Drive device

Abstract

The utility model discloses a driving device. The driving device comprises a first motor, a second motor and a rotary transformer assembly. The first motor comprises a first stator and a first rotor, and a first rotating shaft is arranged on the first rotor; the second motor comprises a second stator and a second rotor, a second rotating shaft is arranged on the second rotor, the second rotating shaft is connected with the first rotating shaft and rotates synchronously with the first rotating shaft, a through hole is formed in the second rotating shaft in the axis direction of the second rotating shaft, a rotary variable shaft is arranged in the through hole, and the rotary variable shaft is connected with the first rotating shaft and rotates synchronously with the first rotating shaft; the rotary transformer assembly comprises a first rotary transformer and a second rotary transformer, the rotary transformer shaft is sleeved with the first rotary transformer, and the second rotary shaft is sleeved with the second rotary transformer. The problem that when two rotary transformers are placed on the rear end cover in the prior art, one rotary transformer cannot accurately monitor information such as the position, the direction and the speed of the rotating shaft far away from the rotary transformer can be solved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a driving device. Background Art

[0002] Permanent magnet motors have the characteristics of high power, high torque, and large output current. However, when the output current of the motor is greater than 1000A, its controller cannot achieve effective control. To solve this problem, the prior art usually adopts two permanent magnet motors in series to reduce the output current of a single motor, and matches it with its controller to control the operation of the motor.

[0003] At present, when two permanent magnet motors are connected in series, they share the front cover, rear cover, stator assembly and casing, and two rotary transformers are used to control the position, direction, speed and other information of the two motors. If the two rotary transformers are respectively set at the front cover and the rear cover, since the front cover is close to the output end and the space is limited, it is easy to increase the difficulty and cost of processing the front cover, and there will be problems such as cumbersome installation of the rotary transformer; if both rotary transformers are set at the rear cover, since the two shafts of the dual motors are splined, the torque is transmitted by clearance fit between the matching splines. At this time, the rotary transformer cannot accurately monitor the position, direction, speed and other information of the shaft far away from the rotary transformer. Utility Model Content

[0004] The main purpose of the present application is to provide a driving device to solve the problem in the prior art that when two rotary transformers are placed on the rear end cover, one of the rotary transformers cannot accurately monitor the position, direction, speed and other information of the rotating shaft away from the rotary transformer.

[0005] According to one aspect of the present application, a driving device is provided, comprising:

[0006] A first motor, the first motor comprising a first stator and a first rotor, and the first rotor is provided with a first rotating shaft;

[0007] A second motor, the second motor comprises a second stator and a second rotor, the second rotor is provided with a second rotating shaft, the second rotating shaft is connected to the first rotating shaft and rotates synchronously with the first rotating shaft, and along the axial direction of the second rotating shaft, a through hole is provided on the second rotating shaft, a rotary shaft is provided in the through hole, the rotary shaft is connected to the first rotating shaft and rotates synchronously with the first rotating shaft;

[0008] The resolver assembly is arranged at an end of the second motor away from the first motor, and the resolver assembly includes a first resolver and a second resolver, the first resolver is sleeved on the resolver shaft, and the second resolver is sleeved on the second rotating shaft.

[0009] Furthermore, the driving device also includes a housing component, the housing component has a containing cavity, and along a first direction, the first motor and the second motor are sequentially arranged in the containing cavity.

[0010] Furthermore, the housing assembly comprises:

[0011] A shell, wherein the shell has the accommodating cavity, and the first stator and the second stator are both fixedly connected to the inner wall surface of the shell;

[0012] A first end cover, wherein the first end cover is fixedly connected to the first end of the housing, and an end of the first rotating shaft away from the second rotating shaft is connected to the first end cover;

[0013] A second end cover is fixedly connected to a second end of the shell opposite to the first end, and one end of the second rotating shaft away from the first rotating shaft and one end of the rotating shaft away from the first rotating shaft are connected to the second end cover.

[0014] Further, an annular convex portion is provided on a side of the second end cover away from the second rotating shaft, a resolver end cover is provided on the annular convex portion, the resolver end cover has an installation cavity, and the first resolver and the second resolver are both arranged in the installation cavity.

[0015] Furthermore, the housing assembly further comprises:

[0016] A support member is disposed in the accommodating cavity and between the first motor and the second motor. A mounting hole is disposed on the support member. Both the first rotating shaft and the second rotating shaft are rotatably disposed in the mounting hole.

