portion; wherein, the first weight reduction portion is located at a first preset position, the first preset position including a position where the first peripheral wall of the first body away from the air gap coincides with the central axis surface of the first support portion, the central axis surface of the first support portion being parallel to the first axis; and / or, the second weight reduction portion is located at a second preset position, the second preset position including a position where the second peripheral wall of the second body away from the air gap coincides with the central axis surface of the second support portion, the central axis surface of the second support portion being parallel to the first axis.

[0006] By adopting the solution of the first aspect of this application, a weight-reducing part is provided on the first and / or second components of the power device, which can effectively reduce the weight of the first and / or second components. The first weight-reducing part is located at the position where the first peripheral wall of the first body away from the air gap coincides with the central axis surface of the first support. This position is far from the main magnetic circuit area of ​​the power device and has no magnetic lines of force or only a very small number of magnetic lines of force passing through it. Therefore, the setting of the first weight-reducing part will not affect the initial magnetic field distribution of the power device, achieving weight reduction of the first component while ensuring that the entire power device achieves the preset performance. The second weight-reducing part is located at the position where the second peripheral wall of the second body away from the air gap coincides with the central axis surface of the second support. This position is far from the main magnetic circuit area of ​​the power device and has no magnetic lines of force or only a very small number of magnetic lines of force passing through it. Therefore, the setting of the second weight-reducing part will not affect the initial magnetic field distribution of the power device, achieving weight reduction of the second component while ensuring that the entire power device achieves the preset performance.

[0007] The assist unit proposed in the second aspect of this utility model includes an actuator and a power device as described in the foregoing embodiments. The power device has a power output shaft, which is connected to the actuator to drive the actuator to move.

[0008] By adopting the solution of the second aspect of this application, the assist unit of this application is lightweight and can achieve a preset rated power, the power device can achieve a preset power output, and drive the actuator to achieve the required movement.

[0009] The vehicle proposed in the third aspect of this utility model includes the power assist unit and the walking device of the foregoing embodiments, wherein the walking device is connected to the power assist unit to receive assistance from the power assist unit.

[0010] By adopting the solution of the third aspect of this application, the vehicle of this application has the beneficial effects of the assist unit in the foregoing embodiments, enabling the vehicle to have efficient power output and enabling the walking device to be assisted, making it easier for the user to use.

[0011] The movable device according to the fourth aspect of this utility model includes the power device of the foregoing embodiment; and a thrust device connected to the power device to receive the power of the power device.

[0012] By adopting the solution of the fourth aspect of this application, the mobile device of this application has a lightweight and high-performance power device, which can realize the stable and rapid movement of the mobile device.

[0013] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the disclosure of the embodiments of this utility model. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the power device proposed in some embodiments of this application;

[0016] Figure 2 This is a longitudinal sectional view of a power unit proposed in some embodiments of this application;

[0017] Figure 3 This is a cross-sectional view of a power unit proposed in some embodiments of this application;

[0018] Figure 4 yes Figure 3 A cross-sectional view of the power unit with the housing and drive shaft removed.

[0019] Figure 5 This is a cross-sectional view of a first component proposed in some embodiments of this application, wherein a coil is carried on a first support portion;

[0020] Figure 6 This is a three-dimensional structural schematic diagram of the first component proposed in some embodiments of this application, wherein a coil is carried on the first support portion;

[0021] Figure 7 This is a cross-sectional view of a second component proposed in some embodiments of this application, wherein a permanent magnet is carried in a second groove between two adjacent second supports;

[0022] Figure 8 This is a three-dimensional structural schematic diagram of the second component proposed in some embodiments of this application, wherein a permanent magnet is carried in the second groove between two adjacent second support portions;

[0023] Figure 9 This is a magnetic circuit diagram of the power unit before the weight reduction section is installed on the first and second components;

[0024] Figure 10 This is a magnetic circuit diagram of a power device with a first weight reduction part on a first component and a second weight reduction part on a second component, as proposed in some embodiments of this application.

[0025] Figure 11 This is a simplified schematic diagram of the assist unit proposed in some embodiments of this application;

[0026] Figure 12 This is a simplified schematic diagram of a vehicle proposed in some embodiments of this application;

[0027] Figure 13 This is a simplified schematic diagram of a movable device proposed in some embodiments of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 100. Power unit; 101. Power take-off shaft;

[0030] 10. First component;

[0031] 11. First body; 111. First perimeter wall;

[0032] 12. First support section; 121. First central axis surface;

[0033] 13. First tank;

[0034] 20. Second component;

[0035] 21. Second body; 211. Second perimeter wall;

[0036] 22. Second support section; 221. Second central axis surface;

[0037] 23. Second tank;

[0038] 31. Air gap;

[0039] 32. Chassis; 321. Third peripheral wall; 322. First heat dissipation channel;

[0040] 33. Power shaft; 331. First shaft; 332. Fourth peripheral wall; 333. Second heat dissipation channel;

[0041] 40. Weight Loss Section;

[0042] 41. First weight reduction section; 411. First weight reduction unit; 42. Second weight reduction section; 421. Second weight reduction unit;

[0043] 51. Coil; 52. Permanent magnet;

[0044] 1000, Support Unit; 200, Actuating Agency;

[0045] 3000, vehicle; 3100, walking device; 4000, movable device. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are all within the protection scope of the present utility model.

[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application. Furthermore, 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 indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] It should also be understood that the terminology used in this application specification is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" are intended to include the plural forms. In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be represented as: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be a single item or multiple items.

[0049] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] In related technologies, weight-reduction holes are made on the stator or rotor to reduce the weight of the stator or rotor and improve the operating performance of the motor. However, these weight-reduction holes are usually made on the main magnetic circuit of the stator and / or rotor, or in the area of ​​the magnetic barrier. More magnetic lines of force pass through the weight-reduction holes, affecting the original magnetic circuit distribution of the motor itself, thus limiting the improvement of motor performance and hindering the improvement of motor operating efficiency.

[0051] In view of this, this application proposes a power unit 100, which aims to solve at least one of the aforementioned technical problems.

[0052] Please see Figure 1 , Figure 2 and Figure 3 As shown, an embodiment of this utility model provides a power device 100, including a first component 10, a second component 20, and a weight-reducing part 40. In some embodiments, the first component 10 may be a fixed part, a component that does not move relative to a reference frame, such as a stator or stator housing; the second component 20 may be a movable part, a component that moves relative to a reference frame, such as a rotor that rotates relative to the stator. In this embodiment, the first component 10 and the second component 20 constitute an internal rotor motor. In some embodiments, the first component 10 may be a movable part, a component that moves relative to a reference frame, such as a rotor that rotates relative to the stator; the second component 20 may be a fixed part, a component that does not move relative to a reference frame, such as a stator or stator housing. In this embodiment, the first component 10 and the second component 20 constitute an external rotor motor. In some embodiments, the weight reduction part 40 includes various weight reduction structures or combinations thereof, such as weight reduction holes, weight reduction grooves, and weight reduction channels. For example, all weight reduction parts 40 may be weight reduction holes, weight reduction parts may be weight reduction grooves, weight reduction parts may be weight reduction channels, or weight reduction parts may be any combination of weight reduction holes, weight reduction grooves, or weight reduction channels, as long as weight reduction can be achieved without affecting motor performance.

