electric drive device

Abstract

This disclosure discloses an electric drive device comprising: a motor housing; a stator assembly fixedly mounted relative to the motor housing and including a main iron core with an annular structure; a rotor assembly rotatably supported relative to the stator assembly within the motor housing and including a rotor support and a main magnet fixedly mounted on the rotor support, wherein the rotor support is fixedly mounted relative to the motor housing in an axial direction; and a clutch device including a clutch iron core, a clutch coil, and an armature arranged in the stator assembly, wherein the main iron core and the main magnet are arranged adjacent to each other in an axial direction at a distance.

Description

Technical Field

[0001] This disclosure relates to an electric drive device. Background Technology

[0002] Currently, most motors used in robotic dexterous hands are brushless motors and coreless motors. When a robot grasps an object with its dexterous hand, a certain holding torque is required, but current solutions on the market cannot meet this requirement. For example, when a dexterous hand needs to grasp an object and hold it in a certain position, some existing designs directly apply direct current to the motor to generate the holding force. However, this often leads to a dramatic temperature rise, making it impossible for the motor to operate in this state for extended periods. In such cases, if the motor surface can provide sufficient heat dissipation area, a heat dissipation structure can be added to the outside of the casing to ensure that the overall temperature rise does not become excessive. However, for robotic dexterous hands, due to space constraints, the axial length of the motor should be as short as possible, and the diameter is typically required to be below 18mm. For robotic dexterous hands, the size of the motor directly affects the accuracy and sensitivity of the grasping action. If a heat dissipation structure is to be added to the outside of the casing, the radial dimension of the motor needs to be sacrificed. The smaller the size of the motor used in the robot's dexterous hand, the more severe the heat generation will be under the same power consumption. In order to keep the temperature rise from being too high, the radial dimension needs to be reduced, which in turn requires increasing the axial length to increase the size of the motor.

[0003] In summary, traditional motor designs cannot meet the requirement of maintaining a certain holding torque for a long time without causing excessive temperature rise. Utility Model Content

[0004] In response to the problems and needs mentioned above, this disclosure proposes an electric drive device, which includes:

[0005] The motor housing; a stator assembly fixedly mounted relative to the motor housing and including a main iron core with an annular structure; a rotor assembly rotatably supported relative to the stator assembly within the motor housing and including a rotor support and a main magnet fixedly mounted on the rotor support, wherein the rotor support is fixedly mounted relative to the motor housing in an axial direction; and a clutch device including a clutch iron core, a clutch coil, and an armature arranged in the stator assembly, wherein the main iron core and the main magnet are arranged adjacent to each other in an axial direction at a distance.

[0006] According to this disclosure, the clutch device is configured to switch between a released state and a self-locking state, wherein in the released state, the rotor assembly is allowed to rotate freely relative to the stator assembly; and in the self-locking state, the rotor assembly is prevented from rotating freely relative to the stator assembly.

[0007] According to this disclosure, the armature is axially movable relative to the clutch core, wherein, in the released state of the clutch device, the axial clearance between the armature and the clutch core is not zero, and in the self-locking state of the clutch device, the axial clearance between the armature and the clutch core is zero.

[0008] According to this disclosure, the clutch device further includes a leaf spring, one end of which is fixedly connected to the rotor support, and the other end of which applies a preload force to the armature so that the armature tends to move toward the rotor support in the axial direction.

[0009] According to this disclosure, the clutch device is configured such that the clutch core generates an induced magnetic field when the clutch coil is energized, and the induced magnetic field causes the armature to overcome the preload of the leaf spring and move toward the clutch core in the axial direction.

[0010] According to this disclosure, the clutch device is configured such that when the clutch coil is de-energized, the induced magnetic field of the clutch core disappears, and the armature moves axially away from the clutch core under the preload of the leaf spring.

[0011] According to this disclosure, the clutch core is arranged radially inside the main core.

[0012] According to this disclosure, the armature is arranged radially inside the main magnet.

[0013] According to this disclosure, the electric drive device includes a preload nut by means of which one end of the rotor assembly is rotatably connected to the motor housing and prevents the rotor support from moving in the axial direction.

