Temperature field-thermal circuit direct coupling-based motor heat analysis method

Abstract

The invention discloses a temperature field and thermal circuit direct coupling-based motor heat analysis method. Part of parts of a motor are modeled by adopting a finite element method, and other parts are modeled by adopting a thermal circuit method. A temperature field is related to a thermal circuit through an equivalent temperature boundary and an equivalent convection boundary. During solving, a thermal circuit part is regarded to consist of one-dimensional finite element units, and two connected boundaries are regarded as two boundary units. Finally a unit stiffness matrix, a unit load matrix, a unit mass matrix and the like corresponding to the one-dimensional finite element units and the boundary units are superposed to a global stiffness matrix, a global load matrix and a global mass matrix, and the temperature field and the temperature distribution in the thermal circuit are worked out at the same time through a method for solving a global linear equation set. According to the method, the advantages of the finite element method and the thermal circuit method in the motor heat analysis are combined, so that sufficient calculation precision can be ensured and the calculation speed can be remarkably increased.

Description

technical field [0001] The invention relates to the field of finite element thermal analysis, in particular to a motor thermal analysis method directly coupled with a temperature field and a thermal circuit. Background technique [0002] With the intensification of the energy crisis, the society's demand for high-efficiency and low-cost motors continues to increase. Accurate motor design not only needs to calculate the electromagnetic performance of the motor, but also needs to accurately calculate the temperature rise of the motor during operation to ensure its safe operation. The traditional motor temperature rise calculation is mainly based on the thermal circuit method. This method usually only calculates the average temperature rise of the winding, and the establishment of the thermal circuit model and the calibration of parameters need to be combined with experiments. With the appearance of the finite element method and the rapid development of computer technology, ma...

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Problems solved by technology

Pure thermal path modeling can only represent the average temperature of each component, and there are errors when modeling components with complex geometric structures and uneven heat source distribution

However, the traditional finite element modeling method cannot simulate the convective heat transfer inside the fully enclosed motor, such as the convective heat transfer between the end winding and the casing and the convective heat transfer between the stator and the rotor. Large scale, long calculation time

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