CN-121980118-A - Motor stator temperature determining method, system, equipment and medium

CN121980118ACN 121980118 ACN121980118 ACN 121980118ACN-121980118-A

Abstract

The application discloses a method, a system, equipment and a medium for determining the temperature of a motor stator, and relates to the technical field of temperature detection; the method comprises the steps of analyzing three-phase current, determining a heat treatment strategy for a stator of the three-phase motor, adjusting the temperature of the stator based on the three-phase current and the heat treatment strategy to obtain a target temperature rise temperature, and calculating the temperature based on the target temperature rise temperature to obtain the target temperature of the stator. According to the application, simulation data is not needed to be relied on, and the dynamic performance of the motor is not influenced, so that the difficulty in determining the temperature of the stator can be reduced.

Inventors

ZHANG ZIMO
ZHANG ZHUYA
LI BANGLONG
LIU XUDONG
DONG YUE
GAO KAIQIANG

Assignees

辰致科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251222

Claims (10)

1. A method of determining a temperature of a stator of an electric machine, comprising: acquiring three-phase current of a three-phase motor; analyzing based on the three-phase current, determining a heat treatment strategy for a stator of the three-phase motor; Based on the three-phase current and the heat treatment strategy, carrying out temperature adjustment on the stator to obtain a target temperature rise temperature; and carrying out temperature calculation based on the target temperature rise temperature to obtain the target temperature of the stator.
2. The method of claim 1, wherein the three-phase currents include an a-phase current, a B-phase current, and a C-phase current, wherein the determining a heat treatment strategy for a stator of the three-phase motor based on the analysis of the three-phase currents comprises: screening out the maximum effective current from the A-phase current, the B-phase current and the C-phase current; When the maximum effective current is smaller than or equal to a preset motor heat accumulation current, determining a heat treatment strategy for the stator as a heat dissipation strategy; And when the maximum effective current is larger than the motor heat accumulation current, determining a heat treatment strategy for the stator of the three-phase motor as an endothermic heat dissipation strategy.
3. The method of claim 1, wherein the temperature adjusting the stator based on the three-phase current and the heat treatment strategy to obtain a target temperature rise temperature comprises: when the heat treatment strategy is a heat radiation strategy, performing simulated heat radiation treatment on the stator according to the heat radiation strategy to obtain a first current total heat accumulation; and searching a target temperature rise temperature matched with the first current total heat accumulation from a preset first heat temperature rise table.
4. The method of claim 1, wherein the temperature adjusting the stator based on the three-phase current and the heat treatment strategy to obtain a target temperature rise temperature comprises: when the heat treatment strategy is an endothermic heat dissipation strategy, according to the endothermic heat dissipation strategy, carrying out simulated heat dissipation on the stator based on the three-phase current to obtain a second current total heat accumulation; performing table lookup operation based on the second current total heat accumulation and the three-phase current to obtain a target temperature rise coefficient; Integrating based on the second current total heat accumulation and the target temperature rise coefficient to obtain actual heat accumulation; And searching a target temperature rise temperature matched with the actual heat accumulation from a preset temperature rise temperature table.
5. The method of claim 4, wherein the three-phase current comprises an A-phase current, a B-phase current, and a C-phase current, and wherein when the thermal treatment strategy is an endothermic heat dissipation strategy, performing an analog heat dissipation treatment on the stator based on the three-phase current according to the endothermic heat dissipation strategy to obtain a second current total heat accumulation comprises: screening out the maximum effective current from the A-phase current, the B-phase current and the C-phase current; acquiring motor heat accumulation current of the three-phase motor; when the heat treatment strategy is an endothermic heat dissipation strategy, calculating based on the maximum effective current and the motor heat accumulation current by utilizing a preset current formula according to the endothermic heat dissipation strategy to obtain a heat load coefficient; and performing simulated heat dissipation treatment on the stator based on the thermal load coefficient to obtain a second current total heat accumulation.
6. The method of claim 4, wherein the three-phase current comprises an A-phase current, a B-phase current, and a C-phase current, wherein performing a look-up operation based on the second current total heat accumulation and the three-phase current to obtain a target temperature rise coefficient comprises: screening out the maximum effective current from the A-phase current, the B-phase current and the C-phase current; Searching a target thermal saturation degree matched with the maximum effective current from a preset thermal saturation degree table; Searching a first temperature rise temperature matched with the second current total heat accumulation from a preset second heat temperature rise table; And searching a target temperature rise coefficient matched with the maximum effective current, the first temperature rise temperature and the target thermal saturation degree from a preset temperature rise coefficient table.
7. The method according to any one of claims 1 to 6, wherein the calculating a temperature based on the target temperature rise temperature to obtain a target temperature of the stator includes: acquiring the ambient temperature of the environment where the stator is located; and determining the sum of the ambient temperature and the target temperature rise temperature as the target temperature of the stator.
8. A motor stator temperature determination system, comprising: The acquisition module is used for acquiring three-phase currents of the three-phase motor; A strategy determination module for determining a heat treatment strategy for a stator of the three-phase motor based on the analysis of the three-phase current; The temperature adjusting module is used for adjusting the temperature of the stator based on the three-phase current and the heat treatment strategy to obtain a target temperature rise temperature; And the temperature determining module is used for carrying out temperature calculation based on the target temperature rise temperature to obtain the target temperature of the stator.
9. A computing device comprising a memory, a processor and a program stored on the memory and running on the processor, wherein the processor, when executing the program, implements the steps of a method of determining the temperature of a stator of an electric machine as claimed in any one of claims 1 to 7.
10. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein instructions, which when run on a terminal device, cause the terminal device to perform the steps of a method for determining the temperature of a stator of an electric machine according to any of claims 1 to 7.

