/ 도유지하철 전동차 저항 / 쵸퍼 / VVVF / PMSM 저항 / VVVF 쵸퍼 / VVVF 저항 / 쵸퍼 / VVVF 쵸퍼 VVVF VVVF 20px VVVF 20px VVVF 20px VVVF 20px VVVF