軟ruan啟qi動dong器qi采cai用yong三san相xiang反fan並bing聯lian晶jing閘zha管guan作zuo為wei調tiao壓ya器qi,用yong這zhe種zhong電dian路lu如ru三san相xiang全quan控kong橋qiao式shi整zheng流liu電dian路lu,使shi用yong軟ruan啟qi動dong器qi啟qi動dong電dian動dong機ji時shi,晶jing閘zha管guan的de輸shu出chu電dian壓ya逐zhu漸jian增zeng加jia,電dian動dong機ji逐zhu漸jian加jia速su,直zhi到dao晶jing閘zha管guan全quan導dao通tong,電dian動dong機ji工gong作zuo在zai額e定ding電dian壓ya的de機ji械xie特te性xing上shang,實shi現xian平ping滑hua啟qi動dong,降jiang低di啟qi動dong電dian流liu,避免啟動過流跳閘。將其接入電源和電動機定子之間。