Motor protection method, device, equipment and storage medium

Abstract

The present application discloses a motor protection method, device, equipment and storage medium, which relates to the field of power system management technology. The motor protection method includes: obtaining the operating parameters of the motor; obtaining the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor; obtaining the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment; controlling the cooling water pump according to the current temperature of the motor and the residual heat within the preset time of the motor using the corresponding cooling water pump control strategy. The technical effect of the present application is to control the operation of the cooling water pump by real-time monitoring of the temperature and heat generation of the motor, so as to protect the motor from high temperature damage, extend its service life, and ensure the safety and reliability of the vehicle.

Description

Technical Field

[0001] The present application relates to the field of power system management technology, and in particular to motor protection methods, devices, equipment and storage media. Background Art

[0002] With the rapid development of new energy vehicle technology, the performance and reliability of motors, as core power components, have a crucial impact on the performance of the entire vehicle. During the operation of electric vehicles, motors need to maintain stable and efficient working conditions under various temperature conditions. Especially in low temperature environments, the heat generated by motors can provide the necessary heat for batteries, while in high temperature environments, the heat dissipation of motors becomes particularly important. Therefore, effective thermal management of motors to ensure that they operate within an appropriate temperature range is a key requirement to ensure the reliability and safety of new energy vehicles.

[0003] At present, direct cooling and heating technology for batteries has been widely used in many new energy vehicle models. Its working principle is to use the heat generated by the motor to heat the battery in a low-temperature environment. This technology transfers the heat generated by the motor to the battery through the circulation of refrigerant to maintain the battery at the optimal operating temperature. However, this technology has not yet fully solved the heat dissipation problem of the motor when it is running for a long time or in a high-temperature environment, which may cause the motor to demagnetize or be damaged due to overheating.

[0004] Although direct cooling and direct heating technology has solved the heating problem of batteries in low temperature environments to a certain extent, its heat dissipation efficiency is insufficient when the motor runs at high temperature for a long time, and it cannot effectively control the motor temperature, thereby increasing the risk of motor damage. In addition, the existing heat dissipation control strategy may lack accurate monitoring and prediction of the temperature change trend of the motor, resulting in the cooling water pump being turned on and off in an untimely or inaccurate manner, and unable to achieve accurate control of the motor temperature. Therefore, how to effectively control the motor temperature by intelligently controlling the cooling water pump has become an urgent problem to be solved. Summary of the invention

[0005] The purpose of this application is to provide a motor protection method, device, equipment and storage medium, aiming to solve the technical problem of how to effectively control the motor temperature by intelligently controlling the cooling water pump.

[0006] To achieve the above object, the present application proposes a motor protection method, the method comprising:

[0007] Get the operating parameters of the motor;

[0008] According to the operating parameters of the motor, the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment are obtained;

[0009] According to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment, the residual heat of the motor within a preset time is obtained;

[0010] The cooling water pump is controlled by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time.

[0011] In one embodiment, obtaining the heat generated by the motor at a current moment according to the operating parameters of the motor includes:

[0012] Get the current torque, current speed and preset scheduling cycle of the motor;

[0013] Based on the current torque and the current speed, query a motor efficiency table to obtain a current motor efficiency;

[0014] Based on the operating voltage, the operating current, the preset scheduling period and the current motor efficiency, the heat generated by the motor at the current moment is obtained.

[0015] In one embodiment, obtaining the amount of heat dissipated by the motor through the motor housing at a current moment according to the operating parameters of the motor includes:

[0016] Obtaining the heat transfer coefficient, the first heat correction parameter, the average internal and external temperature difference of the motor housing at the current moment, the surface area of ​​the motor housing, and the preset scheduling period;

[0017] Based on the average internal and external temperatures of the motor housing at the current moment, the surface area of ​​the motor housing, the preset scheduling period, the thermal conductivity coefficient and the first heat correction parameter, the amount of heat dissipated by the motor through the motor housing at the current moment is obtained.

[0018] In one embodiment, obtaining the amount of heat dissipated by the motor through water cooling at a current moment according to the operating parameters of the motor includes:

[0019] Obtain the second heat correction parameter, the current inlet and outlet temperature difference and specific heat value, and the preset scheduling cycle;

[0020] Based on the second heat correction parameter, the inlet and outlet temperature difference at the current moment, the specific heat capacity and the preset scheduling period, the heat dissipation of the motor through water cooling at the current moment is obtained.

[0021] In one embodiment, the residual heat of the motor within a preset time is obtained according to the heat generated by the motor at the current moment, the heat dissipated by the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment, including:

[0022] Get the preset number of time steps;

[0023] Based on the preset number of time steps and the preset scheduling period, a preset time is obtained;

[0024] The residual heat of the motor within the preset time is obtained according to the heat currently generated by the motor, the heat dissipated by the motor housing at the current moment, the heat dissipated by the motor through water cooling at the current moment, and the preset time.

