Liquid cooling heat dissipation structure of axial magnetic flux motor stator core

Abstract

The invention provides a liquid cooling heat dissipation structure of an axial flux motor stator core, which comprises two casings, the two casings are internally provided with stator cores, and the stator cores are externally provided with liquid cooling assemblies; the liquid cooling assembly comprises a heat conducting seat, a groove, an inner heat exchange tube, an outer heat exchange tube, a heat conducting sheet, a circulating pump and a heat exchange cover; the heat conduction seat is fixedly connected to the inner side wall of the machine shell. The circulating pump is arranged, under conveying of the circulating pump, cooling liquid circularly flows in the inner heat exchange pipe and the outer heat exchange pipe, the cooling liquid in the inner heat exchange pipe absorbs internal heat of the stator iron core, compared with the prior art, the liquid cooling assembly is arranged outside the stator iron core, liquid cooling heat dissipation of the stator iron core can be achieved, and the cooling efficiency of the stator iron core is improved. Through liquid cooling heat dissipation, the temperature of the stator iron core can be effectively reduced, the stator iron core is maintained in a low working temperature range, and the problems of performance reduction and service life shortening caused by high temperature are reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a liquid cooling heat dissipation structure, in particular to a liquid cooling heat dissipation structure of an axial flux motor stator core, and belongs to the technical field of axial flux motors. BACKGROUND

[0002] An axial flux motor is a special type of motor whose magnetic flux direction is distributed along the axial direction of the motor, which is different from the traditional radial flux motor (magnetic flux direction is radial). It has some unique advantages, such as high power density, compact structure and good torque characteristics, so it has been widely used in some specific fields, such as new energy vehicles, aerospace, robots, etc. The stator core of the axial flux motor is usually made of silicon steel sheets to reduce eddy current loss. These silicon steel sheets have slots for placing the stator winding. The shape and size of the stator core are determined according to the specific design requirements of the motor, generally in the form of a disc or a ring to adapt to the distribution of the axial magnetic flux. The stator core is an important part of the magnetic circuit of the motor, which provides a closed path for the magnetic flux, and is also the support structure of the stator winding. During the operation of the motor, the stator core interacts with the rotor to generate electromagnetic force, thereby driving the rotor to rotate and realizing the conversion of electrical energy and mechanical energy.

[0003] During the operation of the motor, the magnetic field in the stator core changes over time, and the core material generates energy loss due to the flipping and friction of magnetic domains during repeated magnetization and demagnetization. This part of the loss is converted into heat, causing the core to heat up. The increase in temperature will change the permeability of the stator core, causing the magnetic field distribution of the motor to be uneven, which will affect the electromagnetic torque output of the motor. In the research and application field of axial flux motors, the heat dissipation technology of the stator core is a key link to ensure the efficient and stable operation of the motor. In the prior art, the heat dissipation method of the stator core is mainly air cooling. This method mainly uses the installation of a cooling fan to utilize the principle of forced convection to blow air through the surface of the stator core to carry away the heat generated by the core. Although this method can achieve the purpose of heat dissipation to some extent, its heat dissipation effect has significant limitations in practical application. On the one hand, the thermal conductivity of air is low, and it is difficult to quickly and massively absorb and carry away the heat of the stator core; on the other hand, air cooling is easily affected by environmental factors, and in harsh environments such as high temperature and dust, the heat dissipation efficiency will further decrease. As the axial flux motor develops towards high power and high speed, the heat generated by the stator core increases, and air cooling has been difficult to meet the heat dissipation needs of the motor. Therefore, a liquid cooling heat dissipation structure for the stator core of an axial flux motor is proposed. SUMMARY

[0004] Therefore, the axial flux motor stator core liquid cooling heat dissipation structure is provided to solve or alleviate the technical problems in the prior art and at least provide an advantageous option.

[0005] The technical scheme of the embodiment of the present application is as follows: an axial flux motor stator core liquid cooling heat dissipation structure, comprising two machine housings, the interiors of the two machine housings are provided with stator cores, and the exteriors of the stator cores are provided with liquid cooling assemblies; The liquid cooling assembly comprises a heat conduction seat, a groove, an inner heat exchange pipe, an outer heat exchange pipe, a heat conduction sheet, a circulating pump and a heat exchange cover. The heat conduction seat is fixedly connected to the inner side wall of the machine housing, the groove is formed in the outer side wall of the heat conduction seat, the outer side wall of the stator core is attached to the inner side wall of the groove and is fixedly connected to the heat conduction seat through bolts, the inner heat exchange pipe is embedded in the interior of the heat conduction seat, the outer heat exchange pipe is fixedly connected to the interior of the heat exchange cover, the heat conduction sheets are uniformly fixedly connected to the outer side wall of the outer heat exchange pipe, the circulating pump is installed on the outer side wall of the machine housing, one end of the inner heat exchange pipe is in communication with one end of the outer heat exchange pipe, and the other end of the inner heat exchange pipe is in communication with the other end of the outer heat exchange pipe through the circulating pump.