[0053] Among them, combined Figure 4 , Figure 5 and Figure 6 As shown, the first component 10 has a ring-shaped structure, surrounding the first axis 331 (the first axis 331 is as follows). Figure 6 (As shown) Settings. Figure 3 and Figure 4As shown, the first component 10 includes a first body 11 and one or more first support portions 12, with a first side of the one or more first support portions 12 connected to the first body 11. In some embodiments, the first body 11 includes an annular structure near the outer side of the first component 10, having a certain thickness in the radial direction, capable of connecting the first side of the first support portion 12. It is understood that the first body 11 includes a yoke for providing a low magnetic reluctance path, allowing magnetic lines of force to form a closed loop. It is understood that the first body 11 has an outer peripheral wall (i.e., an outer surface) and an inner peripheral wall (i.e., an inner surface), with the first side of one or more first support portions 12 connected to the inner peripheral wall (not shown) of the first body 11. It should be noted that the peripheral wall mentioned in this application specifically refers to an annular or cylindrical wall surrounding the outer periphery (outer surface) or inner periphery (inner surface) of an object, emphasizing the geometric feature of "circumferential enclosure".

[0054] like Figure 1 and Figure 2 As shown, the second component 20 has a ring-shaped structure and is coaxially arranged with the first component 10. Figure 4 and Figure 7 As shown, the second component 20 includes a second body 21 and one or more second support portions 22, with a first side of the one or more second support portions 22 connected to the second body 21. In some embodiments, the second body 21 includes an annular structure near the inner side of the second component 20, having a radial thickness capable of connecting the first side of the second support portion 22. It is understood that the second body 21 includes a yoke for providing a low magnetic reluctance path, allowing magnetic lines of force to form a closed loop. It is understood that the second body 21 has an outer peripheral wall (i.e., an outer surface) and an inner peripheral wall (i.e., an inner surface), with the first side of one or more second support portions 22 connected to the outer peripheral wall (not shown) of the second body 21.

[0055] like Figure 4As shown, an air gap 31 is included between the second component 20 and the first component 10 to allow the second component 20 to move relative to the first component 10. This movement primarily includes rotation, but can also be axial relative sliding. This gap ensures that the first component 10 and the second component 20 are closely adjacent but do not rub against each other. Preferably, the first component 10 and the second component 20 include the air gap 31 in the radial direction. The second side of the first support portion 12 and the second side of the second support portion 22 both face the air gap 31. It should be noted that the first side and the second side of the first support portion 12 in this application are relative. If the first side of the first support portion 12 (e.g., the side away from the first axis 331) is connected to the first body 11, then the second side (e.g., the side closer to the first axis 331) faces the air gap 31. If the first side of the second support portion 22 (e.g., the side closer to the first axis 331) is connected to the second body 21, then the second side of the second support portion 22 (e.g., the side away from the first axis 331) faces the air gap 31.

[0056] like Figure 1 , Figure 3 and Figure 4 As shown, the weight-reducing section 40 includes a first weight-reducing section 41 and / or a second weight-reducing section 42. Here, the weight-reducing section 40 may only include the first weight-reducing section 41; or the weight-reducing section 40 may only include the second weight-reducing section 42; or the weight-reducing section 40 may include both the first weight-reducing section 41 and the second weight-reducing section 42.

[0057] Among them, such as Figure 4 As shown, the first weight-reducing part 41 is located at a first preset position. The first preset position is the position where the first peripheral wall 111 of the first body 11, away from the air gap 31, coincides with the central axis surface 121 of the first support part 12. It can be understood that since the weight-reducing part 40 actually achieves weight reduction by removing the existing body, the first preset position was part of the first body 11 before the first weight-reducing part 41 was installed (see...). Figure 9 The location of label 14 in the schematic diagram before setting the weight reduction unit 40 is the location of the first preset position. After setting the first weight reduction unit 41, the first preset position is manifested as a virtual position in space (see...). Figure 10 The location of reference numeral 14 in the schematic diagram showing the first weight-reducing part 41 is the location of the first preset position. Therefore, those skilled in the art can determine the location of the first preset position before the first weight-reducing part 41 was installed based on the location of the first weight-reducing part 41. (Refer to...) Figure 6As shown, the geometric center of the first weight-reducing part 41 is approximately located on the central axis surface 121 (i.e., the first central axis surface 121) of the first support part 12. The central axis surface 121 of the first support part 12 is parallel to the first axis 331. It can be understood that the first axis 331 is located on the central axis surface 121 of the first support part 12, which is a special parallel arrangement. It should be noted that the general understanding stated in this application is that, within the error range (e.g., processing error or measurement error, etc.), the geometric center of the first weight-reducing part 41 is approximately located on the central axis surface 121 of the first support part 12. In this embodiment, the weight reduction efficiency, the rotational dynamic balance of the power unit 100, and the performance of the power unit 100 are all taken into account, and the optimal performance of the power unit 100 can be obtained while achieving optimal weight reduction. Alternatively, at least a portion of the first weight-reducing part 41 may be located at a first preset position (that is, the geometric center of the first weight-reducing part 41 may not be approximately located on the central axis plane 121 of the first support part 12, but at least a portion of the weight-reducing part 41 is located at the first preset position, as long as there are no magnetic lines of force or only a few magnetic lines of force at that position). In other words, when the weight-reducing part 40 includes the first weight-reducing part 41, the first weight-reducing part 41 is selectively disposed in a specific area of ​​the first component 10, and its location is related to the placement position of the first support part 12. When the first support part 12 includes multiple components, the first weight-reducing part 41 can also be multiple components. It can be understood that the first peripheral wall 111 of the first body 11 refers to the outer peripheral wall of the first body 11, that is, the annular or cylindrical wall surface of the outer periphery of the first body 11. It should be noted that the central axis plane, also called the symmetry plane or mirror symmetry plane, mentioned in this application refers to a plane that can divide an object into two mutually mirror-symmetrical parts. For example, a simple left-right symmetrical object: one central axis plane (median sagittal plane). Examples: human body, butterfly, symmetrical letter "A". Multiple central planes (if the object has additional symmetry): Perfect cylinder: infinitely many central planes (any plane containing the central axis is a symmetry plane). Cube: 9 central planes (3 groups, 3 parallel planes in each group). Regular tetrahedron: 6 central planes (each edge corresponds to a symmetry plane). Objects that are only symmetrical from left to right: only 1 central plane (when there are no other symmetry planes). In this embodiment, the support part is at least symmetrical from left to right, so the first central plane of the first support part 12 is parallel to the first axis 331. In some embodiments, the first weight-reducing part 41 is one or any combination of three of the following: weight-reducing hole, weight-reducing groove, or weight-reducing channel, as long as it does not affect the rotational balance or dynamic balance characteristics of the power device 100. In some embodiments, such as Figure 6 The first weight-reducing part 41 includes a weight-reducing hole penetrating the upper and lower surfaces of the first body 11. The weight-reducing hole is shaped like a hollow cylinder, such as... Figure 5The cross-sectional shape of the weight-reducing hole is semi-circular. It can be understood that the cross-sectional shape of the weight-reducing hole can also be elliptical, trapezoidal, square, triangular, or irregular, such as a major or minor arc, or a fan shape. In some embodiments, the first weight-reducing part 41 is a weight-reducing groove. The first weight-reducing groove is disposed on the outer wall of the first body 11, but does not penetrate the upper and lower surfaces of the first body 11. Therefore, weight reduction can be achieved without affecting the rigidity of the first body 11.

