Enclosed motor air guide system based on temperature difference enhanced power taking and heat dissipation

Abstract

The invention provides a closed motor air guide system based on temperature difference enhanced electricity taking and heat dissipation. The system comprises a rotary air guide unit, a temperature difference electricity taking and heat dissipation composite module, an energy storage and control module and a remote control / manual double-control system. According to the invention, efficient power taking and auxiliary heat dissipation are synchronously realized through a metal enhanced heat exchange structure integrated at the hot end of the thermoelectric power generation sheet; the flow guiding device is driven by the generated electric energy to rotate, fixed wind resistance is periodically eliminated, and the whole flow field is optimized. Complete energy autonomy is achieved, the heat dissipation effect of the motor is improved, active flow field optimization is achieved, the structure is simple, reliability is high, and the cooling performance and operation reliability of the closed motor are remarkably improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of motor thermal management, and particularly relates to a closed motor air guide system based on temperature difference reinforced power taking and heat dissipation. BACKGROUND

[0002] The internal thermal management of a closed motor, especially a medium-large high-voltage or high-power density motor applied to electric vehicle driving, industrial frequency conversion, wind power generation and the like, is a core challenge to determine the performance limit, operation efficiency and service life. The loss generated during motor operation will cause the temperature of the motor to rise. If the working temperature exceeds the maximum temperature allowed by the insulation material, the motor life will be shortened and the motor will be damaged; if the working temperature of the permanent magnet exceeds the maximum temperature allowed by the permanent magnet, the permanent magnet will be demagnetized, affecting the performance of the motor. Therefore, the motor must be cooled to keep the temperature rise of each component within the allowed range and ensure the safe and normal operation of the motor. Such a motor usually adopts an external cooling mode of a casing water cooling or air cooling, and relies on an internal fan coaxially installed with the rotor to drive air to circulate to transfer the heat generated by the stator winding, the iron core and the like to the casing for heat dissipation.

[0003] Most closed motors adopt a static and fixed internal air duct design. Such a "one-size-fits-all" design cannot respond to the dynamic changes and highly uneven thermal field distribution during motor operation. From the perspective of fluid mechanics, any obstacle (such as a wind guide plate support arm) placed in the flow field will generate a persistent wake, vortex street and low-speed area downstream. When the wind guide plate is fixed at a certain angle for a long time, these adverse flow structures are also fixed, forming a persistent "wind resistance shadow area" or "dead zone" locally, which hinders the diffusion of heat to the main flow area. This means that a device designed to improve local cooling may create new, fixed cooling weak areas around it due to the static structure. The prior art completely ignores this fluid level side effect.

[0004] On the other hand, thermoelectric conversion technology (thermoelectric generation) is widely studied for industrial waste heat recovery due to its simple structure, no moving parts and high reliability. In the field of motors, there have been studies on attaching thermoelectric generation sheets to the outer wall of the casing to recover the heat dissipated to the environment. However, such studies generally regard thermoelectric generation as an independent, passive energy collection module, and its goal is only to output electric energy. Its installation location (the outer wall of the casing) and functional setting are completely disconnected from the active and dynamic cooling needs inside the motor, and it fails to form a closed-loop system that solves its own problems with its own energy. How to organically combine this self-powered feature with intelligent wind field management is still a blank.

[0005] Therefore, there is an urgent need in the art for an innovative solution that should be able to: ① actively avoid or eliminate the fixed wind resistance effect introduced by its own structure; ② without relying on external complex power supply and control, with high reliability; ③ in an ideal case, it can use the energy generated by the motor itself (such as waste heat) to drive the above functions, realize true energy autonomy and system integration. The present application is proposed in this deep technical background. SUMMARY

[0006] The present application aims to overcome the shortcomings of the prior art, and provides a closed motor wind guide system based on temperature difference enhanced power taking and heat dissipation. The present application further enhances the heat taking structure of the hot end of the thermoelectric generator, and simultaneously improves the power generation efficiency and auxiliary heat dissipation capacity.

