A liquid-cooled DC generator

Abstract

This utility model relates to a liquid-cooled DC generator, including a motor housing, inside which a stator assembly and a rotor assembly are coaxially connected; a controller cavity is located at the rear end of the motor housing, and a controller module is housed within the controller cavity; a motor cooling housing is connected to the outside of the stator assembly, and a housing cooling cavity is formed between the circumferential side of the motor cooling housing and the motor housing, and a rear cooling cavity is formed between the end of the motor cooling housing and the motor housing, and the housing cooling cavity and the rear cooling cavity are connected. By placing the control module at the rear, the horizontal space of the generator is utilized, saving vertical space. The saved vertical space expands the generator housing to accommodate the cooling housing, and the housing cooling cavity formed by the cooling housing is connected to the rear cooling cavity, simultaneously dissipating heat for the generator body, the rear bearing, and the control module.

Description

Technical Field

[0001] This utility model relates to the field of motor cooling technology, specifically to a liquid-cooled DC generator. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Range extender systems are widely used in passenger cars, trucks, buses and other vehicles. As a core component, the range extender generator has an increasing power demand. Generators cooled by liquid cooling have the advantages of high power density, small size and light weight. However, if the heat inside the motor and the control module is dissipated only by the cooling chamber in the middle of the motor cooling housing, high temperature can still easily occur during long-term operation.

[0004] To address the heat dissipation problem of range extender generators, existing technologies connect the end cover water passages and the motor water passages using connecting pins to increase the circulation of the motor cooling water and indirectly improve heat dissipation. However, this method results in a complex cooling water passage structure with a relatively high risk of leakage.

[0005] Meanwhile, most passenger car engines are transversely mounted and located at the front of the driver's cab; most commercial vehicle engines are longitudinally mounted and located below the driver's cab. In both types of vehicles, the range extender generator is arranged coaxially with the engine, and the controller of the range extender generator is usually located above the generator. The height space between the engine and the driver's cab is too compact, and placing the controller above the generator will occupy the already compact height space, resulting in the cooling water channel not being able to utilize the height space to increase the circulation volume to solve the heat dissipation problem. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model provides a liquid-cooled DC generator, which achieves high space compression by optimizing the generator structure layout and heat dissipation design, while improving heat dissipation efficiency and system reliability.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a liquid-cooled DC generator, including a motor housing, inside which a stator assembly and a rotor assembly are coaxially connected; a controller cavity is provided at the rear end of the motor housing, and a controller module is provided inside the controller cavity; a motor cooling shell is connected to the outside of the stator assembly, and a shell cooling cavity is formed between the circumferential side of the motor cooling shell and the motor housing, and a rear cooling cavity is formed between the end of the motor cooling shell and the motor housing, and the shell cooling cavity and the rear cooling cavity are connected.

[0009] Furthermore, the motor housing has a front cover at the front end and a rear cover at the rear end. The control compartment cover is connected to the outside of the rear cover, and a controller cavity is formed between the rear cover and the control compartment cover. The controller cavity houses the control module.

[0010] Furthermore, thermally conductive silicone is provided between the control module and the rear cover.

[0011] Furthermore, the stator assembly leads pass through the rear end cover and connect to the control module. The control module is connected to the high-voltage interface and the low-voltage interface via wires. The high-voltage interface and the low-voltage interface are located on the motor housing.

[0012] Furthermore, the motor cooling housing is a cylindrical shape with one end open and the other end closed. The outer wall is divided into a circumferential area and an end face area. The circumferential area is provided with multiple first guide ribs arranged along the generator axis. The first guide ribs are arranged in an alternating manner to form multiple sets of flow channels arranged in parallel around the generator axis. The flow channels and the motor housing form a housing cooling cavity.

[0013] Furthermore, each set of flow channels is connected end to end. The two adjacent sets of flow channels are the first-stage flow channel and the last-stage flow channel, respectively. The first-stage flow channel does not participate in the circulation of cooling liquid, and the first-stage flow channel is provided with a first inlet / outlet liquid chamber and a second inlet / outlet liquid chamber that are not connected to each other. The last-stage flow channel is provided with a third inlet / outlet liquid chamber. The second inlet / outlet liquid chamber is connected to the secondary flow channel, the last-stage flow channel is connected to the third inlet / outlet liquid chamber, the third inlet / outlet liquid chamber is connected to the rear cooling chamber, and the rear cooling chamber is connected to the first inlet / outlet liquid chamber.