[0014] According to this disclosure, the stator assembly includes a first contact surface facing the rotor assembly, and the rotor assembly includes a second contact surface facing the stator assembly, wherein a metal segment is embedded in the first contact surface and / or the second contact surface.

[0015] According to this disclosure, the metal section is made of aluminum.

[0016] According to this disclosure, a metal segment is embedded in the first contact surface or the second contact surface, and a potting portion is provided on the second contact surface or the first contact surface.

[0017] According to this disclosure, a metal segment is embedded in the first contact surface or the second contact surface, and the second contact surface or the first contact surface is surface roughened.

[0018] According to this disclosure, the surface roughening treatment includes sandblasting.

[0019] According to this disclosure, the axial clearance is at most 0.1 mm to 1 mm.

[0020] According to this disclosure, the axial clearance is at most 0.1 mm to 0.5 mm.

[0021] According to this disclosure, the stator assembly includes a first module and a second module that are pluggable along the axial direction, wherein the first module includes a main core yoke and a clutch core fixedly connected to the center of the main core yoke; and wherein the second module includes an insulating support and a plurality of main cores fixedly connected to the insulating support.

[0022] According to this disclosure, the main core includes a core head fixedly connected to the insulating support and a free end protruding outward from the insulating support.

[0023] According to this disclosure, the main core yoke includes a plurality of yoke through holes for accommodating the free ends of the main core.

[0024] According to this disclosure, the insulating support includes a plurality of support holes, wherein the core head of the main core is engaged in the support holes and a slot is formed between adjacent core heads.

[0025] According to this disclosure, the second module further includes a pre-formed main coil, wherein the main coil includes a coil frame made of insulating material and a main body wound on the coil frame.

[0026] According to this disclosure, the main coil can be inserted into the free end of the main iron core.

[0027] According to this disclosure, the first module further includes a clutch coil wound on the clutch core.

[0028] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0030] Figure 1 An exploded view schematically illustrates an electric drive device according to one embodiment of the present disclosure;

[0031] Figure 2 The schematic diagram shows a cross-sectional view of the clutch coil of an electric drive device according to an embodiment of the present disclosure in an energized state.

[0032] Figure 3 schematically shown Figure 2 A cross-sectional view of the electric drive device with the clutch coil de-energized.

[0033] Figure 4 schematically shown Figure 1 A partial cross-sectional view of the stator assembly of the electric drive device shown;

[0034] Figure 5 The schematic diagram shows a cross-sectional view of the clutch coil of an electric drive device according to an embodiment of the present disclosure in an energized state.

[0035] Figure 6 schematically shown Figure 5 A cross-sectional view of the electric drive device with the clutch coil de-energized.

[0036] Figure 7 A perspective view schematically illustrating a portion of a stator core according to another embodiment of the present disclosure;

[0037] Figure 8 A perspective view schematically illustrating a portion of a stator core according to another embodiment of the present disclosure;

[0038] Figure 9 A perspective view of a main iron core according to one embodiment of the present disclosure is shown schematically;

[0039] Figure 10 A perspective view of the main coil according to one embodiment of the present disclosure is schematically shown;

[0040] Figure 11 This schematically illustrates an assembly diagram of some components of a stator core according to one embodiment of the present disclosure; and

[0041] Figure 12 An assembly diagram of some components of a stator assembly according to one embodiment of the present disclosure is shown schematically. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0043] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0044] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, which may change accordingly when the absolute position of the described object changes.

[0045] Figure 1 An exploded view schematically illustrates an electric drive device according to one embodiment of the present disclosure. Figure 1 As shown, the electric drive device includes a motor housing 1, a front bearing 2, a stator assembly 3, a rotor assembly 4, a rear bearing 5, and a preload nut 6. The stator assembly 3 is fixedly mounted relative to the motor housing 1, and the rotor assembly 4 is rotatably supported on the motor housing 1 relative to the stator assembly 3 by means of the front bearing 2 and the rear bearing 5. Figure 2 and Figure 3 As shown, the stator assembly 3 and the rotor assembly 4 are arranged adjacent to each other along the axial direction x.