[0007] To achieve the above-mentioned purposes, the technical solution adopted by the present application is:

[0008] A closed motor wind guide system based on temperature difference enhanced power taking and heat dissipation, installed at the front end of the coaxial fan inside the motor, comprising a rotating wind guide unit, a temperature difference power taking and heat dissipation composite module, an energy storage and control module, and a manual control system:

[0009] The rotating wind guide unit comprises a wind shield arranged at the front end of the coaxial fan and connected to the machine shell, and a flow guide device in the shape of an arc-shaped horn and rotatable, connected to the wind shield through a rotating ring; the outer side of the flow guide device is provided with an outer gear ring, which forms an outer meshing transmission with a connecting shaft gear installed on the output shaft of the micro stepping motor; the micro stepping motor is installed on the end cover of the closed motor and is provided with electric energy and sent instructions by the energy storage and control module, driving the flow guide device to rotate;

[0010] The temperature difference power taking and heat dissipation composite module comprises a thermoelectric generator sheet and a metal reinforced heat exchange structure fixed to the hot end surface of the thermoelectric generator sheet; the cold end of the thermoelectric generator sheet is closely attached to the inner wall surface of the cooling water jacket of the closed motor; the hot end with the metal reinforced heat exchange structure is exposed to the hot air inside the closed motor; the temperature difference power taking and heat dissipation composite module converts heat energy into electric energy output;

[0011] The energy storage and control module includes a rectifier and voltage stabilizer circuit, a super capacitor and a timing control unit, for collecting, storing and managing the electric energy generated by the temperature difference power taking and heat dissipation composite module; the timing control unit is provided with a time relay, which triggers the micro stepping motor to drive the flow guide device to rotate at a set interval, and the time of each driving rotation is preset; a wireless remote control receiver is included for receiving external remote control signals and controlling the rotation of the flow guide device;

[0012] The manual control system includes a manual knob; it is directly connected to the micro stepping motor, realizing manual operation.

[0013] As a further improvement of the application, the flow guide device is used to change the flow direction of the main air path, the baffle of the flow guide device is connected with the shell, blocks the air path, and the cooled air is blown out after being accelerated by the fan, the flow guide device further comprises an upper guide plate and a lower guide plate, the upper guide plate and the lower guide plate are both curved arc type, combined together through the connecting plate, to form the flow guide device, so that the path of part of the cooling air blown by the fan is changed, and the part with the highest temperature in the motor, i.e. the winding end, is blown, so as to effectively reduce the temperature.

[0014] As a further improvement of the application, the extension direction of the metal scale array of the heat end with metal reinforced heat exchange structure is adapted to the main air flow direction in the motor, so as to reduce the flow resistance, not only can improve the power generation efficiency of the thermoelectric power generation device, but also can absorb the heat of the air in the motor, reduce the temperature, make the overall temperature in the cavity away from the fan side of the motor drop, so as to reduce the temperature of the winding end, and realize efficient heat collection and power generation and auxiliary heat dissipation.

[0015] As a further improvement of the application, the timing control unit sets the flow guide device to trigger driving action once every 20 minutes, and each time the flow guide device rotates 30°, and stops rotating automatically after reaching the position, so that the position of the flow guide device is kept stable.

[0016] As a further improvement of the application, the rotation of the flow guide device is completed by a micro stepping motor, and the output shaft is connected with the connecting gear and the outer gear ring to form an outer meshing transmission.

[0017] As a further improvement of the application, the rotating air guide unit changes the local streamline direction through the periodic rotation of the flow guide device, and promotes the displacement or dissipation of the wind resistance shadow area.

[0018] As a further improvement of the application, the energy storage and control module sets fixed rotation time and interval period, so as to avoid energy waste and mechanical fatigue caused by continuous operation.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] (1) The inherent temperature difference of the motor is used for power generation, so that the driving energy is completely self-sufficient. The newly added metal reinforced heat exchange structure is not only an efficient "energy collector", but also a direct "auxiliary radiator", which achieves the overturning effect of "driving heat with heat, power generation and heat dissipation cooperation", and significantly improves the comprehensive energy efficiency of the system.

