Method and device for determining output power of motor under short-time working system, electronic equipment and storage medium

Abstract

The invention provides a method and device for determining the output power of a motor under a short-time working system, electronic equipment and a storage medium. The method for determining the output power of the motor under the short-time working system comprises the steps of obtaining the output power and loss of the motor under a continuous working system; determining a heating time constant of the motor according to the loss of the motor under the continuous working system; according to the loss of the motor under the continuous working system and the heating time constant, determining a mapping relation between the allowable loss of the motor under the short-time working system and the operation duration; and determining the output power of the motor under the short-time working system according to the output power and the variable loss of the motor under the continuous working system, the operation duration of the motor under the short-time working system, the invariable loss of the motor and the mapping relation. According to the scheme, the efficiency of determining the output power of the motor under the short-time working system can be improved.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering technology, and in particular to a method, device, electronic equipment and storage medium for determining the output power of a motor under short-time operation. Background Art

[0002] According to the operating mode, the motor's duty cycle includes continuous duty (S1 duty cycle) and short-time duty (S2 duty cycle). S1 duty cycle means that the motor runs continuously under a constant load until it reaches a thermally stable state, and there is no need to stop for cooling. S2 duty cycle means that the motor runs under a constant load for a period of time, which is not enough time for the motor to reach thermal stability, and then it needs to stop for cooling. The motor is designed according to the S1 duty cycle by default, but application scenarios such as cranes and valve controllers require the motor to operate under the S2 duty cycle. Since the motor runs for a short time under the S2 duty cycle, the output power of the motor can be increased to improve the utilization rate of the motor. However, excessively high output power will increase the risk of burning the motor. Therefore, it is necessary to determine the output power of the motor under the S2 duty cycle.

[0003] Currently, the output power of the motor under S2 working mode is determined by thermal simulation method.

[0004] However, when determining the output power of the motor under the S2 working mode through thermal simulation, it is necessary to determine multiple simulation parameters, design optimization directions, create simulation scenarios, etc., resulting in low efficiency in determining the output power of the motor under the S2 working mode. Summary of the Invention

[0005] In view of this, the method, device, electronic device and storage medium for determining the output power of a motor under short-time working mode provided by the present invention can improve the efficiency of determining the output power of a motor under short-time working mode.

[0006] According to a first aspect of an embodiment of the present invention, a method for determining the output power of a motor under a short-time working mode is provided, comprising: obtaining the output power and loss of the motor under a continuous working mode; determining a heating time constant of the motor based on the loss of the motor under a continuous working mode; determining a mapping relationship between the allowable loss and the operating time of the motor under a short-time working mode based on the loss of the motor under a continuous working mode and the heating time constant; determining the output power of the motor under a short-time working mode based on the output power and variable loss of the motor under a continuous working mode, the operating time of the motor under a short-time working mode, the constant loss of the motor and the mapping relationship.

[0007] In a first possible implementation, in combination with the first aspect above, determining the heating time constant of the motor based on the loss of the motor under continuous working mode includes: obtaining multiple temperature rise test data of the motor, the temperature rise test data including the running time and corresponding temperature rise of the motor under continuous working mode, different temperature rise test data corresponding to different running time; determining the heating time constant of the motor based on the loss of the motor under continuous working mode and the multiple temperature rise test data.

[0008] In a second possible implementation, in combination with the first possible implementation, determining the heating time constant of the motor based on the loss data of the motor under continuous operation and the multiple temperature rise test data includes: determining a temperature rise curve based on the multiple temperature rise test data, the temperature rise curve being used to indicate the corresponding relationship between the operating time and temperature rise of the motor under continuous operation; fitting the following first formula to the temperature rise curve to obtain the heating time constant of the motor; the first formula includes:

[0009]

[0010] Δθ is used to characterize the temperature rise of the motor under continuous working mode, t1 is used to characterize the running time of the motor under continuous working mode, Q1 is used to characterize the loss of the motor under continuous working mode, α is used to characterize the heat dissipation coefficient of the motor, A is used to characterize the surface heat dissipation area of ​​the motor, e is used to characterize the natural constant, and T is used to characterize the heating time constant of the motor.

[0011] In a third possible implementation, in combination with the first aspect, determining the mapping relationship between the allowable loss and the operating time of the motor under short-time working mode based on the loss of the motor under continuous working mode and the heating time constant includes: determining the mapping relationship between the allowable loss and the operating time of the motor under short-time working mode as the following second formula based on the loss of the motor under continuous working mode and the heating time constant; the second formula includes:

[0012]

[0013] Q2 is used to characterize the allowable loss of the motor under short-time working mode, Q1 is used to characterize the loss of the motor under continuous working mode, e is used to characterize the natural constant, t2 is used to characterize the running time of the motor under short-time working mode, and T is used to characterize the heating time constant of the motor.

[0014] In a fourth possible implementation, in combination with the third possible implementation, the output power of the motor under the short-time working system is determined according to the output power and variable loss of the motor under the continuous working system, the running time of the motor under the short-time working system, the constant loss of the motor, and the mapping relationship, including: calculating the first alternative output power of the motor under the short-time working system according to the output power and variable loss of the motor under the continuous working system, the running time of the motor under the short-time working system, the constant loss of the motor, and the mapping relationship by the following third formula; determining the output power of the motor under the short-time working system according to the first alternative output power; the third formula includes:

[0015]

[0016] P S2 It is used to indicate the first alternative output power of the motor under short-time working mode, P S1 Used to indicate the output power of the motor under continuous working mode, F e Used to indicate the constant loss of the motor, CU S1 Used to indicate the variable loss of the motor under continuous operation.

