Intelligent heat dissipation method, device and system for permanent magnet synchronous motor

Abstract

The application relates to the field of electric machines, in particular to a permanent magnet synchronous motor intelligent heat dissipation method, device and system. The method determines the temperature change of each local water flow by monitoring and analyzing the temperature distribution of each sub-section of a heat exchange section, determines the current temperature of each local water flow, can determine the target pumping parameter which can maximize the comprehensive net heat absorption amount of each local water flow, and operates the pumping equipment with the parameter. In the application, the current temperature of each sub-section in the heat exchange section can be predicted, and the power of the next pumped water flow is determined based on the uneven temperature distribution of each sub-section of the heat exchange section, so that each local water flow in the heat exchange section can absorb as much heat as possible and reduce heat release in the next flow process, thereby maximizing the net heat absorption amount of the cooling water, reducing the heat feedback to the electric machine as much as possible, and ensuring the heat dissipation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a permanent magnet synchronous motor intelligent heat dissipation method, device and system. BACKGROUND

[0002] The water-cooled heat dissipation method is a common heat dissipation method for permanent magnet synchronous motors, which mainly pumps cooling liquid into the cooling pipeline opened on the motor shell to transfer the heat generated during motor operation, thereby achieving heat dissipation of the motor.

[0003] However, although the prior art can adjust the parameters of pumping water cooling liquid according to the heat generation of the motor, since the section of the water cooling pipeline in contact with the motor structure has a certain length, and the layout of the internal structure and material of the motor is not uniform, the heat distribution at each position of the section is not uniform. When the cooling liquid passes through a certain position, if the temperature of the cooling liquid is higher than the temperature of the position, not only the temperature of the position cannot be absorbed and taken away, but also the heat of the cooling liquid is returned to the motor, resulting in poor heat dissipation effect. SUMMARY

[0004] Therefore, it is necessary to provide a permanent magnet synchronous motor intelligent heat dissipation method, device and system to solve the above problems.

[0005] The present application is implemented as follows: a permanent magnet synchronous motor intelligent heat dissipation method, the method comprising:

[0006] S1: after the motor starts running, the temperature of each measuring point of the heat exchange section is monitored to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section;

[0007] S2: when the number of measuring points reaching the set temperature reaches the set proportion, the cooling water is pumped according to the set pumping power to fill the heat exchange section with cooling water;

[0008] S3: updating the temperature distribution of the heat exchange section;

[0009] S4: for each local water flow, the temperature change of the local water flow before reaching the current position is determined to determine the current temperature of the local water flow;

[0010] S5: determining the target pumping power of the next operation cycle according to the current temperature of each local water flow and the temperature distribution of the heat exchange section, so that the net heat absorption of each local water flow in the flow process of the next operation cycle is maximum;

[0011] S6: controlling the water pump to run for one operation cycle with the target parameters, and repeatedly executing steps S3 to S6 until the motor stops running.

[0012] In one embodiment, the application provides an intelligent heat dissipation device for a permanent magnet synchronous motor, which comprises a module for executing the intelligent heat dissipation method for the permanent magnet synchronous motor, and specifically comprises:

[0013] a monitoring module for monitoring the temperature of each measuring point in the heat exchange section after the motor starts running to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section;

[0014] a first processing module for pumping cooling water according to a set pumping power to fill the heat exchange section with cooling water after the number of measuring points reaching the set temperature reaches a set proportion;

[0015] a second processing module for updating the temperature distribution of the heat exchange section;

[0016] a third processing module for determining the temperature change of each local water flow before reaching the current position to determine the current temperature of the local water flow;

[0017] a fourth processing module for determining the target pumping power of the next operation cycle according to the current temperature of each local water flow and the temperature distribution of the heat exchange section to maximize the net heat absorption of each local water flow during the flow process in the next operation cycle;

[0018] a cycle control module for controlling the water pump to run for an operation cycle according to the target parameters, and cyclically executing steps S3 to S6 until the motor stops running.

[0019] In one embodiment, the application provides an intelligent heat dissipation system for a permanent magnet synchronous motor, which comprises:

[0020] a plurality of temperature sensors, each of which is installed on a sub-section of the heat exchange section of the cooling pipeline of the permanent magnet synchronous motor to monitor the temperature of the sub-section;

[0021] a pumping device connected to the cooling pipeline for pumping cooling water to the heat exchange section of the cooling pipeline;

[0022] a computer device connected to the permanent magnet synchronous motor, the temperature sensors and the pumping device for executing the intelligent heat dissipation method for the permanent magnet synchronous motor.