[0014] Furthermore, the motor housing is a cylindrical shape with one end open and the other end closed, and the rear end is a closed end, with the inner wall surface of the closed end and the outer wall surface of the closed end of the motor cooling housing forming a rear cooling cavity; or, the motor housing is a hollow cylindrical shape with both ends open.

[0015] Furthermore, the rear cooling cavity includes a second guide rib disposed on the inner wall of the closed end of the motor housing, the second guide rib forming a flow channel that connects the beginning and end of the rear cooling cavity; or, a second guide rib disposed on the inner wall of the closed end of the motor cooling housing, the second guide rib forming a flow channel that connects the beginning and end of the rear cooling cavity, and a cover plate is provided on the flow channel.

[0016] Furthermore, a third and a fourth liquid inlet / outlet are provided on the outer circumferential area of ​​the motor housing for the inlet / outlet of external cooling liquid.

[0017] Furthermore, the third inlet / outlet corresponds to and is connected to the first inlet / outlet chamber, the fourth inlet / outlet corresponds to and is connected to the second inlet / outlet chamber, and the two ends of the flow channel in the rear cooling chamber are connected to the first inlet / outlet chamber and the third inlet / outlet chamber, respectively.

[0018] Furthermore, the motor cooling housing and the motor housing are coaxially sleeved, with the open end being the front end, which is connected to the front end cover, and the closed end being the rear end, which is provided with a cable outlet.

[0019] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0020] 1. The control module is designed to be rear-mounted, making full use of the generator's lateral space and reducing the vertical space occupied. The controller cavity and the motor housing are integrated into one unit, significantly reducing the generator height. The saved height allows for the expansion of the generator housing, thereby accommodating the motor cooling housing between the stator assembly and the generator housing. When coolant is introduced, a housing cooling cavity is formed to dissipate heat from the generator's circumferential area.

[0021] 2. When the controller cavity is located at the rear, the space at the end of the generator can be used to form a rear cooling cavity between the motor cooling housing and the rear end cover of the generator housing. This can enhance the heat dissipation of the motor interior and control module, extend the life of power devices, and dissipate heat at the ends of the excitation winding and armature winding, as well as the bearings.

[0022] 3. The cooling channels inside the shell cooling chamber and the rear cooling chamber are formed by opening guide ribs to guide the coolant to flow in the two cooling chambers and improve the heat dissipation effect.

[0023] 4. The flow channel formed by the guide ribs connects the cooling chamber of the housing and the cooling chamber of the rear end. The cooling liquid can connect with the two cooling chambers through the inlet / outlet of the motor cooling housing, forming a complete circulating cooling flow channel. This eliminates the need for connecting pins and other connecting parts, reduces the risk of failure caused by connecting parts, improves reliability, and makes better use of the height space of the generator. Attached Figure Description

[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0025] Figure 1 This is a schematic cross-sectional view of the generator provided in Embodiment 1 of this utility model;

[0026] Figure 2 This is a schematic diagram of the rotor assembly structure provided in Embodiment 1 of this utility model;

[0027] Figure 3 This is a schematic diagram of the stator assembly structure provided in Embodiment 1 of this utility model;

[0028] Figure 4 This is a schematic diagram of the motor cooling housing structure provided in Embodiment 1 of this utility model;

[0029] Figure 5 This is a schematic diagram of the motor housing structure provided in Embodiment 1 of this utility model;

[0030] Figure 6 This is a cross-sectional view of the assembly structure of the motor housing, cooling housing, and front end cover provided in Embodiment 1 of this utility model;

[0031] Figure 7 This is a schematic diagram of the external structure of the DC generator provided in Embodiment 1 of this utility model;

[0032] Figure 8 This is a cross-sectional view of the assembly structure of the motor housing, cooling housing, and front end cover provided in Embodiment 2 of this utility model;

[0033] Figure 9 This is a schematic diagram of the outer wall structure of the motor cooling housing provided in Embodiment 2 of this utility model;

[0034] Figure 10 This is a schematic diagram of the internal structure of the motor cooling housing provided in Embodiment 2 of this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of the motor housing provided in Embodiment 2 of this utility model.