[0058] like Figure 4 As shown, the second weight-reducing part 42 is located at a second preset position. The second preset position includes the position where the second peripheral wall 211 of the second body 21, away from the air gap 31, coincides with the central axis surface 221 of the second support part 22. It can be understood that since the weight-reducing part is actually achieved by removing the existing body, the second preset position was part of the second body 21 before the second weight-reducing part 42 was installed (see...). Figure 9 The location of label 24 in the schematic diagram before the weight reduction unit 40 is shown is the location of the second preset position. After the second weight reduction unit 42 is set, the second preset position is a virtual position in space (see...). Figure 10 The location of reference numeral 24 in the schematic diagram showing the installation of the weight-reducing part 40 is the location of the second preset position. Therefore, those skilled in the art can determine the location of the second preset position before the installation of the second weight-reducing part 42 based on the position of the second weight-reducing part 42. (Refer to...) Figure 8As shown, the geometric center of the second weight-reducing part 42 is approximately located on the central axis surface 221 (i.e., the second central axis surface 221) of the second support part 22. The second central axis surface 221 of the second support part 22 is parallel to the first axis 331. It can be understood that the first axis 331 is located on the central axis surface 221 of the second support part 22, which is a special parallel arrangement. In this embodiment, the weight reduction efficiency, the rotational dynamic balance of the power device 100, and the performance of the power device 100 are all taken into account, and the optimal performance of the power device 100 can be obtained while achieving optimal weight reduction. Alternatively, at least a portion of the second weight-reducing part 42 is located at a second preset position (that is, the geometric center of the second weight-reducing part 42 may not be approximately located on the central axis surface 221 of the second support part 22, but at least a portion of the weight-reducing part of the second weight-reducing part 42 is located at the second preset position, as long as there are no magnetic lines of force or only a few magnetic lines of force at that position). In other words, when the weight-reducing part 40 includes a second weight-reducing part 42, the second weight-reducing part 42 is selectively disposed in a specific area of ​​the second component 20, and its location is related to the placement position of the second support part 22. When there are multiple second support parts 22, there can also be multiple second weight-reducing parts 42. It can be understood that the second peripheral wall 221 of the second body 21 refers to the inner peripheral wall of the second body 21, that is, the annular or cylindrical wall surface of the inner periphery of the second body 21. The design concept of the second weight-reducing part is similar to that of the first weight-reducing part, and will not be described again here.

[0059] As can be seen from the above, by adopting the above-described power device 100 of this application, a first weight-reducing part 41 is provided at the position where the first peripheral wall 111 of the first body 11, away from the air gap 31, coincides with the first central axis surface 121 of the first support part 12, and / or a second weight-reducing part 42 is provided at the position where the second peripheral wall 211 of the second body 21, away from the air gap 31, coincides with the second central axis surface 221 of the second support part 22, which can effectively reduce the weight of the first component 10 and / or the second component 20, thereby making the entire power device 100 lighter. In some cases, it can reduce the rotational inertia of the moving components in the power device 100 and make the power device 100 obtain a faster response speed.

[0060] More specifically, see Figure 9 and Figure 10 The magnetic circuit distribution diagram shown ( Figure 9(This is a schematic diagram of the dynamic magnetic field distribution when the rotor rotates relative to the stator). The position on the first peripheral wall 111 of the first body 11 away from the air gap 31 and the first central axis surface 121 of the first support part 12 coincides with the area on the first component 10 where no magnetic field lines pass through or where there are very few magnetic field lines during the design stage. At the same time, this position is also far away from the main magnetic circuit of the power device 100. Therefore, the first weight reduction part 41 of this embodiment is set at this position where no magnetic field lines or only a few magnetic field lines pass through, which will not affect the distribution of the initial magnetic field of the power device 100 (the simulated magnetic field distribution of the power device during the design stage), thereby achieving weight reduction of the first component 10 while ensuring that the entire power device 100 achieves the preset performance. It is understood that at the initial static moment of the design, the distribution of magnetic field lines is approximately symmetrical. Furthermore, as the magnetic field lines are distributed across the second component 20 (e.g., the rotor) rotates relative to the first component 10 (e.g., the stator) at different angles, the distribution of magnetic field lines may undergo rotational and translational changes. Therefore, the multiple first weight-reducing sections 41 need to be rotationally symmetrical to prevent magnetic field lines from passing through them at different times; or the second weight-reducing section 42 needs to be rotationally symmetrical to prevent magnetic field lines from passing through it at different times. Preferably, in some embodiments, no magnetic field lines pass through this location.

[0061] Similarly, the position where the second peripheral wall 211 of the second body 21, away from the air gap 31, coincides with the second central axis surface 221 of the second support 22 is a region where no magnetic field lines pass through the second component 20 during the design phase, or a region with very few magnetic field lines. Simultaneously, this position is far from the main magnetic circuit of the power device 100. Therefore, placing the second weight-reducing part 42 of this embodiment at this position where no magnetic field lines or only a few magnetic field lines pass through will not affect the distribution of the initial magnetic field of the power device 100 (the simulated magnetic field distribution of the power device during the design phase), achieving weight reduction of the second component 20 while ensuring that the entire power device 100 achieves the preset performance. Preferably, in some embodiments, no magnetic field lines pass through this position.

[0062] Therefore, the power unit 100 of this application can enhance core competitiveness. The power unit 100 of this application can be an electric motor, a permanent magnet synchronous motor, or a bar-type permanent magnet motor, etc.

[0063] Therefore, it is understandable that, compared to related technologies where the weight reduction holes are placed on the stator teeth or stator yoke where magnetic lines of force pass through more frequently, thus affecting the distribution of the main magnetic circuit of the stator and causing a change in the magnetic field generated by the stator; and compared to related technologies where the weight reduction holes are placed on the edge of the rotor where magnetic lines of force pass through more frequently, thus affecting the distribution of the main magnetic circuit of the rotor and causing a change in the magnetic field generated by the rotor. The power device 100 of the foregoing embodiments of this application has a first weight reduction part 41 located at a specific position of the first component 10, where no magnetic field lines pass through or only a very small number of magnetic field lines pass through, thereby achieving weight reduction of the first component 10 without affecting the magnetic force distribution of the first component 10; and / or, a second weight reduction part 42 is located at a specific position of the second component 20, where no magnetic field lines pass through or only a very small number of magnetic field lines pass through, thereby achieving weight reduction of the second component 20 without affecting the magnetic force distribution of the second component 20. Ultimately, the entire power device 100 is weight-reduced without affecting the magnetic field of the internal main magnetic circuit, thereby achieving the preset performance of the power device 100. For example, the rated power output of the power device 100 can reach a preset value while being lightweight; or the response speed of the power device 100 can be faster while being lightweight.

[0064] The specific structures of the first component 10 and the second component 20 of this application will now be described in detail.