[0023] This invention provides an intelligent heat dissipation method, device, and system for permanent magnet synchronous motors. The method includes: after the motor starts running, monitoring the temperature at various measuring points in the heat exchange section to obtain the temperature distribution of the heat exchange section; once the number of measuring points reaching a set temperature reaches a set proportion, pumping cooling water according to a set pumping power to fill the heat exchange section with cooling water; updating the temperature distribution of the heat exchange section; for each local water flow, determining the temperature change of that local water flow before reaching its current position to determine the current temperature of that local water flow; and determining the target for the next operating cycle based on the current temperature of each local water flow and the temperature distribution of the heat exchange section. The pumping power is adjusted to maximize the net heat absorption of each local water flow during the next operating cycle. The pump is controlled to run for one operating cycle with target parameters, and the above steps are repeated until the motor stops. In this application, the current temperature of each sub-section in the heat exchange section can be predicted, and the power of the pumping water flow is determined based on the uneven temperature distribution of each sub-section in the heat exchange section. This allows each local water flow in the heat exchange section to absorb as much heat as possible and release as little heat as possible during the subsequent flow, thereby maximizing the net heat absorption of the cooling water and minimizing the return of heat to the motor, thus ensuring the heat dissipation effect. Attached Figure Description

[0024] Figure 1 This is a first flowchart of an intelligent heat dissipation method for a permanent magnet synchronous motor provided in one embodiment;

[0025] Figure 2 This is a second flowchart of an intelligent heat dissipation method for a permanent magnet synchronous motor provided in one embodiment;

[0026] Figure 3 This is a schematic diagram of the heat exchange section of an intelligent heat dissipation method for a permanent magnet synchronous motor provided in one embodiment;

[0027] Figure 4 This is a partial water flow diagram of an intelligent heat dissipation method for a permanent magnet synchronous motor provided in one embodiment;

[0028] Figure 5 This is a schematic diagram of the module flow of an intelligent heat dissipation device for a permanent magnet synchronous motor provided in one embodiment;

[0029] Figure 6 This is a schematic diagram of the composition of an intelligent heat dissipation system for a permanent magnet synchronous motor provided in one embodiment;

[0030] Figure 7 This is a block diagram of the internal structure of a computer device in one embodiment. Detailed Implementation

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0032] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but unless specifically stated, these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first xx script can be referred to as the second xx script, and similarly, the second xx script can be referred to as the first xx script.

[0033] As shown in Figures 1-2 In one embodiment, a permanent magnet synchronous motor intelligent heat dissipation method is proposed, the method comprising:

[0034] S1: After the motor starts running, the temperature of each measuring point in the heat exchange section is monitored to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section;

[0035] S2: After the number of measuring points reaching the set temperature reaches a set proportion, the cooling water is pumped according to the set pumping power to fill the heat exchange section with cooling water;

[0036] S3: Update the temperature distribution of the heat exchange section;

[0037] S4: For each local water flow, determine the temperature change of the local water flow before reaching the current position to determine the current temperature of the local water flow;

[0038] S5: According to the current temperature of each local water flow and the temperature distribution of the heat exchange section, determine the target pumping power of the next operation cycle to maximize the net heat absorption of each local water flow during the flow process in the next operation cycle;

[0039] S6: Control the water pump to run for one operation cycle with the target parameters, and execute steps S3 to S6 cyclically until the motor stops running.

[0040] In the embodiment, the method is executed in a computer device, which can be a standalone physical server or terminal, a server cluster composed of multiple physical servers, a cloud server providing basic cloud computing services such as cloud server, cloud database, cloud storage and CDN, etc. A cooling pipeline is opened in the permanent magnet synchronous motor, and the two ends of the cooling pipeline extend outside the permanent magnet synchronous motor and intersect with the pumping device. The pumping device can make the cooling water circulate in the cooling pipeline by pumping. The heat exchange section is the pipe wall of the section of the cooling pipeline inside the permanent magnet synchronous motor. The heat generated by the permanent magnet synchronous motor is conducted to the heat exchange section through the internal structure of the motor and exchanges heat with the cooling water in the pipeline. As shown in Figure 3 The heat exchange section is divided into several equal-length sub-sections in advance, each sub-section is a measuring point and is provided with a temperature sensor (such as a patch temperature sensor, which is installed on the outer wall of the cooling pipeline and has a length corresponding to the length of the sub-section, and can detect the temperature of a sub-section), which can monitor the temperature of the sub-section. Each temperature sensor can transmit the monitored temperature to the computer device. In addition, the pumping device includes a centrifugal pump, a water tank for storing cooling water, a condenser for refrigerating the cooling water, and a thermometer for monitoring the temperature of the pumped cooling water (i.e. the initial temperature of the cooling water). The pumping device is controlled by the computer device, which can control the pumping power of the pumping device according to the data analysis of the temperature of the sub-sections.