[0017] In a fifth possible implementation, in combination with the fourth possible implementation, determining the output power of the motor under the short-time working mode based on the first alternative output power includes: determining the first alternative output power as the output power of the motor under the short-time working mode.

[0018] In a sixth possible implementation, in combination with the fourth possible implementation, determining the output power of the motor under the short-time working mode according to the first alternative output power includes: calculating the second alternative output power of the motor under the short-time working mode according to the maximum output torque of the motor under the continuous working mode and the output torque of the motor under the short-time working mode by the following fourth formula; determining the smaller one of the first alternative output power and the second alternative output power as the output power of the motor under the short-time working mode; the fourth formula includes:

[0019]

[0020] P′ S2 It is used to characterize the second alternative output power of the motor under short-time working mode, T N It is used to characterize the rated output torque of the motor under continuous duty, T M It is used to represent the maximum output torque of the motor under continuous operation.

[0021] According to a second aspect of an embodiment of the present invention, a device for determining the output power of a motor under a short-time working mode is provided, comprising: an acquisition unit for acquiring the output power and loss of the motor under a continuous working mode; a first calculation unit for determining the heating time constant of the motor based on the loss of the motor under a continuous working mode; a mapping unit for determining a mapping relationship between the allowable loss and the operating time of the motor under a short-time working mode based on the loss of the motor under a continuous working mode and the heating time constant; a second calculation unit for determining the output power of the motor under a short-time working mode based on the output power and variable loss of the motor under a continuous working mode, the operating time of the motor under a short-time working mode, the constant loss of the motor and the mapping relationship.

[0022] In a third aspect, an embodiment of the present invention further provides an electronic device comprising: a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other through the communication bus; the memory is used to store at least one executable instruction, and the executable instruction enables the processor to perform operations corresponding to the method for determining the output power of a motor under short-time working mode provided in the first aspect or any possible implementation of the first aspect.

[0023] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which computer instructions are stored. When the computer instructions are executed by a processor, the processor executes a method for determining the output power of a motor under short-time working mode as provided in the first aspect or any possible implementation of the first aspect.

[0024] In a fifth aspect, an embodiment of the present invention further provides a computer program product, which is tangibly stored on a computer-readable medium and includes computer-executable instructions, which, when executed, enable at least one processor to execute a method for determining the output power of a motor under short-time working mode as provided in the first aspect or any possible implementation of the first aspect.

[0025] As can be seen from the above technical solution, during the motor design process, the motor will be subjected to type testing. Through type testing, the output power, loss, variable loss, and constant loss of the motor under continuous operation can be obtained. Based on the loss of the motor under continuous operation, the heating time constant of the motor can be determined. Then, based on the loss and heating time constant of the motor under continuous operation, the mapping relationship between the allowable loss and operating time of the motor under short-time operation can be determined. Then, based on the output power and variable loss of the motor under continuous operation, the operating time of the motor under short-time operation, and the constant loss of the motor and the above mapping relationship, the output power of the motor under short-time operation can be determined. Based on the multiple data obtained from the motor type test, the output power of the motor under short-time operation is determined by calculation, without the need for time-consuming processes such as determining simulation parameters, designing optimization directions, and creating simulation scenarios. This shortens the time required to determine the output power of the motor under short-time operation, thereby improving the efficiency of determining the output power of the motor under short-time operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a flow chart of a method for determining output power of a motor under short-time operation according to an embodiment of the present invention;

[0027] Figure 2 1 is a schematic diagram of a temperature rise curve according to an embodiment of the present invention;

[0028] Figure 3 2 is a schematic diagram of a device for determining output power of a motor under short-time operation according to an embodiment of the present invention;

[0029] Figure 4 FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present invention.

[0030] List of reference numerals:

[0031] 100: Method for determining output power of a motor under short-time operation; 101-104: Method steps; 300: Apparatus for determining output power of a motor under short-time operation; 301: Acquisition unit; 302: First calculation unit; 303: Mapping unit; 304: Second calculation unit; 400: Electronic device; 402: Processor; 404: Communication interface; 406: Memory; 408: Communication bus; 410: Program. DETAILED DESCRIPTION

[0032] As mentioned above, the motor can also operate according to the continuous duty system (S1 duty system) or short-time duty system (S2 duty system) to cope with different application scenarios. The motor is designed according to the S1 duty system by default. When the motor designed according to the S1 duty system is applied to cranes, valve control and other fields and operates at the S2 duty system, it is necessary to determine the output power of the motor under the S2 duty system to determine whether the motor can meet the usage requirements. Currently, the output power of the motor under the S2 duty system is determined by thermal simulation. However, thermal simulation requires determining multiple simulation parameters, designing optimization directions, creating simulation scenarios, etc., resulting in low efficiency in determining the output power of the motor under the S2 duty system.