Description

Motor stator temperature determining method, system, equipment and medium Technical Field The present application relates to the field of temperature detection technologies, and in particular, to a method, a system, an apparatus, and a medium for determining a temperature of a motor stator. Background There are several methods for estimating the stator of the motor, including thermal model method, stator resistance estimation method, neural network estimation method, etc. More recently, thermal modeling and electronic resistance estimation methods have been used to estimate the temperature of the stator of an electric machine. Both of these approaches have their own advantages as well as their policy, resource and algorithm deficiencies. For example, the calculation of the resource requirements by using the thermal model method is large and depends on simulation data, so that the calculation is difficult to be carried out without the support of electromagnetic simulation direction professionals, software and other resources. The electronic resistance estimation method is used, the resistance information is indirectly extracted through high-frequency signal injection or harmonic analysis, the influence of load change and skin effect is easy, the dynamic performance of the motor is influenced, and the method is not suitable for scenes with high requirements on the dynamic performance. Therefore, the existing motor stator temperature estimation method depends on simulation data or influences the dynamic performance of the motor, so that the difficulty in determining the stator temperature is high. Disclosure of Invention The application provides a method, a system, equipment and a medium for determining the temperature of a motor stator, which are used for solving the problem that the difficulty in determining the temperature of the stator is high because the existing method for estimating the temperature of the motor stator depends on simulation data or affects the dynamic performance of the motor. In order to solve the above technical problems, the present application provides a method for determining a temperature of a stator of an electric machine, including: acquiring three-phase current of a three-phase motor; Analyzing based on the three-phase current, determining a heat treatment strategy for a stator of the three-phase motor; Based on the three-phase current and the heat treatment strategy, carrying out temperature adjustment on the stator to obtain a target temperature rise temperature; and carrying out temperature calculation based on the target temperature rise temperature to obtain the target temperature of the stator. In a second aspect, the present application also provides a motor stator temperature determination system, comprising: The acquisition module is used for acquiring three-phase currents of the three-phase motor; The strategy determining module is used for analyzing based on the three-phase current and determining a heat treatment strategy for a stator of the three-phase motor; The temperature adjusting module is used for adjusting the temperature of the stator based on the three-phase current and the heat treatment strategy to obtain a target temperature rise temperature; and the temperature determining module is used for carrying out temperature calculation based on the target temperature rise temperature to obtain the target temperature of the stator. In a third aspect, the present application also provides a computing device comprising a memory, a processor and a program stored on the memory and running on the processor, the processor implementing the steps of a method for determining the temperature of a stator of an electric machine as described above when the program is executed by the processor. In a fourth aspect, the present application also provides a computer readable storage medium having instructions stored therein which, when executed on a terminal device, cause the terminal device to perform the steps of a method for determining the temperature of a stator of an electric motor. The method has the advantages that firstly, the three-phase current of the three-phase motor is analyzed, the heat treatment strategy for the stator of the three-phase motor is determined, and the temperature of the stator is adjusted based on the three-phase current and the heat treatment strategy, so that the target temperature rise temperature obtained by temperature adjustment is matched with the current thermal dynamic performance of the three-phase motor, and the accuracy of the target temperature rise temperature is improved. Then, temperature calculation is carried out based on the target temperature rise temperature, so that the target temperature of the stator is obtained, simulation data is not required to be relied on, dynamic performance is not affected, difficulty in determining the temperature of the stator can be reduced, and accuracy of the target temperature can be improved. Dr