[0041] In the embodiment, due to the complex internal structure of the permanent magnet motor, the heat transfer path of the heat conducted by the heat source (such as the stator winding, the rotor, etc.) is complex, and the heat transfer efficiency of different heat transfer paths is also different, which further causes the heat transferred to the heat exchange section in real time to be inconsistent, so that the heat of each sub-section is also different, which causes the temperature distribution deviation of the sub-sections, and further causes the heat absorption of the water flow in different sub-sections to be deviated.

[0042] As shown in Figure 4 In the embodiment, when the water flow is full in the cooling pipeline, the water flow is also full in the heat exchange section. At this time, the water flow in the cooling pipeline can be regarded as a complete column, and each local water flow is a local water flow column that constitutes the complete column.

[0043] In the embodiment, the ratio can be 50% or other ratios; the running period can be 2 seconds, 3 seconds or other time lengths; the pumping power of the permanent magnet motor is 2kW~5kW, different pumping powers have different propulsion capabilities for water flow, and then the water flow speed is also different, each pumping power corresponds to a specific water flow speed, in the embodiment, the staff pre-determines and inputs a comparison table of pumping power and water flow speed (including the water flow speed corresponding to each pumping power) into the computer device for calling at any time; the thermometer in the pumping device can monitor the initial temperature of the local water flow, and then for each local water flow, the current temperature of the local water flow can be inferred according to the initial temperature and the temperature of the sub-sections that the local water flow has passed through when the water flow passes through; then, according to the current temperature of each local water flow and the temperature distribution of the current heat exchange section, the heat absorption / dissipation of each local water flow in the next running period under various pumping powers (i.e. various water flow speeds) can be inferred, and then the target pumping power that can maximize the net heat absorption of the cooling water is determined, and the cooling water is pumped in the next running period according to the target pumping power, so that the maximum heat dissipation of the motor can be achieved, and the heat dissipation efficiency of the whole heat dissipation process is the highest.

[0044] In the present application, the current temperature of each sub-section in the heat exchange section can be predicted, and the power of the next pumped water flow is determined based on the uneven temperature distribution of each sub-section in the heat exchange section, so that each local water flow in the heat exchange section can absorb as much heat as possible and reduce heat dissipation in the next flow process, thereby maximizing the net heat absorption of the cooling water, reducing the heat back to the motor as much as possible, and ensuring the heat dissipation effect.

[0045] As a preferred embodiment, the temperature change of the local water flow before reaching the current position is determined to determine the current temperature of the local water flow, comprising:

[0046] S41: obtaining the historical temperature distribution of the heat exchange section, so as to determine the temperature of each sub-section in each time period in the past;

[0047] S42: obtaining the historical pumping power of each time period in the past to determine the water flow speed of the local water flow in each time period in the past, to calculate the time consumption of the local water flow from the starting position of the heat exchange section to the current position, so as to determine the time when the local water flow enters the heat exchange section;

[0048] S43: determining the number n of sub-sections passed through by the local water flow, and letting i=1, wherein the section between the current position of the local water flow and the last sub-section endpoint position is regarded as the last sub-section passed through by the local water flow;

[0049] S44: calculating the temperature of the local water flow when leaving the i-th sub-section according to the temperature of the local water flow when entering the i-th sub-section, wherein the temperature of the local water flow when entering the i-th sub-section is the initial temperature of the water flow, and the initial temperature is detected by the pumping device;

[0050] S45: setting i = i + 1, and performing steps S44 to S45 until i is greater than n, to obtain the current temperature of the local water flow.