[0046] According to one embodiment, both the front bearing 2 and the rear bearing 5 can be constructed as rolling bearings to provide stable and low-friction rotatable support for the rotor assembly 4. For example, the front bearing 2 can be constructed as a roller bearing. The front bearing 2 includes a front bearing inner ring 21, a front bearing outer ring 22, and a plurality of front rolling elements 23 disposed between the front bearing inner ring 21 and the front bearing outer ring 22. The rear bearing 5 may include a rear bearing inner ring 51, a rear bearing outer ring 52, and a plurality of rear rolling elements 53 disposed between the rear bearing inner ring 51 and the rear bearing outer ring 52.

[0047] The stator assembly 3 includes a stator core 30, a main coil 31, and a potting section not specifically shown.

[0048] In one embodiment, the stator core 30 of the stator assembly 3 includes a disc-shaped main core yoke 300 and a plurality of main cores 301 dispersedly arranged on the main core yoke 300, wherein these main cores 301 are arranged at uniform intervals. For example, in... Figure 7 In the illustrated embodiment, six main iron cores 301 are arranged on the main iron core yoke 300. These main iron cores 301 are distributed along a circular trajectory on the end face of the main iron core yoke 300 at a uniform angular spacing, i.e., an angular spacing of 60°. A corresponding main coil 31 is wound on each main iron core 301.

[0049] In one implementation, such as Figure 5 As shown, the rotor assembly 4 includes a rotor support 40, a main magnet 41 fixedly arranged on the rotor support 40, a motor shaft 42 and a journal 43 extending from the rotor support 40 in the axial direction x to both ends.

[0050] When the main coil 31 of the electric drive device is energized, the stator core 30 is excited to generate a changing magnetic field. As a result, the main magnet 41 moves with the magnetic field, thereby causing the rotor assembly 4 to move.

[0051] For small-sized electric drive devices, such as those used in robotic dexterous hands, when the dexterous hand needs to grasp an object and hold it in a certain state, existing technologies often directly apply direct current to generate holding force. However, this process often leads to a dramatic temperature rise, making it impossible for the electric drive device to operate in this state for extended periods. Furthermore, due to limited structural space, it is not possible to install additional cooling devices for the electric drive device. Therefore, the electric drive device according to this disclosure also includes a clutch mechanism.

[0052] The clutch device includes a clutch core 302 and a clutch coil 32 disposed in the stator assembly 3. The clutch core 302 is disposed at the center of the main core yoke 300, wherein the clutch coil 32 is sleeved on the clutch core 302. The clutch device also includes an armature 44 movable in the axial direction x relative to the rotor support 40, the armature 44 being disposed on the side of the rotor support 40 facing the stator assembly 3. The clutch device also includes a leaf spring support 45 fixedly mounted on the rotor support 40 and a leaf spring 46 movably connected to the leaf spring support 45. Alternatively, the leaf spring support 45 itself may be part of the rotor support 40. Figure 5 and Figure 6As shown, the main magnet 41 is constructed in a ring shape, and the armature 44, the leaf spring support 45, and the leaf spring 46 arranged on the leaf spring support 45 are arranged radially inside the main magnet 41. One end of the leaf spring 46 is fixedly connected to the leaf spring support 45, and the free end of the leaf spring 46 is connected to the armature 44, and a preload is applied to the armature 44 so that the armature 44 tends to move towards the rotor support 40 in the axial direction x.

[0053] In the assembled state, the stator assembly 3 is fixedly arranged relative to the motor housing 1, and the motor shaft 42 at one end of the rotor assembly 4 is supported by a front bearing 2. The journal 43 at the other end of the rotor assembly 4 is inserted into and passes through the annular clutch core 302 of the stator assembly 3, and the free end of the journal 43 is rotatably supported on the motor housing 1 by means of a rear bearing 5. Here, the free end of the journal 43 is rotatably mounted on the motor housing 1 by means of a preload nut 6, thereby limiting the displacement of the rotor support 40 in the axial direction x. The main magnet 41 and armature 44 of the rotor assembly 4 are respectively arranged adjacent to the stator assembly 3 in the axial direction x, wherein the main core 301 of the stator assembly 3, together with the main coil 31 sleeved on the main core 301, is approximately in the same radial position as the main magnet 41 of the rotor assembly 4; and the clutch core 302 of the stator assembly 3, together with the clutch coil 32 sleeved on the clutch core 302, is approximately in the same radial position as the armature 44 of the rotor assembly 4. Compared to a radial motor, in the electric drive device according to this disclosure, the effective magnetic surface area is the surface of the end face of the rotor assembly 4, rather than its outer peripheral surface. Therefore, given a fixed volume of the electric drive device, the electric drive device according to this disclosure can provide greater torque.

