Dual-motor device

Abstract

The utility model relates to a dual-motor device, comprising a housing which comprises a first end cover, a cylindrical body and a second end cover; the inner motor stator, the inner motor rotor, the outer motor rotor, the outer motor stator, the outer motor rotor, the outer motor stator, the inner motor stator and the inner motor rotor which are accommodated in the shell are sequentially arranged in the radial direction from outside to inside according to the mentioned sequence; the inner rotor shaft is arranged in the radial direction of the inner motor rotor and is fixedly connected with the inner motor rotor; the outer rotor output component is connected with the outer motor rotor; the inner motor stator and the outer motor stator are respectively connected to the fixing member on both sides in the axial direction. The double-motor device is provided with the inner motor and the outer motor which can operate in different modes according to needs, and compared with two independent motors, the double-motor device is more compact in layout, simple in operation and maintenance and convenient to mount and dismount. In addition, supporting structures are arranged at two ends of the stator and the rotor, so that the motor operates stably.

Description

TECHNICAL FIELD

[0001] The utility model relates to power technology field, concretely relates to a double motor device. BACKGROUND

[0002] Electric machines are commonly used machines, which can operate in motor mode and generator mode. In some occasions, two electric machines can be required. One solution is to use two separate electric machines, and another solution is to integrate two electric machines together. However, two separate electric machines occupy more space, have lower power density than the integrated structure, and consume more materials.

[0003] The integrated solution of double electric machines can be divided into axial arrangement and radial arrangement. For the axial arrangement of double electric machines, the space utilization is not compact enough, resulting in a large axial size of the system. For the radial arrangement of double electric machines, one end of the stator core and one end of the outer rotor are in a suspended state, which causes poor operation stability of the machine set. As the speed increases, the vibration increases, which severely limits the application of the system and can only exist in small and low-speed fields. For the radial arrangement of double electric machines with separate shafts, one end of the shafts of the two electric machines is in a suspended state, which has poor operation stability. For the radial arrangement of double electric machines with support between the inner and outer electric machine shafts, the operation stability of the electric machines is restricted by each other, there is relative movement between the electric machine shafts, the mechanical loss is large, the load requirements of the bearings and shafts are high, the size tolerance between the two shafts needs to be considered when operating at different speeds, the NVH performance is poor, and the design and processing are difficult. SUMMARY

[0004] Therefore, the utility model provides the following technical scheme.

[0005] A double motor device comprises:

[0006] a housing comprising a first end cover, a cylindrical body, and a second end cover;

[0007] an inner motor stator, an inner motor rotor, an outer motor rotor, and an outer motor stator accommodated in the housing, the outer motor rotor, the outer motor stator, the inner motor stator, and the inner motor rotor being arranged in the order mentioned from the outside to the inside in the radial direction;

[0008] an inner rotor shaft arranged radially inside the inner motor rotor and fixedly connected to the inner motor rotor;

[0009] an outer rotor output member connected to the outer motor rotor;

[0010] the inner motor stator and the outer motor stator are connected to the fixed member on both sides in the axial direction.

[0011] According to one example of the present application, the inner motor stator and the outer motor stator are fixed to the first end cover through rods arranged therein.

[0012] According to one example of the present application, a ring-shaped connecting member is further arranged, which is located between the first end cover and the inner motor stator and the outer motor stator in the axial direction, and is fixedly connected to the first end cover.

[0013] The rods are arranged in multiple and uniformly distributed in the circumferential direction, and are fixed to the first end cover through fixed connection with the connecting member.

[0014] According to one example of the present application, a support frame is further arranged, which has a cylindrical portion and an end face portion at one end of the cylindrical portion, the outer motor rotor is arranged inside the cylindrical portion and fixedly connected with the support frame, and the end face portion of the support frame is connected to the outer rotor output member.

[0015] According to one example of the present application, the second end cover has a plate-shaped end cover body and a cylindrical portion extending into the housing in the axial direction perpendicular to the end cover body, and the outer rotor output member is supported on the cylindrical portion through a bearing.

[0016] According to one example of the present application, the cylindrical portion of the support frame is rotatably supported on the cylindrical body of the housing through an outer rotor bearing.

[0017] According to one example of the present application, the outer rotor bearing is a segmented rolling bearing.

[0018] According to one example of the present application, 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.

[0019] According to one example of the present application, the inner motor stator and the outer motor stator are fixed to the second end cover through rods arranged therein.

