1提升机的机械特性提升机属位能负载。交流提升机多用异步电动机串电阻调速启动,通过时间继电器的延时,逐步切除转子电转,其启动特性如图1。按提升机启动特性及原理,提升机电控系统图,从我国上世纪50年代引进原苏联图纸经转化后的30多年始终未改变过,提升机的启动延时回路见图2 1 hoist mechanical properties Hoisting machine position can load. AC hoist multi-purpose induction motor speed resistor series start, by the time relay delay, and gradually cut off the rotor electromechanical, the starting characteristics shown in Figure 1. According to the characteristics and principle of the hoisting machine start-up, hoist electromechanical control system diagram, from the introduction of the Soviet Union drawings in the 1950s of last century, the drawings of the former Soviet Union have not changed after more than 30 years of transformation.