Support frame for motor rotor and motor

Abstract

The invention relates to a support frame for a motor rotor and a motor, the rotor is an outer rotor, and the support frame comprises a first end and a second end and is composed of a cylindrical part and an end face part located at one end of the cylindrical part. The supporting frame is connected with the rotor so that the supporting frame can rotate together with the rotor, the wall thickness between the first end and the second end changes in the mode that the wall thickness between the first end and the second end is gradually reduced from the first end to the second end, and the second end is the power output end of the rotor. The invention further provides a double-motor device, the double motors are provided with the inner motor and the outer motor, the inner motor and the outer motor can operate in different modes according to needs, layout is more compact, operation and maintenance are easy, and installation and disassembly are convenient. The thickness of the support frame is gradually changed between the two ends, so that the amplitude of one end connected with the rotor is effectively inhibited.

Description

Technical Field

[0001] The present invention relates to the field of power technology, and in particular to a support frame for a motor rotor and a motor. Background Art

[0002] Electric motors are commonly used machines that can operate in motor mode and generator mode. In some cases, two electric motors may be required. One solution is to use two separate electric motors, and the other is to integrate the two motors together. However, the space occupied by two separate motors is more dispersed, the power density is lower than that of the dual motor integrated structure, and the material consumption is higher.

[0003] The dual motor integration solution is divided into two forms: axial arrangement and radial arrangement. For the dual motors arranged axially, the space utilization is not compact enough, resulting in a large axial size of the system. For the dual motors arranged radially, one end of the stator core and one end of the outer rotor are both in a suspended state, resulting in poor operating stability of the unit. As the speed increases, the vibration increases, which seriously limits the application of the system and can only exist in small and low-speed fields. For the dual motors arranged radially with separate shafts, one end of the two motor shafts is in a suspended state, and the operating stability is poor. For the dual motors arranged radially, the inner and outer motor shafts have a supporting role, and the motor operation stability is mutually restricted. There is relative movement of the motor shaft, large mechanical loss, high load requirements on the bearings and shafts, and the dimensional matching tolerance between the two shafts in the entire range must be considered when running at different speeds. The NVH performance deteriorates, and the design and processing are difficult. Summary of the invention

[0004] In view of this, the present invention proposes the following technical solution.

[0005] A support frame for a motor rotor, wherein the rotor is an outer rotor, the support frame includes a first end and a second end, and is composed of a cylindrical portion and an end surface portion located at one end of the cylindrical portion, the support frame is connected to the rotor so that the support frame can rotate together with the rotor, and the wall thickness between the first end and the second end changes in a manner of gradually decreasing from the first end to the second end, and the second end is the power output end of the rotor.

[0006] According to an example of the present invention, the support frame is entirely composed of a solid structure, or entirely composed of a mesh structure, or composed of a solid structure located radially inward and a mesh structure located outside the solid structure.

[0007] According to an example of the present invention, the support frame is integrally formed by casting.

[0008] The present invention also provides a dual-motor device, comprising:

[0009] A housing, the housing comprising a first end cover, a cylindrical body and a second end cover;

[0010] An inner motor stator, an inner motor rotor, an outer motor rotor and an outer motor stator are contained in the housing, wherein the outer motor rotor, the outer motor stator, the inner motor stator and the inner motor rotor are sequentially arranged from the outside to the inside in the radial direction according to the mentioned order;

[0011] The above-mentioned support frame is connected to the outer motor rotor so that the support frame can rotate together with the outer motor rotor.

[0012] According to an example of the present invention, it also includes:

[0013] An inner rotor shaft, arranged radially inside the inner motor rotor and fixedly connected to the inner motor rotor;

[0014] An outer rotor output member, an end surface portion of the support frame being connected to the outer rotor output member;

[0015] The inner motor stator and the outer motor stator are respectively connected to the fixing member on both sides in the axial direction.

[0016] According to an example of the present invention, the inner motor stator and the outer motor stator are fixed to the first end cover by rods disposed therein;

[0017] An annular connecting member is also provided, the connecting member is axially located between the first end cover and the inner motor stator and the outer motor stator, and the connecting member is fixedly connected to the first end cover;

[0018] The rods are provided in plurality and are evenly distributed in the circumferential direction, and the rods are fixed to the first end cover by being fixedly connected with the connecting member.

