环境温度对电励磁双凸极发电机输出特性的影响

电励磁双凸极发电机DSEG(doubly salient electro-magnetic generator)是一种高温运行能力强的新型无刷直流发电机,但对其温度特性尚缺乏研究。为给DSEG设计和应用提供理论依据,对环境温度改变时的DSEG发电性能进行研究。采用等效磁路法和有限元法,并结合不同温度下的铁心材料磁导率曲线,分析了温度对电机磁场和绕组电感的影响;研究了不同温度下电机的负载特性;将不同温度下的铁心材料和绕组铜材进行组合,通过有限元建模对比分析,研究了温升导致的电枢绕组电阻变化和铁心磁阻的变化单一变量对电机外特性的影响。最后在电机动态温升实验及静止热实验的基础上,进行温度特性实验,将电机冷态和热态实验结果和仿真结果进行对比分析,验证了理论研究和仿真的正确性。所得结论对DSEG的电磁设计和工程应用具有指导性意义。

Effects of Ambient Temperature on Output Characteristics of Doubly Salient Electro-magnetic Generator

Doubly salient electro-magnetic generator (DSEG) is a novel type of brushless DC generator with strong hi-gh-temperature operation capability. However, there is few research on its temperature characteristics. To provide a reliable theoretical basis for the design and application of DSEG, the power generation characteristics of DSEG at different ambient temperatures are studied in this paper. Using the equivalent magnetic circuit method and finite element method (FEM), the effects of temperature on the magnetic field and winding inductance of DSEG are analyzed with the combination of magnetic permeability curves of core material at different temperatures. Then, the load characteristics of DSEG at different temperatures are studied. By combining the core material and copper winding material at different temperatures, the effects of the change in winding resistance and that in core magnetic resistance due to temperature rise on the DSEG''s external performance are studied, respectively. Finally, based on the dynamic temperature rise test and the static thermal test of DSEG, the temperature characteristic experiments were carried out. Through the comparative analysis of cold- and hot-state experimental results and simulation results, the theoretical analysis and simulations were verified. The conclusions in this paper are of guiding significance to the electro-magnetic design and engineering applications of DSEG.