[0051] The temperature of the local water flow when leaving the i-th sub-section is calculated according to the temperature of the local water flow when entering the i-th sub-section, by the following formula:

[0052]

[0053] wherein, T is the temperature of the local water flow when leaving the i-th sub-section, T is the temperature of the local water flow when entering the i-th sub-section, T is the average temperature of the i-th sub-section in the period when the local water flow passes through the i-th sub-section; A is the total heat exchange area of the i-th sub-section, m is the mass of the local water flow, C is the specific heat capacity of water, h is the convective heat transfer coefficient corresponding to the average speed of the local water flow in the i-th sub-section, and the faster the average speed of the local water flow, the greater the value of h.

[0054] The total heat exchange area is calculated by the following formula:

[0055]

[0056] wherein, a is the total heat exchange area reduction factor of the i-th sub-section, D is the pipe diameter of the heat exchange section, L L is the length of the sub-section;

[0057]

[0058] wherein, p is the density of water, L is the length of the local water flow.

[0059] In the embodiment, the acquired historical temperature distribution includes historical temperature distributions of each time period in the past, and the temperature of each sub-section in each time period can be determined; the length of the local water flow is much smaller than the length of the sub-section, for example, the length of the local water flow is 2 cm and the length of the sub-section is 20 cm, so that the local water flow is regarded as a micro-element in the sub-section (but the length of the local water flow is greater than the diameter of the cooling pipeline, for example, the length of the local water flow can be set to 2 cm and the diameter of the cooling pipeline is 1 cm); each historical temperature distribution and historical pumping power are stored in the computer device; for each local water flow, the current position (the position of the end of the local water flow) and the length of the starting end of the heat exchange section, i.e. the target distance of the local water flow moving in the heat exchange section, are known, and the moving distance of the water flow in each time period in the past can be calculated, while the corresponding time length (the last time period may only accumulate part of it) and the corresponding moving distance of each time period are accumulated, so that when the accumulated moving distance reaches the target distance, the corresponding accumulated time length is obtained, i.e. the time consumption of the local water flow from the starting position of the heat exchange section to the current position; the time when the local water flow enters the heat exchange section can be obtained by subtracting the time consumption from the current time.

[0060] In the embodiment, the temperature of the i-th sub-section may change when the local water flow passes through the time period, is the average temperature of the i-th sub-section in the time period when the local water flow passes through, and the average temperature is the weighted average value of the time period, and the weight added for each temperature is the proportion of the time length during which the temperature lasts;

[0061] In the embodiment, the length of the local water flow is thus the heat absorption and release amount of the local water flow in the process of crossing the sub-section; the local water flow enters a sub-section, i.e. the local water flow completely enters the sub-section, and the local water flow leaves a sub-section, i.e. the local water flow completely leaves the sub-section; the time when a local water flow leaves the current sub-section is consistent with the time when the local water flow enters the next sub-section;

[0062] In the embodiment, for the micro-element segment length of the sub-section dx , the heat exchange amount between the water flow and the pipeline wall surface follows the Newton cooling formula:

[0063]

[0064] wherein, is the heat exchange area of the micro-element segment, , is the temperature difference between the wall surface and the water flow;

[0065] In addition, the change in internal energy of the water flow is equal to the heat absorption amount:

[0066]

[0067] By combining the two formulas,

[0068]

[0069] After variable separation, we have:

[0070]

[0071] Integrate both sides:

[0072]

[0073] We get:

[0074]

[0075] Take the exponential of both sides, and eliminate the logarithm, we get:

[0076] .

[0077] In this embodiment, the way of determining the time when the local water flow enters the i-th sub-section and the time when the local water flow leaves the i-th sub-section is the same as the way of determining the time when the local water flow enters the heat exchange section, which is not described here; the speed-convective heat transfer coefficient table is preset in the computer device, and the corresponding convective heat transfer coefficient can be determined according to the speed of the local water flow moving in the sub-section; in addition, since the speed of the local water flow moving in the sub-section may change, the speed is the average speed; moreover, the contact area of each sub-section with the motor internal structure is not the same, some are full contact (the total heat exchange area reduction coefficient can be considered as 1), some are partial contact, and then a value of the total heat exchange area reduction coefficient is 0~1 (the specific value can be determined in advance according to the contact proportion of the sub-section pipe wall and the motor structure, for example, if half of the pipe wall is in contact with the motor structure, the total heat exchange area reduction coefficient is taken as 0.5).