[0019] According to an example of the present invention, the second end cover has a plate-shaped end cover body and a cylindrical portion extending axially toward the inside of the housing perpendicular to the end cover body, and the outer rotor output member is supported on the cylindrical portion through a bearing; and / or

[0020] The cylindrical portion of the support frame is rotatably supported on the cylindrical body of the housing via an outer rotor bearing, which is preferably a segmented rolling bearing.

[0021] According to an example of the present invention, the outer rotor output member is connected to an output shaft through a gear transmission device, and the output shaft passes through the second end cover.

[0022] According to an example of the present invention, the inner motor stator and the outer motor stator are fixed to the second end cover via rods disposed therein.

[0023] According to an example of the present invention, an annular member is further provided, which is provided on a cylindrical portion of the second end cover extending axially toward the inside of the shell perpendicular to the end cover body, and the rod is fixed to the second end cover by being fixed to the annular member.

[0024] As can be seen from the above, the present invention proposes a dual motor device and a support frame for the outer rotor of the dual motor device. The dual motor has an inner motor and an outer motor that can operate in different modes as needed. Compared with two separate motors, the layout is more compact, and the operation and maintenance are simple, and the installation and disassembly are convenient. In addition, the stator and the rotor are provided with support structures at both ends to ensure stable operation of the motor. The support frame adopts a gradual thickness between the two ends, so that the amplitude at the end connected to the rotor is effectively suppressed.

[0025] Other features and advantages of the present invention will be described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0027] Figure 1 A cross-sectional view of a dual motor device according to an embodiment of the present invention is shown.

[0028] Figure 2 A perspective view of a support frame for a motor rotor according to an embodiment of the present invention is shown.

[0029] Figure 3 A cross-sectional view of a support frame for a motor rotor according to an embodiment of the present invention is shown.

[0030] Figure 4 FIG. 1 is a view showing an outer rotor output member in a dual-motor device according to an embodiment of the present invention as viewed along the axial direction.

[0031] Figure 5 The assembly process of the dual-motor device according to the embodiment of the present invention is shown.

[0032] All the drawings are only schematic and not necessarily drawn to scale, and they only show those parts necessary for explaining the present invention, and other parts are omitted or only mentioned. That is, in addition to the parts shown in the drawings, the present invention may also include other parts.

[0033] In the figures, identical and / or functionally identical technical features are provided with identical or similar reference numerals. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented without some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are intended for illustration purposes only and should not be considered as features or limitations of the claims unless explicitly stated in the claims.

[0035] In the following description, the descriptions about directions, such as "upper", "lower", "inner", "outer", "radial", "axial", etc., which may be used, are only for the convenience of description, unless otherwise specified, and are not intended to form any limitation on the technical solution of the invention. In addition, in the following description, terms such as "first", "second", etc. are used to describe the elements of the present application, and these terms are only used to distinguish the elements, and are not intended to limit the nature, sequence, order or number of these elements.

[0036] Figure 1 FIG. 2 shows a cross-sectional view of a dual motor device according to an embodiment of the present invention. Figure 1 It can be seen that the dual motor device of the present invention includes two motors, which constitute a radially arranged dual motor device, and the stators and rotors of the two motors overlap at least partially in the axial direction. Specifically, in the radial direction, the rotor and stator of one motor are located inside the rotor and stator of the other motor. For the sake of simplicity of description, the two motors are also referred to as the outer motor and the inner motor according to their positional relationship. The outer motor includes an outer motor stator 15 and an outer motor rotor 4, and a first air gap 3 is provided between the outer motor stator 15 and the outer motor rotor 4. The outer motor stator 15 includes a stator core and an outer motor stator winding 1 arranged in the stator core. The inner motor includes an inner motor stator 22 and an inner motor rotor 20, and a second air gap 21 is provided between the inner motor stator 22 and the inner motor rotor 20. The inner motor stator 22 includes a stator core and an inner motor stator winding 18 arranged in the stator core. In the order from radially outside to inside, the outer motor rotor 4, the outer motor stator 15, the inner motor stator 22 and the inner motor rotor 20 are arranged in the mentioned order. Preferably, the outer motor rotor 4, the outer motor stator 15, the inner motor stator 22 and the inner motor rotor 20 are substantially overlapped in the axial direction.