[0006] Further preferably, the liquid cooling assembly further comprises a rotor shaft, a flow guide fan, an air outlet hole and an air inlet hole. The flow guide fan is symmetrically installed on the outer side wall of the rotor shaft, and the air outlet hole and the air inlet hole are respectively formed in the inner side wall and the outer side wall of the heat exchange cover.

[0007] Further preferably, the position of the flow guide fan corresponds to the position of the heat exchange cover, the flow guide fan is located in the interior of the heat exchange cover, and the heat exchange cover is fixedly connected to the outer side wall of the machine housing.

[0008] Further preferably, the outer side wall of the rotor shaft is fixedly connected with a rotor disc in the middle, the outer side wall of the rotor disc is symmetrically fixedly connected with magnetic steels, and the interior of the stator core is wound with a stator winding.

[0009] Further preferably, the rotor disc is located between the two stator cores, the interior of the machine housing is provided with a connecting bolt, the two machine housings are fixedly connected through the connecting bolt, and the rotor shaft is rotatably connected to the interior of the machine housing through a bearing.

[0010] Further preferably, the exterior of the heat exchange cover is provided with a dustproof assembly, and the dustproof assembly comprises a mounting seat, a dustproof net, a positioning hole, a limiting column, two rotating rings and a cleaning brush. The positioning hole is symmetrically arranged in the inner part of the mounting seat, the limiting plug post is symmetrically fixedly connected to the outer side wall of the heat exchange cover, the dustproof net is fixedly connected to the outer side wall of the mounting seat, and the cleaning brush is fixedly connected to the opposite surfaces of the two rotating rings.

[0011] Further preferably, the mounting seat is attached to the outer side wall of the heat exchange cover, the limiting plug post is inserted into the inner part of the positioning hole, and the outer side wall of the limiting plug post is threadedly connected with a nut, and the nut is attached to the outer side wall of the mounting seat.

[0012] Further preferably, the position of the dustproof net corresponds to the position of the air inlet hole.

[0013] Further preferably, the two rotating rings are both rotationally connected to the outer side wall of the mounting seat, and the bristle end of the cleaning brush is attached to the outer side wall of the dustproof net.

[0014] Further preferably, one of the rotating rings is fixedly connected with a driving ring on the side away from the cleaning brush.

[0015] The embodiment of the present application has the following advantages due to the adoption of the above technical solutions. Firstly, the present application sets a circulating pump, under the delivery of the circulating pump, the cooling liquid circulates in the inner part of the inner heat exchange pipe and the inner part of the outer heat exchange pipe, the cooling liquid of the inner heat exchange pipe absorbs the inner heat of the stator core, then flows into the outer heat exchange pipe, the outer heat exchange pipe exchanges heat with air, at the same time, the rotor shaft drives the guide fan to rotate, at this time, under the action of the guide fan, the external air flows into the heat exchange cover from the air inlet hole, exchanges heat with the outer heat exchange pipe, reduces the temperature of the cooling liquid in the outer heat exchange pipe, and then is discharged from the air outlet hole, thereby ensuring the heat dissipation effect of the stator core.

[0016] Secondly, the dustproof net can filter the air entering the heat exchange cover, filter out the dust impurities in the air, and avoid the dust impurities adhering to the outer heat exchange pipe after entering the heat exchange cover to affect the cooling effect of the circulating liquid; when the axial flux motor runs for a period of time, the dustproof net is cleaned, at this time, the axial flux motor is controlled to reverse, the rotor shaft drives the guide fan to reverse, at this time, the external air flows into the heat exchange cover from the air outlet hole, and then is discharged from the air inlet hole, the driving ring is rotated, the driving ring drives the rotating ring to rotate, the rotating ring drives the cleaning brush, the cleaning brush cleans the dust impurities on the dustproof net, and then falls off under the blowing of the airflow, thereby realizing the cleaning of the dustproof net.