[0036] In the diagram: 1. Front cover, 2. Motor cooling housing, 3. Housing cooling cavity, 4. Motor outer casing, 5. Stator assembly, 6. Rotor assembly, 7. Lead wire, 8. Controller cavity, 9. Control module, 10. Rear cooling cavity, 11. Thermal conductive silicone, 12. Control compartment cover, 13. Motor shaft, 14. Front bearing, 15. Balance pressure plate, 16. Rear bearing, 17. Rotor core, 18. Stator core, 19. Excitation winding, 20. Armature winding, 21. First guide rib, 22. First inlet / outlet cavity, 23. Second inlet / outlet cavity, 23. Third inlet / outlet cavity, 24. Outlet port, 25. Second guide rib, 26. First inlet / outlet port, 27. Second inlet / outlet port, 28. Rear bearing chamber, 29. Front bearing chamber, 30. Low-pressure interface, 31. High-pressure interface, 32. Cover plate, 33. Rear flow channel. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Unless otherwise specified, the generator in the following embodiments refers to a Wound-Field Doubly Salient Electrically Excited DC Starter / Generator, which is a composite motor that combines a doubly salient pole structure, electrical excitation technology, and a DC power system. It has both starting and generating functions and is suitable for multi-voltage (different voltage) application scenarios.

[0041] Most range extenders use permanent magnet synchronous motors (including permanent magnet synchronous radial field motors and permanent magnet synchronous axial field motors) as their starter generators. The cost of rare-earth permanent magnet materials required to manufacture these motors is increasing year by year. The electrically excited doubly salient pole DC starter generator is a type of doubly salient pole starter generator that does not use permanent magnet materials but is electrically excited. Its rotor has no windings, while the stator teeth are fitted with concentrated armature windings. The three-phase windings are rectified by diodes. The stator yoke or stator teeth are equipped with excitation windings. This type of motor has a simple structure, high reliability, and low cost, making it suitable for the electric vehicle field.

[0042] The basic structure and working principle of the electrically excited doubly salient pole differential voltage DC starter generator are as follows:

[0043] Double salient pole stator and rotor: Both the stator and rotor are salient pole structures (tooth and slot design), without permanent magnets, and rely on the electric excitation winding to generate the magnetic field;

[0044] Magnetic field modulation: By changing the magnetic resistance through rotor rotation, the magnetic field path is modulated to achieve electromechanical energy conversion;

[0045] The excitation winding is installed on the stator and generates a controllable magnetic field through DC current excitation. The magnetic field strength is adjustable (better than the fixed magnetic field of a permanent magnet).

[0046] With multi-winding or tap design, it supports different voltage levels of output (such as 12V / 24V start-up, 270V high voltage power generation) to meet the multi-voltage requirements of vehicles / aviation.

[0047] In starting mode, it operates as an electric motor, powered by a battery (power battery). The energized field winding generates a magnetic field, and the interaction between the armature current and the magnetic field produces torque, driving the engine to start. Because the magnetic field of the electric excitation is adjustable, it can adapt to the starting requirements of low temperature and high torque.

[0048] In generator mode, the engine drives the rotor to rotate, energizing the stator excitation winding. This induces alternating current in the armature winding through changes in the bisalient pole reluctance, which is then rectified to output direct current. During this process, the output voltage is stabilized by controlling the excitation current to adapt to load changes.

[0049] Example 1:

[0050] The following embodiment provides a liquid-cooled DC generator that achieves high space compression while improving heat dissipation efficiency and system reliability by optimizing the generator's structural layout and heat dissipation design.

[0051] Specifically: By positioning the controller cavity at the rear and integrating it with the motor housing as a single unit, the generator's height is significantly reduced. The generator's rear-end cooling chamber enhances heat dissipation within the motor and control module, extending the lifespan of power devices, and also provides cooling for the excitation winding, armature winding ends, and bearings. A housing cooling chamber is also provided, connected to the rear-end cooling chamber via the inlet / outlet ports of the motor cooling housing, forming a complete circulating cooling channel. This eliminates the need for connecting pins and other connectors, reducing the risk of failures caused by connectors, improving reliability, and better utilizing the generator's height space, indirectly enhancing cooling capacity.