[0054] Since the preload nut 6 restricts the displacement of the rotor support 40 of the rotor assembly 4 together with the motor shaft 42 and journal 43 fixedly connected thereto in the axial direction x, the main magnet 41 fixedly connected to the rotor support 40 is also positioned relative to the motor housing 1 in the axial direction x, wherein the main magnet 41 is positioned at a distance relative to the main iron core 301 of the stator assembly 3.

[0055] Unlike the main magnet 41, the armature 44 is movable relative to the rotor support 40. Energizing the clutch coil 32 excites the clutch core 302 to generate an induced magnetic field. Under the influence of this induced magnetic field, the armature 44 overcomes the preload of the leaf spring 46 and moves towards the clutch core 302. This creates a variable axial clearance b between the armature 44 and the clutch core 302. Thus, by means of the clutch mechanism's engagement and disengagement, the armature 44 of the rotor assembly 4 is allowed to move axially (x) relative to the clutch core 302 of the stator assembly 3, and the axial clearance b changes accordingly. When the axial clearance b between the armature 44 and the clutch core 302 decreases to zero, the armature 44 and the clutch core 302 engage, thereby preventing the rotor assembly 4 from rotating freely relative to the stator assembly 3; when the axial clearance b between the armature 44 and the clutch core 302 increases, the armature 44 disengages from the clutch core 302, thereby allowing the rotor assembly 4 to rotate freely relative to the stator assembly 3.

[0056] The following uses Figure 2 and Figure 3 Describe the working process of the clutch mechanism.

[0057] like Figure 3 As shown, in the released state of the clutch device, the clutch coil 32 is de-energized, and the axial gap b between the opposing end faces of the clutch core 302 and the armature 44 is not zero, that is, a gap is maintained between the opposing end faces of the clutch core 302 and the armature 44 that allows the rotor assembly 4 to rotate freely.

[0058] like Figure 2 As shown, in the self-locking state of the clutch device, the clutch coil 32 is energized, and the axial gap b between the opposing end faces of the stator assembly 3 and the rotor assembly 4 is zero, so that the opposing end faces of the clutch core 302 and the armature 44 are tightly fitted together, and the rotor assembly 4 is prevented from rotating freely by means of the friction between them.

[0059] When the rotor assembly 4 is required to operate normally, the main coil 31 of the stator assembly 3 is directly energized. In this case, the armature 44 maintains a non-zero axial clearance b relative to the clutch core 302 under the preload of the leaf spring 46, thereby allowing the rotor assembly 4 to rotate relative to the stator assembly 3.

[0060] When rotor assembly 4 needs to stop rotating, for example when the robot's dexterous hand using this electric drive needs to perform a holding action, the electric drive should be switched off. Figure 3 The clutch release state shown is converted to Figure 2The clutch mechanism shown is self-locking. To achieve this, a short direct current is first applied to the main coil 31, for example, only for a few seconds, to quickly reduce the high speed of the electric drive to 0 rpm. Then, the clutch coil 32 is energized, generating an induced magnetic field at the clutch core 302. Under the influence of this induced magnetic field, the armature 44, associated with the rotor assembly 4, overcomes the tension of the leaf spring 46 and moves axially towards the clutch core 302, ultimately causing the opposing end faces of the armature 44 and the clutch core 302 to engage. This achieves self-locking of the clutch mechanism. Finally, the main coil 31 is de-energized.

