Permanent magnet synchronous motor temperature rise heat dissipation analysis method based on multi-field coupling technology

Abstract

The invention discloses a permanent magnet synchronous motor temperature rise heat dissipation analysis method based on the multi-field coupling technology. The method comprises the first step of carrying out the analysis of electromagnetic loss by the establishment of an electromagnetic field model of an electric machine to obtain the copper loss on a coil, the iron loss of an iron core and the eddy-current loss of permanent magnet materials, the second step of establishing a fluid solid strong coupling conjugate heat conduction model of the structural temperature field analysis and the fluid heat dissipation analysis of the electric machine, the third step of establishing a bothway weak coupling model of the electromagnetic loss and the fluid solid strong coupling conjugate heat conduction analysis, and the fourth step of achieving the convergence of a single physical model and the convergence of the load transferring between the electromagnetic field model and the fluid solid strong coupling conjugate heat conduction model by the adaptation of a repetitive cycle iterative method, wherein if the condition of the convergence meets the condition set by a user, the coupling is balanced, and the computing process is finished. The permanent magnet synchronous motor temperature rise heat dissipation analysis method integrates the advantages of the strong coupling and the weak coupling, the temperature rise and the heat dissipation process when the electric machine works are precisely simulated in a unified software platform, the stability of the convergence in the process of computing is enhanced, and computing precision and computing efficiency are improved.

Description

technical field [0001] The invention relates to the field of simulation technology, specifically a coupling analysis technology applicable to permanent magnet synchronous motors for new energy vehicles or other industrial permanent magnet synchronous motors for electromagnetic heat generation-heat conduction-fluid cooling. The invention can effectively improve the performance of motors. The analysis accuracy of temperature rise and heat dissipation, and optimize the analysis of motor design. Background technique [0002] With the increasingly serious non-renewable energy crisis and the increasing threat of environmental problems to human survival, the design and production of hybrid or electric vehicles that replace petroleum have become the focus of attention in various countries. As the main difference between new power vehicles and traditional fuel vehicles, the motor drive device is undoubtedly the key to the successful design of new energy vehicles. The temperature dis...

AI Technical Summary

Problems solved by technology

Specifically, first solve the coolant under the assumed fluid-solid coupling interface temperature condition, obtain the approximate heat dissipation coefficient and temperature distribution of the fluid-solid coupling interface, and then use the result as the input boundary condition of the thermal analysis of the motor for quasi-static analysis, In this way, the temperature continuity and energy conservation of the coupling interface cannot be guaranteed, which affects the accuracy of the temperature rise and heat dissipation analysis, thereby affecting the reliability of the motor design

Images