[0052] like Figure 1 As shown, a liquid-cooled DC generator includes a stator assembly 5 and a rotor assembly 6 coaxially connected. The stator assembly 5 and the rotor assembly 6 are located inside a motor cooling housing 2. A motor housing 4 is provided on the outside of the motor cooling housing 2. A housing cooling cavity 3 is formed between the circumferential side of the motor cooling housing 2 and the motor housing 4.

[0053] The motor housing 4 has a front cover 1 at the front end and a rear cover at the rear end. The outer side of the rear cover is connected to the control compartment cover 12 to form a controller cavity 8, which houses the control module 9. The rear cooling cavity 10 is formed between the inner side of the rear cover and the end of the motor cooling housing 2.

[0054] The lead wire 7 of the stator assembly 5 passes through the rear end cover and connects to the control module 9. Thermally conductive silicone 11 is provided between the control module 9 and the rear end cover.

[0055] As a further embodiment, the rear cover and the motor housing 4 are integrated into one unit, and the controller cavity 8 is located at the rear. The motor housing 4 and the motor cooling housing 2 are heat-fitted together, and the resulting housing cooling cavity 3 is connected to the rear cooling cavity 10 to form a complete circulating cooling channel.

[0056] As a further embodiment, the front cover 1 is fixedly connected to the motor housing 4.

[0057] The stator assembly 5 is connected to the inner wall of the motor cooling housing 2, and the rotor assembly 6 is fitted into the center of the stator assembly 5 to form an electrically excited double salient pole structure. The front end cover 1 is fastened to the motor housing 4.

[0058] like Figure 2 As shown, the rotor assembly 6 has a salient pole structure, including two balance plates 15 arranged in parallel on the motor shaft 13. A front bearing 14 and a rear bearing 16 are provided on the outer side of the two balance plates 15, and a rotor core 17 is provided between the two balance plates 15.

[0059] like Figure 3 As shown, the stator assembly 5 has a salient pole structure and includes a stator core 18, on which an excitation winding 19 and an armature winding 20 are provided.

[0060] As a further implementation, the stator core 18 and the rotor core 17 adopt a 24 / 16 double salient pole structure, which is formed by riveting and welding silicon steel sheets.

[0061] As a further embodiment, an armature winding 20 is wound around each tooth of the stator core 18, and an excitation winding 19 is wound around every three armature windings to form a stator assembly 5 with a salient pole structure.

[0062] As a further embodiment, the outer wall of the stator core 18 is connected to the inner wall of the motor cooling housing 2.

[0063] In this embodiment, the rotor assembly 6 and the stator assembly 5 are mature existing technologies, and their specific structures are not described in detail.

[0064] like Figure 4 As shown, the motor cooling housing 2 is a cylindrical structure with one open end and one closed end. The open end is used to connect with the front cover 1, and the inner wall of the closed end is provided with a rear bearing chamber. The closed end is provided with a cable outlet 24, and the inner wall of the closed end is connected to the stator core 18. The outer wall is divided into a circumferential region and an end face region. The circumferential region is provided with multiple first guide ribs 21 arranged along the axis of the generator. The multiple first guide ribs 21 are arranged in an alternating manner to form multiple sets of flow channels arranged in parallel around the axis of the motor cooling housing 2. The flow channels and the circumferential region of the inner wall of the motor housing 4 form a housing cooling cavity 3.

[0065] In the shell cooling chamber 3, each set of flow channels is connected end to end. Two adjacent sets of flow channels are the first-stage flow channel and the last-stage flow channel, respectively. The first-stage flow channel does not participate in the circulation of cooling liquid. The first-stage flow channel is provided with a first inlet / outlet liquid chamber 22 and a second inlet / outlet liquid chamber 23 that are not connected to each other. The last-stage flow channel is provided with a third inlet / outlet liquid chamber 231.

[0066] The second inlet / outlet liquid chamber 23 is connected to the secondary flow channel, the secondary flow channel is connected to the third flow channel, and so on. The final flow channel is connected to the third inlet / outlet liquid chamber 231, the third inlet / outlet liquid chamber 231 is connected to the rear cooling chamber 10, and the rear cooling chamber 10 is connected to the first inlet / outlet liquid chamber 22.

[0067] like Figure 5 As shown, the motor housing 4 is a cylindrical shape with one end open and the other end closed. The open end of the cylinder is used to connect with the front cover 1. The inner wall surface of the closed end of the cylinder is provided with a second guide rib 25. The end face of the closed end is provided with a cable outlet 24, which corresponds to the position of the cable outlet 24 of the motor cooling housing 2. The outer wall surface of the closed end is provided with a controller cavity. The outer side of the circumferential area of ​​the cylinder is provided with a third liquid inlet / outlet 26 and a fourth liquid inlet / outlet 27.