[0025] In one embodiment, the cooling water pump is controlled by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time, including:

[0026] Obtaining a preset first temperature threshold, a preset second temperature threshold, a preset first heat threshold, and a preset second heat threshold;

[0027] If the current temperature of the motor is greater than the preset first temperature threshold or the residual heat of the motor within a preset time is greater than the preset first heat threshold, the cooling water pump uses the first preset operating power;

[0028] If the current temperature of the motor is lower than the preset second temperature threshold and the residual heat of the motor within a preset time is lower than the preset second heat threshold, the cooling water pump is turned off;

[0029] If the current temperature of the motor and the residual heat of the motor within a preset time do not meet the above conditions, the cooling water pump uses a second preset operating power.

[0030] In one embodiment, before controlling the cooling water pump using a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time, the method further includes:

[0031] Acquire a preset voltage interval, a preset current interval, a preset phase current interval, a preset third temperature threshold, and a current temperature of the motor;

[0032] If the operating voltage exceeds the preset voltage range, the operating current exceeds the preset current range, the operating phase current exceeds the preset phase current range, and the current temperature of the motor exceeds any one of the preset third temperature thresholds, the motor is turned off.

[0033] In addition, to achieve the above-mentioned purpose, the present application also proposes a motor protection device, the device comprising:

[0034] An acquisition module is used to acquire the operating parameters of the motor;

[0035] An obtaining module, used for obtaining the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor;

[0036] A calculation module, used for obtaining the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment;

[0037] The control module is used to control the cooling water pump by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time.

[0038] In addition, to achieve the above objectives, the present application also proposes a motor protection device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the motor protection method described above.

[0039] In addition, to achieve the above objectives, the present application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the motor protection method described above are implemented.

[0040] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the motor protection method described above are implemented.

[0041] One or more technical solutions proposed in this application have at least the following technical effects:

[0042] This application first obtains the operating parameters of the motor to accurately calculate the heat generated by the motor at the current moment, the heat dissipated through the motor housing, and the heat dissipated through the water cooling system. These data provide a basis for evaluating the thermal state of the motor. Then, combined with these heat dissipations and the heat generated, the residual heat of the motor within a preset time can be predicted, which is crucial for evaluating the thermal load and potential overheating risks of the motor. Finally, according to the current temperature of the motor and the residual heat within the preset time, the corresponding cooling water pump control strategy is adopted to effectively adjust the operation of the cooling water pump to keep the motor within a suitable operating temperature range. This application realizes real-time monitoring and intelligent control of the motor temperature, thereby optimizing the thermal management of the motor, improving the reliability and service life of the motor, and ensuring the safety and performance of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 A schematic diagram of a flow chart provided for the first embodiment of the motor protection method of the present application;

[0046] Figure 2 A schematic diagram of a flow chart provided for the second embodiment of the motor protection method of the present application;

[0047] Figure 3 A brief flowchart of the motor protection method according to an embodiment of the present application;

[0048] Figure 4 This is a schematic diagram of the module structure of the motor protection device according to an embodiment of the present application;

[0049] Figure 5 Schematic diagram of the device structure of the hardware operating environment involved in the motor protection method in the embodiment of the present application.

[0050] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0052] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0053] With the rapid development of new energy vehicle technology, the performance and reliability of the motor as a core power component have a vital impact on the performance of the entire vehicle. During the operation of electric vehicles, the motor needs to maintain a stable and efficient working state under various temperature conditions. Especially in low temperature environments, the heat generated by the motor can provide the necessary heat for the battery, while in high temperature environments, the heat dissipation of the motor becomes particularly important. Therefore, effective thermal management of the motor to ensure that it works within a suitable temperature range is a key requirement to ensure the reliability and safety of new energy vehicles. At present, battery direct cooling and direct heating technology has been widely used in many new energy vehicle models. Its working principle is to use the heat generated by the motor to heat the battery in a low temperature environment. This technology transfers the heat generated by the motor to the battery through the circulation of refrigerant to maintain the battery at the optimal operating temperature. However, the heat dissipation problem of this technology when the motor is running for a long time or in a high temperature environment has not been fully solved, resulting in the motor being demagnetized or damaged due to overheating. Although the direct cooling and direct heating technology solves the problem of battery heating in low temperature environments to a certain extent, when the motor runs at high temperature for a long time, its heat dissipation efficiency is insufficient and the motor temperature cannot be effectively controlled, thereby increasing the risk of motor damage. In addition, existing heat dissipation control strategies may lack accurate monitoring and prediction of motor temperature change trends, resulting in the cooling water pump being turned on and off in an untimely or accurate manner, making it impossible to achieve accurate control of the motor temperature.

[0054] The main solution of the embodiment of the present application is: the present application first obtains the operating parameters of the motor, and can accurately calculate the heat generated by the motor at the current moment, the heat dissipated through the motor housing, and the heat dissipated through the water cooling system. These data provide a basis for evaluating the thermal state of the motor. Then, combined with these heat dissipations and the heat generated, the residual heat of the motor within a preset time can be predicted, which is crucial for evaluating the thermal load and potential overheating risks of the motor. Finally, according to the current temperature of the motor and the residual heat within the preset time, the corresponding cooling water pump control strategy is adopted to effectively adjust the operation of the cooling water pump to keep the motor within a suitable operating temperature range. The present application realizes real-time monitoring and intelligent control of the motor temperature, thereby optimizing the thermal management of the motor, improving the reliability and service life of the motor, and ensuring the safety and performance of new energy vehicles.