[0021] (2) When a traditional air guide plate is fixed at a certain angle for a long time, a stable "wind resistance shadow area" or "airflow dead zone" will be formed downstream, which seriously hinders the diffusion of heat to the mainstream area. However, the present invention actively disturbs the boundary layer flow by periodically swinging at a small angle, breaking the stability of the original vortex structure, causing the dead zone to continuously migrate or disappear, thereby restoring the local convective heat transfer capacity and significantly improving the overall heat dissipation uniformity.

[0022] (3) On the basis of high autonomy, it retains complete remote control and manual intervention capabilities, enabling the system to adapt to various special working conditions and user customization needs, and has a wide range of applications.

[0023] (4) The rotation range of the air guide device is limited to 30° each time, which can effectively adjust the air path and avoid excessive swaying that affects the structural stability;

[0024] (5) Set a fixed drive time mechanism (e.g., 15 seconds each time, 20 minutes interval) to prevent frequent operation from increasing energy consumption and wear of components. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the flow guiding device drive;

[0026] Figure 2 This is a detailed drawing of the flow guiding device;

[0027] Figure 3 This is a schematic diagram showing the location of the temperature difference power extraction and heat dissipation composite module;

[0028] Figure 4 This is a detailed diagram of the temperature difference power extraction and heat dissipation composite module;

[0029] Figure 5 This is a schematic diagram showing the location of the energy storage and control module;

[0030] Figure 6 This is a diagram showing the position of the manual knob;

[0031] In the diagram, 1-lower guide plate; 2-upper guide plate; 3-rotating collar; 4-external gear ring; 5-coupling gear; 6-energy storage and control module; 7-connecting plate; 8-micro stepper motor; 9-end cover; 10-cooling water jacket; 11-temperature difference power extraction and heat dissipation composite module; 12-cold end; 13-hot end; 14-casing; 15-wind baffle; 16-manual knob. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the rotatable guide vane device of the present invention is installed at the front end of the coaxial fan of a high-power enclosed asynchronous motor. Combined with...Figure 2 As shown, the baffle plate 15 is connected to the housing 14, blocking the airflow and allowing the cooled air to be accelerated by the fan before being blown out. A rotating collar 3 connects the upper guide plate 2 and the baffle plate 15, allowing the airflow guiding device to rotate. The upper guide plate 2 and the lower guide plate 1 are combined together via a connecting plate 7 to form the airflow guiding device, changing the path of a portion of the cooling air blown out by the fan and directing it towards the hottest part of the motor—the winding end—effectively reducing the temperature. An external gear ring 4 is provided on the outer side of the upper guide plate 2, forming an external meshing transmission with the coupling gear 5, allowing the airflow guiding device to rotate under the drive of the coupling gear 5, which is controlled by a micro stepper motor 8 mounted on the end cover 9. When the airflow guiding device is stationary for a long time, its connecting plate 7 obstructs airflow, forming an "airflow dead zone," limiting heat dissipation at the winding end near the fan. However, under the periodic rotation of this invention, the flow field structure continuously changes, effectively preventing localized heat accumulation.

[0034] like Figure 3 , 4 As shown, the thermoelectric power generation and heat dissipation composite module 11 is distributed circumferentially on the inner wall of the motor cooling water jacket 10, away from the fan. Its cold end 12 is in close contact with the cooling water jacket 10 with water channels. With the continuous flow of cooling water, the temperature of the cold end is kept at a low temperature. The hot end faces the high-temperature air inside the motor cavity. On the side away from the fan, the air blown by it has a higher temperature due to convective heat exchange with the heat-generating components inside the motor. Multiple rows of copper heat-absorbing fins are welded on the hot end substrate, which greatly improves the heat exchange efficiency with the high-temperature airflow. Their extension direction is adapted to the direction of the dominant airflow inside the motor to reduce flow resistance. This not only improves the power generation efficiency of the thermoelectric power generation device, but also absorbs heat from the air inside the motor, reducing its temperature and lowering the overall temperature inside the motor cavity on the side away from the fan, thereby reducing the temperature of the winding ends.