[0020] According to one example of the present application, a ring-shaped member is further arranged, which is arranged on the cylindrical portion of the second end cover extending into the housing in the axial direction perpendicular to the end cover body, and the rods are fixed to the second end cover through the ring-shaped member.

[0021] As can be seen from the above, the present application provides a double motor device, which has an inner motor and an outer motor that can run in different modes as needed, is more compact compared to two separate motor layouts, and is easy to operate and maintain, and is convenient to install and disassemble. In addition, the stator and the rotor are provided with support structures at both ends, so that the motor runs stably.

[0022] Other features and advantages of the present application will be described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] Exemplary embodiments of the present application will be described with reference to the accompanying drawings, in which:

[0024] Figure 1 A cross-sectional view of a dual motor device according to an embodiment of the present application is shown.

[0025] Figure 2 A view of an outer rotor output member of a dual motor device according to an embodiment of the present application is shown.

[0026] Figure 3 An assembly process of a dual motor device according to an embodiment of the present application is shown.

[0027] All of the drawings are merely schematic and non-limiting, and they are not necessarily drawn to scale, and they are only intended to illustrate the essential features of the present application, other parts being omitted or merely suggested by broken lines. That is, the present application can include other components than those shown in the drawings.

[0028] In the drawings, the same and / or similar technical features are denoted by the same or similar reference numerals. DETAILED DESCRIPTION

[0029] Embodiments of the present application will be described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known process operations have not been described in detail in order not to unnecessarily obscure the present application. In addition, it is to be understood that the present application is not limited in its application to the particular implementation described. Instead, the application is capable of achieving its objects by any combination of the features and elements described below, whether or not such combinations are specifically noted in the following description. Aspects, features, embodiments and advantages of the present application will be described in the following description with reference to the drawings.

[0030] In the following description, explanations using terms such as "upper", "lower", "inner", "outer", "radial", "axial", etc. with respect to orientation can be used, unless explicitly stated, only for the convenience of description, and not to form any limitation on the technical solutions of the present application. In addition, in the following, 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 respective elements, and not to limit the nature, sequence, order or number of the elements.

[0031] Figure 1 A cross-sectional view of a dual motor device according to an embodiment of the present application is shown. ByFigure 1 It can be seen that the double-motor device comprises two motors, which form a double-motor device arranged in a radial direction, and the stators and rotors of the two motors at least partially overlap in an 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, the two motors are also referred to as an outer motor and an inner motor according to their positional relationship. The outer motor comprises an outer motor stator 15 and an outer motor rotor 4, and has a first air gap 3 between the outer motor stator 15 and the outer motor rotor 4. The outer motor stator 15 comprises a stator core and an outer motor stator winding 1 arranged in the stator core. The inner motor comprises an inner motor stator 22 and an inner motor rotor 20, and has a second air gap 21 between the inner motor stator 22 and the inner motor rotor 20. The inner motor stator 22 comprises a stator core and an inner motor stator winding 18 arranged in the stator core. In the order from the outside to the inside in the radial direction, 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 order mentioned. Preferably, the outer motor rotor 4, the outer motor stator 15, the inner motor stator 22 and the inner motor rotor 20 substantially coincide in the axial direction.

[0032] The inner motor stator 22 is radially adjacent to the outer motor stator 15. 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 by a wedge-shaped structure.

[0033] The double-motor device further comprises a housing. Preferably, the housing comprises 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 threaded members. 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 an inner rotor shaft 19, and the inner rotor shaft 19 is supported by a rotor bearing 11 in the respective openings of the first end cover 23 and the second end cover 14, respectively. As a specific embodiment, the first end cover 23 has a first bearing support portion extending into the interior of the housing in the axial direction perpendicular to the body of the end cover, and the inner rotor shaft 19 is supported by a 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 a connecting piece 16 to be mentioned below.

[0034] 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 comprises a rod 17 which passes through the inner motor stator 22 and the outer motor stator 15 in the axial direction, and a connecting piece 16 which fixes the rod 17 to a fixed member, such as the first end cover 23. Specifically, the rod 17 can be a screw rod, and a plurality of rods 17 can be arranged in the circumferential direction, especially uniformly. The connecting piece 16 can be an annular plate-shaped member which is fixed to the fixed member by a threaded connecting piece or the like, and the rod 17 can be fixed to the connecting piece 16 by a threaded fastener. Although the rod 17 can also be directly connected to the fixed member, since there is a certain distance from the end of the stator to the fixed member, such as the motor housing, direct connection will result in a relatively long length of the rod 17, so that the axial length of the rod 17 is reduced by providing the annular connecting piece 16, which can enhance the rigidity of the core and reduce vibration during operation. Preferably, the distance from the connecting piece 16 to the fixed member is substantially equal to the distance from the end surface of the inner motor stator 22 and the outer motor stator 15.