[0055] It should be noted that the execution subject of the embodiment of the present application can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device that can realize the above functions. The following takes the vehicle-mounted electronic control unit as an example to illustrate this embodiment and the following embodiments.

[0056] Based on this, the present application embodiment provides a motor protection method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the motor protection method of the present application.

[0057] In this embodiment, the motor protection method includes steps S10 to S40:

[0058] Step S10, obtaining the operating parameters of the motor;

[0059] It should be noted that the operating parameters can be a series of data directly related to the working state of the motor, which is essential for evaluating the thermal state and performance of the motor. Specifically, the operating parameters include but are not limited to the current torque and speed of the motor, the operating voltage, the operating current, the operating phase current, the average internal and external temperature difference of the motor housing, the temperature difference between the inlet and outlet of the water, and the preset scheduling cycle. Through these operating parameters, the thermal state of the motor can be comprehensively evaluated, and the corresponding cooling strategy can be formulated accordingly to ensure that the motor operates within a safe and efficient temperature range.

[0060] It is understandable that by collecting key performance data of the motor during actual operation, including current torque, speed, voltage, current, phase current, etc., these data are crucial for accurately calculating the heat generated by the motor, the amount of heat dissipated, and subsequently formulating corresponding cooling strategies to ensure that the motor runs stably at an appropriate temperature.

[0061] Step S20, obtaining the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor;

[0062] It should be noted that the heat generated by the motor at the current moment may be the heat generated by the motor at the current moment due to its operation (such as rotation and conversion of electrical energy). The generation of this heat is closely related to the operating parameters of the motor (such as torque, speed, voltage and current). The heat dissipation of the motor through the motor housing at the current moment may be the heat dissipated by the motor through its housing to the surrounding environment. This heat dissipation depends on the thermal conductivity characteristics of the motor housing (such as thermal conductivity), the temperature difference between the inside and outside of the motor housing, the surface area of ​​the housing, and the preset scheduling cycle. This parameter reflects the heat dissipation capacity of the motor housing at a specific moment. The heat dissipation of the motor through water cooling at the current moment may be the heat dissipated by the motor through the water cooling system, which usually involves the process of absorbing heat and taking it away when the coolant (such as water) flows inside the motor. This heat dissipation depends on the specific heat capacity of the coolant, the temperature difference between the inlet and outlet of the water, the flow rate of the coolant, and the preset scheduling cycle. This parameter reflects the heat dissipation efficiency of the water cooling system at a specific moment. These three parameters together determine the thermal balance state of the motor at any given moment, which is crucial for formulating effective thermal management strategies and protecting the motor from overheating damage.

[0063] It is understandable that this step calculates the heat generated by the motor at the current moment due to operation by using the motor's real-time operating data, such as torque, speed, voltage, current, etc., and evaluates the heat dissipated by the motor through its housing and water cooling system. These three parameters together reflect the instantaneous thermal state of the motor and are essential for developing accurate thermal management measures. By accurately calculating these parameters, the thermal behavior of the motor can be predicted and the working state of the cooling water pump can be adjusted accordingly to maintain the motor within a safe operating temperature range.

[0064] As an example, the heat generated by the motor at a current moment is obtained according to the operating parameters of the motor, including: obtaining the current torque, current speed and preset scheduling cycle of the motor; based on the current torque and the current speed, querying the motor efficiency table to obtain the current motor efficiency; based on the operating voltage, operating current, the preset scheduling cycle and the current motor efficiency, obtaining the heat generated by the motor at a current moment.

[0065] Among them, the current torque and current speed describe the working state of the motor at a specific moment. The current torque can be the rotational torque of the motor output shaft at a certain moment, which reflects the load condition of the motor; the current speed can be the rotational speed of the motor rotor, usually expressed in revolutions per minute (RPM), which reflects the running speed of the motor. The preset scheduling cycle refers to a time interval preset in the motor control and monitoring system, which is used to regularly collect and update the operating parameters of the motor and execute related control strategies. This cycle determines how often the control system samples and processes data. For example, if the preset scheduling cycle is 0.1 seconds, the control system will read the torque, speed, voltage, and current of the motor every 0.1 seconds, and calculate the efficiency and heat generated by the motor based on these data, and then adjust the working state of the cooling water pump or other control actions based on these calculation results. The selection of the preset scheduling cycle has an important impact on the response speed and control accuracy of the system, and needs to be reasonably set according to the actual application requirements and system performance. The motor efficiency table can be a pre-defined table that contains the theoretical efficiency values ​​of the motor at different working points (such as different torque and speed combinations). Motor efficiency is the efficiency of the motor in converting electrical energy into mechanical energy. It is an important parameter to measure motor performance and is usually expressed as a percentage. The higher the efficiency value, the less loss the motor has when converting energy. The operating voltage can be the voltage across the motor when it is working. These electrical parameters are directly related to the power consumption of the motor and are key factors in calculating the heat generated by the motor. Combining these parameters, the efficiency of the current operating point can be queried through the motor efficiency table, and then combined with electrical parameters such as operating voltage and current, the heat generated by the motor at the current moment can be calculated. This is an important step in motor thermal management. The specific formula can be:

[0066]

[0067] in Refers to the heat generated by the motor at the current moment, V refers to the operating voltage, and I refers to the operating current. Refers to the current motor efficiency, Refers to the preset scheduling period.