[0017] Furthermore, the first rotating shaft and the second rotating shaft are connected by a key.

[0018] Furthermore, one of the first rotating shaft and the rotational shaft is provided with a threaded section, and the other of the first rotating shaft and the rotational shaft is provided with a threaded hole matched with the threaded section.

[0019] Furthermore, the inner diameter of the through hole is larger than the outer diameter of the resolver shaft.

[0020] Furthermore, a linear bearing is sleeved on the resolver shaft, and the linear bearing is arranged at one end of the resolver shaft away from the first rotating shaft and is located in the through hole.

[0021] Further, a protruding section is provided at one end of the rotary transformer shaft away from the first rotating shaft, the protruding section protrudes from the end of the second rotating shaft away from the first rotating shaft, and the first rotary transformer is sleeved on the protruding section.

[0022] Compared with the installation structure of two rotating transformers when dual motors are connected in series in the prior art, the second rotating shaft of the present application adopts a hollow shaft structure, and a rotating transformer shaft is added inside the hollow shaft. When the first rotating transformer is installed on the rotating transformer shaft and the second rotating transformer is installed on the second rotating shaft, since the rotating transformer shaft is connected to the first rotating shaft and rotates synchronously with the first rotating shaft, the first rotating transformer can accurately monitor the position, direction, speed and other information of the first rotating shaft, and the second rotating transformer can accurately monitor the position, direction, speed and other information of the second rotating shaft. Moreover, since the first rotating transformer and the second rotating transformer are both located at the non-output end of the driving device, it can not only reduce the processing difficulty and processing cost of the driving device, but also effectively avoid the risk of motor failure caused by the rotating transformer being installed at the output end. At the same time, it is conducive to the disassembly and inspection of the driving device, and reduces the disassembly and maintenance cost of the driving device to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 A schematic diagram of the structure of the driving device disclosed in the embodiment of the present application;

[0025] Figure 2 The attached embodiment disclosed in this application Figure 1 A magnified schematic diagram of the middle A area;

[0026] Figure 3 It is a cross-sectional view of the first rotating shaft, the second rotating shaft, the revolver shaft and the revolver assembly disclosed in the embodiment of the present application.

[0027] The above drawings include the following reference numerals:

[0028] 10. First motor; 11. First stator; 12. First rotor; 13. First rotating shaft; 20. Second motor; 21. Second stator; 22. Second rotor; 23. Second rotating shaft; 231. Through hole; 30. Resolver shaft; 301. Protruding section; 40. Resolver assembly; 41. First rotating transformer; 42. Second rotating transformer; 50. Housing assembly; 501. Accommodating cavity; 51. Housing; 52. First end cover; 53. Second end cover; 531. Annular convex portion; 54. Support member; 60. Resolver end cover; 70. Linear bearing. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] As mentioned in the background technology, when two existing permanent magnet motors are connected in series, they will share the front cover, rear cover, stator assembly and housing, and two rotary transformers are used to control the position, direction, speed and other information of the two motors. If the two rotary transformers are respectively set at the front cover and the rear cover, since the front cover is close to the output end, the space here is limited, which easily leads to increased difficulty in processing the front cover, increased processing costs, and cumbersome installation of the rotary transformer; if both rotary transformers are set at the rear cover, one of the rotary transformers cannot accurately monitor the position, direction, speed and other information of the rotating shaft away from the rotary transformer. Therefore, in order to reduce the processing difficulty and processing cost of the motor, and to accurately monitor the position, direction, speed and other information of the rotating shaft away from the rotary transformer, the inventor of the present application has designed a new type of drive device, and the drive device of the present application will be described in detail below.

[0033] See also Figures 1 to 3 As shown, the present application provides a driving device, including a first motor 10 , a second motor 20 and a resolver assembly 40 .

[0034] Among them, the first motor 10 includes a first stator 11 and a first rotor 12, and a first rotating shaft 13 is arranged on the first rotor 12; the second motor 20 includes a second stator 21 and a second rotor 22, and a second rotating shaft 23 is arranged on the second rotor 22, the second rotating shaft 23 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13, and along the axial direction of the second rotating shaft 23, a through hole 231 is arranged on the second rotating shaft 23, and a rotary shaft 30 is arranged in the through hole 231, and the rotary shaft 30 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13; the rotary transformer assembly 40 is arranged at one end of the second motor 20 away from the first motor 10, and the rotary transformer assembly 40 includes a first rotary transformer 41 and a second rotary transformer 42, the first rotary transformer 41 is sleeved on the rotary transformer shaft 30, and the second rotary transformer 42 is sleeved on the second rotating shaft 23.

