曳引 meaning in Chinese

drag
haulage
tow

Kone is the inventor and pioneer of permanent magnet synchronous traction technology
通力是永磁同步无轮曳引技术的发明者和领跑者。
The elevator has vvvf inverter that can accurately control traction and drive systems ( door drive system )
精确的控制曳引驱动系统（门驱动系统）的vvvf逆变器。
The key items include the car sinking , constant speed characteristics , inspection function , auto relevelling function and level accuracy , etc . the research contents focus on the following three parts : firstly , research on effects of system parameters on car sinking has been completed . secondly , the constant speed performance with the compensation of internal leakage of pump / motor is improved . lastly , research on improvement of the car level accuracy and contrast to that of traction elevators is presented , and the reasons of low car level accuracy of hydraulic elevators are discussed
重点研究了三方面内容：一是研究了停层沉降特性及影响电梯轿厢停层沉降特性的各种因素；其次是通过负载压力补偿液压泵马达内泄漏来改善电梯轿厢速度稳定性；最后是液压电梯平层精度的理论和实验研究，并与曳引电梯的理论模型进行了对比，阐述了液压电梯平层精度低的原因，理论探讨了影响液压电梯平层精度的主要因素。