Dual-voltage motor

Abstract

The present application discloses a dual-voltage motor, comprising a base, a stator assembly and a rotor assembly, wherein the base has a cavity, the stator assembly is located in the cavity, the stator assembly is fixedly connected to the base, the base supports the rotor assembly, the stator assembly comprises a first winding and a second winding, one of the first winding and the second winding is used to connect to a variable frequency power supply, and the other is used to connect to an emergency power supply, the first winding is located on the outside of the second winding, the rotor assembly and the stator assembly are coaxially arranged, reducing the size of the stator assembly, thereby reducing the space occupied by the motor and improving space utilization.

Description

Technical Field

[0001] The present application relates to the technical field of special-purpose motors, and in particular, to a dual-voltage motor. Background Art

[0002] Under certain special working conditions, the motor is normally powered by a medium-voltage or high-voltage variable-frequency power supply. In abnormal situations such as accidents and variable-frequency power supply failures, the motor is not allowed to stop, but can continue to run at a low speed.

[0003] At present, a separate auxiliary machine is often added to ensure that the motor runs at low speed without stopping. However, this separate auxiliary machine is set separately from the motor, and it is necessary to add auxiliary bases, couplings, brackets and other structural components. The installation is complicated and the reliability is poor. At the same time, it takes up a large space. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a dual-voltage motor to solve the problem that existing motors occupy a large space and have a complex structure.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] The present application provides a dual-voltage motor, comprising:

[0007] a machine base having a cavity;

[0008] a stator assembly located in the cavity, the stator assembly being fixedly connected to the base, the stator assembly comprising a first winding and a second winding, the first winding being located outside the second winding; and

[0009] a rotor assembly, coaxially arranged with the stator assembly, the base supporting the rotor assembly;

[0010] Among them, one of the first winding and the second winding is used to connect to a variable frequency power supply, and the other is used to connect to an emergency power supply.

[0011] Furthermore, the rotor assembly comprises:

[0012] a rotating shaft, the base supporting the rotating shaft;

[0013] a bracket, key-connected to the rotating shaft; and

[0014] The rotor is connected to the bracket, and the bracket supports the rotor.

[0015] Furthermore, the stator assembly further comprises:

[0016] a stator core having an open groove, the stator core being fixedly connected to the base, the first winding being located at the bottom of the groove, and the second winding being located at the opening of the groove; and

[0017] a separator block, the separator block being located between the first winding and the second winding to separate the first winding from the second winding;

[0018] Wherein, the first winding and the second winding are concentrically arranged around the stator core.

[0019] Furthermore, the base has two mounting holes, the rotor assembly rotates in a vertical direction, and the dual-voltage motor further includes:

[0020] a first sliding bearing, disposed in one of the mounting holes of the base, the first sliding bearing being located at a lower portion of the rotor assembly; and

[0021] A second sliding bearing is provided in the other mounting hole of the machine base. The second sliding bearing is located on the upper portion of the rotor assembly. The second sliding bearing and the first sliding bearing support the rotor assembly.

[0022] Furthermore, the first sliding bearing is a thrust sliding bearing; and / or,

[0023] The weight of the first sliding bearing is greater than the weight of the second sliding bearing; and / or,

[0024] The distance between the first sliding bearing and the center of gravity of the dual-pressure motor is smaller than the distance between the second sliding bearing and the center of gravity of the dual-pressure motor; and / or,

[0025] The bearing bush of the first sliding bearing is a plastic bush or a metal bush.

[0026] Furthermore, the dual-voltage motor further comprises:

[0027] a first cooler, located at a lower portion of the machine base, the first cooler being configured to cool the first sliding bearing; and

[0028] The second cooler is located on the upper portion of the machine base, and the second cooler is configured to cool the second sliding bearing.

[0029] Furthermore, the dual-voltage motor further includes a cooling cover having an oil cavity. The two cooling covers are respectively located at the upper and lower parts of the base, and the first cooler and the second cooler are respectively located in one of the oil cavities.

[0030] Furthermore, the dual-voltage motor further includes a third cooler, which is located between the machine base and the stator assembly and fixed to the machine base. The third cooler is used to dissipate heat from the stator assembly and the rotor assembly.

[0031] Furthermore, there are multiple third coolers, and the multiple third coolers are evenly arranged along the circumference of the stator assembly.

[0032] Furthermore, the number of slots of the stator assembly is 110-170, and the number of slots of the rotor assembly is 90-160.