[0068] Specifically, this example involves obtaining the current torque and speed of the motor in real time, using this data to query the motor efficiency table to determine the current efficiency of the motor, and then combining the motor's operating voltage, operating current, and preset scheduling cycle to calculate the heat generated by the motor at the current moment. The preset scheduling cycle refers to the time interval for the control system to update and process data. The data collected during this cycle is used to evaluate the thermal state of the motor and perform thermal management accordingly to ensure that the motor runs at a safe temperature. In short, this is a continuous monitoring and evaluation process used to dynamically grasp the thermal load of the motor and make corresponding control decisions in a timely manner.

[0069] As an example, the amount of heat dissipated by the motor through the motor casing at the current moment is obtained according to the operating parameters of the motor, including: obtaining the thermal conductivity coefficient, the first heat correction parameter, the average internal and external temperature difference of the motor casing at the current moment, the surface area of ​​the motor casing and a preset scheduling period; based on the average internal and external temperature of the motor casing at the current moment, the surface area of ​​the motor casing, the preset scheduling period and the thermal conductivity coefficient and the first heat correction parameter, the amount of heat dissipated by the motor through the motor casing at the current moment is obtained.

[0070] Among them, the thermal conductivity coefficient is a physical parameter used to describe the strength of the material's thermal conductivity. In the thermal management of the motor, the thermal conductivity coefficient refers to a measure of the thermal conductivity of the motor housing material, which affects the efficiency of heat transfer from the inside of the motor to the outside of the housing. The first heat correction parameter is a parameter that may be adjusted according to the specific motor design and operating conditions, and is used to correct the difference between the theoretical calculation and the actual heat dissipation. It may include consideration of factors such as the surface condition of the motor housing and environmental conditions. The average internal and external temperature difference of the motor housing at the current moment refers to the difference between the internal temperature of the motor housing and the external ambient temperature at a specific moment. This difference directly affects the rate at which heat is transferred from the inside of the motor through the housing to the external environment. The surface area of ​​the motor housing refers to the total external surface area of ​​the motor housing, through which heat is transferred from the inside of the motor to the external environment. The calculation formula can be:

[0071]

[0072] Where Q2 refers to the heat dissipation of the motor through the motor housing at the current moment, L1 refers to the first heat correction parameter, k refers to the thermal conductivity, A refers to the surface area of ​​the motor housing, Refers to the average temperature difference between the inside and outside of the motor housing at the current moment. Refers to the preset scheduling period.

[0073] Specifically, this example involves collecting parameters such as the thermal conductivity coefficient of the motor housing, the first heat correction parameter, the current internal and external temperature difference, the housing surface area, and the preset scheduling cycle. These data are then used to calculate the heat dissipated by the motor through its housing to the external environment at the current moment through a specific heat transfer formula, that is, the heat dissipation of the motor housing. This calculation result is crucial for evaluating the thermal state of the motor and designing an effective cooling system. It is a process of quantitatively analyzing the heat dissipation performance of the motor housing based on physical parameters and actual measurements.

[0074] As an example, the heat dissipation of the motor through water cooling at the current moment is obtained according to the operating parameters of the motor, including: obtaining a second heat correction parameter, the current inlet and outlet water temperature difference and specific heat value and a preset scheduling cycle; based on the second heat correction parameter, the current inlet and outlet water temperature difference and the specific heat value and the preset scheduling cycle, the heat dissipation of the motor through water cooling at the current moment is obtained.

[0075] Among them, the second heat correction parameter is an adjustment parameter used to take into account the difference between the actual operation of the water cooling system and the theoretical model. It may include corrections for factors such as water flow, pipeline efficiency, and heat exchanger performance to ensure that the calculated heat dissipation is closer to the actual situation. The current inlet and outlet temperature difference refers to the temperature difference between the water inlet and outlet of the motor cooling system at a specific moment. This temperature difference directly reflects the degree of heat absorbed by the cooling water when it flows through the motor, and is an important basis for calculating the heat dissipation. The specific heat capacity value refers to the amount of heat required to increase or decrease the unit mass of a substance by 1 degree Celsius. In the water cooling system of the motor, the specific heat capacity usually refers to the specific heat capacity of the coolant (such as water), which determines the amount of heat that a unit volume of coolant can absorb or release when the temperature changes. The calculation result reflects the total amount of heat dissipated by the motor through the water cooling system in a given time period. The calculation formula can be:

[0076]

[0077] Among them, Q3 refers to the heat dissipation of the motor through water cooling at the current moment, L2 refers to the second heat correction parameter, C refers to the specific heat capacity value, and △T2 refers to the temperature difference between the inlet and outlet of the water at the current moment.

