As the working characteristic of squirrel-cage induction motor is hard to suit the needs of start-up and speeding-up of vehicles, the speed con-trol of electric motor becomes a critical point for the design of electric LHD unit.

• 由于鼠笼式电动机的工作特性难于适应车辆起动、加速等多变工况的要求,因此,电动机的调速乃是电动铲运机设计中的关键问题。