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三相电机VF控制模块svgen_mf.c的一点疑问?

svgen_mf.h 中定义了一个变量        _iq  FreqMax;     // Parameter: Maximum step angle = 6*base_freq*T (pu)

这里面的base_freq是多少呀,50hz还是我自己设的频率呀?这个公式是怎么来的呀。这个参数代表啥意思呢?