Wound-rotor induction motors that adjust speed by connecting resistors in series to rotor circuits,have found a wide range of applications in the electrically controlled systems of mine-well hoists.

• 采用转子回路串电阻调速的绕线式异步电机广泛应用于矿井提升机电控系统,提出了将斩波串级调速方案应用于改造该类矿井提升机电控系统。