[0065] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the first component 10 is a fixed part, the second component 20 is a movable part, the first peripheral wall 111 is the outer peripheral wall, and the second peripheral wall 211 is the inner peripheral wall. In these embodiments, the first component 10 is fitted radially outward of the second component 20, and the second component 20 can move relative to the first component 10 along... Figure 2 The first shaft 331 shown rotates. Specifically, in these embodiments, the fixed part is a stator and the movable part is a rotor, thus forming a power device 100 with an outer fixed and inner rotating structure. In some specific embodiments, there is an air gap 31 between the fixed part and the movable part. The first peripheral wall 111 of the fixed part away from the air gap 31 is recessed inward toward the movable part to form a first weight-reducing part 41; the second peripheral wall 211 of the movable part away from the air gap 31 is recessed inward toward the fixed part to form a second weight-reducing part 42. It can be understood that the recess in this embodiment cannot exceed the maximum radial length of the first body 11 or the second body 21.

[0066] In other embodiments, the first component 10 is a movable part, the second component 20 is a fixed part, the first peripheral wall 111 is an inner peripheral wall, and the second peripheral wall 211 is an outer peripheral wall. In these embodiments, the first component 10 is fitted radially outside the second component 20, and the first component 10 can rotate relative to the second component 20 along the first axis 331. Specifically, in these embodiments, the fixed part is a stator, and the movable part is a rotor, thus forming a power device 100 with external rotation and internal fixation.

[0067] In some embodiments of this application, the fixing part is made of an iron core, such as silicon steel, which can efficiently conduct magnetic flux, effectively reduce excitation current, improve motor efficiency, reduce no-load current, and also reduce iron loss and heat generation. In other embodiments, other amorphous alloys or composite materials can also be used to make the fixing part, and there are no restrictions here.

[0068] Furthermore, such as Figure 5 and Figure 6 As shown, the first body 11 includes a fixed iron core body, and the first support part 12 includes fixed iron core teeth for supporting the coil 51. When the coil 51 is wound on the fixed iron core teeth, after being energized, the first component 10 can form a changing magnetic field. Alternatively, in other embodiments, a first groove 13 is formed between multiple first support parts 12 for supporting a permanent magnet 52 (not shown), which can form a relatively constant magnetic field.

[0069] Furthermore, the material of the moving part includes an iron core, such as silicon steel, which can efficiently conduct magnetic flux, construct a closed magnetic circuit, and has controllable cost, while also reducing thermal stress deformation. In other embodiments, other amorphous alloys or composite materials can also be used to make the moving part; no limitation is made here.

[0070] Furthermore, such as Figure 7 and Figure 8 As shown, the second body 21 includes a movable iron core body, and the second support 22 includes movable iron core teeth. A second groove 23 is formed between multiple second support 22s to support a permanent magnet 52, which can generate a relatively constant magnetic field. When the coil 51 on the first component 10 is energized, it can generate an electromagnetic force with the constant magnetic field of the permanent magnet 52 on the second component 20, thereby enabling the second component 20 to rotate relative to the first component 10. Alternatively, in other embodiments, the second support 22 is used to support the coil 51. In this case, a first groove 13 is formed between multiple first support 12s, and a permanent magnet 52 is disposed in the first groove 13, or each of the multiple first support 12s carries a coil 51. That is, at least one of the first support 12 and the second support 22 is used to support the coil 51, thereby generating an alternating magnetic field after energization.

[0071] In this application, the example described is that the coil 51 is carried by the fixed iron core teeth of the first component 10, and the permanent magnet 52 is carried on the second slot 23 of the second component 20. Those skilled in the art should understand that the electromagnetic induction arrangement of the power device 100 of this application can also be that the coil 51 is carried by the fixed iron core teeth of the first component 10, and the coil 51 is simultaneously carried on the movable iron core teeth of the second component 20; or, it can be that the permanent magnet 52 is carried in the first slot 13 of the first component 10, and the coil 51 is carried on the movable iron core teeth of the second component 20. No limitation is made here.

[0072] like Figure 9 As shown, when the first component 10 and the second component 20 of this application are used, but the weight-reducing part 40 is not provided on the first component 10 and the second component 20, the main magnetic circuit distribution of the power unit is clearly visible. See also Figure 9 The first preset position 14 shown is on the first component 10, combined with Figure 6 and Figure 9 As shown, the preferred geometric center of the first peripheral wall 111, located away from the air gap 31 and coinciding with the first central axial surface 121 of the first body 11, is approximately located on the first central axial surface 121 of the first support portion 12 (the first central axial surface 121 is parallel to the first axis 331) and a portion of the surrounding area. No magnetic field lines pass through this area, or the number of passing magnetic field lines is very small and limited. That is, no magnetic field lines pass through the first preset position 14, or the number of passing magnetic field lines is very small and limited. See also... Figure 9 The second preset position 24 shown is on the second component 20, combined with Figure 8 and Figure 9 As shown, the preferred geometric center of the second peripheral wall 211 of the second body 21, which is located away from the air gap 31 and coincides with the second central axis surface 221, is located on the second central axis surface 221 of the second support part 22 (the second central axis surface 221 is parallel to the first axis 331) and in the surrounding area. No magnetic lines of force pass through this area, or the magnetic lines of force passing through this area are very few and very limited. That is, no magnetic lines of force pass through this area at the second preset position 24, or the magnetic lines of force passing through this area are very few and very limited.

[0073] like Figure 10 As shown, when the first component 10 and the second component 20 of this application are used, and a first weight-reducing part 41 is provided on the first body 11 of the first component 10, the geometric center of the first weight-reducing part 41 is approximately located on the first peripheral wall 111 of the first body 11 away from the air gap 31, and the geometric center of the first weight-reducing part 41 is approximately located on the first central axis surface 121 of the first support part 12 (the first central axis surface 121 is as shown in the figure). Figure 6As shown), the first central axis surface 121 is parallel to the first axis 331. Therefore, it can be seen that the area where the first weight-reducing part 41 is provided is a region where no magnetic field lines pass or very few magnetic field lines pass through. Furthermore, a second weight-reducing part 42 is provided on the second body 21 of the second component 20, and the geometric center of the second weight-reducing part 42 is approximately located on the second central axis surface 221 of the second support part 22 (as shown in the diagram). Figure 8 As shown, the second central axis surface 221 is parallel to the first axis 331. Therefore, it can be seen that the area where the second weight-reducing part 42 is located is an area where no magnetic lines of force pass through or very few magnetic lines of force pass through. It is understandable that the multiple first weight-reducing parts of this application are not interconnected, in order to ensure the rigidity of the first component 10 or to avoid magnetic lines of force passing through the opening area, which would affect the performance of the power device. The multiple second weight-reducing parts of this application are not interconnected, that is, to avoid cutting off the entire inner peripheral wall of the second body 21 to connect the multiple weight-reducing parts for further weight reduction. This is because the second body 21 other than the second weight-reducing parts still needs to cooperate with the power shaft 33. If the entire inner wall of the second body 21 is cut off, although the second component 20 can be reduced in weight, a thicker power shaft 33 will be needed to cooperate with the second body 21 of the second component 20, and the overall weight of the power device 100 will actually increase.

[0074] In some embodiments of this application, the side of the first body 11 away from the air gap 31 is integrally formed, which improves the integrity of the first body 11.