[0035] A support frame 5 is arranged radially outward of 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 by the outer rotor bearing 2. The support frame 5 has a cylindrical portion and an end surface portion at one end of the cylindrical portion. The cylindrical portion is fixedly connected to the outer rotor 4, and the end surface portion has an opening for passing through components such as a rotor shaft.

[0036] The end surface portion is connected to the outer rotor output member 7 by, for example, a threaded fastener or the like. Figure 2 A view of the outer rotor output member in the double motor device according to an embodiment of the present application is shown. 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 which are preferably uniformly distributed in the circumferential direction are arranged for the threaded fastener to pass through. In addition, a plurality of openings 71 are provided on the end surface to facilitate operation of the threaded fastener on both sides, thereby achieving fastening.

[0037] The outer rotor bearing 2 can be a rolling bearing. Preferably, the outer rotor bearing 2 is a segmented rolling bearing, i.e. the bearing is not a closed annular ring, but a circular arc segment which includes rolling bodies.

[0038] As a feasible embodiment, the support frame 5 and the outer rotor output member 7 can be integrally formed.

[0039] The second end cover 14 has a plate-shaped end cover body and a cylindrical portion extending axially into the housing interior perpendicularly to the end cover body, which serves as a support for the outer rotor output member 7. Alternatively, the outer rotor output member 7 is supported by two outer rotor output member bearings 13 on the outer circumferential wall of the cylindrical portion. The cylindrical portion is also provided with an annular member 6 for fixed connection with the shaft 17 of the stator fixing device. Thus, the annular member 6 and the connecting member 16 fix the shaft 17 on both sides of the stator. Of course, depending on the specific dimensions, motor performance parameters, etc., the outer rotor output member bearings 13 can also be provided as one or more. The outer rotor output member bearings 13 can be ball bearings.

[0040] Since the stator core is fixed at both ends in the axial direction, it is not suspended at one end, thereby avoiding radial displacement of the stator core during operation, changing the design air gap value and thus affecting performance. In addition, the rotor is supported at both ends in the axial direction, and is not suspended at one end, thereby avoiding strong vibration during high-speed operation and improving NVH performance.

[0041] The annular member 6 and the cylindrical portion can be connected by threads. Thus, during installation of the second end cover 14, the bolt tightening between the second end cover and the annular member 6 can be achieved by rotation and axial movement under a certain pressure.

[0042] The outer rotor output member 7 can directly extend out of the housing to facilitate connection with other components to transmit the power of the outer rotor 4. As a preferred embodiment, as shown in Figure 1 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 meshing with a gear on the output shaft 10, or can include a multi-stage gear pair or a planetary gear train.

[0043] In Figure 1 , the inner rotor shaft 19 extends out of the housing at the second end cover 14 as a connection end to the outside. At this time, 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 be connected to the outside at this side. Thus, the connection of the inner motor and the outer motor to the outside can be on the same side or on different sides, which increases the flexibility of the interface.

[0044] The inner motor can operate as a generator or an electric motor, and the input end or the output end of the shaft can be designed as needed at either end. The outer motor operates as an electric motor and is output through a speed regulation gear device at one end of the outer motor in the axial direction. For the system,

[0045] Thus, in 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 mode of operation is suitable, for example, in scenarios where there is sufficient power, and both the inner motor and the outer motor are operated as electric motors to drive a mechanical device with different levels of power demand.

[0046] When the dual motor device of the present application is connected to other prime movers, such as an internal combustion engine, in scenarios where the prime mover provides power but lacks electricity, the inner motor can be operated as a generator, and a portion of the electricity can be used by electrical devices or stored in an energy storage device, and another portion can be provided to the outer motor for power output.

[0047] The dual motor device of the present application can be applied to hybrid electric vehicles or pure electric vehicles. The inner motor can be used as a generator during vehicle kinetic energy recovery.

[0048] When used in new energy electric drive systems, especially new energy hybrid systems, the dual motor device of the present application is connected to inverters, clutches and other devices, and can be placed at different positions on the vehicle as needed, with more flexible installation positions, which can solve the problem of some vehicle models not providing a whole layout space. The dual motor device and the inverters, clutches and other devices can be highly modularized, connected only through electrical or mechanical interfaces, which can improve the design efficiency of the total system and shorten the development cycle.