[0037] The inner motor stator 22 and the outer motor stator 15 are radially adjacent. As an embodiment, the two can be made into an integrated structure. As another embodiment, the inner motor stator 22 and the outer motor stator 15 can also be formed separately and then connected and fixed using a wedge-shaped structure.

[0038] The dual motor device also includes a housing. Preferably, the housing includes a first end cover 23, a cylindrical body 8 and a second end cover 14. The cylindrical body 8 can be connected to the first end cover 23 and the second end cover 14 by a threaded member. The housing serves as a common housing for the inner motor and the outer motor mentioned above. The inner rotor 20 is fixedly connected to the inner rotor shaft 19, and the inner rotor shaft 19 is supported in the corresponding openings of the first end cover 23 and the second end cover 14 by rotor bearings 11. As a specific embodiment, the first end cover 23 has a first bearing support portion extending axially toward the inside of the housing perpendicular to the body of the end cover, and the inner rotor shaft 19 is supported by the first bearing at the position of the first bearing support portion. Preferably, in the axial direction, the position of the first bearing is substantially the same as the position of the connecting member 16 to be mentioned below.

[0039] In order to fix the inner motor stator 22 and the outer motor stator 15, a stator fixing device is provided. As a specific embodiment, the stator fixing device includes a rod 17 that passes through the inner motor stator 22 and the outer motor stator 15 in the axial direction and a connector 16 that fixes the rod 17 to a fixed member such as the first end cover 23. Specifically, the rod 17 can be a screw, and a plurality of rods 17 can be arranged in the circumferential direction, especially evenly arranged in the circumferential direction. The connector 16 can be set as an annular plate-like member, fixed to the fixed member by a threaded connector, etc., and the rod 17 can also be fixed to the connector 16 by a threaded fastener. Although the rod 17 can also be directly connected to the fixed member, due to the certain distance between the end of the stator and the fixed member such as the motor housing, the direct connection will result in a longer length of the rod 17. Therefore, by providing an annular connector 16 to reduce the axial length of the rod 17, the rigidity of the iron core can be enhanced and the vibration can be reduced during operation. Preferably, the distance from the connector 16 to the fixed member is substantially equal to the distance to the end faces of the inner motor stator 22 and the outer motor stator 15.

[0040] A support frame 5 is provided radially outside the outer rotor 4, and the support frame 5 can rotate together with the outer rotor 4. Preferably, the support frame 5 is supported to the housing through the outer rotor bearing 2. The support frame 5 has a cylindrical portion and an end surface portion located at one end of the cylindrical portion. The cylindrical portion is fixedly connected to the outer rotor 4, and the cross-sectional portion has an opening for the rotor shaft and other components to pass through.

[0041] Figure 2 A perspective view of a support frame for a motor rotor according to an embodiment of the present invention is shown. Figure 3 A cross-sectional view of a support frame for a motor rotor according to an embodiment of the present invention is shown.

[0042] As an important improvement of the present invention, the detailed structure of the support frame for the motor rotor proposed by the present invention will be combined with Figure 2 and Figure 3For the sake of simplicity, Figures 1 to 3 The right side of the support frame 5 is called the first end 51. Figures 1 to 3 The left side of the support frame 5 is called the second end 52. The present invention proposes the following specific implementations of the support frame.

[0043] As a principle implementation of the support frame, the support frame 5 itself is cylindrical, and the radial thickness or wall thickness W between the first end 51 and the second end 52 is not a fixed value, but changes in a manner of gradually decreasing from the first end 51 to the second end 52, such as Figure 3 In this embodiment, the support frame 5 can be integrally formed by, for example, casting.

[0044] As a specific embodiment of the support frame, the support frame 5 itself is cylindrical, and the radial thickness or wall thickness W between the first end 51 and the second end 52 is not a fixed value, but changes in a manner of gradually decreasing from the first end 51 to the second end 52, such as Figure 3 In this embodiment, the support frame 5 includes a solid structure 53 located radially inward and a mesh structure 54 located outside the solid structure 53. Figure 2 Similarly, the solid structure 53 located radially inward and the mesh structure 54 located outside the solid structure 53 and serving as a reinforcing rib can be integrally formed by, for example, casting.