[0061] According to this disclosure, the clutch core 302 and clutch coil 32 are integrated in the stator assembly 3, while the armature 44, leaf spring bracket 45, and leaf spring 46 are integrated in the rotor assembly 4. Compared to achieving actuation retention by directly supplying DC current to the main coil 31, the self-locking of the clutch device according to this disclosure can achieve a larger holding torque and avoids the need for continuous DC current supply to the main winding for a long time to provide torque output for the rotation of the electric drive device, thereby preventing the main coil 31 from overheating and even burning out the electric drive device. According to this disclosure, after the rotor assembly 4 is locked with the stator assembly 3, no current flows through the main coil 31, avoiding the situation where a large DC current is supplied for a long time, generating heat.

[0062] Furthermore, according to this disclosure, a clutch core 302 and a clutch coil 32 are added radially inside the stator assembly 3. The rotor assembly 4 is first briefly stalled by a short-term direct current supply, and then the clutch device is used for engagement. This allows axial engagement only after the rotor assembly 4 has completely stopped. Static friction is generated between the opposing end faces of the rotor assembly 4 and the stator assembly 3 as contact surfaces, achieving the purpose of clutch retention and preventing short-term dynamic friction and wear on the contact surfaces caused by the rotor assembly 4 not completely stopping. Wear on the contact surfaces reduces the coefficient of friction, thus reducing the holding torque. Furthermore, the particles generated by the wear may affect the normal operation of the motor, causing noise or even abnormal current.

[0063] According to the structure of the clutch device disclosed herein, the robot's dexterous hand does not require additional power to the electric drive device when maintaining its movement, allowing it to maintain movement for extended periods without generating additional heat. This eliminates the need for an external heat dissipation device, further reducing the radial dimension and allowing for a reduction of over 10% in the diameter of the dexterous hand's fingers. This solution also fully utilizes the structural characteristics of the electric drive device, placing the clutch core 302 of the clutch device radially within the stator assembly 3, eliminating the need to occupy the already extremely limited axial space and further reducing axial dimension requirements. Correspondingly, the reduction in both the axial and radial dimensions of the dexterous hand further improves the object-grabbing accuracy.

[0064] According to this disclosure, the end face of the stator assembly 3 facing the rotor assembly 4 forms a first contact surface of the clutch device, and the end face of the rotor assembly 4 facing the stator assembly 3 forms a second contact surface of the clutch device. To achieve a stable and secure frictional engagement between the stator assembly 3 and the rotor assembly 4, the coefficient of friction between the first and second contact surfaces should be increased.

[0065] Therefore, metal segments, such as aluminum segments, can be fitted into the first contact surface and / or the second contact surface to increase the coefficient of friction between the first contact surface and the second contact surface.

[0066] As an alternative or supplement, a metal segment can be fitted onto the first contact surface or the second contact surface, and a potting portion can be provided accordingly on the second contact surface. This increases the coefficient of friction between the first contact surface and the second contact surface.

[0067] As an alternative or supplement, other surface treatments can be applied to the first and / or second contact surfaces to improve their surface roughness. For example, sandblasting or other treatments can be applied to the first and / or second contact surfaces. This increases the coefficient of friction between the first and second contact surfaces.

[0068] According to this disclosure, two bearings are used, namely a front bearing 2 and a rear bearing 5. This achieves more stable and smoother support for the rotor assembly 4.

[0069] Preferably, the axial clearance b is set to a maximum of 0.1 mm to 1 mm, which ensures that the rotor assembly 4 and the stator assembly 3 are fully separated when the electric drive device is rotating, and avoids accidental frictional resistance between the rotor assembly 4 and the stator assembly 3.

[0070] More preferably, the axial clearance b is set to a maximum of 0.1 mm to 0.5 mm. This ensures the clearance required when the electric drive device is rotating, and also allows the main magnet 41 to better sense the alternating magnetic field generated by the energized main coil 31, reducing magnetic circuit losses. Furthermore, when the maximum axial clearance b is within this range, commercially available standard bearings can be used, thereby reducing research and development and manufacturing costs.

[0071] In one embodiment of the present disclosure, the stator assembly 3 includes a stator core 30, a main coil 31, a clutch coil 32, and a potting portion.