[0075] In other embodiments of this application, such as Figure 5 As shown, the first sides of one or more first support portions 12 are interconnected to form a first body 11. For example, the first sides of multiple first support portions 12 are interlocked or plugged into each other, improving the assembly flexibility of the first component 10. In a further embodiment of this application, the first weight-reducing portion 41 is located in the non-connected area of ​​the first peripheral wall 111 of the first body 11, away from the air gap 31, so that the first weight-reducing portion 41 is also located in an area with very few or no magnetic lines of force, and the first weight-reducing portion 41 is located in the non-connected area, which can ensure the rigidity of the first body 11. In a specific embodiment, the size of the coil 51 sleeved on each first support portion 12 extending circumferentially along the first axis 331 can be designed to be smaller than the size of the portion of the first support portion 12 used to interlock to form the first body 11 extending circumferentially along the first axis 331.

[0076] And / or, in some embodiments of this application, such as Figure 8 As shown, the side of the second body 21 away from the air gap 31 is integrally formed, which improves the integrity of the second body 21.

[0077] In other embodiments of this application, the first sides of one or more second support portions 22 are interconnected to form a second body 21. For example, the first sides of multiple second support portions 22 are interlocked or plugged into each other, improving the assembly flexibility of the second component 20. In a further embodiment of this application, the second weight-reducing portion 42 is located in the non-connected region of the second peripheral wall 211 of the second body 21, away from the air gap 31, so that the second weight-reducing portion 42 is also located in a region with very few or no magnetic lines of force.

[0078] The remaining structures of this application, excluding the first weight-reducing part 41 and the second weight-reducing part 42, will now be described.

[0079] In some embodiments of this application, combined with Figure 1 , Figure 2 and Figure 3 As shown, the first component 10 is located radially outside the second component 20, and in addition to the first peripheral wall 111, the first component 10 also includes a housing 32. Figure 3 As shown, a first heat dissipation channel 322 is formed between the first weight-reducing part 41 and the third peripheral wall 321 of the housing 32. That is, the first weight-reducing part 41 of this application can be reused as a heat dissipation part, thereby forming a larger heat dissipation space, which is beneficial for the heat dissipation of the first component 10, preventing the first component 10 from overheating, and thus facilitating the long-term normal operation of the power unit 100. The first heat dissipation channel 322 can be directly used as a liquid cooling channel or an air cooling channel, or a liquid cooling pipe can be built into the first heat dissipation channel 322 to achieve liquid cooling. When the first heat dissipation channel 322 is used for air cooling or natural cooling, it can increase the heat dissipation area of ​​the first component 10.

[0080] And / or, in some embodiments of this application, combined with Figure 1 , Figure 2 and Figure 3 As shown, within the second peripheral wall 211 of the second component 20, a power shaft 33 is also included. The central axis of the power shaft 33 is the aforementioned first shaft 331. A second heat dissipation channel 333 is formed between the second weight-reducing part 42 and the peripheral wall 332 of the power shaft 33. That is to say, the second weight-reducing part 42 of this application can also be reused as a heat dissipation part, which is beneficial to the heat dissipation of the second component 20, avoids the second component 20 from overheating, and thus helps the power unit 100 to work normally for a long time. The second heat dissipation channel 333 can be directly used as a liquid cooling channel or an air cooling channel, or a liquid cooling pipe can be built into the second heat dissipation channel 333 to achieve liquid cooling. When the second heat dissipation channel 333 is used for air cooling or natural cooling, the heat dissipation area of ​​the second component 20 can be increased.

[0081] In some embodiments of this application, such as Figure 6As shown, the first weight-reducing part 41 includes multiple first weight-reducing units 411, and multiple first support parts 12 are respectively arranged one-to-one with the multiple first weight-reducing units 411. The geometric center of each first weight-reducing unit 411 is approximately located on the first central axis surface 121 of the corresponding first support part 12, and the multiple first weight-reducing parts are identical in shape and rotationally symmetrical (to ensure the dynamic balance characteristics of the power device during operation). By setting multiple first support parts 12, coils 51 can be wound on each of the multiple first support parts 12, and multiple sets of coils 51 can be formed as needed, enabling multi-phase alternating current to be passed through the coils 51, thereby generating an alternating electromagnetic field. Since the first weight-reducing units 411 arranged on the first peripheral wall 111 each correspond one-to-one with a first support part 12, as many first weight-reducing units 411 as possible can be opened on the first body 11, which is beneficial to maximizing the weight reduction of the first component 10. At the same time, it does not affect the distribution of the main magnetic circuit on the first component 10, ensuring that the first component 10 has the preset electromagnetic properties. Of course, in other embodiments, the multiple first weight reduction units 411 may be provided only in correspondence with a portion of the first support portion 12, while the remaining area of ​​the first body 11 located on the first central axis surface 121 of the first support portion 12 may not be provided with the first weight reduction units 411. This is not a limitation.

[0082] In some embodiments of this application, such as Figure 8 As shown, the second weight-reducing section 42 includes multiple second weight-reducing units 421, and multiple second support sections 22 are respectively arranged one-to-one with the multiple second weight-reducing units 421. The geometric center of each second weight-reducing unit 421 is approximately located on the second central axis surface 221 of the corresponding second support section 22, and the multiple second weight-reducing sections have the same shape and are arranged rotationally symmetrically (to ensure the dynamic balance characteristics of the power device). Therefore, by providing multiple second support sections 22, coils 51 can be wound on each of the multiple second support sections 22, or permanent magnets 52 can be provided in the second groove 23 between two adjacent second support sections 22, thereby forming a magnetic field that cooperates with the coils 51 on the first component 10, enabling movement between the second component 20 and the first component 10. Each of the second weight-reducing units 421 provided on the second peripheral wall 211 corresponds one-to-one with a second support portion 22. This allows for the creation of as many second weight-reducing units 421 as possible on the second body 21, maximizing the weight reduction of the second component 20. Simultaneously, it does not affect the main magnetic circuit distribution on the second component 20, ensuring that the second component 20 possesses the predetermined electromagnetic properties. Of course, in other embodiments, the multiple second weight-reducing units 421 may only correspond one-to-one with a portion of the second support portions 22, while the remaining area of ​​the second body 21 located on the second central axis surface 221 of the second support portion 22 is not provided with second weight-reducing units 421. This is not a limitation.

[0083] In some embodiments of this application, the cross-sectional shape of the weight-reducing portion 40 can be semi-circular, for example... Figure 5 The first weight-reducing section 41 shown has a semi-circular cross-sectional shape. The cross-sectional shape of the weight-reducing section 40 can also be square, for example... Figure 7 The second weight-reducing section 42 shown has a square cross-sectional shape. The cross-sectional shape of the weight-reducing section 40 can also be circular, elliptical, trapezoidal, or irregular, and there are no restrictions here.

