R88D-UA02H
R88D-UA02H
R88D-UA02H
7、V/f模式是什么意思?
频率下降时电压V也成比例下降，这个问题已在回答4说明。V与f的比例关系是考虑了电机特性而预先决定的，通常在控制器的存储装置(ROM)中存有几种特性，可以用开关或标度盘进行选择。
8、按比例地改V和f时，电机的转矩如何变化?
频率下降时完全成比例地降低电压，电机将造成在低速下产生地转矩有减小的倾向。因此，在低频时给定V/f,要使输出电压提高一些,以便获得一定地起动转矩,这种补偿称增强起动。可以采用各种方法实现,有自动进行的方法、选择V/f模式或调整电位器等方法。
9、在说明书上写著变速范围50~5Hz，即10:1，那么在6Hz以下就没有输出功率吗?
在6Hz以下仍可输出功率，但根据电机温升和起动转矩的大小等条件，低使用频率取6Hz左右，此时电动机可输出额定转矩而不会引起严重的发热问题。变频器实际输出频率(起动频率)根据机种为0.5~3Hz.
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