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介绍了 Ｍ Ｄ９０ 飞机机载变速恒频交流电源系统的组成和工作原理。重点对其输出阶梯波的谐波作了理论分析和数值计算，对计算结果进行了分析和比较。
The composition and working principle of M D90 airborne constant speed AC power system are introduced. The emphasis is put on the theoretical analysis and numerical calculation of the harmonics of the output staircase wave. The calculation results are analyzed and compared.