[0017] The above summary is intended to illustrate the present application and is not intended to be limiting thereof. Further aspects, embodiments and features of the present application will become apparent from the detailed description in conjunction with the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Figure 1 Structure diagram of the liquid cooling heat dissipation structure of the stator core of the axial flux motor of the present application; Figure 2 Structure exploded view of the present application; Figure 3 Schematic structure diagram of the liquid cooling assembly installation position of the present application; Figure 4 Structure exploded view of the liquid cooling assembly of the present application; Figure 5 Connection schematic diagram of the inner heat exchange pipe and the outer heat exchange pipe of the present application; Figure 6 Schematic diagram of the dustproof assembly installation position of the present application; Figure 7 Structure exploded view of the dustproof assembly of the present application; Figure 8 Structure diagram of the driving ring of the present application.

[0020] Reference signs: 101, liquid cooling assembly; 11, machine shell; 12, stator core; 13, stator winding; 14, heat conduction seat; 15, groove; 16, inner heat exchange pipe; 17, outer heat exchange pipe; 18, heat conduction sheet; 19, circulating pump; 20, heat exchange cover; 21, exhaust hole; 22, air inlet hole; 23, rotor shaft; 24, guide fan; 25, magnetic steel; 26, rotor disc; 27, connecting bolt; 301, dustproof assembly; 31, mounting seat; 32, dustproof screen; 33, nut; 34, positioning hole; 35, limiting column; 36, rotating ring; 37, driving ring; 38, cleaning brush. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0022] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0023] In the prior art, the heat dissipation mode of the stator core is mainly air cooling. This mode mainly uses the forced convection principle to blow air through the surface of the stator core to take away the heat generated by the stator core by installing a cooling fan. Although this mode can achieve the purpose of heat dissipation to some extent, its heat dissipation effect has significant limitations in actual application. On the one hand, the thermal conductivity of air is low, and it is difficult to quickly and massively absorb and take away the heat of the stator core; on the other hand, air cooling is easily affected by environmental factors, and in harsh environments such as high temperature and dust, the heat dissipation efficiency will further decrease. With the development of axial flux motors towards high power and high speed, the heat generated by the stator core is increasing, and air cooling has been difficult to meet the heat dissipation needs of the motor. For this purpose, please refer to Figures 1-8 The embodiment of the present application provides a liquid cooling heat dissipation structure of an axial flux motor stator core, which comprises two machine housings 11, the interiors of the two machine housings 11 are provided with stator cores 12, the exteriors of the stator cores 12 are provided with liquid cooling assemblies 101, the liquid cooling assemblies 101 can realize liquid cooling heat dissipation of the stator cores 12, the liquid cooling heat dissipation can more effectively reduce the temperature of the stator cores 12, maintain them in a lower working temperature range, and reduce the problems of performance decline and service life shortening caused by high temperature; The liquid cooling assembly 101 comprises a heat conduction seat 14, a groove 15, an inner heat exchange pipe 16, an outer heat exchange pipe 17, a heat conduction sheet 18, a circulating pump 19 and a heat exchange cover 20; The heat conduction seat 14 is fixedly connected to the inner side wall of the machine housing 11, the groove 15 is formed in the outer side wall of the heat conduction seat 14, the outer side wall of the stator core 12 is attached to the inner side wall of the groove 15 and is fixedly connected to the heat conduction seat 14 through bolts, the position of the stator core 12 can be limited through the groove 15, and the bolt connection mode facilitates later disassembly and maintenance. The heat conduction seat 14 is made of copper and has good heat conduction effect. The contact surface of the heat conduction seat 14 and the stator core 12 is coated with heat-conducting silicone grease to ensure the heat transfer efficiency; The inner heat exchange pipe 16 is embedded in the interior of the heat conduction seat 14, the heat conduction seat 14 can absorb the heat in the stator core 12, the cooling liquid in the inner heat exchange pipe 16 can absorb the heat in the heat conduction seat 14, and thus the heat dissipation of the stator core 12 is realized; The inner heat exchange pipe 16 and the outer heat exchange pipe 17 are both provided with cooling liquid; The outer heat exchange pipe 17 is fixedly connected to the inside of the heat exchange cover 20, the heat conduction fins 18 are uniformly fixedly connected to the outer side wall of the outer heat exchange pipe 17, the circulating pump 19 is installed on the outer side wall of the casing 11, one end of the inner heat exchange pipe 16 is communicated with one end of the outer heat exchange pipe 17, the other end of the inner heat exchange pipe 16 is communicated with the other end of the outer heat exchange pipe 17 through the circulating pump 19, under the conveying of the circulating pump 19, the cooling liquid circulates in the inside of the inner heat exchange pipe 16 and the inside of the outer heat exchange pipe 17, the cooling liquid of the inner heat exchange pipe 16 absorbs the inner heat of the stator core 12, and then flows into the outer heat exchange pipe 17, the outer heat exchange pipe 17 exchanges heat with air, so that the cooling liquid is cooled and radiated, and the contact area of the outer heat exchange pipe 17 and the air can be increased through the heat conduction fins 18, so that the heat dissipation effect is improved.