[0035] like Figure 5 As shown, the power generated by the temperature difference power extraction and heat dissipation composite module 11 is transmitted to the energy storage and control module 6. After rectification and voltage regulation, the power is stored in the supercapacitor. The module also has a built-in microprocessor that controls and powers the micro stepper motor 8. The interval for starting the driver program is set to 20 minutes. The output pulse signal drives the micro stepper motor 8 to rotate forward, which in turn drives the coupling gear 5 to mesh with the external gear ring 4, causing the flow guiding device to rotate by a fixed angle of 30°.

[0036] Users can also remotely intervene in the operating mode using a handheld remote control, or use the location such as... during maintenance. Figure 6 The manual knob 16 shown adjusts the rotation of the flow guide device.

[0037] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A closed-loop motor airflow system based on temperature difference-enhanced power extraction and heat dissipation, installed at the front end of a coaxial fan inside the motor, characterized in that, It includes a rotary air guide unit, a thermoelectric power extraction and heat dissipation composite module (11), an energy storage and control module (6), and a manual control system: The rotating air guide unit includes a baffle plate (15) located at the front end of the coaxial fan and connected to the housing, and a rotatable air guide device in the shape of an arc trumpet connected to the baffle plate (15) via a rotating collar (3); an external gear ring (4) is provided on the outside of the air guide device, which forms an external meshing transmission with the coupling gear (5) installed on the output shaft of the micro stepper motor (8); the micro stepper motor (8) is installed on the end cover (9) of the enclosed motor and is powered and commanded by the energy storage and control module (6) to drive the air guide device to rotate; The thermoelectric power extraction and heat dissipation composite module (11) includes a thermoelectric generator and a metal-reinforced heat exchange structure fixed to the hot end surface of the thermoelectric generator; the cold end (12) of the thermoelectric generator is tightly attached to the inner wall of the cooling water jacket (10) of the enclosed motor; the hot end (13) with the metal-reinforced heat exchange structure is exposed to the hot air inside the enclosed motor; the thermoelectric power extraction and heat dissipation composite module (11) converts thermal energy into electrical energy output; The energy storage and control module (6) includes a rectifier and voltage regulator circuit, a supercapacitor and a timing control unit; the timing control unit has a built-in time relay, sets an interval period to trigger the micro stepper motor (8) to drive the flow guiding device to rotate, and presets the time for each drive rotation; Includes a wireless remote control receiver for receiving external remote control signals and controlling the rotation of the flow guiding device; The manual control system includes a manual knob (16) that is directly connected to the micro stepper motor to enable manual operation.

2. The enclosed motor airflow system based on temperature difference-enhanced power extraction and heat dissipation according to claim 1, characterized in that, The baffle plate (15) of the flow guiding device is connected to the housing (14). The flow guiding device also includes an upper flow guiding plate (2) and a lower flow guiding plate (1). The upper flow guiding plate (2) and the lower flow guiding plate (1) are both curved arc shapes and are combined together by a connecting plate (7) to form the flow guiding device.

3. The enclosed motor airflow system based on temperature difference-enhanced power extraction and heat dissipation as described in claim 1, characterized in that, The extension direction of the metal scale array of the hot end (13) with the metal-reinforced heat exchange structure is adapted to the direction of the dominant airflow inside the closed motor.

4. The enclosed motor ventilation system based on temperature difference-enhanced power extraction and heat dissipation according to claim 1, characterized in that, The timing control unit is set to trigger a driving action of the flow guiding device every 20 minutes, driving the flow guiding device to rotate 30° each time, and automatically stopping the rotation after reaching the position, so that the flow guiding device maintains a stable position.

5. A closed-loop motor ventilation system based on temperature difference-enhanced power extraction and heat dissipation as described in claim 1, characterized in that, The energy storage and control module is set with a fixed rotation time and interval period.

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