[0033] In an embodiment of the present invention, during the motor design process, a type test is performed when the prototype is finalized. The type test can obtain the output power, allowable loss, and variable loss of the motor under the S1 working mode, and the constant loss of the motor can be obtained. The motor's heating time constant can be determined based on the allowable loss of the motor under the S1 working mode. Then, based on the allowable loss and heating time constant of the motor under the S1 working mode, the mapping relationship between the allowable loss and the running time of the motor under the S2 working mode can be determined. Then, based on the output power and variable loss of the motor under the S1 working mode, the running time of the motor under the S2 working mode, the constant loss of the motor, and the above mapping relationship, the output power of the motor under the S2 working mode can be determined. It can be seen that based on the various data obtained through the type test, the output power of the motor under the S2 working mode can be determined by calculation. Compared with determining the output power of the motor under the S2 working mode through thermal simulation, the time required to determine the output power of the motor under the S2 working mode is shortened, thereby improving the efficiency of determining the output power of the motor under the S2 working mode.

[0034] The following describes in detail the method, device, and electronic device for determining the output power of a motor under short-time operation mode provided by the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that, for ease of description, the continuous operation mode is described as S1 operation mode and the short-time operation mode is described as S2 operation mode in the subsequent embodiments.

[0035] Figure 1 FIG1 is a flow chart showing a method for determining the output power of a motor under short-time operation according to an embodiment of the present invention. Figure 1 As shown, the method 100 for determining the output power of a motor under short-time working mode includes the following steps:

[0036] Step 101: Obtain the output power and loss of the motor under the S1 working mode.

[0037] Motors are designed for S1 duty and undergo type testing during prototype finalization. This testing provides information on various motor parameters, including output power and losses under S1 duty. The losses in S1 duty indicate the motor's heat output under S1 duty. Motor heat generation stems from losses, which are converted into heat.

[0038] Step 102: Determine the heating time constant of the motor based on the loss of the motor under the S1 working mode.

[0039] A motor's thermal time constant is a parameter that describes the dynamics of its temperature rise. It refers to the time required for the temperature to reach 63.2% of its stable value under certain power consumption conditions. The thermal time constant's physical nature reflects the system's thermal inertia: the greater the heat capacity or the lower the heat dissipation efficiency, the slower the temperature rise and the larger the thermal time constant.

[0040] When conducting type tests on motors, the temperature rise of the motor under the S1 operating mode can be obtained. The temperature rise of the motor under the S1 operating mode is related to the loss and heating time constant. After obtaining the loss and temperature rise of the motor under the S1 operating mode, the heating time constant of the motor can be determined.

[0041] Step 103 : Determine a mapping relationship between the allowable loss and the running time of the motor under the S2 working mode according to the loss and heating time constant of the motor under the S1 working mode.

[0042] The steady-state temperature rise of a motor under S1 duty is related to the motor's losses under S1 duty. That is, the steady-state temperature rise of a motor can be expressed using a mathematical formula that includes the motor's losses under S1 duty. The temperature rise of a motor under S2 duty is related to the motor's allowable losses, operating time, and thermal time constant under S2 duty. That is, the temperature rise of a motor under S2 duty can be expressed using a mathematical formula that includes the motor's allowable losses, operating time, and thermal time constant under S2 duty.

[0043] In order to ensure that the windings of the motor will not burn due to high temperature when running under the S2 working mode, the upper limit of the temperature rise of the motor under the S2 working mode is set to be equal to the steady-state temperature rise of the motor under the S1 working mode, thereby constructing a mathematical relationship between the motor loss under the S1 working mode and the allowable loss, operating time and heating time constant of the motor under the S2 working mode. Since the motor loss and heating time constant under the S1 working mode are known, the mapping relationship between the allowable loss and operating time of the motor under the S2 working mode can be determined.

[0044] Step 104 : Determine the output power of the motor under the S2 operating mode according to the output power and variable loss of the motor under the S1 operating mode, the running time of the motor under the S2 operating mode, the constant loss of the motor, and the mapping relationship.

[0045] The motor loss is divided into variable loss and constant loss. The constant loss does not change with the change of motor power. This part of the loss can be separated out, and the output power of the motor under the S2 working mode can be determined based on the relationship between variable loss and current, and the relationship between power and current.

[0046] The motor's output power and variable losses under S1 duty, as well as its constant losses, can be obtained through type testing. The motor's operating time under S2 duty is a known requirement. Substituting the motor's operating time under S2 duty into the mapping relationship, the motor's allowable losses under S2 duty can be calculated. Furthermore, based on the motor's output power and variable losses under S1 duty, the motor's constant losses, and the motor's allowable losses under S2 duty, the motor's output power under S2 duty can be determined.

[0047] In an embodiment of the present invention, a type test is performed on the motor during the motor design process. The output power, loss, variable loss, and constant loss of the motor under the S1 working mode can be obtained through the type test. The heating time constant of the motor can be determined based on the loss of the motor under the S1 working mode. Then, based on the loss and heating time constant of the motor under the S1 working mode, the mapping relationship between the allowable loss and the running time of the motor under the S2 working mode can be determined. Then, based on the output power and variable loss of the motor under the S1 working mode, the running time of the motor under the S2 working mode, and the constant loss of the motor and the above mapping relationship, the output power of the motor under the S2 working mode can be determined. Based on the multiple data obtained by performing type tests on the motor, the output power of the motor under the S2 working mode is determined by calculation, without the need for time-consuming processes such as determining simulation parameters, designing optimization directions, and creating simulation scenarios. This shortens the time required to determine the output power of the motor under the S2 working mode, thereby improving the efficiency of determining the output power of the motor under the S2 working mode.