[0072] like Figure 7 As shown, the stator core 30 includes a disc-shaped main core yoke 300 and a plurality of main cores 301 dispersedly arranged on the main core yoke 300, and a clutch core 302 arranged at the center of the main core yoke 300. These main cores 301 are arranged at uniform intervals. For example, in... Figure 7In the illustrated embodiment, six main iron cores 301 are arranged on the main iron core yoke 300. These main iron cores 301 are distributed along a circular trajectory on the end face of the main iron core yoke 300 at a uniform angular spacing, i.e., an angular spacing of 60°. Narrow slots 303 are formed between adjacent main iron cores 301.

[0073] To achieve better operational smoothness, the cogging torque of the electric drive device should be reduced. This requires a smaller slot width 303 between the main cores 301. Furthermore, reducing the slot width 303 also yields higher torque performance. However, in a monolithic core, reducing the slot width increases the winding difficulty of the coils and makes it difficult to improve the slot fill factor. Therefore, the stator assembly 3 according to this disclosure includes a modularly constructed stator core 30.

[0074] exist Figures 7 to 12 In the illustrated embodiment, the stator assembly 3 comprises a first module 3A and a second module 3B that can be plugged into each other along the axial direction x. The first module 3A includes an annular insulating support 304 and a plurality of main iron cores 301 fixedly mounted relative to the insulating support 304. A plurality of support holes 3041 are provided on the insulating support 304, and each main iron core 301 is correspondingly fitted into the support hole 3041.

[0075] like Figure 9 As shown, each main core 301 includes an arc-shaped main core head and a rod-shaped core body. Each main core 301 is secured at one end of its main core head into a support through-hole 3041 of the insulating support 304, and the rod-shaped core body protrudes outward from the support through-hole 3041. This creates a narrow slot 303 between adjacent main core heads, achieving good operational smoothness and higher torque performance. Furthermore, the free end of the core body protrudes outward, allowing winding from the free end of the core body, thereby reducing installation difficulty.

[0076] The following uses Figures 8 to 12 The structure and assembly process of a stator assembly 3 according to one embodiment of the present disclosure are described.

[0077] like Figure 8 As shown, the stator core 30 includes an integrated main core yoke 300 and a clutch core 302. For example, the main core yoke 300 can be integrally constructed with the clutch core 302. A clutch coil 32 is securely wound around the clutch core 302 to form the first module 3A of the stator assembly 3.

[0078] Figure 10The main coil 31 is schematically shown. The main coil 31 includes a hollow coil frame 310 made of insulating material and a main body 311 made of conductive material. The main body 311 may be made of enameled wire or other conductor wire, wherein the main body 311 is securely wound on the coil frame 310 to form the main coil 31.

[0079] Subsequently, as Figure 11 As shown, the formed main coil 31 is inserted into the core body of the main iron core 301, which is already fixed on the insulating bracket 304. This forms the second module 3B of the stator assembly 3.

[0080] Finally, as Figure 12 As shown, the first module 3A and the second module 3B are interlocked along the axial direction x, such that the free end of the main core 301 in the second module 3B is inserted into the yoke through hole 3001 of the main core yoke 300 of the first module 3A. This forms the stator assembly 3.

[0081] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. An electric drive device, comprising: Motor housing (1); Stator assembly (3), which is fixedly mounted relative to motor housing (1) and includes a main iron core (301) with an annular structure; A rotor assembly (4), rotatably supported relative to the stator assembly (3) within the motor housing (1), includes a rotor bracket (40) and a main magnet (41) fixedly mounted on the rotor bracket (40), wherein the rotor bracket (40) is fixedly mounted relative to the motor housing (1) in the axial direction (x); and The clutch device includes a clutch core (302) arranged in the stator assembly (3), a clutch coil (32) and an armature (44) arranged in the rotor assembly (4). The main iron core (301) and the main magnet (41) are arranged adjacent to each other in the axial direction (x) with a distance between them.

2. The electric drive device according to claim 1, characterized in that, The clutch device is configured to switch between a released state and a self-locking state, in which the rotor assembly (4) is allowed to rotate freely relative to the stator assembly (3) in the released state; and in the self-locking state, the rotor assembly (4) is prevented from rotating freely relative to the stator assembly (3).

