纹波电压的几个政策方法。
1． 最大纹波电压。
在额外输出电压和负载电流下，输出电压的纹波（包括噪声）的必定值的大小，通常以峰峰值或有用值标明。
2． 纹波系数Y（%）。
在额外负载电流下，输出纹波电压的有用值Urms与输出直流电压Uo之比，既
y=Umrs/Uo x100%
3． 纹波电压克制比。
在规矩的纹波频率（例如50HZ）下，输出电压中的纹波电压Ui~与输出电压中的纹波电压Uo~之比，即：
纹波电压克制比=Ui~/Uo~ 。
选用变频器工作时，电机的起动电流、起动转矩怎么？
选用变频器工作，随著电机的加快相应跋涉频率和电压，起动电流被束缚在150%额外电流以下(根据机种不一样，为125%~200%)。用工频电源直接起动时，起动电流为6~7倍，因而，将发作机械电气上的冲击。选用变频器传动可以滑润地起动(起动时间变长)。起动电流为额外电流的1.2~1.5倍，起动转矩为70%~120%额外转矩；对於带有转矩主动增强功用的变频器，起动转矩为100%以上，可以带全负载起动。
过热维护。在电源内部发作失常或因运用不当而使电源温升超支时间断电源的工作并宣布报警信号。九． 温度漂移和温度系数。

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