当电枢敲击下方的金属条时，就会听到刺耳的卡嗒声。
As the armature strikes the bar beneath it, a sharp click is heard.
所比较的变量有电枢相电压和相电流、励磁电流、负载电流以及阻尼条电流。
The variables compared include the phase voltage and the phase current of the armature winding, the field current, the load current and the damper bar currents.
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