[0024] In one embodiment, the liquid cooling assembly 101 further comprises a rotor shaft 23, a guide fan 24, an exhaust hole 21 and an air inlet hole 22; The guide fan 24 is symmetrically installed on the outer side wall of the rotor shaft 23, the exhaust hole 21 and the air inlet hole 22 are respectively arranged on the inner side wall and the outer side wall of the heat exchange cover 20, and the heat exchange cover 20 can be communicated with the external air through the exhaust hole 21 and the air inlet hole 22; The position of the guide fan 24 corresponds to the position of the heat exchange cover 20, the guide fan 24 is located in the inside of the heat exchange cover 20, and the heat exchange cover 20 is fixedly connected to the outer side wall of the casing 11, when the axial flux motor works, the rotor shaft 23 drives the guide fan 24 to rotate, at this time, under the action of the guide fan 24, the external air flows into the heat exchange cover 20 from the air inlet hole 22, the air exchanges heat with the outer heat exchange pipe 17, the temperature of the cooling liquid in the outer heat exchange pipe 17 is reduced, and then the air is discharged from the exhaust hole 21, so that the heat dissipation effect of the stator core 12 is ensured.

[0025] In one embodiment, the outer side wall of the rotor shaft 23 is fixedly connected with a rotor disc 26, the outer side wall of the rotor disc 26 is symmetrically fixedly connected with a magnetic steel 25, the inside of the stator core 12 is wound with a stator winding 13, and the rotor disc 26 is located between the two stator cores 12, so that the rotor shaft 23, the rotor disc 26 and the magnetic steel 25 can form a rotor structure of the axial flux motor; The inside of the casing 11 is provided with a connecting bolt 27, the two casings 11 are fixedly connected through the connecting bolt 27, the rotor shaft 23 is rotatably connected to the inside of the casing 11 through a bearing, the stator winding 13 on the stator core 12 is electrified, at this time, the current passes through the stator winding 13 and generates a magnetic field, the magnetic field interacts with the magnetic steel 25, so as to drive the rotor shaft 23 to rotate, and the electrical energy is converted into mechanical energy.

[0026] In order to solve the problems in the prior art, the embodiment of the present application provides a liquid cooling heat dissipation structure of an axial flux motor stator core, and the above technical scheme realizes the solution of the problems: When the axial flux motor works, the circulating pump 19 works simultaneously, under the delivery of the circulating pump 19, the cooling liquid circulates in the inside of the inner heat exchange pipe 16 and the inside of the outer heat exchange pipe 17, the cooling liquid of the inner heat exchange pipe 16 absorbs the inner heat of the stator core 12, and then flows into the outer heat exchange pipe 17, the outer heat exchange pipe 17 exchanges heat with air, at the same time, the rotor shaft 23 drives the guide fan 24 to rotate, at this time, under the action of the guide fan 24, the external air flows into the heat exchange cover 20 from the air inlet hole 22, the air exchanges heat with the outer heat exchange pipe 17, reduces the temperature of the cooling liquid in the outer heat exchange pipe 17, and then is discharged from the air outlet hole 21, thereby ensuring the heat dissipation effect of the stator core 12, relative to the prior art, the liquid cooling assembly 101 is arranged outside the stator core 12, liquid cooling heat dissipation of the stator core 12 can be realized, the temperature of the stator core 12 can be more effectively reduced through liquid cooling heat dissipation, the stator core 12 is maintained in a lower working temperature range, and the problems of performance reduction and service life shortening caused by high temperature are reduced.

