紋波電壓的幾個政策方法。
1． 最大紋波電壓。
在額外輸出電壓和負載電流下，輸出電壓的紋波（包括噪聲）的必定值的大小，通常以峰峰值或有用值標明。
2． 紋波系數Y（%）。
在額外負載電流下，輸出紋波電壓的有用值Urms與輸出直流電壓Uo之比，既
y=Umrs/Uo x100%
3． 紋波電壓克制比。
在規(guī)矩的紋波頻率（例如50HZ）下，輸出電壓中的紋波電壓Ui~與輸出電壓中的紋波電壓Uo~之比，即：
紋波電壓克制比=Ui~/Uo~ 。
選用變頻器工作時，電機的起動電流、起動轉矩怎么？
選用變頻器工作，隨著電機的加快相應跋涉頻率和電壓，起動電流被束縛在150%額外電流以下(根據機種不一樣，為125%~200%)。用工頻電源直接起動時，起動電流為6~7倍，因而，將發(fā)作機械電氣上的沖擊。選用變頻器傳動可以滑潤地起動(起動時間變長)。起動電流為額外電流的1.2~1.5倍，起動轉矩為70%~120%額外轉矩；對於帶有轉矩主動增強功用的變頻器，起動轉矩為100%以上，可以帶全負載起動。
過熱維護。在電源內部發(fā)作失�；蛞蜻\用不當而使電源溫升超支時間斷電源的工作并宣布報警信號。九． 溫度漂移和溫度系數。

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