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使用V/F控制程序驱动时，比如说设定输出频率20HZ,输出电压22V，当不连接电机时测量输出电压就是22V，当连接电机时电压降到了12V，埃斯顿电机仅有400W，额定频率200赫兹，所以会不会套件有问题
