But because of some disadvantages such as their complex configuration, costliness, inconvenience of maintenance, they are gradually replaced by asynchronous machines.
英
美
- 传统的电梯采用直流电动机驱动,存在着结构复杂、制造成本高、可维护性差等系列不足,采用异步电机取代直流电机已是大势所趋。