[0045] As another specific embodiment of the support frame, the support frame 5 itself is cylindrical, and the radial thickness or wall thickness W between the first end 51 and the second end 52 is not a fixed value, but changes in a manner of gradually decreasing from the first end 51 to the second end 52, such as Figure 3 In this embodiment, the support frame 5 only includes a solid structure 53. The solid structure can be integrally formed by, for example, casting.

[0046] As another specific embodiment of the support frame, the support frame 5 itself is cylindrical, and the radial thickness or wall thickness W between the first end 51 and the second end 52 is not a fixed value, but changes in a manner of gradually decreasing from the first end 51 to the second end 52, such as Figure 3 In this embodiment, the support frame 5 only includes a mesh structure 54. Similarly, the mesh structure 54 can be integrally formed by, for example, casting.

[0047] The mesh structure 54 may be formed as follows: Figure 2The rectangular mesh structure formed by mutually perpendicular ribs shown in the figure may also be a diamond mesh structure formed by mutually non-perpendicular ribs. When a rectangular mesh structure formed by mutually perpendicular ribs is used, the mutually perpendicular ribs may have one projection in the axial direction of the support frame coincide with the axis, and the other may be an arc whose plane is perpendicular to the axis; or it may be arranged that the projection of any rib in the axial direction of the support frame does not coincide with the axis.

[0048] The applicant has found through research that for the dual-motor device proposed in the present invention, when the motor rotor rotates, the rotor support frame 5 expands toward the periphery of the circumference due to the centrifugal force from the proximal end to the distal end, thereby generating vibration. Furthermore, if a cantilever support is adopted, that is, the outer rotor bearing 2 is not provided but only the outer rotor output member bearing 13 is provided, then the vibration amplitude of the second end 52 will be greater than that of the first end 51. As the design speed of the motor increases, the requirements for vibration control are getting higher and higher. If a simple equal wall thickness setting is adopted, the vibration of the support frame at the second end 52 cannot be suppressed. Although a bearing support method can also be adopted at the second end 52, this will increase the cost. Secondly, due to the larger radial dimension, the size of the bearing will also be larger. Therefore, the use of this structure with a gradual wall thickness can suppress the vibration at the second end. At the same time, if a mesh structure in the form of reinforcing ribs is adopted, the weight of the bracket can be reduced and the overall structural rigidity can be improved.

[0049] The end surface portion is connected to the outer rotor output member 7 by, for example, threaded fasteners. Figure 4 1 shows a view of an outer rotor output member in a dual motor device according to an embodiment of the present invention viewed in the axial direction. The outer rotor output member has a hollow shaft portion and an end surface parallel to the end surface portion of the support frame 5. On the end surface, holes are preferably evenly distributed in the circumferential direction for threaded fasteners to pass through. In addition, a plurality of openings 71 are provided on the end surface to facilitate operation of the threaded fasteners on both sides to achieve fastening.

[0050] The outer rotor bearing 2 may be a rolling bearing. Preferably, the outer rotor bearing 2 is a segmented rolling bearing, that is, the bearing is not a closed ring, but an arc-shaped segment, which includes rolling elements.

[0051] As a feasible implementation, the support frame 5 and the outer rotor output member 7 may also be integrally formed.

[0052] The second end cover 14 has a plate-shaped end cover body and a cylindrical portion extending axially toward the inside of the housing perpendicular to the end cover body, and the cylindrical portion thus serves as a support portion for the outer rotor output member 7. Optionally, the outer rotor output member 7 is supported on the outer peripheral wall of the cylindrical portion by two outer rotor output member bearings 13. The cylindrical portion is also provided with an annular member 6 for fixedly connecting to the rod 17 of the stator fixing device. Thus, the annular member 6 and the connecting member 16 fix the rod 17 on both sides of the stator respectively. Of course, according to the specific size, motor performance parameters, etc., the outer rotor output member bearing 13 can also be set to one or more. The outer rotor output member bearing 13 can be a ball bearing.

[0053] Since both ends of the stator core can be fixed in the axial direction, there will be no overhang at one end, thus avoiding radial displacement of the stator core during operation, changing the designed air gap value, and thus affecting performance. In addition, both ends of the rotor are supported in the axial direction, so there will be no overhang at one end, thus avoiding strong vibration during high-speed operation and improving NVH performance.