[0068] As a further implementation, the lead wires 7 of the excitation winding 19 and the armature winding 20 are led out from the outlet 24 and connected to the control module 9.

[0069] The inner wall of the closed end of the motor housing 4 and the outer wall of the closed end of the motor cooling housing 2 form a rear cooling cavity 10, and the second guide rib 25 forms a flow channel that connects the beginning and end in the rear cooling cavity 10.

[0070] like Figure 6 As shown, the first inlet / outlet chamber 22 corresponds to and is connected to the third inlet / outlet port 26, and the second inlet / outlet chamber 23 corresponds to and is connected to the fourth inlet / outlet port 27. The two ends of the flow channel in the rear cooling chamber 10 are connected to the first inlet / outlet chamber 22 and the third inlet / outlet chamber 231, respectively. With this arrangement, the motor housing 4 and the motor cooling housing 2 form a heat dissipation area for the circumference of the generator, namely the housing cooling chamber 3, and a cooling area for the end of the generator, namely the rear cooling chamber 10, and the two cooling chambers are connected.

[0071] For example:

[0072] Cooling liquid enters the housing cooling chamber 3 through the fourth inlet / outlet port 27, passes through the second inlet / outlet port 23 to reach the secondary flow channel (the primary flow channel is used to arrange each cooling chamber and does not participate in circulation), and under the guidance of the first guide rib 21, flows through the secondary flow channel, the third flow channel and finally to the final flow channel to cool the circumferential area of ​​the generator.

[0073] When it flows to the final flow channel formed by the first guide rib 21, it enters the rear cooling chamber 10 through the third inlet / outlet liquid chamber 231 and is guided by the second guide rib 25 to cool the rear cover area of ​​the generator, which is the area where the controller is located. The heat generated by the controller is transferred to the cooling liquid passing through the rear cooling chamber 10 through the thermally conductive silicone 11 to achieve heat dissipation.

[0074] The cooling liquid flowing out of the rear cooling chamber 10 passes through the first inlet / outlet liquid chamber 22 and exits the motor housing 4 through the third inlet / outlet liquid port 26;

[0075] After the coolant is cooled again outside the motor housing 4, it continues to enter the housing cooling chamber 3 through the fourth inlet / outlet port 27 to participate in the next heat dissipation cycle.

[0076] In this embodiment, the flow direction of the cooling liquid is not restricted, and the above heat dissipation cycle is only used as an example.

[0077] In this embodiment, the flow channel arrangement in the housing cooling cavity 3 and the rear cooling cavity 10 is used to achieve the purpose of "connecting the two cooling cavities". The specific flow channel arrangement depends on the thermal load design of the generator, the flow rate of the cooling liquid, and the arrangement position of the two inlet / outlet ports on the motor housing 4. This embodiment is only for illustrative purposes.

[0078] The structure of the motor cooling housing 2, the motor outer housing 4, and the front cover 1 combined is as follows: Figure 6 As shown, the front cover 1 has a front bearing chamber 29, and the motor cooling housing 2 has a rear bearing chamber 28. The two bearing chambers are respectively used to accommodate... Figure 2 The front bearing 14 and the rear bearing 16 are shown in rotor assembly 6.

[0079] The outer side of the rear end cover of the motor housing 4 is provided with a controller cavity 8 to accommodate the control module 9. The control module 9 itself is a mature existing technology. This solution only limits the installation position of the control module. The specific structural form and specific control process of the control module are not further limited, and it can be an existing product.

[0080] like Figure 7 As shown, the motor housing 4 is provided with a low-voltage interface 30 and a high-voltage interface 31, which are used to divide the lines led out from the control module 9 into two parts: low voltage and high voltage. The low-voltage interface 30 serves as the low-voltage power supply and control signal interface, and the high-voltage interface 31 serves as the high-voltage power supply interface.

[0081] This design places the control module at the rear, utilizing the lateral space of the generator and reducing vertical space occupation. Considering the compact vertical space between the engine and the driver's cab in existing commercial and passenger vehicle layouts, and the need for the range extender's generator to be coaxially aligned with the engine, the space above the generator, originally intended to house the controller, is limited. Therefore, this design places the controller housing at the rear and integrates it with the motor housing as a single unit, significantly reducing the generator height.