[0048] In one possible implementation, to determine the motor's heating time constant, multiple temperature-rise test data sets can be obtained. These test data sets include the motor's operating time and the corresponding temperature rise under the S1 operating mode, with different temperature-rise test data sets corresponding to different operating times. The motor's heating time constant can then be determined based on the motor's losses under the S1 operating mode and the multiple temperature-rise test data sets obtained.

[0049] When conducting type tests on motors, multiple temperature rise test data when the motor is running under the S1 working mode can be obtained, and the losses of the motor under the S1 working mode can be obtained. Then, the heating time constant of the motor can be determined based on the multiple temperature rise test data and the losses of the motor under the S1 working mode.

[0050] The temperature rise of a motor when running under the S1 duty system is related to the motor's losses, operating time, and heating time constant under the S1 duty system. The temperature rise test data includes the temperature rise and operating time, and the motor's losses under the S1 duty system are known. Therefore, the heating time constant can be calculated based on the temperature rise test data and the motor's losses under the S1 duty system.

[0051] In an example, assuming that the motor starts working from a cold state, the functional relationship corresponding to the heating curve of the motor under the S1 working mode is shown in the following formula (1):

[0052]

[0053] Δθ is the temperature rise of the motor under S1 working mode, Δθ ∞ is the steady-state temperature rise of the motor under S1 duty, t1 is the running time of the motor under S1 duty, Q1 is the loss of the motor under S1 duty, α is the heat dissipation coefficient of the motor, A is the surface heat dissipation area of ​​the motor, e is the natural constant, and T is the heating time constant of the motor. Under S1 duty, since the motor and load remain unchanged, the loss of the motor remains unchanged.

[0054] Table 1 below shows a number of temperature rise test data obtained through type tests.

[0055] Table 1

[0056] Temperature rise test data serial number Run time (s) Temperature rise (℃) 1 10 5 2 20 12 3 30 17 4 40 21 5 50 24

[0057] After substituting the motor's loss Q1 under the S1 operating mode, the motor's heat dissipation coefficient α, the motor's surface heat dissipation area A, and the natural constant e into the above formula (1), the unknowns included in formula (1) are Δθ, t1, and T. Substituting the temperature rise test data included in Table 1 into formula (1), the heating time constant T can be solved. In one embodiment, the heating time constant T can be solved separately through each temperature rise test data, and then the average value of the heating time constants T solved through multiple temperature rise test data can be determined as the heating time constant of the motor.

[0058] In an embodiment of the present invention, a plurality of temperature rise test data of the motor can be obtained through type testing. The temperature rise test data includes the operating time and corresponding temperature rise of the motor under the S1 working mode. Then, the heating time constant of the motor can be determined based on the temperature rise test data and the loss of the motor under the S1 working mode, thereby ensuring the accuracy of the obtained heating time constant. Since the type test is performed during the motor design, it is not performed solely for determining the output power of the motor under the S1 working mode. The heating time constant of the motor is determined directly based on the results of the type test, thereby ensuring the efficiency of obtaining the heating time constant.

[0059] In one possible implementation, after obtaining multiple temperature-rise test data for a motor, a temperature-rise curve can be determined based on the temperature-rise test data. The temperature-rise curve can indicate the corresponding relationship between the motor's operating time and temperature rise under the S1 operating mode. After obtaining the temperature-rise curve, the temperature-rise curve is fitted with the above formula (1) to obtain the motor's heating time constant.

[0060] After obtaining multiple temperature rise test data of the motor, a temperature rise curve of the motor under the S1 working mode is drawn according to the obtained multiple temperature rise test data. The horizontal axis of the temperature rise curve is the running time of the motor, and the vertical axis of the temperature rise curve is the temperature rise of the motor. Figure 2 A schematic diagram of a temperature rise curve of an embodiment of the present invention is shown, wherein the abscissa t1 represents the running time of the motor under the S1 working mode, and the ordinate Δθ represents the temperature rise of the motor under the S1 working mode.

[0061] Since the temperature rise and running time of the motor under the S1 working mode satisfy the relationship shown in the above formula (1), and the temperature rise curve also indicates the corresponding relationship between the temperature rise and the running time, the temperature rise curve is the curve corresponding to the above formula (1). Then, the above formula (1) can be fitted with the temperature rise curve to solve T in formula (1), that is, to obtain the heating time constant of the motor.

[0062] In an embodiment of the present invention, a temperature rise curve is drawn based on a plurality of temperature rise test data. The temperature rise curve is a curve corresponding to formula (1). Formula (1) is fitted with the temperature rise curve to obtain the heating time constant of the motor. By fitting formula (1) with the temperature rise curve to determine the heating time constant, the heating time constant can be determined based on a plurality of temperature rise test data, so that the obtained heating time constant is consistent with the actual situation of the motor, thereby ensuring the accuracy of the determined heating time constant.