[0027] In one embodiment, the heat exchange cover 20 is provided with a dustproof assembly 301, the dustproof assembly 301 comprises a mounting seat 31, a dust screen 32, a positioning hole 34, a limiting plug column 35, two rotating rings 36 and a cleaning brush 38. The positioning hole 34 is symmetrically arranged in the inside of the mounting seat 31, the limiting plug column 35 is fixedly connected to the outer side wall of the heat exchange cover 20, the mounting seat 31 is attached to the outer side wall of the heat exchange cover 20, the limiting plug column 35 is inserted into the inside of the positioning hole 34, and the outer side wall of the limiting plug column 35 is threadedly connected with a nut 33, and the nut 33 is attached to the outer side wall of the mounting seat 31, the position of the mounting seat 31 can be positioned through cooperation of the limiting plug column 35 and the positioning hole 34, so that the dustproof assembly 301 is installed on the heat exchange cover 20, and the mounting seat 31 is attached to the outer side wall of the heat exchange cover 20. The dust screen 32 is fixedly connected to the outer side wall of the mounting seat 31, the position of the dust screen 32 corresponds to the position of the air inlet hole 22, when the rotor shaft 23 drives the guide fan 24 to rotate, the external air flows into the heat exchange cover 20 from the air inlet hole 22, and then the air entering the heat exchange cover 20 can be filtered through the dust screen 32, so that dust and impurities in the air are filtered out, and the dust and impurities adhered to the outer heat exchange pipe 17 after entering the heat exchange cover 20 are prevented from affecting the cooling effect of the circulating liquid.

[0028] In one embodiment, the cleaning brush 38 is fixedly connected to the opposite sides of the two rotating rings 36, both of which are rotationally connected to the outer side wall of the mounting seat 31, and the bristle end of the cleaning brush 38 is attached to the outer side wall of the dust screen 32. One rotating ring 36 is fixedly connected with the driving ring 37 away from the cleaning brush 38. When the axial flux motor operates for a period of time, the dust screen 32 needs to be cleaned. At this time, the axial flux motor is controlled to reverse, the rotor shaft 23 drives the guide fan 24 to reverse, at this time, the external air flows into the heat exchanger cover 20 from the exhaust hole 21, and then flows out from the air inlet hole 22. The driving ring 37 is rotated, the rotating ring 36 drives the cleaning brush 38, and the cleaning brush 38 cleans the dust and impurities on the dust screen 32, and then falls off under the blowing of the airflow, thereby realizing the cleaning of the dust screen 32.

