电梯曳引机Traction machine

中文译文
电梯曳引机Traction machine(中文3500字,英文2000字)
曳引机是电梯的动力源（又称主机），通常由电动机、制动器、减速机和底座组成；是靠曳引钢丝绳与曳引轮的摩擦来实现轿厢运行的驱动机。曳引机又以电动机与曳引轮之间有无减速机区分为有齿轮曳引机和无齿轮曳引机两种。
2-1有齿轮曳引机
有齿轮曳引机广泛用于运行速度v ≤2.0m/s的各种货梯、客梯、杂物梯。为了减小曳引机运行时的噪音和提高平稳性，一般采用蜗轮副作减速传动装置。
这种曳引机主要由曳引电动机、蜗轮、蜗杆、制动器、曳引绳轮、机座等构成，其外形如图2-1。
电梯的载荷、运行速度等主要参数取决于曳引机的电机功率和转速，蜗轮与蜗杆的模数和减速比，曳引轮的直径和绳槽数，以及曳引比（曳引方式）等。

英文翻译
Traction machine
As power provider for lift, traction machine, also called main machine, is composed of motor, brake, geared machine and seat.  It is a drive to make car move by means of the friction between traction rope and sheave.  According to whether the geared machine is provided or not, it is classified into geared and gearless types.
Geared traction machine
Geared traction machine
is widely used in cargo lift, passenger lift and service lift with speed of not more than 2.0m/s.  To reduce working noise and enhance stability, worm gear is normally used as geared drive.  Such machine is composed of motor, worm, gear, brake, rope and seat, as shown is figure 2-1.
Main parameters, such as lift load and speed are determined by Hp and speed of traction machine, worm and gear numbers, gear ratio, diameter of traction machine, rope grooves and traction ratio (traction mode).