[0033] The dual-voltage motor provided herein has a stator assembly located within a cavity of a motor base. The stator assembly is fixedly connected to the motor base, which supports the rotor assembly. The stator assembly includes a first winding and a second winding, one of which is connected to a variable-frequency power supply, and the other to an emergency power supply. The first winding is located outside the second winding, and the rotor assembly and stator assembly are arranged coaxially, reducing the size and weight of the stator assembly, thereby reducing the space occupied by the motor and improving space utilization. Furthermore, the dual-voltage motor is easy to install and disassemble, improving its reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A half-section schematic diagram of a dual-voltage motor provided in an embodiment of the present application;

[0035] Figure 2 for Figure 1 A partial enlarged view of point B in the middle;

[0036] Figure 3 for Figure 2 A partial schematic diagram from another perspective;

[0037] Figure 4 A half-section schematic diagram of a rotor assembly provided in an embodiment of the present application;

[0038] Figure 5 A half-section schematic diagram of a dual-voltage motor provided in an embodiment of the present application

[0039] Figure 6 for Figure 1 A partial enlarged view of point A in the middle; and

[0040] Figure 7 for Figure 1 A partial enlarged view of point C in the middle.

[0041] Description of reference numerals:

[0042] 1-base, 1A-cavity, 1B-mounting hole, 2-stator assembly, 21-first winding, 22-second winding, 23-stator core, 24-partition block, 25-groove, 3-rotor assembly, 31-rotating shaft, 32-bracket, 33-rotor, 4-first sliding bearing, 5-second sliding bearing, 6-first cooler, 7-second cooler, 8-cooling cover, 8A-oil chamber, 9-third cooler, 10-flywheel. DETAILED DESCRIPTION

[0043] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0044] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0045] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application.

[0046] Under certain special operating conditions, such as the motor used for reactor cooling and the main circulation sodium pump (hereinafter referred to as the "main pump"), which drives the coolant circulation within the reactor, the main pump needs to operate continuously in the reactor to remove heat generated by the core. The motor that drives the main pump is the key to driving the coolant circulation within the reactor. Under normal operating conditions, the motor is powered by a variable frequency power supply, driving the main pump to operate at the speed required by the reactor. In the event of a loss of off-site power, the diesel emergency power supply is activated. At this time, the main pump is not allowed to stop completely and must continue to operate to remove the residual heat from the reactor and ensure the safe operation of the reactor.

[0047] Due to the limited capacity of the emergency power supply, it's difficult to directly operate the electric motors. Typically, to achieve continuous motor operation, a main motor and an auxiliary motor are connected to a medium-voltage or high-voltage variable-frequency power supply and an emergency power supply, respectively. However, using two motors inevitably complicates the structure, significantly reducing safety, reliability, and maintainability, and not meeting the reactor's space requirements.

[0048] Therefore, achieving an integrated design for the main and auxiliary motors is paramount. In existing dual-voltage, multi-speed vertical motors, the main motor's stator is located above or below the auxiliary motor's stator, with the corresponding rotor cores mounted on the rotating shaft. This arrangement of the main and auxiliary stators increases the motor's height and weight, hindering vibration control and resistance to seismic loads. Furthermore, the presence of two rotor cores increases structural complexity and reduces motor reliability.

[0049] In view of this, if Figures 1 to 3 As shown, an embodiment of the present application provides a dual-voltage motor, including a base 1, a stator assembly 2 and a rotor assembly 3, wherein the base 1 has a cavity 1A, the stator assembly 2 is located in the cavity 1A, the stator assembly 2 is fixedly connected to the base 1, the stator assembly 2 includes a first winding 21 and a second winding 22, the first winding 21 is located on the outside of the second winding 22, the rotor assembly 3 is coaxially arranged with the stator assembly 2, the base 1 supports the rotor assembly 3, one of the first winding 21 and the second winding 22 is used to connect to the variable frequency power supply, and the other is used to connect to the emergency power supply.