[0029] In one embodiment, the temperature sensor (not shown in the figure) is arranged inside the heat-conducting seat 14, and the flow rate sensors (not shown in the figure) are arranged inside the inner heat exchange pipe 16 and the outer heat exchange pipe 17. The temperature sensor monitors the working temperature of the stator core 12 in real time and feeds back to the control system of the axial flux motor. The control system controls the working efficiency of the circulating pump 19 in real time through the temperature control algorithm, and further controls the flow rate of the cooling liquid in the inner heat exchange pipe 16 and the outer heat exchange pipe 17. During the operation of the axial flux motor, the temperature control of the stator core 12 is crucial. Excessive temperature can cause the motor performance to decline, the insulation material to age or even be damaged, and seriously affect the service life and reliability of the motor. Through real-time monitoring of the temperature sensor and the flow rate sensor, combined with the temperature control algorithm, the working efficiency of the circulating pump 19 is accurately controlled, thereby effectively adjusting the flow rate of the cooling liquid in the inner heat exchange pipe 16 and the outer heat exchange pipe 17, and ensuring that the stator core 12 always works in an appropriate temperature range. The temperature control algorithm includes the following steps: Sensor calibration Before the algorithm starts to run, the temperature sensor and the flow rate sensor are calibrated. The temperature sensor needs to ensure that the error between its measurement value and the actual temperature is within the allowable range, so as to provide accurate stator core working temperature data. The flow rate sensor needs to be calibrated to ensure that it can accurately reflect the flow rate of the cooling liquid in the inner heat exchange pipe 16 and the outer heat exchange pipe 17. A standard temperature source and a liquid with a known flow rate are used for calibration. The temperature sensor is placed in the standard temperature source, the sensor output value is recorded, and the sensor is compared with the standard temperature. The calibration parameters of the sensor are adjusted until the measurement error meets the requirements. For the flow rate sensor, an experimental device with precise flow rate control is used. The sensor is installed in the device, the flow rate is adjusted, and the sensor output is recorded to complete the calibration process. I. Parameter setting The target operating temperature range of the stator core 12 is set, which is determined according to the design requirements of the motor, the temperature resistance of the insulation material, and the actual operating conditions, etc. For example, the upper limit of the target temperature can be set to a temperature value at which the motor can safely operate and its performance is not significantly affected, and the lower limit can be reasonably set according to the cooling efficiency and economy; The initial value and adjustment range of the circulating pump 19 operating efficiency are determined. The initial value can be set according to experience or experimental data to ensure that the cooling system can provide basic cooling capacity at startup. The adjustment range takes into account the performance limits of the circulating pump 19 and the stability of the system to avoid damage to the circulating pump 19 or unstable operation of the system due to excessive adjustment; The sampling period of the temperature control algorithm is set. The selection of the sampling period needs to consider the response speed and control accuracy of the system. A shorter sampling period can improve the response speed of the system, but it will increase the computational burden of the control system. A longer sampling period may cause the system to respond laggingly and fail to adjust the cooling fluid flow rate in time. According to the actual situation, a suitable sampling period is determined through experiments and optimization; II. Data acquisition Temperature data acquisition According to the set sampling period, the temperature sensor collects the operating temperature data of the stator core 12 in real time. At each sampling time, the temperature sensor converts the measured temperature value into an electrical signal and transmits it to the control system of the axial flux motor; The control system pre-processes the collected temperature data, including filtering to eliminate the influence of sensor noise and random interference on the data. The filtering methods include moving average filtering and median filtering. Through filtering, more stable and accurate temperature values are obtained, providing a reliable basis for subsequent control decisions; Flow rate data acquisition At the same time, the flow rate sensor monitors the flow speed of the cooling fluid in the inner heat exchange pipe 16 and the outer heat exchange pipe 17 in real time. The flow rate sensor converts the flow rate information into corresponding electrical signals and sends them to the control system; The control system performs the same pre-processing operation on the flow rate data to remove noise and outliers, ensuring the accuracy of the flow rate data. In addition, statistical analysis can be performed on the flow rate data to calculate parameters such as average flow rate, maximum flow rate, and minimum flow rate, to better understand the flow state of the cooling fluid; III. Temperature analysis Temperature deviation calculation The control system compares the actual temperature value collected with the set target temperature range to calculate the temperature deviation, which reflects the difference between the current stator core temperature and the target temperature; If the actual temperature is higher than the upper target temperature limit, the temperature deviation is positive, indicating that the motor is in an overheated state, and the flow rate of the coolant needs to be increased to enhance the cooling effect; if the actual temperature is lower than the lower target temperature limit, the temperature deviation is negative, indicating that the cooling is excessive, and the flow rate of the coolant can be appropriately reduced to save energy; Temperature trend analysis In addition to calculating the temperature deviation, the control system also analyzes the temperature trend by comparing the temperature value at the current sampling time with the temperature values at the previous sampling times to determine whether the temperature is rising, falling, or remaining stable; If the temperature continues to rise, it indicates that the current cooling capacity may be insufficient, and measures need to be taken to increase the flow rate of the coolant in advance; if the temperature continues to fall, it can be considered to appropriately reduce the flow rate of the coolant to avoid excessive cooling. Temperature trend analysis helps improve the foresight and response speed of the control system and better cope with dynamic changes in temperature.

