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變頻器的載波頻率越高，輸出電流波形越接近正弦波，這會降低電機的運行溫度，從而延長絕緣的壽命。但是，更高的載波頻率意味著每秒鐘產生的尖峰電壓數量更多，對電機的沖擊的次數更多。圖4給出了絕緣壽命隨著電纜長度與載波頻率的變化。從圖中可知，對于200英尺長的電纜，當載波頻率從3kHz提高到12kHz(變化4倍)時，絕緣的壽命從大約8萬小時降低到2萬小時(相差4倍)。
廈門岳航計算機工程有限公司
聯系人：李素云
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載波頻率對絕緣的影響
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