[0078] As a preferred embodiment, the target pumping power of the next setting time length is determined according to the current temperature of each local water flow and the temperature distribution of the heat exchange section, including:

[0079] S51: retrieve the pumping power range, and select a pumping power from the pumping power range as the simulation power;

[0080] S52: determine the simulation water flow speed corresponding to the simulation power;

[0081] S53: for each local water flow, calculate the heat absorption amount of the local water flow flowing at the simulation water flow speed for the set time length from the current position;

[0082] S54: calculate the sum of the heat absorption amounts of each local water flow to obtain the net heat absorption amount;

[0083] S55: selecting another pumping power from the pumping power range as the simulation power, performing steps S52 to S55 until the net heat absorption corresponding to each pumping power in the pumping power range is obtained;

[0084] S56: determining the simulation power corresponding to the maximum net heat absorption as the target pumping power.

[0085] calculating the heat absorption of the local water flow flowing at the simulation water flow speed for the set time length from the current position, comprising:

[0086] determining the arrival position of the local water flow flowing at the simulation water flow speed for the set time length from the current position;

[0087] judging whether the arrival position crosses the sub-section compared with the current position;

[0088] if not, determining the section between the current position and the arrival position as the simulation section;

[0089] calculating the temperature of the local water flow flowing to the end of the simulation section according to the current temperature of the local water flow, thereby calculating the heat absorption of the local water flow in the process of flowing in the simulation section, and obtaining the heat absorption of the local water flow flowing at the simulation water flow speed for the set time length from the current position;

[0090] if yes, dividing the section between the current position and the arrival position into a first simulation section and a second simulation section with the endpoints of the sub-section as the boundary;

[0091] calculating the temperature of the local water flow flowing to the end of the first simulation section according to the current temperature of the local water flow, and then calculating the temperature of the local water flow flowing to the end of the second simulation section according to the temperature of the local water flow flowing to the end of the first simulation section, thereby calculating the first heat absorption of the local water flow in the process of flowing in the first simulation section, and the second heat absorption of the local water flow in the process of flowing in the second simulation section, and adding the first heat absorption and the second heat absorption to obtain the heat absorption of the local water flow flowing at the simulation water flow speed for the set time length from the current position.

[0092] the heat absorption of the local water flow in the process of flowing in the simulation section is calculated by the following formula:

[0093]

[0094] wherein, is the heat absorption of the local water flow in the process of flowing in the simulation section, is the current temperature, is the temperature of the local water flow flowing to the end of the simulation section, T is the time variable ， is the water flow mass of the local water flow, is the specific heat capacity of water.

[0095] In this embodiment, since the operating cycle is a relatively short duration (e.g., 2 seconds), and due to the lag of temperature change relative to heat transfer, the temperature distribution of the current heat exchange section can be regarded as the temperature distribution of the next operating cycle. During the subsequent operating cycle, the local water flow may exhibit two scenarios: either it remains within the current sub-section, or it crosses over to the next sub-section. If it remains within the current sub-section, the temperature of the sub-section is uniform, and the section between the current position and the destination position can be treated as a single simulated section for calculation. If it crosses over to the next sub-section, the temperatures of the two sub-sections are different, requiring the section between the current position and the destination position to be divided into two simulated sections. The section from the current position to the endpoint of the sub-section (the end of the current sub-section) is the first simulated section, and the section from the endpoint of the sub-section to the destination position is the second simulated section, thus allowing for separate simulation calculations.

[0096] In this embodiment, the current temperature is known. The method for calculating the temperature when the local water flow reaches the end of the simulated section is the same as the method for calculating the temperature when the local water flow leaves the i-th sub-section, and will not be repeated here. For the case of dividing into two simulated sections, after calculating the temperature when the local water flow reaches the end of the first simulated section, the temperature when the local water flow reaches the end of the second simulated section can be calculated using this temperature as the known temperature. Thus, the heat absorbed by the local water flow in the first simulated section (the heat absorbed is negative when the local water flow is releasing heat) and the heat absorbed in the second simulated section can be calculated respectively, thereby calculating the heat absorbed by the local water flow from the current position for a set time at the simulated water flow speed.

[0097] like Figure 5 As shown, in one embodiment, a smart heat dissipation device for a permanent magnet synchronous motor is proposed. The module of the smart heat dissipation device is used to execute the smart heat dissipation method for the permanent magnet synchronous motor, specifically including:

[0098] The monitoring module is used to monitor the temperature of each measuring point in the heat exchange section after the motor starts running, and obtain the temperature distribution of the heat exchange section. The temperature of each measuring point represents the temperature of a sub-section of the heat exchange section.