[0082] When the controller cavity is placed at the rear, the vertical height space is saved. The saved space can be used to expand the generator housing, thereby accommodating the motor cooling housing between the stator assembly and the generator housing. By opening guide ribs on the surface of the motor cooling housing to form flow channels, a housing cooling cavity 3 for heat dissipation in the circumferential area of ​​the generator is obtained.

[0083] When the controller cavity is located at the rear, the space at the generator end can be used to form a rear cooling cavity between the motor cooling housing and the rear end cover of the generator housing. This can enhance the heat dissipation of the motor interior and control module, extend the life of power devices, and dissipate heat at the ends of the excitation winding and armature winding, as well as the bearings.

[0084] The flow channel design formed by the guide ribs connects the cooling chamber of the housing and the cooling chamber of the rear end through the inlet / outlet of the motor cooling housing, forming a complete circulating cooling channel. This eliminates the need for other connecting parts such as connecting pins, reducing the risk of failure caused by connecting parts and improving reliability. By making better use of the height space of the generator, the cooling capacity is indirectly improved.

[0085] Example 2:

[0086] This embodiment changes the shape of the rear cooling cavity. In the first embodiment, the rear cooling cavity is formed by the second guide rib 25 set on the inner wall of the cylindrical closed end of the motor housing 4. In this embodiment, the second guide rib 25 together with the formed rear flow channel 33 is set on the motor cooling housing 2. By changing the setting position of the second guide rib 25, the rear cooling cavity is still formed after the motor cooling housing 2 and the motor housing 4 are assembled.

[0087] Specifically, such as Figures 8-11 As shown, the motor cooling housing 2 is a cylindrical structure with one end open and the other end closed. The open end is used to connect with the front cover 1, and the closed end is provided with a cable outlet 24. The outer wall of the closed end is provided with a controller cavity 8, and the inner wall of the closed end is provided with a rear flow channel 33. The rear flow channel 33 is provided with a second guide rib 25, and the rear flow channel 33 is covered by a cover plate 32.

[0088] In this embodiment, the structure of the circumferential region of the motor cooling housing 2 is the same as that in Embodiment 1. Multiple sets of flow channels are formed by multiple staggered first guide ribs 21, which are arranged in parallel around the axis of the motor cooling housing 2. After the motor cooling housing 2 and the motor housing 4 are assembled, the flow channels and the circumferential region of the inner wall of the motor housing 4 form a housing cooling cavity 3.

[0089] This embodiment modifies the structure of the closed end of the motor cooling housing 2. A second guide rib 25 is placed on the inner wall of the closed end of the motor cooling housing 2 to form a rear flow channel 33. A cover plate 32 is provided on the rear flow channel 33 to ensure a seal. The motor cooling housing 2 is welded to the cover plate 32 to form a rear cooling cavity 10. Since the controller cavity 8 is located on the outer wall of the closed end, the rear cooling cavity 10 can also dissipate heat from the controller, functioning the same as in Embodiment 1. Simultaneously, the shape of the cable outlet 24 is adjusted to accommodate the aforementioned changes.

[0090] Correspondingly, the motor housing 4 is a hollow cylindrical structure open at both ends, such as... Figure 11 As shown, a third liquid inlet / outlet 26 and a fourth liquid inlet / outlet 27 are provided on the outer side of the circumferential area.

[0091] In this embodiment, both the housing flow channel and the rear flow channel are located on the outer circumferential wall of the motor cooling housing. The structure of the housing flow channel and the housing cooling cavity formed therefrom is the same as in Embodiment 1. The rear flow channel is changed from the motor housing 4 in Embodiment 1 to the motor cooling housing 2. The rear flow channel and the inner wall of the cover plate form the rear cooling cavity. The motor housing 4 becomes a hollow cylindrical structure with openings at both ends.

[0092] This structure is adopted for ease of processing. All cooling channels are set on the motor cooling housing 2, while the motor housing 4 adopts a relatively simple hollow cylindrical structure, which facilitates unified management and processing of various components during the design and manufacturing stages.