[0030] Four, control decision Determine the adjustment direction of the circulating pump 19 working efficiency According to the analysis results of the temperature deviation and the temperature trend, the control system determines the adjustment direction of the circulating pump 19 working efficiency. If the temperature deviation is positive and the temperature is rising, it is decided to increase the working efficiency of the circulating pump 19 to increase the flow rate of the coolant; if the temperature deviation is negative and the temperature is falling, it is decided to reduce the working efficiency of the circulating pump 19; When determining the adjustment direction, the stability and anti-interference ability of the system also need to be considered. Avoiding system oscillation or instability caused by frequent adjustment of the circulating pump 19 working efficiency, for example, a certain threshold can be set, and only when the temperature deviation exceeds the threshold or the temperature trend is obvious, the adjustment of the circulating pump 19 working efficiency can be carried out; Determine the adjustment amplitude After determining the adjustment direction, the control system needs to further determine the adjustment amplitude of the circulating pump 19 working efficiency. The size of the adjustment amplitude should be determined according to the size of the temperature deviation and the severity of the temperature trend; For larger temperature deviations or sharp temperature trends, a larger adjustment amplitude should be selected to quickly bring the temperature back to the target range; for smaller temperature deviations or slow temperature trends, a smaller adjustment amplitude is selected to achieve smooth regulation and avoid overshoot of the system. The adjustment amplitude can be determined by establishing a mapping relationship between the temperature deviation, the temperature trend, and the adjustment amplitude or fuzzy control rules; Five, circulating pump 19 control Command generation The control system generates corresponding circulating pump 19 control instructions according to the determined control decision, and the control instructions include the circulating pump 19 efficiency set value, which will determine the circulating pump 19 output power and the cooling liquid flow speed; When generating control instructions, ensure the accuracy and timeliness of the instructions. The instructions should be clearly communicated to the driving device of the circulating pump 19 so that the driving device can adjust the working state of the circulating pump 19 according to the set requirements; Instruction execution and feedback After receiving the control instructions, the driving device of the circulating pump 19 performs corresponding operations to adjust the working efficiency of the circulating pump 19. During the adjustment process, the driving device monitors the actual working state of the circulating pump 19 in real time and sends feedback information to the control system; The control system determines whether the circulating pump 19 has adjusted to the set working efficiency according to the feedback information; if there is a deviation, the control system will further adjust the control instructions until the actual working efficiency of the circulating pump 19 meets the set value; this closed-loop control method can improve the control accuracy and stability of the system; Six, system monitoring and optimization Operation state monitoring During the entire control process, the control system continuously monitors the operation state of the axial flux motor, including the temperature of the stator core, the flow rate of the cooling liquid, the working efficiency of the circulating pump 19, and other parameters. Through real-time monitoring, abnormal situations that may occur in the system are discovered in a timely manner, such as sensor failure, circulating pump 19 abnormality, etc.

[0031] When abnormal situations are detected, the control system should immediately take corresponding measures, such as issuing alarm signals, stopping the circulating pump 19 from running, etc., to protect the safety of the motor. At the same time, record the time of abnormal occurrence, parameter changes, etc. for subsequent fault analysis and processing.

[0032] Control algorithm optimization Optimize the temperature control algorithm periodically, analyze the performance of the control algorithm in terms of temperature control accuracy, response speed, stability, etc. based on actual operation data and experience feedback, and find out the problems and shortcomings; According to the problems found, adjust and improve the parameters, rules or structure of the control algorithm, such as optimize the mapping relationship between temperature deviation and temperature change trend and circulating pump 19 working efficiency adjustment amplitude, improve the adaptability and accuracy of the control algorithm, and through continuous optimization, the temperature control algorithm can better meet the actual operation requirements of the axial flux motor.

[0033] In work, the stator winding 13 on the given sub-iron core 12 is electrified, at this time the current passes through the stator winding 13 and generates a magnetic field, which interacts with the magnetic steel 25, thereby driving the rotor shaft 23 to rotate, the circulating pump 19 works at the same time, under the delivery of the circulating pump 19, the cooling liquid circulates in the inside of the inner heat exchange pipe 16 and the inside of the outer heat exchange pipe 17, the cooling liquid of the inner heat exchange pipe 16 absorbs the inner heat of the stator iron core 12, and then flows into the outer heat exchange pipe 17, the outer heat exchange pipe 17 exchanges heat with air, at the same time, the rotor shaft 23 drives the guide fan 24 to rotate, at this time, under the action of the guide fan 24, the external air flows into the heat exchange cover 20 from the air inlet hole 22, exchanges heat with the outer heat exchange pipe 17, reduces the temperature of the cooling liquid in the outer heat exchange pipe 17, and then is discharged from the air outlet hole 21, when the external air flows into the heat exchange cover 20 from the air inlet hole 22, the dust screen 32 can filter the air entering the heat exchange cover 20, filter out the dust impurities in the air, avoid the dust impurities adhering to the outer heat exchange pipe 17 after entering the heat exchange cover 20 to affect the cooling effect of the circulating liquid; when the axial flux motor runs for a period of time, the dust screen 32 is cleaned, at this time, the axial flux motor is controlled to reverse, the rotor shaft 23 drives the guide fan 24 to reverse, at this time, the external air flows into the heat exchange cover 20 from the air outlet hole 21, and then is discharged from the air inlet hole 22, the driving ring 37 is rotated, the driving ring 37 drives the rotating ring 36 to rotate, the rotating ring 36 drives the cleaning brush 38, the cleaning brush 38 cleans the dust impurities on the dust screen 32, and then falls off under the blowing of the airflow, so that the dust screen 32 is cleaned. Compared with the prior art, the liquid cooling assembly 101 is arranged outside the stator iron core 12, which can realize liquid cooling and heat dissipation of the stator iron core 12, and the temperature of the stator iron core 12 can be more effectively reduced through liquid cooling and heat dissipation, so that the stator iron core 12 is maintained in a lower working temperature range, and the problems of performance decline and service life shortening caused by high temperature are reduced.