[0099] The first processing module is used to pump cooling water according to the set pumping power after the number of measuring points that reach the set temperature reaches the set ratio, so that the heat exchange section is filled with cooling water.

[0100] The second processing module is used to update the temperature distribution in the heat exchange section;

[0101] The third processing module is used to determine the temperature change of each local water flow before it reaches the current position, so as to determine the current temperature of the local water flow.

[0102] a fourth processing module configured to determine a target pumping power for a next operation cycle according to the current temperature of each local water flow and the temperature distribution of the heat exchange section, so that the net heat absorption of each local water flow in the flow process of the next operation cycle is maximized;

[0103] a cycle control module configured to control the water pump to operate for one operation cycle according to the target parameters, and cyclically execute steps S3 to S6 until the motor stops operating.

[0104] The process in which each module in the intelligent heat dissipation device of the permanent magnet synchronous motor realizes its own function is specifically referable to the description of the foregoing Figure 1 embodiments, which will not be described herein again.

[0105] As Figure 6 shown in one embodiment, an intelligent heat dissipation system of a permanent magnet synchronous motor is provided, and the system comprises:

[0106] a plurality of temperature sensors, each of which is installed on a sub-section of the heat exchange section of the cooling pipeline of the permanent magnet synchronous motor, and is configured to monitor the temperature of the sub-section;

[0107] a pumping device connected with the cooling pipeline, and configured to pump cooling water to the heat exchange section of the cooling pipeline;

[0108] a computer device connected with the permanent magnet synchronous motor, the temperature sensors, and the pumping device, and configured to execute the intelligent heat dissipation method of the permanent magnet synchronous motor.

[0109] In this embodiment, the computer device cooperates with the temperature sensors and the pumping device to predict the current temperature of each sub-section of the heat exchange section, and determines the power of the next water flow based on the uneven temperature distribution of each sub-section of the heat exchange section, so that each local water flow in the heat exchange section absorbs as much heat as possible and reduces heat release in the next flow process, thereby maximizing the net heat absorption of the cooling water and reducing the heat feedback to the motor as much as possible, and ensuring the heat dissipation effect.

[0110] Figure 7 An internal structure diagram of the computer device in one embodiment is shown. As Figure 7As shown, the computer device includes a processor, memory, network interface, input device, and display screen connected via a system bus. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and may also store a computer program. When executed by the processor, this computer program enables the processor to implement the intelligent heat dissipation method for permanent magnet synchronous motors provided in this embodiment of the invention. The internal memory may also store a computer program, which, when executed by the processor, enables the processor to implement the intelligent heat dissipation method for permanent magnet synchronous motors provided in this embodiment of the invention. The display screen of the computer device can be a liquid crystal display (LCD) or an e-ink display. The input device can be a touch layer covering the display screen, buttons, a trackball, or a touchpad mounted on the computer device casing, or an external keyboard, touchpad, or mouse, etc.

[0111] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. A specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0112] In one embodiment, the intelligent heat dissipation device for permanent magnet synchronous motors provided in this invention can be implemented as a computer program, which can be implemented in various ways, such as... Figure 7 The computer device shown is running the program. The computer device's memory can store the various program modules that make up the intelligent cooling device for the permanent magnet synchronous motor, for example... Figure 5 The diagram shows a monitoring module, a first processing module, a second processing module, a third processing module, a fourth processing module, and a loop control module. The computer program comprised of these modules causes the processor to execute the steps in the intelligent heat dissipation method for permanent magnet synchronous motors described in the various embodiments of the present invention.

[0113] For example, Figure 7 The computer equipment shown can be used as follows Figure 5 The monitoring module in the intelligent heat dissipation device for permanent magnet synchronous motor shown executes step S1; the computer device can execute step S2 through the first processing module; the computer device can execute step S3 through the second processing module; the computer device can execute step S4 through the third processing module; the computer device can execute step S5 through the fourth processing module; and the computer device can execute step S6 through the loop control module.