[0084] Furthermore, the cross-sectional shape of the weight-reducing part 40 in this application includes at least one of the following: circular, semi-circular, elliptical, trapezoidal, square, or irregular, thereby making the shape of the weight-reducing part 40 more flexible and allowing its placement to better adapt to the nature of its placement area, effectively utilizing the size of the area without affecting the distribution of the main magnetic circuit. In some embodiments, the maximum length of the first weight-reducing part 41 along the radial direction of the first component 10 (perpendicular to the first axis 331 and perpendicular to the circumferential direction of the first component 10) is less than the first preset radial length, and the maximum length of the first weight-reducing part 41 along the circumferential direction of the first component 10 (perpendicular to the first axis 331 and perpendicular to the axial direction of the first component 10) is less than the first preset circumferential length, so as to avoid magnetic lines of force passing through or having a large number of magnetic lines of force passing through the location of the first weight-reducing part 41, thereby achieving maximum weight reduction without affecting the performance of the power device 100. The first preset radial length and the first preset circumferential length can be set according to the radial dimension and rated power of the power device 100 and the distribution of magnetic lines of force generated by the power device 100. In some embodiments, when the rated power remains constant, the larger the radial dimension of the power unit 100, the larger the first preset radial length and the larger the first preset circumferential length; conversely, when the radial dimension of the power unit 100 remains constant, the larger the rated power, the smaller the first preset radial length and the smaller the first preset circumferential length. In some embodiments, the maximum length of the second weight-reducing part 42 along the radial direction of the second component 20 is less than the second preset radial length, and the maximum length of the second weight-reducing part 42 along the circumferential direction of the second component 20 is less than the second preset circumferential length. This is to avoid magnetic field lines passing through or having a large number of magnetic field lines passing through the location of the second weight-reducing part 42, thereby achieving maximum weight reduction without affecting the performance of the power unit 100. The second preset radial length and the second preset circumferential length can be set according to the radial dimension and rated power of the power unit 100 and the distribution of magnetic field lines generated by the power unit 100. In some embodiments, when the rated power remains constant, the larger the radial dimension of the power unit 100, the larger the second preset radial length and the larger the second preset circumferential length; when the radial dimension of the power unit 100 remains constant, the larger the rated power, the smaller the second preset radial length and the smaller the second preset circumferential length.

[0085] In some embodiments of this application, the magnetic flux density at the locations of the first weight-reducing part 41 and the second weight-reducing part 42 is less than a preset threshold. This preset threshold can be determined at least based on the rated power of the power device 100, thereby achieving lightweight while ensuring that the power device 100 has rated power. In the embodiments of this application, magnetic flux density refers to the distribution intensity of the magnetic field in space, characterizing the number of magnetic field lines passing through a unit area, and reflecting the strength and direction (vector) of the magnetic field at a certain point in space.

[0086] The relationship between magnetic flux density and preset threshold will be derived below.

[0087] Taking a strip permanent magnet motor (such as a surface-mounted permanent magnet synchronous motor) as an example, based on the formulas (1) P = T × w, where w = 2πn / 60; (2) T ∝ B·D·l·I, (3) I ∝ A·D, (4) p ∝ (1 / τ = 2p / πD), and ignoring secondary factors such as winding coefficient and efficiency, we can obtain the following relationship between magnetic flux density B and motor size, number of pole pairs p, and power P:

[0088] B g ≈k·P / (D 2 ·l·np)(5)

[0089] Where B represents magnetic flux density (T, Tesla), P represents rated power (W), D represents the inner diameter of the stator or rotor of the power unit (m), l represents the axial length of the iron core (m), n represents the rotational speed (rpm), p represents the number of pole pairs, k represents the comprehensive constant (related to winding coefficient, pole arc coefficient, efficiency, etc., usually k≈0.05~0.2 and needs to be selected according to design experience), T represents electromagnetic torque, A represents electrical load (line current density, A / m), I represents current, and τ represents pole pitch.

[0090] That is, according to the above formula, we can obtain:

[0091] B∝P(6)

[0092] B∝1 / D 2 ·l(7)

[0093] That is, the magnetic flux density B is positively correlated with the rated power P, and the magnetic flux density B is negatively correlated with the motor size (radial dimension of the power unit).

[0094] Based on the above formula, we can also obtain:

[0095] B∝1 / p(8)

[0096] In some implementations, the magnetic flux density B is negatively correlated with the number of pole pairs (if B remains unchanged when the number of poles increases, it may lead to local magnetic circuit oversaturation, so B needs to be actively reduced).

[0097] According to the aforementioned formula, when designing the power unit 100, one can know how to design the first weight reduction part 41 or the second weight reduction part 42 without affecting the performance of the power unit 100, taking into account its rated power, size requirements, or pole pair requirements. That is, according to the above formula, one can know the magnetic field distribution and magnetic density of each region of the first component 10 and the second component 20 of the power unit 100. Therefore, by setting the first weight reduction part 41 or the second weight reduction part 42 in the region where the magnetic density is 0 or the magnetic density is extremely small, the weight of the power unit can be reduced without affecting the performance of the power unit 100.

[0098] Specifically, the magnetic flux density at the locations of the first weight-reducing part 41 and the second weight-reducing part 42 is less than a preset threshold. The preset threshold can be derived based on the above-mentioned magnetic flux density, the rated power of the power device 100, the size of the power device, etc.

[0099] Since magnetic flux density is positively correlated with the rated power of the power unit 100, and to avoid affecting the performance of the power unit, placing the weight-reducing part 40 at a location with lower magnetic flux density minimizes its impact on power performance. Therefore, in a further embodiment of this application, with the radial dimension of the power unit 100 remaining unchanged (stator core or rotor core), the higher the rated power, the higher the magnetic flux density. Thus, the preset threshold needs to be designed to be as small as possible, so that the location of the weight-reducing part 40 passes through a lower magnetic flux density and fewer magnetic lines of force, thereby minimizing the impact on the performance of the power unit 100. In other words, the preset threshold is negatively correlated with the rated power of the power unit 100. In other words, the higher the rated power, the smaller the preset threshold. Through the above settings, it can be ensured that only a limited number of magnetic lines of force pass through the locations where the first weight-reducing part 41 and the second weight-reducing part 42 are placed, or that no magnetic lines of force pass through, without affecting the main magnetic circuit distribution of the first component 10 and the second component 20; and that the power unit 100 achieves its preset rated power. When the power unit 100 is set to a large rated power, the preset threshold will be limited to a small range. Then, only a few magnetic lines of force pass through the first weight reduction part 41 and the second weight reduction part 42, or even no magnetic lines of force pass through, which does not interfere with the magnetic circuit distribution of the entire power unit 100. Thus, this application can not only achieve a large rated power but also achieve effective weight reduction.

[0100] In some embodiments of this application, the preset threshold can also be determined based on the radial dimension of the power unit 100, thereby ensuring that the power unit 100 has the required radial dimension while achieving lightweight.

[0101] In a further embodiment of this application, based on a similar concept of analyzing the relationship between a preset threshold and rated power, the magnetic flux density B is negatively correlated with the motor size (radial dimension of the power unit 100). When the radial dimension of the power unit 100 increases, the magnetic flux density at the same location in the first weight reduction section 41 may decrease. Therefore, the preset threshold is positively correlated with the radial dimension of the power unit 100. The preset threshold can be set slightly higher to significantly reduce the weight of the power unit without affecting performance. Of course, the magnetic flux density and preset threshold of this application can also be designed based on other performance parameters of the power unit 100, as long as the preset performance of the power unit 100 is met while achieving weight reduction and without affecting the electromagnetic performance of the power unit 100. When the radial dimension of the power device 100 of this application is large, the preset threshold can be limited to a slightly larger range. Then, only a few magnetic lines of force pass through the first weight reduction part 41 and the second weight reduction part 42, or even no magnetic lines of force pass through, so as not to interfere with the magnetic circuit distribution of the entire power device 100. Thus, the power device 100 of this application can not only achieve a large radial dimension, but also achieve effective weight reduction.