[0050] Specifically, the dual-voltage motor includes a flywheel 10, a base 1, a stator assembly 2, and a rotor assembly 3. The flywheel 10 is connected to the rotor assembly 3, and the stator assembly 2 is fixed to the base 1. The base 1 supports the rotor assembly 3. When the rotor assembly 3 rotates, the flywheel 10 stores energy. The stator assembly 2 and the rotor assembly 3 are coaxially arranged. For example, the cavity 1A of the base 1 is cylindrical, and the rotation center of the rotor assembly 3 coincides with the central axis of the cylindrical cavity 1A. The stator assembly 2 is fixed inside the cavity 1A of the base 1. The stator assembly 2 includes a first winding 21 and a second winding 22. The first winding 21 is located outside the second winding 22. One of the first winding 21 and the second winding 22 is connected to a variable frequency power supply, and the other is connected to an emergency power supply. Under normal operating conditions of the dual-voltage motor, one of the first winding 21 and the second winding 22, powered by the variable frequency power supply, drives the rotor assembly 3 to rotate, thereby driving the reactor's main pump and circulating the coolant. In the event of a variable frequency power supply failure, another winding is connected to the emergency power supply, allowing the main pump to continue running, removing excess heat and improving the safety and reliability of reactor operation.

[0051] For example, the variable frequency power supply is 10kV and the emergency power supply is 0.4kV. The first winding 21 uses a voltage of 10kV and is adjusted in speed by a frequency converter as needed. The second winding 22 uses 0.4kV and is directly powered by a safety-grade transformer.

[0052] It should be understood that the above description uses only an example in which the first winding 21 uses a voltage of 10 kV and the second winding 22 uses a voltage of 0.4 kV, and should not be construed as limiting the present application. For example, the second winding 22 may use a voltage of 10 kV and be speed-regulated as needed by a frequency converter, while the first winding 21 may use a voltage of 0.4 kV and be powered directly by a safety-rated transformer.

[0053] Since the first winding 21 is located on the outside of the second winding 22, the rotor assembly 3 is coaxially arranged with the stator assembly 2, the base 1 supports the rotor assembly 3, and one of the first winding 21 and the second winding 22 is connected to the variable frequency power supply, and the other is connected to the emergency power supply. Thus, while meeting the dual voltage requirements, the size of the dual-voltage motor is reduced, the space occupied by the dual-voltage motor is reduced, and the complexity of the structure is reduced, thereby improving reliability.

[0054] In one embodiment, if Figure 2 and Figure 3 As shown, the stator assembly 2 also includes a stator core 23 and a separator 24. The stator core 23 has an open groove 25. The stator core 23 is fixedly connected to the base 1. The first winding 21 is located at the bottom of the groove 25, and the second winding 22 is located at the opening of the groove 25. The separator 24 is located between the first winding 21 and the second winding 22 to separate the first winding 21 and the second winding 22. The first winding 21 and the second winding 22 are concentrically arranged around the stator core 23.

[0055] Specifically, the stator core 23 is located within the cavity 1A and is fixed to the base 1. The second winding 22 is located at the opening of a groove 25 in the stator core 23, and the first winding 21 is located at the bottom of the groove 25. The separator 24 is located between the first winding 21 and the second winding 22 to separate the first winding 21 and the second winding 22, thereby reducing the mutual influence between the first winding 21 and the second winding 22 during operation of the dual-voltage motor and improving the anti-interference capability of the stator assembly 2. For example, the stator core 23 is provided with a plurality of grooves 25, and the first winding 21 is sequentially arranged in the plurality of grooves 25 and is located at the bottom of the plurality of grooves 25. The second winding 22 is arranged in the same order and is arranged at the opening of the plurality of grooves 25.

[0056] It should be understood that the first winding 21 and the second winding 22 are concentrically arranged around the stator core 23, which means that the first winding 21 is located at the bottom of the groove 25 and is sequentially passed through multiple grooves 25, and the second winding 22 is sequentially passed through the openings of multiple grooves 25 in the order of passing the first winding 21, so that the first winding 21 and the second winding 22 are both located on the circumferential side of the rotation center axis of the rotor assembly 3.

[0057] In one embodiment, if Figure 4As shown, the rotor assembly 3 includes a rotating shaft 31 , a bracket 32 and a rotor 33 , wherein the base 1 supports the rotating shaft 31 , the bracket 32 is key-connected to the rotating shaft 31 , the rotor 33 is connected to the bracket 32 , and the bracket 32 supports the rotor 33 .

[0058] Specifically, multiple copper bars are arranged along the circumference of the rotating shaft 31 to form a rotor 33. The bracket 32 is connected to the rotor 33 and supports the rotor 33. The base 1 supports the rotating shaft 31. The rotating shaft 31 is connected to the bracket 32 through a key. Therefore, under the drive of the stator assembly 2, the rotor 33 drives the rotating shaft 31 to rotate, so that the rotor assembly 3 drives the main pump to operate and drive the cooling cycle.

