適用于：要求隨負載的性質(zhì)逐級調(diào)速的各種傳動機械如機床、礦山、冶金、紡織、印染、化工等行業(yè)。Applications:widelyusedinsuchindustrywhichhavestepchangesofrotationalspeedtomeettherequirementsofloadcharacter,asmachinetools,mining,metallurgy,textile,printinganddyeing,chemicalindustryandagriculturalmachinery,etc.特點：采用改變繞組的接法來變換電機的轉(zhuǎn)速和輸出功率，使其與機械設(shè)備的負載特性相匹配，簡化了變速系統(tǒng)，高效、節(jié)能。Features:simplifyspeed-changingsystemsbychangingtheconnectiontoobtaindifferentoutputandspeed.變速方案：雙速、三速、四速Pole-changingmode:double,threeorfourspeed