two-step excitation

two-step action,两位作用
two-step control,两位控制
two-step controller,两位控制器

step-by-step excitation 逐步激发

step-up excitation 升压激励

two-step excitation 两步激发?两位励磁?

two-step [简明英汉词典]
n.拍圆舞, 拍圆舞曲
excitation [简明英汉词典]
[7eksi5teiFEn]
n.刺激, 兴奋, 激动, 激励, 鼓舞, [物]激发, 励磁, [植]激感(现象)
two-step excitation应该是令人激动的两节拍圆舞曲。

双频激发