[0059] For example, under normal operation, the first winding 21 is powered by a 10kV variable frequency power supply, driving the rotor 33 to move, and then driving the rotating shaft 31 to rotate through the bracket 32; in the event of a failure of the high-voltage variable frequency power supply, the second winding 22 is powered by a 0.4kV voltage transformer, driving the rotor 33 to move, and then driving the rotating shaft 31 to rotate through the bracket 32.

[0060] In one embodiment, the number of slots in the stator assembly 2 is 110 to 170, and the number of slots in the rotor assembly 3 is 90 to 160. Specifically, the number of slots in the stator core 23 of the stator assembly 2 is 110 to 170. The first winding 21 and the second winding 22 are sequentially arranged in a plurality of grooves 25 of the stator assembly 2. The first winding 21 and the second winding 22 are separated by a separator 24. The number of slots in the rotor 33 of the rotor assembly 3 is 90 to 160. Since the number of slots in the stator assembly 2 is 110 to 170 and the number of slots in the rotor assembly 3 is 90 to 160, the parasitic loss of the dual-voltage motor is reduced, as well as the noise and vibration of the dual-voltage motor. In particular, the noise level of the dual-voltage motor during no-load steady-state operation does not exceed 82dB(A) (tested according to standard GB10069.3), the no-load vibration speed does not exceed 0.5mm / s (tested according to standard GB10068), and the starting torque of the dual-voltage motor driven by the emergency power supply at a voltage of 380V exceeds 26000N.m.

[0061] In one embodiment, if Figures 5-7 As shown, the base 1 has two mounting holes 1B, and the rotor assembly 3 rotates in a vertical direction. The dual-pressure motor further includes a first sliding bearing 4 and a second sliding bearing 5, wherein the first sliding bearing 4 is arranged in a mounting hole 1B of the base 1, and the first sliding bearing 4 is located at the lower part of the rotor assembly 3, and the second sliding bearing 5 is arranged in another mounting hole 1B of the base 1, and the second sliding bearing 5 is located at the upper part of the rotor assembly 3. The second sliding bearing 5 and the first sliding bearing 4 support the rotor assembly 3.

[0062] Specifically, the dual-pressure motor is arranged vertically, and the rotor assembly 3 rotates in the vertical direction. The first sliding bearing 4 is located at the bottom of the rotor assembly 3, and the second sliding bearing 5 is located at the top of the rotor assembly 3. The base 1 is provided with two mounting holes 1B in the vertical direction. The first sliding bearing 4 is installed in one mounting hole 1B of the base 1, and the second sliding bearing 5 is installed in the other mounting hole 1B of the base 1. The rotor assembly 3 is supported by the second sliding bearing 5 and the first sliding bearing 4. In particular, the first sliding bearing 4 is a thrust sliding bearing. For example, the second sliding bearing 5 is located above the rotating shaft 31 of the rotor assembly 3, and the first sliding bearing 4 is located below the rotating shaft 31 of the rotor assembly 3. The second sliding bearing 5 and the first sliding bearing 4 jointly support the rotating shaft 31. Driven by the stator assembly 2 and the rotor assembly 3, the second sliding bearing 5 and the first sliding bearing 4 support the rotating shaft 31 for rotation. The flywheel 10 is arranged below the first sliding bearing 4 to increase the rotational inertia of the dual-pressure motor and, at the same time, reduce the center of gravity height of the rotor assembly 3, thereby reducing the rotation of the dual-pressure motor and improving the stability of the dual-pressure motor operation.

[0063] In one embodiment, the weight of the first sliding bearing 4 is greater than the weight of the second sliding bearing 5, thereby lowering the center of gravity of the rotor assembly 3, further lowering the center of gravity of the dual-pressure motor, and improving the stability and vibration resistance of the dual-pressure motor. For example, the first sliding bearing 4 is a thrust sliding bearing, and the second sliding bearing 5 is lighter than the thrust sliding bearing.

[0064] In one embodiment, the distance between the first sliding bearing 4 and the center of gravity of the dual-pressure motor is smaller than the distance between the second sliding bearing 5 and the center of gravity of the dual-pressure motor. Specifically, the first sliding bearing 4 is closer to the center of gravity of the dual-pressure motor than the second sliding bearing 5, thereby reducing vibration of the dual-pressure motor and making the dual-pressure motor more stable.