[0035] Specifically, in this embodiment, the end of the first rotating shaft 13 away from the second rotating shaft 23 is the output end of the driving device, the end of the second rotating shaft 23 away from the first rotating shaft 13 is the non-output end of the driving device, and the end of the rotating shaft 30 away from the first rotating shaft 13 is the non-output end of the driving device.

[0036] In this embodiment, when the driving device is actually processed, the first rotating shaft 13 of the first motor 10 can be connected to the second rotating shaft 23 of the second motor 20 to realize the series connection of the first motor 10 and the second motor 20. At this time, the first rotating shaft 13 and the second rotating shaft 23 rotate synchronously. In this way, when the output current of the motor is too large, the first motor 10 and the second motor 20 connected in series can reduce the output current when a single motor is used, and can be matched with its existing controller to control the normal operation of the motor; then a through hole 231 is set on the second rotating shaft 23 to form a hollow shaft structure of the second rotating shaft 23, and a rotary shaft 30 is set in the through hole 231, and the rotary shaft 30 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13, and then the first rotary transformer 41 is sleeved on the rotary shaft 30, The second rotary transformer 42 is sleeved on the second rotating shaft 23, wherein the first rotary transformer 41 accurately monitors the position and other information of the first rotating shaft 13, and the second rotary transformer 42 accurately monitors the position and other information of the second rotating shaft 23. At this time, the first rotary transformer 41 and the second rotary transformer 42 are installed at the same end and are located at the non-output end. In this way, it is not only possible to reduce the processing difficulty and processing cost of the drive device, but also to effectively avoid the failure risk caused by the complex working environment such as high temperature, vibration, leakage, etc. when the rotary transformer of a motor is installed at the output end in the prior art. At the same time, the first rotary transformer 41 and the second rotary transformer 42 located at the same end only need to disassemble the end cover of one end for maintenance during disassembly and inspection, which greatly reduces the disassembly and maintenance cost of the drive device. In addition, since the first rotary transformer 41 is sleeved on the rotary shaft 30, and the rotary shaft 30 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13, the existence of the rotary shaft 30 can enable the first rotary transformer 41 to accurately monitor the position and other information of the first rotating shaft 13.

[0037] That is to say, compared with the installation structure of two rotary transformers when dual motors are connected in series in the prior art, the second rotating shaft 23 of the present application adopts a hollow shaft structure, and a rotary transformer shaft 30 is added inside the hollow shaft. When the first rotary transformer 41 is installed on the rotary transformer shaft 30 and the second rotary transformer 42 is installed on the second rotating shaft 23, since the rotary transformer shaft 30 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13, the first rotary transformer 41 can accurately monitor the position, direction, speed and other information of the first rotating shaft 13, and the second rotary transformer 42 can accurately monitor the position, direction, speed and other information of the second rotating shaft 23. Moreover, since the first rotary transformer 41 and the second rotary transformer 42 are both located at the non-output end of the driving device, it can not only reduce the processing difficulty and processing cost of the driving device, but also effectively avoid the risk of motor failure caused by the rotary transformer being installed at the output end. At the same time, it is conducive to the disassembly and inspection of the driving device, and reduces the disassembly and maintenance cost of the driving device to a certain extent.

[0038] Further, see Figure 1 As shown, the driving device in this embodiment further includes a housing component 50, the housing component 50 has a receiving cavity 501, and along the first direction (attached Figure 1 The first motor 10 and the second motor 20 are sequentially arranged in the accommodating cavity 501 in the direction indicated by the letter X in the figure. That is to say, the first motor 10 and the second motor 20 in the present application share the same housing assembly 50, which increases the system integration of the drive device, improves the space utilization of the drive device and the overall efficiency of the drive device output, and effectively reduces the processing cost and volume of the drive device.

[0039] Further, see Figure 1 As shown, the housing assembly 50 in this embodiment includes a shell 51 , a first end cover 52 and a second end cover 53 .

[0040] Among them, the shell 51 has a accommodating cavity 501, and the first stator 11 and the second stator 21 are fixedly connected to the inner wall surface of the shell 51; the first end cover 52 is fixedly connected to the first end of the shell 51, and the end of the first rotating shaft 13 away from the second rotating shaft 23 is connected to the first end cover 52; the second end cover 53 is fixedly connected to the second end of the shell 51 opposite to the first end, and the end of the second rotating shaft 23 away from the first rotating shaft 13 and the end of the variable shaft 30 away from the first rotating shaft 13 are connected to the second end cover 53.