[0063] In one possible implementation, in order to ensure that the motor does not burn out due to overheating under the S2 working mode, the upper limit of the temperature rise of the motor under the S2 working mode is limited to be equal to the steady-state temperature rise of the motor under the S1 working mode. Based on this, the mapping relationship between the allowable loss and the operating time of the motor under the S2 working mode can be determined according to the loss and heating time constant of the motor under the S1 working mode. The mapping relationship is shown in the following formula (2):

[0064]

[0065] In the above formula (2), Q2 is used to characterize the allowable loss of the motor under the S2 working mode, Q1 is used to characterize the loss of the motor under the S1 working mode, e is used to characterize the natural constant, t2 is used to characterize the running time of the motor under the S2 working mode, and T is used to characterize the heating time constant of the motor.

[0066] Steady-state temperature rise of the motor under S1 working mode Q1 is the loss of the motor under S1 duty, α is the heat dissipation coefficient of the motor, A is the surface heat dissipation area of ​​the motor, α and A are known constants. The temperature rise of the motor under S2 duty Q2 is the allowable loss of the motor under S2 working mode, e is the natural constant, T is the heating time constant of the motor, and t2 is the running time of the motor under S2 working mode.

[0067] Let Δθ ∞ =Δθ2, that is, the steady-state temperature rise of the motor under S1 working mode is equal to the upper limit of the temperature rise of the motor under S2 working mode. Therefore, the mapping relationship between the allowable loss Q2 and the running time t2 of the motor under S2 working mode can be determined as follows:

[0068] In an embodiment of the present invention, in order to ensure that the motor does not burn due to overheating under the S2 working system, the upper limit of the temperature rise of the motor under the S2 working system is equal to the stable temperature rise of the motor under the S1 working system. The steady-state temperature rise of the motor under the S1 working system can be determined according to the loss of the motor under the S1 working system. The temperature rise of the motor under the S2 working system can be represented by the allowable loss, operating time and heating time constant of the motor under the S2 working system. Since the loss and heating time constant of the motor under the S1 working system are known, the mapping relationship between the allowable loss and operating time of the motor under the S2 working system can be determined as follows: Based on the running time of the motor in the S2 working mode and the mapping relationship, the allowable loss of the motor in the S2 working mode can be determined to ensure that the motor will not burn out when running according to the output power calculated based on the allowable loss.

[0069] In one possible implementation, since the running time of the motor under the S2 working mode is a known required value, the allowable loss of the motor under the S2 working mode can be calculated based on the mapping relationship between the allowable loss of the motor under the S2 working mode and the running time. Then, based on the allowable loss of the motor under the S2 working mode, the power that the motor can output under the S2 working mode can be deduced, that is, the output power of the motor under the S2 working mode can be deduced.

[0070] The motor loss is divided into two parts: variable loss and constant loss. The constant loss does not change with the change of motor power, so the constant loss of the motor under S1 and S2 working conditions is equal. Assume that the loss of the motor under S1 working condition is Q1 = CU S1 +F e The allowable loss of the motor under S2 working mode is Q2=CU S2 +F e , CU S1is the variable loss of the motor under S1 working mode, CU S2 is the variable loss of the motor under S2 working mode, F e is the constant loss of the motor, which is approximately equal to the no-load loss of the motor. By performing type tests on the motor, CU S1 and F e , that is, when calculating the output power of the motor under S2 working mode, CU S1 and F e Known.

[0071] Assume that the output power of the motor under S1 working mode is P S1 , the first alternative output power of the motor under S2 working mode is P S2 , the current of the motor under S1 working mode is I S1 , the current of the motor under S2 working mode is I S2 , then there exists and therefore

[0072] According to Q2=CU S2 +F e CU available S2 =Q2-F e ,so The mapping relationship between the allowable loss and the running time of the motor under S2 working mode is: so Then Substitution The first alternative output power P of the motor under S2 working mode can be obtained. S2 The following formula (3):

[0073]

[0074] In the above formula (3), P S1 , CU S1 , Q1 and F e The heating time constant T can be obtained by performing a type test on the motor. The heating time constant T can be calculated by the method in the above embodiment. e is a natural constant. The running time t2 of the motor under the S2 working system is a known demand. Therefore, when calculating P S2 When P S1 , CU S1 ,Q1,F e , T, e and t2 are all known, so the first alternative output power P of the motor under S2 working mode can be calculated by the above formula (3): S2 .

[0075] After obtaining the first alternative output power of the motor under the S2 working mode, the power that the motor can output under the S2 working mode is determined according to the first alternative output power, that is, the output power of the motor under the S2 working mode is determined according to the first alternative output power.

[0076] In an embodiment of the present invention, after obtaining the output power and variable loss of the motor under the S1 working mode, the operating time of the motor under the S2 working mode, the mapping relationship between the allowable loss and the operating time of the motor under the S2 working mode, and the constant loss and heating time constant of the motor, the first alternative output power of the motor under the S2 working mode is calculated according to these data using the above formula (3), and then the output power of the motor under the S2 working mode can be determined based on the first alternative output power. Compared with determining the output power of the motor under the S2 working mode by thermal simulation, determining the output power of the motor under the S2 working mode by calculation improves the efficiency of determining the output power of the motor under the S2 working mode.

[0077] In one possible implementation, after calculating the first alternative output power of the motor under the S2 working mode, the first alternative output power is directly determined as the output power of the motor under the S2 working mode, that is, the power that the motor can output under the S2 working mode is determined to be the first alternative output power.

