塔ta式shi起qi重zhong機ji的de動dong臂bi形xing式shi分fen水shui平ping式shi和he壓ya杆gan式shi兩liang種zhong。動dong臂bi為wei水shui平ping式shi時shi，載zai重zhong小xiao車che沿yan水shui平ping動dong臂bi運yun行xing變bian幅fu，變bian幅fu運yun動dong平ping衡heng，其qi動dong臂bi較jiao長chang，但dan動dong臂bi自zi重zhong較jiao大da。動dong臂bi為wei壓ya杆gan式shi時shi，變bian幅fu機ji構gou曳ye引yin動dong臂bi仰yang俯fu變bian幅fu，變bian幅fu運yun動dong不bu如ru水shui平ping式shi平ping穩wen，但dan其qi自zi重zhong較jiao小xiao。

塔ta式shi起qi重zhong機ji的de起qi重zhong量liang隨sui幅fu度du而er變bian化hua。起qi重zhong量liang與yu幅fu度du的de乘cheng積ji稱cheng為wei載zai荷he力li矩ju
，是shi這zhe種zhong起qi重zhong機ji的de主zhu要yao技ji術shu參can數shu。通tong過guo回hui轉zhuan機ji構gou和he回hui轉zhuan支zhi承cheng
，塔ta式shi起qi重zhong機ji的de起qi升sheng高gao度du大da，回hui轉zhuan和he行xing走zou的de慣guan性xing質zhi量liang大da，故gu需xu要yao有you良liang好hao的de調tiao速su性xing能neng，特te別bie起qi升sheng機ji構gou要yao求qiu能neng輕qing載zai快kuai速su、重載慢速
、安裝**位微動。一般除采用電阻調速外，還常采用渦流製動器
、調頻、變極
、可控矽和機電聯合等方式調速。