[0041] Specifically, the first end cover 52 and the second end cover 53 in this embodiment enclose the housing 51 to form a housing chamber 501 for the installation of the first motor 10 and the second motor 20. The first end cover 52 in this embodiment is located at the output end of the driving device, and the second end cover 53 is located at the non-output end of the driving device, which can protect the first motor 10 and the second motor 20 located in the housing chamber 501, prevent external debris from entering the housing chamber 501, and extend the service life of the driving device to a certain extent. At the same time, the first end cover 52 also provides support and fixing for the first rotor 12, the first stator 11 and the first rotating shaft 13, and the second end cover 53 also provides support and fixing for the second rotor 22, the second stator 21, the second rotating shaft 23 and the rotating shaft 30. In addition, the presence of the first end cover 52 and the second end cover 53 helps the heat dissipation of the driving device, effectively ensures the stability of the internal temperature of the driving device, and prevents the driving device from failing due to overheating.

[0042] Specifically, in this embodiment, the first stator 11 and the inner wall surface of the housing 51 , as well as the second stator 21 and the inner wall surface of the housing 51 are fixedly connected by interference fit.

[0043] Further, see Figure 2As shown, in this embodiment, the second end cover 53 is provided with an annular convex portion 531 on one side away from the second rotating shaft 23, and a rotary end cover 60 is provided on the annular convex portion 531. The rotary end cover 60 has an installation cavity, and the first rotary transformer 41 and the second rotary transformer 42 are both arranged in the installation cavity. In this way, it is convenient to arrange the first rotary transformer 41 and the second rotary transformer 42.

[0044] Further, see Figure 1 As shown, the housing assembly 50 in this embodiment further includes a support member 54, which is disposed in the accommodating cavity 501 and between the first motor 10 and the second motor 20. The support member 54 is provided with a mounting hole, and the first rotating shaft 13 and the second rotating shaft 23 are both rotatably disposed in the mounting hole. The support member 54 in this embodiment is located at the connection between the first rotating shaft 13 and the second rotating shaft 23. In this way, the support member 54 can not only provide support and fixation for the first rotating shaft 13 and the second rotating shaft 23, but also limit the assembly position of the first motor 10 and the second motor 20.

[0045] Furthermore, the first rotating shaft 13 and the second rotating shaft 23 in this embodiment are connected by a key. It can be understood that the first rotating shaft 13 and the second rotating shaft 23 in this embodiment can be connected by a flat key, a semicircular key, a pin or a spline. Among them, the flat key connection has the advantages of simple structure and convenient assembly and disassembly; the semicircular key connection has the advantages of good processability and convenient assembly; the pin connection has the advantages of simple structure, high connection strength and disassembly; the spline connection has the advantages of uniform force at the connection, can withstand a large load, and has good guidance.

[0046] Specifically, the first rotating shaft 13 and the second rotating shaft 23 in this embodiment are preferably connected by splines, and the paired splines of the first rotating shaft 13 and the second rotating shaft 23 are used to transmit torque by clearance fit. Among them, the first rotating shaft 13 is an external spline, and the second rotating shaft 23 is an internal spline. In this arrangement, since the spline is multi-tooth bearing, the bearing capacity of the first rotating shaft 13 and the second rotating shaft 23 can be improved, and the transmission torque of the first rotating shaft 13 and the second rotating shaft 23 is increased, and the coaxiality accuracy of the first rotating shaft 13 and the second rotating shaft 23 is improved to a certain extent.

[0047] Furthermore, in this embodiment, a threaded section is provided on one of the first rotating shaft 13 and the revolving shaft 30, and a threaded hole matching the threaded section is provided on the other of the two. That is to say, the threaded section can be provided on the first rotating shaft 13 or the revolving shaft 30, and the threaded hole can be provided on the first rotating shaft 13 or the revolving shaft 30. Specifically, when the first rotating shaft 13 is provided with a threaded section, the revolving shaft 30 is provided with a threaded hole; when the first rotating shaft 13 is provided with a threaded hole, the revolving shaft 30 is provided with a threaded section, and the arrangement of the threaded section and the threaded hole is not specifically limited in this application. With such an arrangement, the structure is simple, the connection reliability between the first rotating shaft 13 and the revolving shaft 30 is effectively guaranteed, and the disassembly and assembly of the first rotating shaft 13 and the revolving shaft 30 is convenient.

