The generators supply a three-phase voltage. The frequency of this voltage increases when the generator rotor speed increases.
A发动机提供三相电压，当发动机转子速度升高时，此电压的频率会增加。
B发动机提供三相电压，当发动机转子速度升高时，此频率的电压会增加。
C发动机提供三相电压，当发动机转子速度升高时，此电压的变化速度会增加。
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