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Detailed Design of a High Speed Switched Reluctance Starter/Generator for More/All Electric Aircraft 总被引:1,自引:0,他引:1
The basic concepts and advantages of more/all electric aircraft (M/AEA) are briefly addressed. The combined starter/generator (CS/G) system is introduced as a key technology to enable M/AEA. Some important performance requirements for CS/G system are obtained. Based on these requirements, a high speed switched reluctance machine (SRM) is designed to operate as a starter/generator. The entire design process is mainly divided into two stages: electromagnetic design and thermal design. In electromagnetic design stage, the electromagnetic structure and dimensions of the machine and the number of phase winding turns per pole are obtained; the topology and main technical details of the converter are briefly introduced as well. In thermal design stage, a liquid-cooling system is designed based on the thermal analysis of the machine. In the end, the performances of the designed SRM are basically verified by simulation. To get high performances, the exciting angles are optimized in two different operating modes respectively, and the optimized performances in the motoring mode are given as well. 相似文献
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基于气动起动机零件的可靠度威布尔分布特点来制定维修策略,为提高使用可靠性、消除和控制不可接受安全状况以及降低维修成本提出维护措施和建议。本文可为起动机修理和航线的起动机维护提供一定参考和思路。 相似文献
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基于频谱法的航空起动发电机故障检测与诊断 总被引:5,自引:0,他引:5
对航空直流起动发电机的电枢电流波形进行频谱分析可有效地对电机的故障进行检测和诊断.由于电机在运行时其转速是变化的,而电枢电流的纹波信号与电机转速成正比,若对电流进行定时采样,则其频谱会散布在很宽的频率范围内,使频谱特征模糊化,难于利用频谱特征进行故障检测和诊断.采用与转速同步的电流采样方法,得到的频谱称为"阶比谱",在阶比谱上,频谱成分是单一的,因此容易用它来进行故障检测和诊断.文中对起动发电机进行了实验,对线圈短路、绕组元件与换向片开焊、相邻导体短路和转子偏心等四种故障成功地进行了检测和诊断. 相似文献
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针对一起由接触器熔焊导致赛斯纳172R飞机整机断电的故障现象,对该机型接触器的工作原理展开了研究,深入分析了接触器发生熔焊的机理和引起触头熔焊失效的原因,从操作者和维护者的角度提出预防触头熔焊的防范建议和排除类似故障的具体方案。 相似文献
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介绍了某型燃气涡轮起动机在高空台进行高空起动试验的安装方式、试验条件和试验方法,并对高空起动试验结果进行了详细分析。研究表明,通过增加起动加速供油量与起动电机功率,可有效扩展燃气涡轮起动机的高空起动包线,且起动机的冷机时间对其起动特性有着显著影响。同时,在此类起动机高空台试验中,应对滑油管道提供相应的保温措施,以保证起动机在低温环境下的冷机过程中,滑油温度不至于过低而影响起动。 相似文献
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对航空无刷同步电机起动发电系统电动运行的励磁特性进行了理论分析,提出了交直流混合励磁方案,建立了系统的MATLAB/SIMULINK仿真模型。仿真结果表明,主发电机励磁电流平均值随励磁机励磁频率的升高而减小,且主发电机励磁电流脉动率随转速升高有唯一极小值点,该点可作为交直流励磁的切换点。 相似文献