[0078] Specifically, this example collects key parameters of the water cooling system, including the second heat correction parameter, the temperature difference between the water inlet and outlet of the motor cooling system at the current moment, the specific heat capacity of the coolant, and the preset scheduling cycle, and then uses these parameters to calculate the heat dissipated by the motor through the water cooling system at the current moment through thermodynamic formulas, that is, the water cooling heat dissipation of the motor. This calculation result is crucial for evaluating the thermal management efficiency of the motor and optimizing the cooling system design. It is a process of quantitatively analyzing the water cooling heat dissipation performance of the motor based on actual operating data and physical properties.

[0079] Step S30, obtaining the residual heat of the motor within a preset time according to the heat currently generated by the motor, the heat dissipated by the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment;

[0080] It should be noted that the residual heat of the motor within the preset time can be the heat accumulated inside the motor within the preset time range. This parameter is calculated by comprehensively considering the heat generated by the motor at the current moment, the heat dissipated through the motor housing, and the heat dissipated through the water cooling system. Specifically, it involves the steps of heat generation, heat loss, and heat accumulation to obtain the residual heat accumulated inside the motor within the preset time period. This residual heat is a key parameter for evaluating the thermal state of the motor and formulating a cooling strategy.

[0081] It can be understood that by calculating the net heat gain of the motor at the current moment (i.e., the heat generated minus the heat dissipated through the housing and the water cooling system), and combining it with a preset time range, predicting the accumulated heat inside the motor at the end of the time period, it can help predict the temperature state of the motor after a specific time period, thereby preventing overheating and ensuring that the motor operates within a safe temperature range.

[0082] Step S40, controlling the cooling water pump using a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time.

[0083] It should be noted that the current temperature of the motor refers to the actual temperature of the motor at a certain moment. The cooling water pump control strategy refers to adjusting the operating state of the cooling water pump (such as turning it on, off or adjusting the operating power) according to the temperature and heat load of the motor to maintain the motor within a suitable operating temperature range, prevent overheating and protect the motor. The cooling water pump is the main component for conveying cooling water in the closed-loop cooling system of the automobile engine. Its performance directly affects the power and economy of the automobile, as well as the life of the entire machine.

[0084] It is understandable that, based on the real-time monitored temperature of the motor and the predicted thermal load of the motor in the future, the working state of the cooling water pump is intelligently adjusted (such as turning on, off or adjusting the power) to ensure that the motor remains within a safe operating temperature range and prevent performance degradation or damage due to overheating. This control strategy can dynamically respond to the thermal needs of the motor, optimize cooling efficiency, extend the life of the motor, and improve the energy efficiency of the entire system.

[0085] As an example, the cooling water pump is controlled by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time, including: obtaining a preset first temperature threshold, a preset second temperature threshold, a preset first heat threshold and a preset second heat threshold; if the current temperature of the motor is greater than the preset first temperature threshold or the residual heat of the motor within the preset time is greater than the preset first heat threshold, the cooling water pump uses the first preset operating power; if the current temperature of the motor is less than the preset second temperature threshold and the residual heat of the motor within the preset time is less than the preset second heat threshold, the cooling water pump is turned off; if the current temperature of the motor and the residual heat of the motor within the preset time do not meet the above conditions, the cooling water pump uses the second preset operating power.

[0086] Among them, the preset first temperature threshold is an upper limit value of the motor temperature. When the actual motor temperature exceeds this value, it indicates that the motor temperature is too high and needs to be enhanced cooling. The preset second temperature threshold is a lower limit value of the motor temperature. When the actual motor temperature is lower than this value, it indicates that the motor temperature is low and may not require additional cooling or can reduce cooling. The preset first heat threshold is an upper limit value of the residual heat of the motor within a preset time. When the residual heat of the motor exceeds this value, it indicates that the motor heat load is large and needs to be enhanced cooling. The preset second heat threshold is a lower limit value of the residual heat of the motor within a preset time. When the residual heat of the motor is lower than this value, it indicates that the motor heat load is small and may not require additional cooling or can reduce cooling. The first preset operating power is the operating power of the cooling water pump when the maximum cooling effect is required. When the motor temperature or residual heat exceeds the corresponding first threshold, the cooling water pump will operate at this power to quickly reduce the motor temperature. The second preset operating power is the operating power of the cooling water pump when the cooling demand is medium. When the motor temperature and residual heat are between the two thresholds, the conditions for turning on the maximum power cooling and not turning off the cooling water pump are not met, the cooling water pump will operate at this power. Through this control strategy, the cooling intensity can be intelligently adjusted according to the actual thermal state of the motor, which not only ensures the safe operation of the motor but also improves the energy efficiency and economy of the cooling system.

