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變頻器有哪些部件需要定期更換?

發布時間:2021-08-27   點擊次數:130次
   變頻器是可調速驅動系統的一種,是應用變頻驅動技術改變交流電動機工作電壓的頻率和幅度,來平滑控制交流電動機速度及轉矩,常見的是輸入及輸出都是交流電的交流/交流轉換器。它的應用范圍很廣,從小型家電到大型的礦場研磨機及壓縮機。但是,如果通用變頻器使用不當,操作有誤,維護不及時,仍會發生故障或運行狀況改變縮短設備的使用壽命。因此,日常的維護與檢修工作顯得尤為重要。
  變頻器是通過應用電力電子技術,改變電機工作電源頻率,以控制電機不同轉速的電力控制設備。廣泛應用于各工業領域,尤其在電梯、紡織、機床、起重運輸和港口等行業。
  變頻器主要有整流電路、緩沖電路、濾波電路、逆變電路,以及許多電子零件等組成。由于變頻器組成或物理特性的原因,在一定的時期內會產生劣化,因而會降低變頻器的特性,甚至會引起故障。由此,為了預防維護,有必要實行定期更換。
  那么,變頻器有哪些部件是需要定期更換的?
  1.熔斷器的額定電流大與負載電流,在正常使用條件下,壽命約為10年,需要在此時間內維護甚至更換。
  2.繼電器和接觸器達到一定累積開關次數后,后發生接觸不良,需要檢查和更換。
  3.冷卻風扇: 變頻器主回路半導體器件冷卻風扇加速散熱,保證在允許溫蒂以下正常運行。而冷卻風扇的壽命受限于軸承,大約為10000~35000h。當變頻器連續運行時,需要在幾年之后更換一次風扇或軸承。
  4.定時器在使用數年之后,動作時間會有很大變化,所以在檢查動作時間之后進行更換。
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