[0078] In an embodiment of the present invention, after calculating the first alternative output power, the first alternative output power is directly determined as the output power of the motor under the S2 working mode. While ensuring that the motor will not burn out when operating according to the calculated output power, the efficiency of determining the output power of the motor under the S2 working mode is guaranteed.

[0079] In a possible implementation, according to the maximum output torque T of the motor in the S1 working mode M and rated output torque T N The second alternative output power P′ of the motor under S2 working mode can be calculated by the following formula (4): S2 :

[0080]

[0081] T N and T M Both can be obtained by conducting type tests on the motor.

[0082] While preventing a motor designed for S1 duty from burning out when running under S2 duty, it is also necessary to consider the torque capacity that the motor can output. M / T NThe maximum torque multiple of the motor under the S1 working mode is taken into consideration. From the aspect of the motor output torque, the ratio of the motor output power under the S2 working mode to the output power under the S1 working mode is determined through research and experiments. It cannot exceed the ratio of the maximum torque multiple to 1.6. According to this relationship, the critical output power of the motor under the S2 working mode can be calculated by the above formula (4), and this critical output power is used as the second alternative output power P′ of the motor under the S2 working mode. S2 , that is, the output power of the motor under S2 working mode needs to be less than or equal to the second alternative output power P' S2 .

[0083] After calculating the second alternative output power P′ S2 Then, the first alternative output power P S2 and the second alternative output power P′ S2 Compare and select the first alternative output power P S2 and the second alternative output power P′ S2 The smaller one is used as the output power of the motor under S2 working mode.

[0084] In an embodiment of the present invention, the second alternative output power is calculated based on the torque output capacity of the motor, and then the smaller of the first alternative output power and the second alternative output power is used as the output power of the motor under the S2 working mode, so that the motor will not burn due to overheating when it operates under the S2 working mode according to the output power under the S2 working mode, and at the same time ensure that the motor can output sufficient torque to achieve the output power under the S2 working mode.

[0085] In an example, Table 2 below shows the temperature rise of the same motor when it is running under S1 duty and S2 duty.

[0086] Table 2

[0087]

[0088] As shown in Table 2 above, the steady-state temperature rise of the motor when running at 90 kW power under the S1 working mode is 76.4K. The motor operates according to the output power determined by the method provided by the embodiment of the present invention under the S2 working mode. It can be seen that the temperature rise of the motor operating under the S2 working mode is less than the steady-state temperature rise of the motor under the S1 working mode, indicating that the output power determined by the method provided by the embodiment of the present invention can operate normally under the S2 working mode, that is, the method provided by the embodiment of the present invention can accurately calculate the output power of the motor under the S2 working mode.

[0089] Figure 3 FIG. 1 is a schematic diagram of a device for determining output power of a motor under short-time operation according to an embodiment of the present invention. Figure 3As shown, the output power determination device 300 of the motor under short-time working mode includes:

[0090] An acquisition unit 301 is used to acquire the output power and loss of the motor under continuous operation;

[0091] The first calculation unit 302 is used to determine the heating time constant of the motor according to the loss of the motor under continuous operation;

[0092] A mapping unit 303 is configured to determine a mapping relationship between the allowable loss and the operating time of the motor under short-time operation according to the loss and heating time constant of the motor under continuous operation;

[0093] The second calculation unit 304 is used to determine the output power of the motor under the short-time working mode according to the output power and variable loss of the motor under the continuous working mode, the running time of the motor under the short-time working mode, the constant loss of the motor and the mapping relationship.

[0094] In an embodiment of the present invention, a type test is performed on the motor during the motor design process. The output power, loss, variable loss and constant loss of the motor under the S1 working mode can be obtained through the type test. After the acquisition unit 301 acquires the output power and loss of the motor under the S1 working mode, the first calculation unit 302 can determine the heating time constant of the motor based on the loss of the motor under the S1 working mode. Then, the mapping unit 303 can determine the mapping relationship between the allowable loss and the running time of the motor under the S2 working mode based on the loss and heating time constant of the motor under the S1 working mode. Then, the second calculation unit 304 can determine the output power of the motor under the S2 working mode based on the output power and variable loss of the motor under the S1 working mode, the running time of the motor under the S2 working mode, and the constant loss of the motor and the above-mentioned mapping relationship. Based on multiple data obtained from type tests on the motor, the output power of the motor under the S2 working mode is determined by calculation. There is no need to go through time-consuming processes such as determining simulation parameters, designing optimization directions, and creating simulation scenarios. This shortens the time required to determine the output power of the motor under the S2 working mode, thereby improving the efficiency of determining the output power of the motor under the S2 working mode.

[0095] It should be noted that the interaction between the various parts of the above-mentioned device for determining the output power of the motor under short-time working mode is based on the same concept as the above-mentioned embodiment of the method for determining the output power of the motor under short-time working mode. The specific content and beneficial effects can be found in the description of the embodiment of the method for determining the output power of the motor under short-time working mode, and will not be repeated here.

[0096] Figure 4 This is a schematic diagram of an electronic device provided by an embodiment of the present invention. The specific embodiment of the present invention does not limit the specific implementation of the electronic device. Figure 4 The electronic device 400 provided by the embodiment of the present invention includes: a processor 402, a communication interface 404, a memory 406, and a communication bus 408. Among them:

[0097] The processor 402 , the communication interface 404 , and the memory 406 communicate with each other via a communication bus 408 .