[0065] In one embodiment, the bearing pads of the first sliding bearing 4 are plastic or metal. Specifically, the thrust pads of the first sliding bearing 4 are low-friction plastic or metal pads. For example, low-friction plastic is used for the thrust pads of the first sliding bearing 4, thereby reducing the friction torque between the rotating shaft 31 and the bearing pads, allowing the rotating shaft 31 and the first sliding bearing 4 to rotate more smoothly. In particular, when powered by an emergency power supply, the low-friction plastic used for the thrust pads of the first sliding bearing 4 allows the dual-voltage motor to start smoothly, thereby improving the reliability of the dual-voltage motor's operation.

[0066] In one embodiment, if Figure 6 and Figure 7As shown, the dual-voltage motor also includes a first cooler 6 and a second cooler 7, wherein the first cooler 6 is located at the lower part of the machine base 1, and the first cooler 6 is configured to cool the first sliding bearing 4, and the second cooler 7 is located at the upper part of the machine base 1, and the second cooler 7 is configured to cool the second sliding bearing 5.

[0067] Specifically, the first cooler 6 is located at the bottom of the machine base 1 and is arranged around the outside of the first sliding bearing 4 to cool the first sliding bearing 4. The second cooler 7 is located at the top of the machine base 1 and is arranged around the outside of the second sliding bearing 5 to cool the second sliding bearing 5.

[0068] For example, the first cooler 6 and the second cooler 7 are both cooling water pipes, and the second sliding bearing 5 and the first sliding bearing 4 both adopt the form of external cooling water circulation. The cooling water pipes are arranged around the second sliding bearing 5 and the first sliding bearing 4, thereby improving the cooling efficiency of the second sliding bearing 5 and the first sliding bearing 4.

[0069] In one embodiment, the dual-voltage motor further includes a cooling cover 8 having an oil cavity 8A. The two cooling covers 8 are respectively located at the upper and lower parts of the base 1 . The first cooler 6 and the second cooler 7 are respectively located in an oil cavity 8A.

[0070] Specifically, cooling cover 8 located at the bottom of base 1 houses first cooler 6, which is located within oil chamber 8A. Cooling cover 8 located at the top of base 1 houses second cooler 7, which is located within oil chamber 8A. The presence of oil chamber 8A in cooling cover 8 eliminates the need for an additional external oil station, reduces the complexity of the main pump's auxiliary system, saves space for auxiliary system layout, and improves the reliability of the main pump.

[0071] For example, the second sliding bearing 5 and the first sliding bearing 4 both utilize internal circulation of lubricating oil and external circulation of cooling water. The first cooler 6 and the second cooler 7 are both cooling water pipes, which are arranged around the second sliding bearing 5 and the first sliding bearing 4, thereby improving the cooling efficiency of the second sliding bearing 5 and the first sliding bearing 4. Because the second sliding bearing 5 and the first sliding bearing 4 utilize a one-time oil injection and oil immersion self-lubrication lubrication method, it is unnecessary to set up an external oil station to supply oil to the second sliding bearing 5 and the first sliding bearing 4, simplifying the need for the main pump auxiliary system, reducing the complexity of the auxiliary system, saving space for the auxiliary system layout, reducing maintenance workload, and improving the reliability of the main pump.

[0072] In one embodiment, the dual-voltage motor further includes a third cooler 9, which is located between the base 1 and the stator assembly 2 and is fixed to the base 1. The third cooler 9 is used to dissipate heat from the stator assembly 2 and the rotor assembly 3 (see Figure 5 ).

[0073] Specifically, the third cooler 9 is fixed to the base 1 and located between the base 1 and the stator assembly 2. Heat is dissipated from the stator assembly 2 and the rotor assembly 3 through the third cooler 9. The dual-pressure motor uses air-water cooling. An air-water cooler is disposed outside the stator core 23. The air-water cooler is fixedly connected to the base 1 and located inside the cavity 1A. For example, a flange of the air-water cooler is secured to the base 1 using fasteners.

[0074] In particular, there are multiple third coolers 9, and the multiple third coolers 9 are evenly arranged along the circumference of the stator assembly 2. For example, four air-to-water coolers are arranged in the cavity 1A of the base 1, and the four air-to-water coolers are evenly arranged along the circumference of the stator assembly 2, and the air-to-water coolers are arranged outside the stator core 23.