[0102] In some embodiments of this application, the preset threshold is 0.1T to 1T, for example, it can be 0.1T, 0.2T, 0.3T, 0.4T, 0.5T, 0.6T, 0.8T, 0.9T, 1T, etc., and there is no limitation here.

[0103] In some embodiments of this application, such as Figure 10 As shown, the first weight-reducing part 41 is located in the region where the magnetic flux density of the first component 10 is 0, so that the placement of the first weight-reducing part 41 does not affect the magnetic circuit distribution of the first component 10 and can saturate the magnetic circuit. This achieves that the power unit 100 has excellent electromagnetic performance while being sufficiently lightweight.

[0104] In some embodiments of this application, such as Figure 10 As shown, the second weight-reducing part 42 is located in the region where the magnetic flux density of the second component 20 is 0, so that the placement of the second weight-reducing part 42 does not affect the magnetic circuit distribution of the second component 20 and can saturate the magnetic circuit. This achieves the power unit 100 having excellent electromagnetic performance while being sufficiently lightweight.

[0105] In some embodiments of this application, the preset threshold can also be determined based on the number of pole pairs of the power unit 100, thereby ensuring that the power unit 100 has the required number of pole pairs while achieving lightweight design. This design concept is similar to that for rated power and radial dimensions of the power unit, and will not be elaborated further here.

[0106] In a specific embodiment, such as Figure 10As shown, the power device 100 of this application is a three-phase motor. The first component 10 of this application is a stator, and the stator has multiple stator teeth as first support parts 12. A first slot 13 is formed between adjacent stator teeth. Multiple coils 51 are divided into three groups and wound on different stator teeth. Each group of coils 51 can be connected to an external power source and can be input with alternating current with a three-phase phase difference of 120 degrees, thereby generating a rotating magnetic field after the three groups of coils 51 are energized. The second component 20 of this application is a rotor, and the rotor has multiple protrusions as second support parts 22. A second slot 23 is formed between adjacent protrusions. Each second slot 23 carries a permanent magnet 52. The permanent magnet 52 can form a constant magnetic field. When the coils 51 on the stator are energized, the resulting alternating magnetic field drives the rotor to rotate.

[0107] In a specific embodiment of this application, the first support portion 12 may be composed of multiple support pieces stacked radially along the power device 100, and the adjacent support pieces located on the outermost side of the radial direction can be engaged to form the first body 11. Similarly, the second support portion 22 may also be composed of multiple support pieces stacked radially along the power device 100, and the adjacent support pieces located on the innermost side of the radial direction can be engaged to form the second body 21.

[0108] In some implementations, see Figures 3-5The weight-reducing holes are all located at positions where the magnetic flux density is less than a preset threshold. The size of the preset threshold is related to the motor size and performance. Generally, the larger the motor size, the larger the preset threshold; the greater the motor power, the smaller the preset threshold. The preset threshold is generally in the range of 0.1T-1T. The hole positions include, but are not limited to (described from a cross-sectional perspective): In the case of an internal rotor motor, the weight-reducing holes are located at the outer edge of the stator core (e.g., the cross-section of the first peripheral wall 111 of the first body 11, where the first peripheral wall 111 is the outer peripheral wall), the inner edge of the rotor core (e.g., the cross-section of the second peripheral wall 211 of the second body 21, where the second peripheral wall 211 is the inner peripheral wall), the outer edge of the stator and a position coinciding with the center line of the stator teeth (e.g., the cross-section of the first peripheral wall 111 of the first body 11 coincides with the central axis surface 121 of the first support 12, where the first peripheral wall 111 is the outer peripheral wall), and the center line between the rotor magnetic poles (e.g., the cross-section of the second peripheral wall 211 of the second body 21 coincides with the central axis surface 221 of the second support 22, where the second peripheral wall 211 is the outer peripheral wall). 11 is the inner peripheral wall); External rotor motor: the inner edge of the stator core (e.g., the cross-section of the first peripheral wall 111 of the first body 11, where the first peripheral wall 111 is the inner peripheral wall), the outer edge of the rotor core (e.g., the cross-section of the second peripheral wall 211 of the second body 21, where the second peripheral wall 211 is the outer peripheral wall), the position where the inner edge of the stator core coincides with the center line of the stator teeth (e.g., the position where the cross-section of the first peripheral wall 111 of the first body 11 coincides with the central axis surface of the first support 12, where the first peripheral wall 111 is the inner peripheral wall), and the position where the outer edge of the rotor core coincides with the center line between the rotor magnetic poles (e.g., the position where the cross-section of the second peripheral wall 211 of the second body 21 coincides with the central axis surface 221 of the second support 22, where the second peripheral wall 211 is the outer peripheral wall). The shape of the holes or slots includes, but is not limited to: circular, elliptical, rectangular, trapezoidal, etc. The weight-reduction holes can be reused as heat dissipation holes, specifically: as cooling channels for coolant to flow through and accelerate heat dissipation; or for natural cooling or air cooling, they can increase the heat dissipation area. In this embodiment, weight reduction is achieved without affecting the magnetic field distribution and magnetic circuit saturation, or sacrificing the efficiency, peak power, or other performance characteristics of the motor / assist unit 1000. This allows for an increase in the torque density and power density of the motor / assist unit 1000, thereby enhancing the competitiveness of the assist unit 1000 (for example, by integrating assist and transmission without increasing the size of the assist unit 1000).

[0109] In some embodiments, openings are provided on the motor rotor (with support provided in areas other than the openings to consider shaft mounting strength) and stator (within the housing) at locations where no magnetic lines of force pass (the outer edge of the rotor coinciding with the tooth centerline / the inner edge of the stator coinciding with the tooth centerline) to reduce weight (the openings at these locations can also form a larger heat dissipation channel with the housing and gear shaft). This can reduce weight by about 5% and help improve the motor's heat dissipation effect, greatly improving the user experience. This allows the power unit 100 (such as a motor) of this application to be applied to electric bicycles (a type of vehicle 3000) that require assistance and speed change but do not want to increase the weight of the assistance unit 1000.

[0110] The following describes the assist unit 1000 of this application.

[0111] Please see Figure 11 As shown, an embodiment of this application proposes an assist unit 1000, including an actuator 200 and a power device 100 as described in the foregoing embodiments. The power device 100 has a power output shaft 101, which is connected to the actuator 200 to drive the actuator 200 to move.

[0112] As can be seen from the above, the solution using the assist unit 1000 of this application can achieve the beneficial effects of the power device 100, the beneficial effects of which will not be elaborated here. The assist unit 1000 of this application is lightweight and can achieve a preset rated power. The power device 100 can achieve a preset power output and drive the actuator 200 to achieve the required movement. Without sacrificing the efficiency and peak power of the assist unit 1000, and without affecting the magnetic field distribution and ensuring magnetic circuit saturation, the assist unit 1000 of this application can achieve weight reduction, thereby improving the torque density and power density of the assist unit 1000 and enhancing its core competitiveness.

[0113] The vehicle 3000 of this application will now be described.

[0114] Please see Figure 12 As shown, an embodiment of this application proposes a vehicle 3000, including the power assist unit 1000 and a walking device 3100 as described in the previous embodiment. The walking device 3100 is connected to the power assist unit 1000 to receive assistance from the power assist unit 1000. For example, the walking device 3100 is a wheel.