[0114] In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:

[0115] S1: after the motor starts running, the temperature of each measuring point of the heat exchange section is monitored to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section;

[0116] S2: after the number of measuring points reaching the set temperature reaches a set proportion, the cooling water is pumped according to the set pumping power to fill the heat exchange section with cooling water;

[0117] S3: updating the temperature distribution of the heat exchange section;

[0118] S4: for each local water flow, the temperature change of the local water flow before reaching the current position is determined to determine the current temperature of the local water flow;

[0119] S5: according to the current temperature of each local water flow and the temperature distribution of the heat exchange section, the target pumping power of the next running cycle is determined to maximize the net heat absorption of each local water flow during the flow process of the next running cycle;

[0120] S6: controlling the water pump to run for one running cycle with the target parameters, and executing steps S3 to S6 cyclically until the motor stops running.

[0121] In one embodiment, a computer readable storage medium is provided, and the computer readable storage medium stores a computer program, and the computer program is executed by a processor to make the processor execute the following steps:

[0122] S1: after the motor starts running, the temperature of each measuring point of the heat exchange section is monitored to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section;

[0123] S2: after the number of measuring points reaching the set temperature reaches a set proportion, the cooling water is pumped according to the set pumping power to fill the heat exchange section with cooling water;

[0124] S3: updating the temperature distribution of the heat exchange section;

[0125] S4: for each local water flow, the temperature change of the local water flow before reaching the current position is determined to determine the current temperature of the local water flow;

[0126] S5: according to the current temperature of each local water flow and the temperature distribution of the heat exchange section, the target pumping power of the next running cycle is determined to maximize the net heat absorption of each local water flow during the flow process of the next running cycle;

[0127] S6: controlling the water pump to run for one running cycle with the target parameter, and executing steps S3 to S6 cyclically until the motor stops running.

[0128] It should be understood that although each step in the flowchart of each embodiment of the present application is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in each embodiment can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or sub-steps or stages of other steps.

[0129] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware, and the program can be stored in a non-volatile computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiments of each method. Any reference to memory, storage, database or other medium used in each embodiment provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0130] Each technical feature of the above-mentioned embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of each technical feature in the above-mentioned embodiments are not described, but as long as the combination of these technical features does not exist, it should be considered as the scope of the present application.

[0131] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A permanent magnet synchronous motor intelligent heat dissipation method, characterized in that, The method comprises: S1: monitoring the temperature of each measuring point of the heat exchange section after the motor starts running to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section; S2: after the number of measuring points reaching the set temperature reaches a set proportion, pumping cooling water according to the set pumping power to fill the heat exchange section with cooling water; S3: updating the temperature distribution of the heat exchange section; S4: for each local water flow, determining the temperature change of the local water flow before reaching the current position to determine the current temperature of the local water flow; S5: determining the target pumping power of the next operation cycle according to the current temperature of each local water flow and the temperature distribution of the heat exchange section to maximize the net heat absorption of each local water flow during the flow process of the next operation cycle; S6: controlling the water pump to run for an operation cycle with the target parameters, and repeatedly executing steps S3 to S6 until the motor stops running; S41: obtaining the historical temperature distribution of the heat exchange section to determine the temperature of each sub-section at each time period in the past; S42: obtaining the historical pumping power at each time period in the past to determine the flow speed of the local water flow at each time period in the past, to calculate the time consumption of the local water flow from the starting position of the heat exchange section to the current position, and to determine the time when the local water flow enters the heat exchange section; S43: determining the number n of sub-sections passed by the local water flow, and setting i=1, wherein the section between the current position of the local water flow and the end position of the last sub-section is regarded as the last sub-section passed by the local water flow; S44: calculating the temperature of the local water flow when leaving the i-th sub-section according to the temperature of the local water flow when entering the i-th sub-section, wherein the temperature of the local water flow when entering the i-th sub-section is the initial temperature of the water flow, which is detected by the pumping device; S45: setting i=i+1, and executing steps S44 to S45 until i is greater than n to obtain the current temperature of the local water flow; S44: calculating the temperature of the local water flow when leaving the i-th sub-section according to the temperature of the local water flow when entering the i-th sub-section, which is performed by the following formula: The total heat exchange area is calculated by the following formula: wherein, T is the temperature of the local water stream when leaving the i-th sub-section, T is the temperature of the local water stream when entering the i-th sub-section, T is the average temperature of the i-th sub-section during the time period when the local water stream passes through it; A is the total heat exchange area of the i-th sub-section, m is the mass of the local water stream, C is the specific heat capacity of water, h is the convective heat transfer coefficient corresponding to the average velocity of the local water stream flowing through the i-th sub-section, the faster the average velocity of the local water stream, the larger the value of h is.