[0048] Furthermore, the inner diameter of the through hole 231 in this embodiment is larger than the outer diameter of the resolver shaft 30. This arrangement can provide a rotation space for the resolver shaft 30, ensuring that the resolver shaft 30 can rotate in the through hole 231, thereby ensuring the normal operation of the drive device.

[0049] Further, see Figures 2 to 3 As shown, a linear bearing 70 is sleeved on the rotary shaft 30 in this embodiment, and the linear bearing 70 is arranged at one end of the rotary shaft 30 away from the first rotating shaft 13 and is located in the through hole 231. The linear bearing 70 has the advantages of low friction, reliable structure, strong bearing capacity, high long-distance running precision, and long service life, and can support the rotary shaft 30. In addition, since the first rotating shaft 13 and the rotary shaft 30 are connected by a thread, the first rotating shaft 13 and the rotary shaft 30 are prone to loosening and slipping during the high-speed operation of the driving device. When the linear bearing 70 is sleeved on the end of the rotary shaft 30 away from the first rotating shaft 13, the normal rotation of the rotary shaft 30 can be guaranteed, the stress concentration between the threaded section and the threaded hole is reduced, the preload force between the first rotating shaft 13 and the rotary shaft 30 is increased, and relative slippage between the first rotating shaft 13 and the rotary shaft 30 is prevented.

[0050] Further, see Figure 2 As shown, the end of the rotary shaft 30 in this embodiment away from the first rotating shaft 13 is provided with a protruding section 301, the protruding section 301 protrudes from the end of the second rotating shaft 23 away from the first rotating shaft 13, and the first rotary transformer 41 is sleeved on the protruding section 301. Such a configuration facilitates the installation of the first rotary transformer 41, and the first rotary transformer 41 and the second rotary transformer 42 can be located at the same end, reducing the processing difficulty and processing cost of the drive device, facilitating disassembly and installation, and reducing the disassembly and maintenance cost to a certain extent.

[0051] Specifically, the assembly steps of the drive device of the present application are as follows:

[0052] First, the support member 54 is welded into the accommodating cavity 501 of the shell 51, and the first stator 11 and the second stator 21 are shrink-fitted onto the inner wall surface of the shell 51 (that is, the first stator 11 and the second stator 21 are fixedly connected to the shell 51 by interference fit); then the first rotor 12 is sleeved on the first rotating shaft 13 and assembled on the first end cover 52, and then installed into the accommodating cavity 501 of the shell 51, and the first end cover 52 and the shell 51 are connected by fasteners; the second rotor 22 is sleeved on the second end cover 52; The second rotating shaft 23 is mounted on the rotating shaft 23, and the internal spline of the second rotating shaft 23 cooperates with the external spline of the first rotating shaft 13, so that the second rotating shaft 23 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13, and then the rotary shaft 30 is installed in the through hole 231 of the second rotating shaft 23, and the rotary shaft 30 is connected to the first rotating shaft 13 and rotates synchronously with the first rotating shaft 13; then the second end cover 53 is assembled with the second rotating shaft 23 and the rotary shaft 30, and the second end cover 53 is connected to the housing 51 by fasteners. In this way, the entire drive device is partially assembled, and the assembly process of the first rotary transformer 41 and the second rotary transformer 42 is carried out.

[0053] The first rotary transformer 41 is installed on the end of the rotary transformer shaft 30 away from the first rotating shaft 13 and is located on the protruding section 301 of the rotary transformer shaft 30, and the first rotary transformer 41 is installed on the rotary transformer end cover 60; the second rotary transformer 42 is installed on the second rotating shaft 23, and the second rotary transformer 42 is installed on the rotary transformer end cover 60; the rotary transformer end cover 60 with the first rotary transformer 41 and the second rotary transformer 42 installed is installed on the annular convex portion 531 of the second end cover 53, and is fastened by fasteners to complete the entire assembly.

[0054] Optionally, the fasteners in this embodiment include parts such as bolts, nuts, screws, and screws for achieving fixed connection.