[0087] Specifically, the example describes a cooling water pump control strategy based on motor temperature and heat thresholds, wherein a preset first temperature threshold and a preset first heat threshold are used to determine when enhanced cooling is required, and a preset second temperature threshold and a preset second heat threshold are used to determine when cooling can be reduced or stopped. Specifically, if the current temperature of the motor exceeds the preset first temperature threshold or the residual heat within the preset time exceeds the preset first heat threshold, it indicates that the motor needs more cooling, and the cooling water pump will run at the first preset operating power (maximum or higher power). On the contrary, if the current temperature of the motor is lower than the preset second temperature threshold and the residual heat is lower than the preset second heat threshold, it indicates that the motor does not require additional cooling, and the cooling water pump will be turned off. If the temperature or residual heat of the motor is between these two thresholds, the cooling water pump will run at the second preset operating power (medium power) to adapt to the medium cooling needs of the motor. This strategy can intelligently adjust the cooling intensity according to the actual thermal state of the motor, which not only protects the motor from overheating damage, but also improves energy efficiency.

[0088] As an example, before controlling the cooling water pump using a corresponding cooling water pump control strategy based on the current temperature of the motor and the residual heat of the motor within a preset time, it also includes: obtaining a preset voltage interval, a preset current interval, a preset phase current interval, a preset third temperature threshold and the current temperature of the motor; if the operating voltage exceeds the preset voltage interval, the operating current exceeds the preset current interval, the operating phase current exceeds the preset phase current interval, and the current temperature of the motor exceeds any one of the preset third temperature threshold, the motor is turned off.

[0089] Among them, the preset voltage interval is a safe voltage range set for the operation of the motor. The motor should operate within this range to ensure its normal operation and avoid damage due to excessively high or low voltage. The preset current interval is a safe current range set for the operation of the motor. The operating current of the motor should be within this range to ensure that the motor does not fail due to overload or underload. The preset phase current interval means that for a three-phase motor, this is the safe range that the current of each phase should be maintained. This interval ensures that the current of each phase is within the safe range to avoid damage caused by unbalanced load. The preset third temperature threshold is the maximum temperature value allowed when the motor is running. Exceeding this temperature may cause damage to the motor, such as demagnetization or degradation of insulation materials. The operating phase current is the actual current of each phase in a three-phase motor. In a three-phase motor, the balance of phase currents is critical to the performance and life of the motor.

[0090] Specifically, this example describes a motor safety protection mechanism that involves preset safe operating ranges for voltage, current, and phase current, as well as a preset maximum allowable temperature threshold. When the motor's operating voltage, current, phase current, and actual operating temperature are continuously monitored, if any of these parameters exceeds their respective preset safety ranges, the motor is considered to be in a potentially dangerous state, and the system will automatically shut down the motor to protect it from damage. This is a preventive measure that ensures that the motor can be shut down in time when it exceeds safe operating parameters to avoid possible damage.

[0091] This embodiment provides a motor protection method. This embodiment first obtains the operating parameters of the motor to accurately calculate the heat generated by the motor at the current moment, the heat dissipated through the motor housing, and the heat dissipated through the water cooling system. These data provide a basis for evaluating the thermal state of the motor. Then, combined with these heat dissipations and generated heat, the residual heat of the motor within a preset time can be predicted, which is crucial for evaluating the thermal load and potential overheating risks of the motor. Finally, according to the current temperature of the motor and the residual heat within the preset time, the corresponding cooling water pump control strategy is adopted to effectively adjust the operation of the cooling water pump to keep the motor within a suitable operating temperature range. This embodiment realizes real-time monitoring and intelligent control of the motor temperature, thereby optimizing the thermal management of the motor, improving the reliability and service life of the motor, and ensuring the safety and performance of new energy vehicles.

[0092] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 2 , Figure 2 This is a flow chart of the second embodiment of the motor protection method of the present application. Step S30 of the motor protection method includes steps S31 to S33:

[0093] Step S31, obtaining the preset time step number;

[0094] It should be noted that the preset number of time steps refers to the number of smaller time intervals (or steps) into which the total preset time is divided in order to obtain the thermal state of the motor at a certain point in time when performing motor thermal management calculations. Each time step is equally spaced and is used to calculate the heat generated, heat dissipated, and residual heat of the motor at these discrete time points.

[0095] It can be understood that the preset number of time steps refers to the number of equally spaced smaller time units into which the total preset time period is divided in order to control the thermal state of the motor at a certain point in time when performing motor thermal management calculations. These time units are used to calculate the heat generated, heat dissipated and residual heat, etc. by the motor, so as to perform thermal management and cooling control more accurately.

[0096] Step S32, obtaining a preset time based on the preset time step number and the preset scheduling period;

[0097] It is understandable that determining the preset time based on the number of preset time steps and the preset scheduling cycle means dividing the total preset time (i.e., the total time period in which we want to obtain the thermal state of the motor) according to a certain time interval (preset scheduling cycle) to obtain the number of such time steps contained in the entire preset time. For example, if the preset time is set to 1 minute (60 seconds) and the preset scheduling cycle is 0.2 seconds, the number of preset time steps is 30. The preset scheduling cycle is usually 0.02S-0.2S, then the preset time can be changed by changing the number of preset time steps, that is, changing the frequency of calculating the residual heat.

