Abstract
The paper justifies the validity of analyzing the impact of temperature and the process of partial demagnetization of magnets on the operating parameters of machines. To analyze this impact, a field model of coupled electromagnetic and thermal phenomena in a permanent magnet synchronous motor was proposed. The non-linearity of the magnetic circuit, the effect of temperature on the magnetic, electrical and thermal properties of the materials as well as the developed method of modeling the process of partial demagnetization of the magnet were taken into account. Based on this model, an algorithm and software were developed to analyze the effect of temperature and the process of partial demagnetization of magnets on the work of the line start permanent magnet synchronous motor (LSPMSM). The elaborated software was used to study the effect of temperature during the motor starting phase on the magnetization state of the magnets after the start-up process. The calculation results were compared to the results of experimental studies. The experimental tests were carried out on a specially constructed test stand. The results of the research on the process of partial demagnetization of the magnets are presented and the conclusions resulting therefrom formulated.
Highlights
Line start permanent magnet synchronous motors (LSPMSM) are increasingly used in electric drives without a speed control instead of squirrel cage induction motors
The authors, due to the lack of commercial software enabling the analysis of the simultaneous effect of stator current and temperature during motor dynamics on the process of partial demagnetization of permanent magnets, have attempted to develop a field model of coupled electromagnetic-thermal phenomena in an LSPMSM
Temperature the processthat of the partial demagnetization of magnets onfor the ofofLSPMSM. It should and be emphasized advantage of the presented algorithm thecourse analysis coupled dynamic states. Such a possibility is not available in commercially available software packages for electromagnetic and thermal phenomena is that it takes into account the influence of temperature analysis of coupled phenomena in machines of excited by permanent magnets
Summary
Line start permanent magnet synchronous motors (LSPMSM) are increasingly used in electric drives without a speed control instead of squirrel cage induction motors. The comprehensive models allow the analysis of the dynamic state of the machine, taking into account both the process of partial demagnetization of magnets and the effect of temperature on the magnetic, electrical and thermal properties of materials. The authors, due to the lack of commercial software enabling the analysis of the simultaneous effect of stator current and temperature during motor dynamics on the process of partial demagnetization of permanent magnets, have attempted to develop a field model of coupled electromagnetic-thermal phenomena in an LSPMSM. The software was used to analyze the simultaneous impact of armature current and temperature during motor dynamics on the process of partial demagnetization of permanent magnets.
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