2. The method of claim 1, wherein, S51: calling the pumping power range, and selecting a pumping power from the pumping power range as the simulation power; wherein, is the total heat exchange area reduction factor for the i-th sub-section, is the tube diameter of the heat exchange section, L is the length of the sub-section; wherein, is the density of water, is the length of the local water flow.

3. The method of claim 1, wherein, S52: determining the simulation flow speed corresponding to the simulation power; S53: for each local water flow, calculating the heat absorption of the local water flow flowing at the simulation flow speed for a set time length from the current position; S54: calculating the sum of the heat absorptions of all local water flows to obtain the net heat absorption; S55: selecting another pumping power from the pumping power range as the simulation power, and executing steps S52 to S55 until the net heat absorption corresponding to each pumping power in the pumping power range is obtained; S56: determining the simulation power corresponding to the maximum net heat absorption as the target pumping power. ​ ​ 4. The method of claim 3, wherein, The heat absorption amount of the local water flow flowing from the current position at the simulation water flow speed for the set time length is calculated, comprising: determining the arrival position of the local water flow after flowing from the current position at the simulation water flow speed for the set time length; judging whether the arrival position crosses the sub-section compared with the current position; if not, determining the section between the current position and the arrival position as the simulation section; calculating the temperature of the local water flow when flowing to the end of the simulation section according to the current temperature of the local water flow, so as to calculate the heat absorption amount of the local water flow in the process of flowing in the simulation section, and obtain the heat absorption amount of the local water flow flowing from the current position at the simulation water flow speed for the set time length; if yes, dividing the section between the current position and the arrival position into the first simulation section and the second simulation section with the end points of the sub-section as the boundaries; calculating the temperature of the local water flow when flowing to the end of the first simulation section according to the current temperature of the local water flow, and then calculating the temperature of the local water flow when flowing to the end of the second simulation section according to the temperature of the local water flow when flowing to the end of the first simulation section, so as to calculate the first heat absorption amount of the local water flow in the process of flowing in the first simulation section, and the second heat absorption amount of the local water flow in the process of flowing in the second simulation section, and add the first heat absorption amount and the second heat absorption amount to obtain the heat absorption amount of the local water flow flowing from the current position at the simulation water flow speed for the set time length.

5. The method of claim 4, wherein, The heat absorption amount of the local water flow flowing in the simulation section is calculated by the following formula: wherein, is the amount of heat absorbed by the local water flow during the flow through the simulated section, is the current temperature, is the temperature of the local water flow at the end of the flow through the simulated section, T is the time variable ， is the mass of the water flow of the local water flow, is the specific heat capacity of water.

6. An intelligent heat dissipation device for permanent magnet synchronous motor, characterized in that, The module of the intelligent heat dissipation device of the permanent magnet synchronous motor is used to execute the intelligent heat dissipation method of the permanent magnet synchronous motor in claim 1, and specifically comprises: a monitoring module, configured to monitor the temperature of each measuring point of the heat exchange section after the motor starts running to obtain the temperature distribution of the heat exchange section, wherein the temperature of each measuring point represents the temperature of a sub-section of the heat exchange section; a first processing module, configured to pump cooling water according to the set pumping power to fill the heat exchange section with cooling water after the number of measuring points reaching the set temperature reaches a set proportion; a second processing module, configured to update the temperature distribution of the heat exchange section; a third processing module, configured to determine the temperature change of each local water flow before the current position to determine the current temperature of the local water flow; a fourth processing module, configured to determine the target pumping power of the next running cycle according to the current temperature of each local water flow and the temperature distribution of the heat exchange section to maximize the net heat absorption amount of each local water flow in the flowing process in the next running cycle; a cycle control module, configured to control the water pump to run for a running cycle with the target parameters, and cyclically execute steps S3 to S6 until the motor stops running.

7. An intelligent heat dissipation system for permanent magnet synchronous motor, characterized in that, The system comprises: a plurality of temperature sensors, each temperature sensor being installed on a sub-section of the heat exchange section of the cooling pipeline of the permanent magnet synchronous motor to monitor the temperature of the sub-section; a pumping device connected with the cooling pipeline to pump cooling water to the heat exchange section of the cooling pipeline; a computer device connected with the permanent magnet synchronous motor, the temperature sensors and the pumping device to execute the intelligent heat dissipation method of the permanent magnet synchronous motor according to any one of claims 1 to 5.

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