[0049] The dual motor device of the present application is more compact than two independent motors or a dual motor arranged axially in a hybrid drive system, has higher power density, and saves materials. Compared with a dual motor applied in a complex system (such as a hybrid drive system), it is simple to operate and maintain, and easy to install and disassemble.

[0050] Figure 3 The assembly process of the dual motor device according to an embodiment of the present application is shown. As shown in Figure 3 The inner motor rotor 20 is first fixedly connected to the inner rotor shaft 19, and then rotor shaft bearings 11 are arranged at both ends of the inner rotor shaft 19. Then, the inner rotor shaft 19 is connected to the first end cover 23 in the direction indicated by the arrow. Subsequently, the connecting member 16 is fixedly connected to the first end cover 23 through a threaded connection, and 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.

[0051] Subsequently, the outer rotor output member 7, the gear transmission 9, the output shaft 10 and the like are mounted to the second end cover 14, then the second end cover 14 is mounted to the other end of the inner rotor shaft 19, then the outer rotor output member 7 is fastened to the support frame 5. Finally, the cylindrical body 8 is axially sleeved from the second end cover 14 to the first end cover 23, and after being in place, the cylindrical body 8 is fixedly connected with the second end cover 14 and the first end cover 23 respectively. In order to realize the above-mentioned assembly mode 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 flange extending radially inward on the side connected with the second end cover 14, the diameter of the second end cover 14 is slightly smaller than the inner diameter of the cylindrical body 8, and greater than the diameter of the flange, so that the second end cover 14 and the flange have a radial overlap.

[0052] The utility model has been clearly and completely described with reference to the above-mentioned exemplary embodiments, and those skilled in the art should understand that various other embodiments can be conceived through modification of the disclosed technical solutions without departing from the spirit and scope of the utility model. These embodiments should be understood to fall within the scope of the utility model as defined by the claims and any equivalent technical solutions thereof.

Claims

1. A dual motor arrangement, characterized by, Comprise: a 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), an outer motor stator (15) accommodated in the housing, the outer motor rotor (4), the outer motor stator (15), the inner motor stator (22) and the inner motor rotor (20) being arranged in the mentioned order from outside to inside in the radial direction; an inner rotor shaft (19) arranged radially inside the inner motor rotor (20) and fixedly connected with the inner motor rotor (20); an outer rotor output member (7) connected with the outer motor rotor (4); the inner motor stator (22) and the outer motor stator (15) being connected to fixed members on both sides in the axial direction.

2. The dual motor device according to claim 1, characterized in that the inner motor stator (22) and the outer motor stator (15) are fixed to the first end cover (23) through rods (17) arranged therein.

3. The dual motor device according to claim 2, characterized in that a ring-shaped connecting member (16) is further arranged, which is located between the first end cover (23) and the inner motor stator (22) and the outer motor stator (15) in the axial direction, and is fixedly connected to the first end cover; the rods are arranged in multiple and are uniformly distributed in the circumferential direction, and are fixed to the first end cover (23) through fixed connection with the connecting member.

4. The dual motor device according to any one of claims 1-3, characterized in that a support frame (5) is further arranged, which has a cylindrical portion and an end face portion at one end of the cylindrical portion, the outer motor rotor (4) is arranged inside the cylindrical portion and is fixedly connected with the support frame, and the end face portion of the support frame is connected to the outer rotor output member (7).

5. The dual motor device according to claim 4, characterized in that the second end cover (14) has a plate-shaped end cover body and a cylindrical portion extending axially into the interior of the housing perpendicularly to the end cover body, and the outer rotor output member (7) is supported on the cylindrical portion through a bearing.

6. The dual motor device according to claim 4, characterized in that the cylindrical portion of the support frame is rotationally supported on the cylindrical body (8) of the housing through an outer rotor bearing (2).

7. The dual motor device according to claim 6, characterized in that the outer rotor bearing (2) is a segmented rolling bearing.

8. The dual motor device according to claim 4, characterized in that the outer rotor output member (7) is connected to an output shaft (10) through 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 1-3, characterized in that the inner motor stator (22) and the outer motor stator (15) are fixed to the second end cover (14) through rods (17) arranged therein.

10. The dual motor device according to claim 9, characterized in that There is also provided an annular member (6) which is provided on a cylindrical portion of the second end cap (14) which extends axially into the housing interior perpendicular to the end cap body, the rod (17) being fixed to the second end cap (14) by being fixed to the annular member.

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