[0075] In order to better understand the dual-voltage motor of the embodiment of the present application, a comparative explanation is now provided in conjunction with a motor with dual windings arranged vertically.

[0076] Table 1 Comparative analysis of two main and auxiliary winding integrated motor structures

[0077]

[0078]

[0079] In Table 1, the rated power of the main motor is the rated power of the dual-voltage motor under normal working conditions, for example, the rated power when the variable frequency power supply is connected to 10kV. The rated power of the auxiliary motor is the rated power of the dual-voltage motor under the action of the emergency power supply, for example, the emergency power supply is 380V.

[0080] From Table 1, it can be seen that the total height, rotor weight, and total weight of the dual-pressure motor of the present application are lower than those of the motor with dual windings arranged up and down. In particular, in terms of base height, pump system, maintenance convenience and vibration control, the dual-pressure motor of the present application has huge advantages.

[0081] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present application.

Claims

1. A dual-pressure motor for driving the main circulation sodium pump of a reactor, characterized in that: include: a machine base having a cavity; A stator assembly is located in the cavity, the stator assembly is fixedly connected to the base, the number of slots in the stator assembly is 110 to 170, and the stator assembly includes a first winding, a second winding, and a separator block. The first winding is located outside the second winding, and the separator block is located between the first winding and the second winding to separate the first winding from the second winding. The relative direction of the first winding and the second winding is a first direction, and the second direction is perpendicular to the first direction. On a projection plane perpendicular to the second direction, at least a portion of the projection of the first winding is located outside the projection of the separator block, and at least a portion of the projection of the second winding is located outside the projection of the separator block. as well as a rotor assembly, coaxially arranged with the stator assembly, the base supporting the rotor assembly, the number of slots of the rotor assembly being 90 to 160; a flywheel connected to the rotor assembly and configured to store energy; Wherein, the first winding is used to connect to the variable frequency power supply, and the second winding is used to connect to the emergency power supply; Wherein, under normal operating conditions, the variable frequency power supply supplies power to the first winding; when the variable frequency power supply fails, the emergency power supply supplies power to the second winding connected thereto; The base has two mounting holes, and the rotor assembly rotates in a vertical direction. The dual-pressure motor further includes: a first sliding bearing, disposed in one of the mounting holes of the base, the first sliding bearing being located at a lower portion of the rotor assembly, the bearing bushing of the first sliding bearing being a plastic bushing; and A second sliding bearing is arranged in the other mounting hole of the machine base, the second sliding bearing is located on the upper part of the rotor assembly, and the second sliding bearing and the first sliding bearing support the rotor assembly; the distance between the first sliding bearing and the center of gravity of the dual-pressure motor is smaller than the distance between the second sliding bearing and the center of gravity of the dual-pressure motor.

2. The dual-voltage motor according to claim 1, characterized in that: The rotor assembly comprises: a rotating shaft, the base supporting the rotating shaft; a bracket, key-connected to the rotating shaft; and The rotor is connected to the bracket, and the bracket supports the rotor.

3. The dual-voltage motor according to claim 1, characterized in that: The stator assembly further comprises: a stator core having an open groove, the stator core being fixedly connected to the base, the first winding being located at the bottom of the groove, and the second winding being located at the opening of the groove; Wherein, the first winding and the second winding are concentrically arranged around the stator core.

4. The dual-voltage motor according to claim 1, characterized in that: The first sliding bearing is a thrust sliding bearing; and / or, The weight of the first sliding bearing is greater than the weight of the second sliding bearing.

5. The dual-voltage motor according to claim 1, characterized in that: The dual-voltage motor further comprises: a first cooler, located at a lower portion of the machine base, the first cooler being configured to cool the first sliding bearing; and The second cooler is located on the upper portion of the machine base, and the second cooler is configured to cool the second sliding bearing.

6. The dual-voltage motor according to claim 5, characterized in that: The dual-pressure motor further includes a cooling cover having an oil cavity. The two cooling covers are respectively located at the upper and lower parts of the base. The first cooler and the second cooler are respectively located in one of the oil cavities.

7. The dual-voltage motor according to claim 1, characterized in that: The dual-voltage motor further includes a third cooler, which is located between the machine base and the stator assembly and fixed to the machine base. The third cooler is used to dissipate heat from the stator assembly and the rotor assembly.

8. The dual-voltage motor according to claim 7, characterized in that: There are multiple third coolers, and the multiple third coolers are evenly arranged along the circumference of the stator assembly.

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