3. The electric drive device according to claim 2, characterized in that, The armature (44) is movable relative to the clutch core (302) in the axial direction (x), wherein, in the released state of the clutch device, the axial clearance (b) between the armature (44) and the clutch core (302) is not zero, and in the self-locking state of the clutch device, the axial clearance (b) between the armature (44) and the clutch core (302) is zero.

4. The electric drive device according to claim 3, characterized in that, The clutch device also includes a leaf spring (46), one end of which is fixedly connected to the rotor support (40), and the other end applies a preload to the armature (44) so ​​that the armature (44) tends to move toward the rotor support (40) along the axial direction (x).

5. The electric drive device according to claim 4, characterized in that, The clutch device is configured such that the clutch core (302) generates an induced magnetic field when the clutch coil (32) is energized. The induced magnetic field causes the armature (44) to overcome the preload of the leaf spring (46) and move toward the clutch core (302) in the axial direction (x).

6. The electric drive device according to claim 4, characterized in that, The clutch device is configured such that when the clutch coil (32) is de-energized, the induced magnetic field of the clutch core (302) disappears, and the armature (44) moves away from the clutch core (302) along the axial direction (x) under the pre-tension of the leaf spring (46).

7. The electric drive device according to claim 3, characterized in that, The clutch core (302) is arranged radially inside the main core (301).

8. The electric drive device according to claim 3, characterized in that, The armature (44) is arranged radially inside the main magnet (41).

9. The electric drive device according to claim 1, characterized in that, The electric drive device includes a preload nut (6) by means of which one end of the rotor assembly (4) is rotatably connected to the motor housing (1) and prevents the rotor support (40) from moving in the axial direction (x).

10. The electric drive device according to claim 1, characterized in that, The stator assembly (3) includes a first contact surface facing the rotor assembly (4), and the rotor assembly (4) includes a second contact surface facing the stator assembly (3), wherein a metal segment is embedded in the first contact surface and / or the second contact surface.

11. The electric drive device according to claim 10, characterized in that, The metal section is made of aluminum.

12. The electric drive device according to claim 10, characterized in that, A metal segment is embedded in the first contact surface or the second contact surface, and a potting portion is provided on the second contact surface or the first contact surface.

13. The electric drive device according to claim 10, characterized in that, A metal segment is embedded in the first or second contact surface, and the second or first contact surface is surface roughened.

14. The electric drive device according to claim 13, characterized in that, The surface roughening treatment includes sandblasting.

15. The electric drive device according to claim 3, characterized in that, The axial clearance (b) is at most 0.1 mm to 1 mm.

16. The electric drive device according to claim 3, characterized in that, The axial clearance (b) is at most 0.1 mm to 0.5 mm.

17. The electric drive device according to claim 1, characterized in that, The stator assembly (3) includes a first module (3A) and a second module (3B) that are pluggable along the axial direction (x), wherein the first module (3A) includes a main core yoke (300) and a clutch core (302) fixedly connected to the center of the main core yoke (300); and wherein the second module (3B) includes an insulating support (304) and a plurality of main cores (301) fixedly connected to the insulating support (304).

18. The electric drive device according to claim 17, characterized in that, The main core (301) includes a core head fixedly connected to the insulating support (304) and a free end protruding outward from the insulating support (304).

19. The electric drive device according to claim 18, characterized in that, The main core yoke (300) includes a plurality of yoke perforations (3001) for accommodating the free ends of the main core (301).

20. The electric drive device according to claim 18, characterized in that, The insulating support (304) includes a plurality of support holes (3041), wherein the core head of the main core (301) is engaged in the support holes (3041) and a slot (303) is formed between adjacent core heads.

21. The electric drive device according to claim 20, characterized in that, The second module (3B) also includes a pre-formed main coil (31), wherein the main coil (31) includes a coil frame (310) made of insulating material and a main body (311) wound on the coil frame (310).

22. The electric drive device according to claim 21, characterized in that, The main coil (31) can be inserted into the free end of the main iron core (301).

23. The electric drive device according to claim 17, characterized in that, The first module (3A) also includes a clutch coil (32) wound on the clutch core (302).

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