[0034] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of various changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A liquid cooling heat dissipation structure of an axial flux motor stator core, comprising two machine housings (11), characterized in that: The interiors of the two machine housings (11) are each provided with a stator core (12), and the exterior of the stator core (12) is provided with a liquid cooling assembly (101); The liquid cooling assembly (101) comprises a heat-conducting seat (14), a groove (15), an inner heat exchange pipe (16), an outer heat exchange pipe (17), a heat-conducting sheet (18), a circulating pump (19) and a heat exchange cover (20); The heat-conducting seat (14) is fixedly connected to the inner side wall of the machine housing (11), the groove (15) is formed in the outer side wall of the heat-conducting seat (14), the outer side wall of the stator core (12) is attached to the inner side wall of the groove (15) and is fixedly connected to the heat-conducting seat (14) through bolts, the inner heat exchange pipe (16) is embedded in the interior of the heat-conducting seat (14), the outer heat exchange pipe (17) is fixedly connected to the interior of the heat exchange cover (20), the heat-conducting sheet (18) is fixedly connected to the outer side wall of the outer heat exchange pipe (17), the circulating pump (19) is installed on the outer side wall of the machine housing (11), one end of the inner heat exchange pipe (16) is in communication with one end of the outer heat exchange pipe (17), and the other end of the inner heat exchange pipe (16) is in communication with the other end of the outer heat exchange pipe (17) through the circulating pump (19).

2. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 1, characterized in that: The liquid cooling assembly (101) further comprises a rotor shaft (23), a flow guide fan (24), an air outlet hole (21) and an air inlet hole (22); The flow guide fan (24) is symmetrically installed on the outer side wall of the rotor shaft (23), and the air outlet hole (21) and the air inlet hole (22) are respectively formed in the inner side wall and the outer side wall of the heat exchange cover (20).

3. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 2, characterized in that: The position of the flow guide fan (24) corresponds to the position of the heat exchange cover (20), the flow guide fan (24) is located in the interior of the heat exchange cover (20), and the heat exchange cover (20) is fixedly connected to the outer side wall of the machine housing (11).

4. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 3, characterized in that: The outer side wall of the rotor shaft (23) is fixedly connected with a rotor disc (26) in the middle, the outer side wall of the rotor disc (26) is symmetrically fixedly connected with a magnetic steel (25), and the interior of the stator core (12) is wound with a stator winding (13).

5. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 4, characterized in that: The rotor disc (26) is located between the two stator cores (12), the interior of the machine housing (11) is provided with a connecting bolt (27), the two machine housings (11) are fixedly connected through the connecting bolt (27), and the rotor shaft (23) is rotatably connected to the interior of the machine housing (11) through a bearing.

6. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 2, characterized in that: The exterior of the heat exchange cover (20) is provided with a dustproof assembly (301), and the dustproof assembly (301) comprises a mounting seat (31), a dustproof net (32), a positioning hole (34), a limiting insertion column (35), two rotating rings (36) and a cleaning brush (38); The positioning hole (34) is symmetrically formed in the interior of the mounting seat (31), the limiting insertion column (35) is symmetrically fixedly connected to the outer side wall of the heat exchange cover (20), the dustproof net (32) is fixedly connected to the outer side wall of the mounting seat (31), and the cleaning brush (38) is fixedly connected to the opposite faces of the two rotating rings (36).

7. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 6, characterized in that: The mounting base (31) is attached to the outer side wall of the heat exchange cover (20), the limiting insertion column (35) is inserted into the inside of the positioning hole (34), the outer side wall of the limiting insertion column (35) is threadedly connected with a nut (33), and the nut (33) is attached to the outer side wall of the mounting base (31).

8. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 6, characterized in that: The position of the dustproof net (32) corresponds to the position of the air inlet hole (22).

9. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 6, characterized in that: Both of the two rotating rings (36) are rotationally connected to the outer side wall of the mounting base (31), and the bristle end of the cleaning brush (38) is attached to the outer side wall of the dustproof net (32).

10. The liquid cooling heat dissipation structure of an axial flux motor stator core according to claim 9, characterized in that: One of the rotating rings (36) is fixedly connected with a driving ring (37) on the side away from the cleaning brush (38).

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