[0093] Meanwhile, this structure reduces the number of sealing points. In Embodiment 1, the rear cooling cavity is formed at the end by nesting the motor cooling housing 2 and the motor housing 4. Assemblies need to be considered to ensure the sealing effect of the rear cooling cavity. In this embodiment, the rear cooling cavity is formed by connecting the rear flow channel to the inner wall of the cover plate. The cover plate is first connected to the rear flow channel to ensure the sealing requirements are met before assembling the motor cooling housing 2 and the motor housing 4. The cover plate and the rear flow channel can be connected using more reliable sealing methods such as welding. During motor maintenance, since both ends of the motor housing 4 are open, the rear cooling cavity can be exposed on the outside of the motor housing 4, making it easier to inspect and repair.

[0094] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A liquid-cooled dynamo electric machine characterized by comprising: It includes a motor housing, inside which are a stator assembly and a rotor assembly coaxially connected; a controller cavity is located at the rear end of the motor housing, and a controller module is located inside the controller cavity; a motor cooling housing is connected to the outside of the stator assembly, and a housing cooling cavity is formed between the circumferential side of the motor cooling housing and the motor housing, and a rear cooling cavity is formed between the end of the motor cooling housing and the motor housing, and the housing cooling cavity and the rear cooling cavity are connected.

2. A liquid-cooled dynamo as claimed in claim 1, characterized in that The motor housing has a front cover at the front end and a rear cover at the rear end. The control compartment cover is connected to the outside of the rear cover. A controller cavity is formed between the rear cover and the control compartment cover. The controller cavity houses the control module.

3. A liquid-cooled dynamo as claimed in claim 2, characterized in that Thermally conductive silicone is provided between the control module and the rear cover.

4. A liquid-cooled dynamo as claimed in claim 1, characterized in that The stator assembly's lead wires pass through the rear end cover and connect to the control module. The control module is connected to the high-voltage interface and the low-voltage interface via wires. The high-voltage interface and the low-voltage interface are located on the motor housing.

5. A liquid-cooled dynamo as claimed in claim 1, characterized in that The motor cooling housing is a cylindrical shape with one end open and the other end closed. The outer wall is divided into a circumferential area and an end face area. The circumferential area is provided with multiple first guide ribs arranged along the generator axis. The first guide ribs are arranged in an alternating manner to form multiple sets of flow channels arranged in parallel around the generator axis. The flow channels and the motor housing form a housing cooling cavity.

6. A liquid-cooled dynamo as claimed in claim 5, characterized in that Each set of flow channels is connected end to end. Two adjacent sets of flow channels are the first-stage flow channel and the last-stage flow channel, respectively. The first-stage flow channel does not participate in the circulation of cooling liquid and has a first inlet / outlet liquid chamber and a second inlet / outlet liquid chamber that are not connected to each other. The last-stage flow channel has a third inlet / outlet liquid chamber. The second inlet / outlet liquid chamber is connected to the second-stage flow channel. The last-stage flow channel is connected to the third inlet / outlet liquid chamber. The third inlet / outlet liquid chamber is connected to the rear cooling chamber. The rear cooling chamber is connected to the first inlet / outlet liquid chamber.

7. A liquid-cooled dynamo as claimed in claim 1, characterized in that The motor housing is a cylindrical shape with one end open and the other end closed, and the rear end is closed. The inner wall of the closed end and the outer wall of the closed end of the motor cooling housing form a rear cooling cavity. The inner wall of the closed end is provided with a second guide rib, which makes the rear cooling cavity form a flow channel that is connected from end to end.

8. A liquid-cooled dynamo as claimed in claim 7, characterized in that The outer circumferential region of the motor housing is provided with a third liquid inlet / outlet and a fourth liquid inlet / outlet for external cooling liquid to enter / exit.

9. A liquid-cooled dynamo as claimed in claim 8, characterized in that The third inlet / outlet corresponds to and is connected to the first inlet / outlet chamber, the fourth inlet / outlet corresponds to and is connected to the second inlet / outlet chamber, and the two ends of the flow channel in the rear cooling chamber are connected to the first inlet / outlet chamber and the third inlet / outlet chamber, respectively.

10. A liquid-cooled dynamo as claimed in claim 1, characterized in that The motor cooling housing and the motor outer housing are coaxially sleeved, with the open end being the front end, which is connected to the front end cover, and the closed end being the rear end, which is provided with a cable outlet.

Images