[0054] The annular member 6 and the cylindrical portion can be connected by threads. Thus, when the second end cover 14 is installed, the bolts between the second end cover and the annular member 6 can be tightened by rotation and axial movement under a certain pressure.

[0055] The outer rotor output member 7 can be directly extended out of the housing to facilitate connection with other members to transmit the power of the outer rotor 4. As a preferred embodiment, Figure 1 As shown, the outer rotor output member 7 can be connected to the output shaft 10 through a gear transmission device 9. The gear transmission device 9 can be, for example, a gear that meshes with a gear on the output shaft 10, and can also include a multi-stage gear pair or a planetary gear system.

[0056] exist Figure 1 In the embodiment, the inner rotor shaft 19 extends out of the housing at the second end cover 14 as a connection end to the outside. In this case, both the inner motor and the outer motor are connected to the outside at the second end cover. However, the inner rotor shaft 19 can also extend out of the housing at the first end cover 23 and connect to the outside on this side. Thus, the connection between the inner motor and the outer motor and the outside can be on the same side or on different sides, which increases the flexibility of the interface.

[0057] The inner motor can be operated as a generator or a motor, and the input or output end of the shaft can be designed to be at either end as needed. The outer motor operates as a motor, and the output is output through the speed regulating gear device, which is located at one end of the outer motor axis. For the system,

[0058] Therefore, during operation, the outer motor can output power through the outer rotor output member 7, while the inner motor can output power through the inner rotor shaft 19. This working mode is suitable for scenarios with sufficient power, for example, in which both the inner motor and the outer motor operate as motors to drive mechanical devices with different levels of power requirements.

[0059] When the dual-motor device of the present invention is connected to another prime mover such as an internal combustion engine, in a scenario where the prime mover provides power but there is a lack of electricity, the internal motor can operate as a generator. Part of the electricity can be used by electrical appliances or stored in an energy storage device, and the other part can be provided to the external motor for output power.

[0060] The dual motor device of the present invention can be applied to hybrid vehicles or pure electric vehicles. The internal motor can be used as a generator when the vehicle kinetic energy is recovered.

[0061] When used in a new energy electric drive system, especially a new energy hybrid system, the dual motor device of the present invention is connected with an inverter, a clutch and other devices, and the dual motor device can be set at different positions on the vehicle as needed, and the installation position is more flexible, which can solve the problem that some models cannot provide a whole layout space. The dual motor device, inverter, clutch, etc. can be highly modularized and only rely on electrical interfaces or mechanical interfaces to connect, which can improve the design timeliness of the overall system and shorten the development cycle.

[0062] The dual motor device of the present invention is more compact than two independent motors or dual motors arranged axially in a hybrid drive system, has a higher power density and saves materials. Compared with dual motors used in complex systems (such as hybrid drive systems), it is simple to operate and maintain, and easy to install and disassemble.

[0063] Figure 5 FIG. 2 shows the assembly process of the dual motor device according to an embodiment of the present invention. Figure 5 As shown, first, the inner motor rotor 20 is fixedly connected to the inner rotor shaft 19, and then the rotor bearings 11 are arranged at both ends of the inner rotor shaft 19. According to the direction indicated by the arrow, one end of the inner rotor shaft 19 is then connected to the first end cover 23. Subsequently, the connecting member 16 is fixedly connected to the first end cover 23 through a threaded connecting member, and then the inner motor stator 22 and the outer motor stator 15 are installed on the inner rotor shaft 19, and the inner motor stator 22 and the outer motor stator 15 are fastened to the connecting member 16 through the rod 17. Then, the outer motor rotor 4, the support frame 5 fixedly connected to the outer motor rotor 4, and the outer rotor bearing 2 are arranged radially outside the outer motor stator 15, and the annular member 6 is fixedly connected to the rod 17.