[0098] Step S33, obtaining the residual heat of the motor within the preset time according to the heat currently generated by the motor, the heat dissipated by the motor housing at the current moment, the heat dissipated by the motor through water cooling at the current moment, and the preset time.

[0099] It is understood that the thermal state of the motor at the current moment, including the heat it generates, the heat dissipated through the housing, and the heat dissipated through the water cooling system, combined with a preset time period (preset time), is used to calculate the remaining heat inside the motor at the end of this time period. This process involves predicting the thermal dynamics of the motor to evaluate the thermal load and heat dissipation effect of the motor in a given time period, thereby obtaining the thermal accumulation of the motor, which is crucial for formulating the cooling strategy of the motor and ensuring that it operates at a safe temperature. The calculation formula can be:

[0100]

[0101] Where Q refers to the remaining heat of the motor within the preset time, t refers to the current moment, and n refers to the preset time step. It refers to the preset scheduling cycle, Q1 refers to the heat generated by the motor at the current moment, Q2 refers to the heat dissipated by the motor through the motor housing at the current moment, and Q3 refers to the heat dissipated by the motor through water cooling at the current moment.

[0102] This embodiment first determines the number of preset time steps. Then, using the time step and the preset scheduling cycle, calculate the preset time, that is, the total time period for which you want to predict the thermal state of the motor. Finally, combined with the heat currently generated by the motor, the heat dissipated through the housing and the water cooling system, and the preset time, the residual heat of the motor within the preset time can be derived, that is, the heat accumulated inside the motor. This calculation result is crucial for predicting the thermal load of the motor and formulating corresponding cooling strategies. It can help understand the temperature state of the motor in a specific time period, so as to adjust the cooling measures in time to ensure that the motor operates within a safe temperature range and avoid performance degradation or damage caused by overheating. This embodiment realizes accurate prediction and dynamic management of the thermal state of the motor, and improves the reliability and efficiency of the motor.

[0103] For example, in order to help understand the implementation process of the motor protection method obtained by combining this embodiment with the above-mentioned embodiment 1, please refer to Figure 3 , Figure 3 A brief flow chart of a motor protection method is provided, specifically:

[0104] First, the operating parameters of the motor are obtained, and then the heat currently generated by the motor, the heat dissipated through the housing and the water cooling system are calculated, and then the residual heat within the preset time is obtained. Based on this data, combined with the preset temperature and heat thresholds, different control strategies are used to adjust the operating power of the cooling water pump to keep the motor working within a safe temperature range. Before controlling the cooling water pump, the voltage, current and temperature of the motor are also checked to see if they exceed the safety threshold. If so, the motor is shut down to prevent damage. This is a comprehensive process of monitoring and controlling the motor temperature to ensure its safe and efficient operation.

[0105] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the motor protection method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0106] This application also provides a motor protection device, please refer to Figure 4 , the motor protection device comprises:

[0107] An acquisition module 10 is used to acquire the operating parameters of the motor;

[0108] An obtaining module 20 is used to obtain the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor;

[0109] The calculation module 30 is used to obtain the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment;

[0110] The control module 40 is used to control the cooling water pump by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time.

[0111] The motor protection device provided by the present application adopts the motor protection method in the above embodiment, and can solve the technical problem of how to effectively control the motor temperature by intelligently controlling the cooling water pump. Compared with the prior art, the beneficial effects of the motor protection device provided by the present application are the same as the beneficial effects of the motor protection method provided by the above embodiment, and other technical features in the motor protection device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0112] The present application provides a motor protection device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the motor protection method in the above-mentioned embodiment one.

[0113] Reference below Figure 5 , which shows a schematic diagram of the structure of a motor protection device suitable for implementing the embodiment of the present application. The motor protection device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The motor protection device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0114] like Figure 5As shown, the motor protection device may include a processing device 1001 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the motor protection device are also stored. The processing device 1001, ROM1002, and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the motor protection device to communicate with other devices wirelessly or by wire to exchange data. Although the figure shows a motor protection device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0115] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0116] The motor protection device provided by the present application adopts the motor protection method in the above embodiment, which can solve the technical problem of how to effectively control the motor temperature by intelligently controlling the cooling water pump. Compared with the prior art, the beneficial effects of the motor protection device provided by the present application are the same as the beneficial effects of the motor protection method provided by the above embodiment, and other technical features in the motor protection device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0117] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0118] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0119] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the motor protection method in the above-mentioned embodiment.

[0120] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0121] The computer-readable storage medium may be included in the motor protection device; or may exist independently without being assembled into the motor protection device.

[0122] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the motor protection device, the motor protection device: obtains the operating parameters of the motor; obtains the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor; obtains the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment; and controls the cooling water pump using a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within the preset time.