[0115] As can be seen from the above, the vehicle 3000 using this application has the beneficial effects of the assist unit 1000 in the aforementioned embodiments, enabling the vehicle 3000 to have efficient power output and providing assistance to the walking device 3100, making it easier for the user to use. The vehicle 3000 of this application is particularly suitable for electric-assisted bicycles.

[0116] The movable device 4000 of this application will now be described.

[0117] Please see Figure 13 As shown, an embodiment of this application proposes a mobile device 4000, including a power unit 100 and a thrust unit as described in the previous embodiment. The thrust unit is connected to the power unit 100 to receive power from the power unit 100. It should be noted that the mobile device 4000 can be a gimbal, an aircraft such as a drone (agricultural drone, industrial drone, consumer drone) or a manned / cargo aircraft, a ground mobile robot (sweeper, lawnmower, etc.) or other intelligent robots, etc. In a specific embodiment, taking... Figure 13 For example, each arm of the drone is equipped with a power unit 100, which can drive the propeller to take off.

[0118] Alternatively, in other embodiments, the movable device 4000 may include the assist unit 1000 of the aforementioned embodiments.

[0119] As can be seen from the above, the mobile device 4000 of this application has a high-performance power unit 100, which can realize the stable and rapid movement of the mobile device 4000.

[0120] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A power unit, characterized in that, include: The first component has a ring-shaped structure and is arranged around a first axis. The first component includes a first body and one or more first support portions, and the first side of the one or more first support portions is connected to the first body. The second component has a ring-shaped structure and is coaxially arranged with the first component. The second component includes a second body and one or more second support portions. The first side of the one or more second support portions is connected to the second body. An air gap is included between the second component and the first component to allow the second component to move relative to the first component. The second side of the first support portion and the second side of the second support portion are both arranged toward the air gap. as well as The weight-reducing section includes a first weight-reducing section and / or a second weight-reducing section; wherein, The first weight-reducing part is located at a first preset position, which includes the position where the first peripheral wall of the first body away from the air gap coincides with the central axis surface of the first support part, and the central axis surface of the first support part is parallel to the first axis. And / or, The second weight-reducing part is located at a second preset position, which includes the position where the second peripheral wall of the second body away from the air gap coincides with the central axis surface of the second support part, and the central axis surface of the second support part is parallel to the first axis.

2. The power unit as described in claim 1, characterized in that, When the first weight-reducing part is located at the first preset position, at least a portion of the first weight-reducing part is located at the first preset position, or the geometric center of the first weight-reducing part is approximately located on the central axis surface of the first support part; and / or When the second weight-reducing part is located in the second preset position, at least a portion of the second weight-reducing part is located in the second preset position or the geometric center of the second weight-reducing part is approximately located on the central axis surface of the second support part.

3. The power unit as described in claim 1, characterized in that, The first component is a fixed part, the second component is a movable part, the first peripheral wall is an outer peripheral wall, and the second peripheral wall is an inner peripheral wall; or, the first component is a movable part, the second component is a fixed part, the first peripheral wall is an inner peripheral wall, and the second peripheral wall is an outer peripheral wall.

4. The power unit as described in claim 3, characterized in that, The fixed part is a stator, and the movable part is a rotor.

5. The power unit as described in claim 3, characterized in that, The fixing part is made of iron core. The first body includes the fixing part iron core body and the first support part includes the fixing part iron core teeth for carrying the coil, or the plurality of first support parts form a first groove for carrying the permanent magnet. And / or, the material of the movable part includes an iron core, the second body includes the movable part iron core body, the second support part includes the movable part iron core teeth for carrying the coil, or a second groove is formed between the plurality of second support parts for carrying the permanent magnet; At least one of the first support portion and the second support portion is used to carry the coil.

6. The power unit as described in claim 3, characterized in that, The first component is located radially outside the second component. In addition to the first peripheral wall of the first component, a housing is also included. A first heat dissipation channel is formed between the first weight-reducing part and the third peripheral wall of the housing. And / or, within the second peripheral wall of the second component, a power shaft is also included. The central axis of the power shaft is the first shaft. A second heat dissipation channel is formed between the second weight-reducing part and the fourth peripheral wall of the power shaft.

7. The power unit as described in claim 1 or 2, characterized in that, The first body is integrally formed on the side away from the air gap, or one or more of the first supports are interconnected on their first sides to form the first body; and / or, the second body is integrally formed on the side away from the air gap, or one or more of the second supports are interconnected on their first sides to form the second body.

8. The power unit as described in claim 7, characterized in that, The first weight-reducing portion is located in a non-connected region of the first body's first peripheral wall away from the air gap; and / or, the second weight-reducing portion is located in a non-connected region of the second body's second peripheral wall away from the air gap.

9. The power unit as described in claim 1 or 2, characterized in that, The first weight-reducing part includes a plurality of first weight-reducing units, and a plurality of first support parts are respectively arranged in a one-to-one correspondence with the plurality of first weight-reducing units. The geometric center of each first weight-reducing unit is approximately located on the central axis plane of the corresponding first support part, and the plurality of first weight-reducing parts have the same shape and are arranged rotationally symmetrically; or, the second weight-reducing part includes a plurality of second weight-reducing units, and a plurality of second support parts are respectively arranged in a one-to-one correspondence with the plurality of second weight-reducing units. The geometric center of each second weight-reducing unit is approximately located on the central axis plane of the corresponding second support part, and the plurality of second weight-reducing parts have the same shape and are arranged rotationally symmetrically.

10. The power unit as claimed in claim 1, characterized in that, The cross-sectional shape of the weight-reducing part includes at least one of the following: circular, semi-circular, elliptical, trapezoidal, square, triangular, or irregular; and / or, The maximum length of the first weight-reducing part along the radial direction of the first component is less than the first preset radial length, and the maximum length of the first weight-reducing part along the circumferential direction of the first component is less than the first preset circumferential length; and / or, the maximum length of the second weight-reducing part along the radial direction of the second component is less than the second preset radial length, and the maximum length of the second weight-reducing part along the circumferential direction of the second component is less than the second preset circumferential length.

11. The power unit as claimed in claim 1, characterized in that, The magnetic flux density at the locations of the first and second weight reduction parts is less than a preset threshold.

12. The power unit as described in claim 11, characterized in that, The magnetic flux density is positively correlated with the rated power of the power unit; and / or, the magnetic flux density is negatively correlated with the radial dimension of the power unit; and / or The preset threshold is negatively correlated with the rated power of the power unit; and / or, the preset threshold is positively correlated with the radial dimension of the power unit.

13. The power unit as described in claim 11, characterized in that, The preset threshold is 0.1T to 1T.

14. The power unit as described in claim 13, characterized in that, The first weight-reducing part is located in the region where the magnetic flux density of the first component is 0; and / or, the second weight-reducing part is located in the region where the magnetic flux density of the second component is 0.

15. A power assist unit, characterized in that, The device includes an actuator and a power unit as described in any one of claims 1 to 14, the power unit having a power output shaft connected to the actuator to drive the actuator to move.

16. A vehicle, characterized in that, include: The assist unit as described in claim 15, and A walking device is connected to the assist unit to receive assistance from the assist unit.

17. A movable device, characterized in that, Includes the power unit as described in any one of claims 1 to 14; and A thrust device is connected to the power unit to receive power from the power unit.

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