適用于：要求隨負(fù)載的性質(zhì)逐級(jí)調(diào)速的各種傳動(dòng)機(jī)械如機(jī)床、礦山、冶金、紡織、印染、化工等行業(yè)。
特點(diǎn)：采用改變繞組的接法來(lái)變換電機(jī)的轉(zhuǎn)速和輸出功率，使其與機(jī)械設(shè)備的負(fù)載特性相匹配,簡(jiǎn)化了變速系統(tǒng)，高效、節(jié)能。
變速方案：雙速、三速、四速

Applications: widely used in such industry which have step changes of rotational speed to meet the requirements of load character, as m-achine tools, mining, metallurgy, textile, printing and dyeing, chemical industry and agricultural machinery, etc.

Features: simplify speed-changing systems by changing the connection to obtain diferent output and speed.Pole-changing mode: double, three or four speed.