[0064] Subsequently, the outer rotor output member 7, the gear transmission device 9, the output shaft 10, etc. are installed to the second end cover 14, and then the second end cover 14 is installed to the other end of the inner rotor shaft 19, and then the outer rotor output member 7 is fastened to the support frame 5. Finally, the cylindrical body 8 is inserted from the second end cover 14 to the first end cover 23 in the axial direction, and after being in place, the cylindrical body 8 is fixedly connected to the second end cover 14 and the first end cover 23 respectively. In order to realize the above-mentioned assembly method of the shell, the diameter of the first end cover 23 is preferably greater than or equal to the outer diameter of the cylindrical body 8, and the cylindrical body 8 has a radially inwardly extending flange on the side connected to the second end cover 14, and the diameter of the second end cover 14 is slightly smaller than the inner diameter of the cylindrical body 8, but greater than the diameter of the above-mentioned flange, so that the second end cover 14 and the flange have an overlapping portion in the radial direction.

[0065] The present invention has been clearly and completely described with reference to the above exemplary embodiments, and it should be understood by those skilled in the art that various other embodiments can be conceived by modifying the disclosed technical solutions without departing from the spirit and scope of the present invention. These embodiments should be understood to fall within the scope of the present invention determined based on the claims and any equivalent technical solutions thereof.

Claims

1. A support frame for a motor rotor, wherein the rotor is an outer rotor, characterized in that: The support frame (5) comprises a first end (51) and a second end (52), and is composed of a cylindrical portion and an end surface portion located at one end of the cylindrical portion. The support frame is connected to the rotor so that the support frame can rotate together with the rotor, and the wall thickness (W) between the first end and the second end changes in a manner of gradually decreasing from the first end to the second end, and the second end is the power output end of the rotor.

2. The support frame according to claim 1, characterized in that: The support frame is completely composed of a solid structure (53), or completely composed of a mesh structure (54), or composed of a solid structure (53) located radially inside and a mesh structure (54) located outside the solid structure.

3. The support frame according to claim 1 or 2, characterized in that: The support frame is integrally formed by casting.

4. A dual motor device, characterized in that: include: A housing, the housing comprising a first end cover (23), a cylindrical body (8) and a second end cover (14); An inner motor stator (22), an inner motor rotor (20), an outer motor rotor (4), and an outer motor stator (15) are contained in the housing, wherein the outer motor rotor (4), the outer motor stator (15), the inner motor stator (22), and the inner motor rotor (20) are sequentially arranged in the radial direction from the outside to the inside in the order mentioned; According to the support frame (5) according to any one of claims 1 to 3, the support frame is connected to the outer motor rotor (4) so ​​that the support frame can rotate together with the outer motor rotor (4).

5. The dual motor device according to claim 4, characterized in that: Also includes: An inner rotor shaft (19) is arranged radially inside the inner motor rotor (20) and is fixedly connected to the inner motor rotor (20); An outer rotor output member (7), an end surface portion of the support frame being connected to the outer rotor output member (7); The inner motor stator (22) and the outer motor stator (15) are respectively connected to the fixing member on both sides in the axial direction.

6. The dual motor device according to claim 5, characterized in that: The inner motor stator (22) and the outer motor stator (15) are fixed to the first end cover (23) via rods (17) disposed therein; An annular connecting member (16) is also provided, the connecting member is axially located between the first end cover (23) and the inner motor stator (22) and the outer motor stator (15), and the connecting member is fixedly connected to the first end cover; The rods are provided in plurality and are evenly distributed in the circumferential direction, and the rods are fixed to the first end cover (23) by being fixedly connected to the connecting piece.

7. The dual motor device according to claim 5, characterized in that: The second end cover (14) comprises a plate-shaped end cover body and a cylindrical portion extending axially toward the inside of the housing perpendicular to the end cover body, and the outer rotor output member (7) is supported on the cylindrical portion via a bearing; and / or The cylindrical part of the support frame is rotatably supported on the cylindrical body (8) of the housing via an outer rotor bearing (2) which is preferably a segmented rolling bearing.

8. The dual motor device according to claim 5, characterized in that: The outer rotor output member (7) is connected to an output shaft (10) via a gear transmission device (9), and the output shaft (10) passes through the second end cover.

9. The dual motor device according to any one of claims 4 to 8, characterized in that: The inner motor stator (22) and the outer motor stator (15) are fixed to the second end cover (14) via rods (17) disposed therein.

10. The dual motor device according to claim 9, characterized in that: An annular member (6) is also provided, which is arranged on a cylindrical portion of the second end cover (14) extending axially toward the inside of the shell perpendicular to the end cover body, and the rod (17) is fixed to the second end cover (14) by being fixed to the annular member.

Images