[0098] The communication interface 404 is used to communicate with other electronic devices or servers.

[0099] The processor 402 is configured to execute the program 410 , and specifically to execute the relevant steps in the embodiment of the method for determining the output power of a motor under short-time operation.

[0100] Specifically, the program 410 may include program codes, which include computer operation instructions.

[0101] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of the present invention. The one or more processors included in a smart device may be processors of the same type, such as one or more CPUs, or processors of different types, such as one or more CPUs and one or more ASICs.

[0102] The memory 406 is used to store the program 410. The memory 406 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0103] The program 410 can be specifically used to enable the processor 402 to execute the method for determining the output power of the motor under the short-time working mode in any of the aforementioned embodiments.

[0104] The specific implementation of each step in program 410 can be found in the corresponding descriptions of the corresponding steps and units in the embodiment of the method for determining the output power of a motor under short-time operation, and will not be repeated here. Those skilled in the art will clearly understand that for the convenience and brevity of description, the specific working processes of the above-described devices and modules can refer to the corresponding process descriptions in the above-described method embodiment, and will not be repeated here.

[0105] Through the electronic device of this embodiment, the motor will be type tested during the motor design process. Through the type test, the output power, loss, variable loss and constant loss of the motor under the S1 working mode can be obtained. The heating time constant of the motor can be determined based on the loss of the motor under the S1 working mode. Then, based on the loss and heating time constant of the motor under the S1 working mode, the mapping relationship between the allowable loss and the running time of the motor under the S2 working mode can be determined. Then, based on the output power and variable loss of the motor under the S1 working mode, the running time of the motor under the S2 working mode, and the constant loss of the motor and the above mapping relationship, the output power of the motor under the S2 working mode can be determined. Based on the multiple data obtained by performing type tests on the motor, the output power of the motor under the S2 working mode is determined by calculation, without the need for time-consuming processes such as determining simulation parameters, designing optimization directions, and creating simulation scenarios. This shortens the time required to determine the output power of the motor under the S2 working mode, thereby improving the efficiency of determining the output power of the motor under the S2 working mode.

[0106] The present invention also provides a computer-readable storage medium storing instructions for causing a machine to execute the method for determining the output power of a motor under short-duration operation as described herein. Specifically, a system or device equipped with a storage medium can be provided, wherein the storage medium stores software program code that implements the functions of any of the above-described embodiments, and a computer (or CPU or MPU) of the system or device can read and execute the program code stored in the storage medium.

[0107] In this case, the program code itself read from the storage medium can realize the function of any one of the above-mentioned embodiments, and thus the program code and the storage medium storing the program code constitute part of the present invention.

[0108] Examples of storage media for providing program code include floppy disks, hard disks, magneto-optical disks, optical disks (such as CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD+RW), magnetic tapes, non-volatile memory cards, and ROMs. Alternatively, the program code can be downloaded from a server computer via a communication network.

[0109] In addition, it should be clear that the functions of any of the above embodiments can be achieved not only by executing the program code read by the computer, but also by enabling the operating system operating on the computer to complete part or all of the actual operations based on the instructions of the program code.

[0110] In addition, it can be understood that the program code read from the storage medium is written into a memory provided in an expansion board inserted into the computer or into a memory provided in an expansion module connected to the computer, and then based on the instructions of the program code, a CPU installed on the expansion board or expansion module is enabled to perform part or all of the actual operations, thereby realizing the functions of any of the above embodiments.

[0111] An embodiment of the present invention further provides a computer program product, tangibly stored on a computer-readable medium and comprising computer-executable instructions. When executed, the computer-executable instructions cause at least one processor to perform the method for determining the output power of a motor under short-duration operation provided in the aforementioned embodiments. It should be understood that each solution in this embodiment has the corresponding technical effects of the aforementioned method embodiments and will not be further elaborated here.

[0112] It should be noted that not all steps and modules in the above processes and system structure diagrams are required, and certain steps or modules can be omitted according to actual needs. The execution order of each step is not fixed and can be adjusted as needed. The system structure described in the above embodiments can be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by multiple physical entities, or may be implemented by certain components in multiple independent devices.

[0113] Nouns and pronouns referring to persons in this patent application are not limited to a specific gender.

[0114] In the above embodiments, the hardware module can be implemented mechanically or electrically. For example, a hardware module can include a permanent dedicated circuit or logic (such as a dedicated processor, FPGA or ASIC) to complete the corresponding operation. The hardware module can also include programmable logic or circuits (such as a general-purpose processor or other programmable processors), which can be temporarily set by software to complete the corresponding operation. The specific implementation method (mechanical method, or dedicated permanent circuit, or temporarily set circuit) can be determined based on cost and time considerations.

[0115] The present invention has been shown and described in detail above through the accompanying drawings and preferred embodiments. However, the present invention is not limited to these disclosed embodiments. Based on the above multiple embodiments, those skilled in the art can know that the code review methods in the above different embodiments can be combined to obtain more embodiments of the present invention, and these embodiments are also within the scope of protection of the present invention.

