當dang今jin傳chuan動dong工gong程cheng中zhong最zui常chang用yong的de就jiu是shi三san相xiang交jiao流liu感gan應ying電dian動dong機ji。在zai許xu多duo場chang合he中zhong
，由you於yu其qi啟qi動dong特te性xing，這zhe些xie電dian動dong機ji湧yong直zhi接jie連lian接jie電dian源yuan係xi統tong。如ru果guo直zhi接jie在zai線xian啟qi動dong
，將jiang會hui產chan生sheng高gao達da電dian機ji額e定ding電dian流liu6beidelangyongdianliu。gaidianliuhuishigongdianxitonghechuanliandekaiguanshebeiguozai。ruguozhijieqidong，yehuichanshengjiaogaodefengzhizhuanju，zhezhongchongjibudanhuiduiqudongdiandongjichanshengchongji，erqieyehuishiyongjixiezhuangzhishousun。
HPMV中、高gao壓ya軟ruan啟qi動dong器qi是shi用yong多duo個ge可ke控kong矽gui串chuan並bing聯lian而er成cheng，可ke以yi滿man足zu不bu同tong的de電dian流liu及ji電dian壓ya要yao求qiu，控kong製zhi可ke控kong矽gui的de觸chu發fa角jiao就jiu可ke以yi控kong製zhi輸shu出chu電dian壓ya的de大da小xiao。當dang電dian機ji啟qi動dong過guo程cheng中zhong，HPMV按照預先設定的啟動曲線增加電機的端電壓使電機平滑加速，從而減少了電機啟動時對電網
、電機本身
、相連設備的電氣及機械衝擊。當電機達到正常轉速後，旁路接觸器接通。電機啟動完畢後，HPMV軟ruan啟qi動dong器qi繼ji續xu監jian控kong電dian機ji並bing提ti供gong各ge種zhong故gu障zhang保bao護hu。在zai軟ruan停ting機ji時shi首shou先xian按an照zhao預yu先xian設she定ding好hao的de停ting機ji曲qu線xian平ping滑hua地di降jiang低di電dian機ji的de端duan電dian壓ya直zhi到dao電dian機ji停ting機ji。軟ruan停ting可ke以yi解jie決jue突tu然ran停ting機ji引yin啟qi的de水shui泵beng水shui錘chui現xian象xiang及ji機ji械xie衝chong擊ji等deng相xiang關guan問wen題ti。