頻敏變阻器是一種由鑄鐵片或鋼板疊成鐵心,外麵再套上繞組的三相電抗器,接在轉子繞組的電路中,其繞組電抗和鐵心損耗的決定的等效阻抗隨著轉子電流的頻率而變化.頻敏變阻器實際上利用轉子頻率f2的平滑變化達到使轉子回路總電阻平滑減小的目的。頻敏變阻器實際上是一個特殊的三相鐵芯diankangqi
，tayouyigesanzhutiexin，meigezhushangyouyigeraozu，sanxiangraozuyibanjiechengxingxing。pinminbianzuqidezheyipinlvtexingfeichangshiheyukongzhiyibudiandongjideqidongguocheng。pinminbianzuqishiyizhongwuchudiandianciyuanjian，xiangdangyuyigedengzhizukang。