Phase sequence(相序) a→b→c- positive phase sequence c→b→a- negative phase sequence ch n Van+v br bn anty bn (+ phase sequence C phase sequence anty butyn =0 anty btv cn =0Phase sequence(相序) (-) phase sequence (+) phase sequence + + = 0 • • • V an V bn V cn V bn • V cn • V an • V an V bn • • + V an • V bn • V cn • V an V bn • • + a  b  c -- positive phase sequence c  b  a -- negative phase sequence + + = 0 • • • V an V bn V cn