[0123] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0124] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0125] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0126] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned motor protection method, and can solve the technical problem of how to effectively control the motor temperature by intelligently controlling the cooling water pump. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the motor protection method provided in the above-mentioned embodiment, and will not be elaborated here.

[0127] The present application also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps of the motor protection method as described above are implemented.

[0128] The computer program product provided in this application can solve the technical problem of how to effectively control the temperature of the motor by intelligently controlling the cooling water pump. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the motor protection method provided in the above embodiment, which will not be repeated here.

[0129] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A motor protection method, characterized in that: The method comprises: Get the operating parameters of the motor; According to the operating parameters of the motor, the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment are obtained; According to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment, the residual heat of the motor within a preset time is obtained; Controlling the cooling water pump using a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time; The controlling of the cooling water pump by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time includes: Obtaining a preset first temperature threshold, a preset second temperature threshold, a preset first heat threshold, and a preset second heat threshold; If the current temperature of the motor is greater than the preset first temperature threshold or the residual heat of the motor within a preset time is greater than the preset first heat threshold, the cooling water pump uses the first preset operating power; If the current temperature of the motor is lower than the preset second temperature threshold and the residual heat of the motor within a preset time is lower than the preset second heat threshold, the cooling water pump is turned off; If the current temperature of the motor and the residual heat of the motor within a preset time do not meet the above conditions, the cooling water pump uses a second preset operating power.

2. The method according to claim 1, characterized in that The step of obtaining the heat generated by the motor at a current moment according to the operating parameters of the motor includes: Get the current torque, current speed and preset scheduling cycle of the motor; Based on the current torque and the current speed, query a motor efficiency table to obtain a current motor efficiency; Based on the operating voltage, the operating current, the preset scheduling period and the current motor efficiency, the heat generated by the motor at the current moment is obtained.

3. The method according to claim 1, characterized in that The step of obtaining the heat dissipated by the motor through the motor housing at the current moment according to the operating parameters of the motor includes: Obtaining the heat transfer coefficient, the first heat correction parameter, the average internal and external temperature difference of the motor housing at the current moment, the surface area of ​​the motor housing, and the preset scheduling period; Based on the average internal and external temperatures of the motor housing at the current moment, the surface area of ​​the motor housing, the preset scheduling period, the thermal conductivity coefficient and the first heat correction parameter, the amount of heat dissipated by the motor through the motor housing at the current moment is obtained.

4. The method according to claim 1, characterized in that The step of obtaining the amount of heat dissipated by the motor through water cooling at a current moment according to the operating parameters of the motor includes: Obtain the second heat correction parameter, the current inlet and outlet temperature difference and specific heat value, and the preset scheduling cycle; Based on the second heat correction parameter, the inlet and outlet temperature difference at the current moment, the specific heat capacity and the preset scheduling period, the heat dissipation of the motor through water cooling at the current moment is obtained.

5. The method according to claim 1, characterized in that The method of obtaining the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment comprises: Get the preset number of time steps; Based on the preset number of time steps and the preset scheduling period, a preset time is obtained; The residual heat of the motor within the preset time is obtained according to the heat currently generated by the motor, the heat dissipated by the motor housing at the current moment, the heat dissipated by the motor through water cooling at the current moment, and the preset time.

6. The method according to claim 1, characterized in that Before the cooling water pump is controlled by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time, the method further includes: Acquire a preset voltage interval, a preset current interval, a preset phase current interval, a preset third temperature threshold, and a current temperature of the motor; If the operating voltage exceeds the preset voltage range, the operating current exceeds the preset current range, the operating phase current exceeds the preset phase current range, and the current temperature of the motor exceeds any one of the preset third temperature thresholds, the motor is turned off.

7. A motor protection device, characterized in that: The device comprises: An acquisition module is used to acquire the operating parameters of the motor; An obtaining module, used for obtaining the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment according to the operating parameters of the motor; A calculation module, used for obtaining the residual heat of the motor within a preset time according to the heat generated by the motor at the current moment, the heat dissipated by the motor through the motor housing at the current moment, and the heat dissipated by the motor through water cooling at the current moment; A control module, used to control the cooling water pump by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time; the control of the cooling water pump by adopting a corresponding cooling water pump control strategy according to the current temperature of the motor and the residual heat of the motor within a preset time includes: obtaining a preset first temperature threshold, a preset second temperature threshold, a preset first heat threshold and a preset second heat threshold; if the current temperature of the motor is greater than the preset first temperature threshold or the residual heat of the motor within the preset time is greater than the preset first heat threshold, the cooling water pump uses a first preset operating power; if the current temperature of the motor is less than the preset second temperature threshold and the residual heat of the motor within the preset time is less than the preset second heat threshold, the cooling water pump is turned off; if the current temperature of the motor and the residual heat of the motor within the preset time do not meet the above conditions, the cooling water pump uses a second preset operating power.

8. A motor protection device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the motor protection method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the motor protection method according to any one of claims 1 to 6 are implemented.

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