请教各位大神，使用矢量控制，当我用220v供电时，电机电流闭环，速度可以达到4500转；但是调低电压至175v后，转速一达到4000转，电机就像没力气了一样，一瞬间缓了下来。请问矢量控制速度上不去的原因？以及最大电压
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