Claims

1. A method (100) for determining the output power of a motor under short-time operation, characterized in that: include: Obtain the output power and loss of the motor under continuous operation; Determining a heating time constant of the motor according to the loss of the motor under continuous operation; Determining a mapping relationship between allowable loss and operating time of the motor under short-time working mode according to the loss of the motor under continuous working mode and the heating time constant; The output power of the motor under the short-time working mode is determined according to the output power and variable loss of the motor under the continuous working mode, the running time of the motor under the short-time working mode, the constant loss of the motor and the mapping relationship.

2. The method according to claim 1, characterized in that Determining the heating time constant of the motor according to the loss of the motor under continuous operation includes: Acquire a plurality of temperature rise test data of the motor, wherein the temperature rise test data include the running time and the corresponding temperature rise of the motor under a continuous working mode, and different temperature rise test data correspond to different running time; The heating time constant of the motor is determined according to the loss of the motor under continuous operation and the plurality of temperature rise test data.

3. The method according to claim 2, characterized in that The step of determining the heating time constant of the motor according to the loss data of the motor under the continuous working mode and the plurality of temperature rise test data comprises: Determining a temperature rise curve according to the plurality of temperature rise test data, wherein the temperature rise curve is used to indicate a corresponding relationship between the operating time and the temperature rise of the motor under a continuous working mode; Fitting the following first formula to the temperature rise curve to obtain the heating time constant of the motor; The first formula includes: Δθ is used to characterize the temperature rise of the motor under continuous working mode, t1 is used to characterize the running time of the motor under continuous working mode, Q1 is used to characterize the loss of the motor under continuous working mode, α is used to characterize the heat dissipation coefficient of the motor, A is used to characterize the surface heat dissipation area of ​​the motor, e is used to characterize the natural constant, and T is used to characterize the heating time constant of the motor.

4. The method according to claim 1, wherein Determining a mapping relationship between the allowable loss and the operating time of the motor under short-time working mode according to the loss of the motor under continuous working mode and the heating time constant includes: According to the loss of the motor under continuous operation and the heating time constant, a mapping relationship between the allowable loss and the operating time of the motor under short-time operation is determined as the following second formula; The second formula includes: Q2 is used to characterize the allowable loss of the motor under short-time working mode, Q1 is used to characterize the loss of the motor under continuous working mode, e is used to characterize the natural constant, t2 is used to characterize the running time of the motor under short-time working mode, and T is used to characterize the heating time constant of the motor.

5. The method according to claim 4, characterized in that Determining the output power of the motor under the short-time working mode according to the output power and variable loss of the motor under the continuous working mode, the running time of the motor under the short-time working mode, the constant loss of the motor, and the mapping relationship includes: Calculate the first candidate output power of the motor in the short-time working mode by the following third formula based on the output power and variable loss of the motor in the continuous working mode, the operating time of the motor in the short-time working mode, the constant loss of the motor, and the mapping relationship; Determining the output power of the motor under short-time working mode according to the first alternative output power; The third formula includes: P S2 It is used to indicate the first alternative output power of the motor under short-time working mode, P S1 Used to indicate the output power of the motor under continuous working mode, F e Used to indicate the constant loss of the motor, CU S1 Used to indicate the variable loss of the motor under continuous operation.

6. The method according to claim 5, characterized in that The step of determining the output power of the motor under the short-time working mode according to the first alternative output power includes: The first alternative output power is determined as the output power of the motor under the short-time working mode.

7. The method according to claim 5, characterized in that The step of determining the output power of the motor under the short-time working mode according to the first alternative output power includes: According to the maximum output torque of the motor in the continuous working mode and the output torque of the motor in the short-time working mode, the second alternative output power of the motor in the short-time working mode is calculated by the following fourth formula; Determining the smaller one of the first alternative output power and the second alternative output power as the output power of the motor under the short-time working mode; The fourth formula includes: P′ S2 It is used to characterize the second alternative output power of the motor under short-time working mode, T N It is used to characterize the rated output torque of the motor under continuous duty, T M It is used to represent the maximum output torque of the motor under continuous operation.

8. A device (300) for determining output power of a motor under short-time operation, characterized in that: include: An acquisition unit (301) is used to acquire the output power and loss of the motor under continuous operation; A first calculation unit (302) is used to determine a heating time constant of the motor according to the loss of the motor under continuous operation; A mapping unit (303) is used to determine a mapping relationship between the allowable loss and the operating time of the motor under short-time working mode according to the loss of the motor under continuous working mode and the heating time constant; The second calculation unit (304) is used to determine the output power of the motor under the short-time working mode according to the output power and variable loss of the motor under the continuous working mode, the running time of the motor under the short-time working mode, the constant loss of the motor and the mapping relationship.

9. An electronic device (400), characterized in that include: A processor (402), a communication interface (404), a memory (406), and a communication bus (408), wherein the processor (402), the memory (406), and the communication interface (404) communicate with each other via the communication bus (408); The memory (406) is used to store at least one executable instruction, wherein the executable instruction enables the processor (402) to perform operations corresponding to the method for determining the output power of a motor under short-time operation according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, which, when executed by a processor, enable the processor to perform the method according to any one of claims 1 to 7.

11. A computer program product, characterized in that The computer program product is tangibly stored on a computer-readable medium and comprises computer-executable instructions which, when executed, cause at least one processor to perform the method according to any one of claims 1-7.

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