[0055] In summary, the driving device of the present application has the following advantages:

[0056] (1) In the present application, the first rotary transformer and the second rotary transformer are installed at the same end. When disassembling and inspecting the drive device, only the second end cover needs to be removed for inspection, which reduces the disassembly and maintenance cost of the drive device to a certain extent;

[0057] (2) The present application installs the first rotary transformer and the second rotary transformer at the non-output end, which simplifies the process flow, reduces the production and processing costs, and effectively avoids the failure risk caused by complex working environments such as high temperature, vibration, leakage, etc. in the prior art because a rotary transformer of a motor is installed at the output end;

[0058] (3) The second rotating shaft in the present application is a hollow shaft structure, and a rotary shaft is added inside the hollow shaft, and the rotary shaft is connected to the first rotating shaft and rotates synchronously. When the first rotary transformer is installed on the rotary shaft, the first rotary transformer can accurately monitor the position, direction, speed and other information of the first rotating shaft. When the second rotary transformer is installed on the second rotating shaft, the second rotary transformer can accurately monitor the position, direction, speed and other information of the second rotating shaft.

[0059] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0060] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0061] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A driving device, characterized in that: include: A first motor (10), the first motor (10) comprising a first stator (11) and a first rotor (12), the first rotor (12) being provided with a first rotating shaft (13); a second motor (20), the second motor (20) comprising a second stator (21) and a second rotor (22), the second rotor (22) being provided with a second rotating shaft (23), the second rotating shaft (23) being connected to the first rotating shaft (13) and rotating synchronously with the first rotating shaft (13), and a through hole (231) being provided on the second rotating shaft (23) along the axial direction of the second rotating shaft (23), a rotating shaft (30) being provided in the through hole (231), the rotating shaft (30) being connected to the first rotating shaft (13) and rotating synchronously with the first rotating shaft (13); A resolver assembly (40), wherein the resolver assembly (40) is arranged at an end of the second motor (20) away from the first motor (10), and the resolver assembly (40) comprises a first resolver (41) and a second resolver (42), wherein the first resolver (41) is sleeved on the resolver shaft (30), and the second resolver (42) is sleeved on the second rotating shaft (23).

2. The driving device according to claim 1, characterized in that: The driving device further comprises a housing component (50), the housing component (50) having a receiving cavity (501), and the first motor (10) and the second motor (20) are sequentially arranged in the receiving cavity (501) along a first direction.

3. The driving device according to claim 2, characterized in that: The housing assembly (50) comprises: A shell (51), the shell (51) having the accommodating cavity (501), the first stator (11) and the second stator (21) both being fixedly connected to the inner wall surface of the shell (51); a first end cover (52), wherein the first end cover (52) is fixedly connected to a first end of the housing (51), and an end of the first rotating shaft (13) away from the second rotating shaft (23) is connected to the first end cover (52); A second end cover (53), the second end cover (53) is fixedly connected to a second end of the housing (51) opposite to the first end, and one end of the second rotating shaft (23) away from the first rotating shaft (13) and one end of the rotating shaft (30) away from the first rotating shaft (13) are connected to the second end cover (53).

4. The driving device according to claim 3, characterized in that: An annular convex portion (531) is provided on a side of the second end cover (53) away from the second rotating shaft (23), and a rotary transformer end cover (60) is provided on the annular convex portion (531). The rotary transformer end cover (60) has an installation cavity, and the first rotary transformer (41) and the second rotary transformer (42) are both arranged in the installation cavity.

5. The driving device according to claim 2, characterized in that: The housing assembly (50) further comprises: A support member (54), the support member (54) is arranged in the accommodating cavity (501) and is located between the first motor (10) and the second motor (20), and a mounting hole is provided on the support member (54), and the first rotating shaft (13) and the second rotating shaft (23) are both rotatably arranged in the mounting hole.

6. The driving device according to claim 1, characterized in that: The first rotating shaft (13) and the second rotating shaft (23) are connected via a key.

7. The driving device according to claim 1, characterized in that: One of the first rotating shaft (13) and the rotating shaft (30) is provided with a threaded section, and the other of the first rotating shaft (13) and the rotating shaft (30) is provided with a threaded hole matched with the threaded section.

8. The driving device according to claim 1, characterized in that: The inner diameter of the through hole (231) is greater than the outer diameter of the rotary shaft (30).

9. The driving device according to claim 1, characterized in that: A linear bearing (70) is sleeved on the rotary shaft (30), and the linear bearing (70) is arranged at one end of the rotary shaft (30) away from the first rotating shaft (13) and is located in the through hole (231).

10. The driving device according to claim 1, characterized in that: A protruding section (301) is provided at one end of the rotary transformer shaft (30) away from the first rotating shaft (13); the protruding section (301) protrudes from the end of the second rotating shaft (23) away from the first rotating shaft (13); and the first rotary transformer (41) is sleeved on the protruding section (301).

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