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采用矢量控制的变频调速技术和ＰＬＣ改造老式电梯的电气控制系统，提高了电梯运行的可靠性和舒适感，实现了节能降耗，具有现实意义和推广价值。探讨了系统结构设计、变频器容量及制动电阻选择和速度控制曲线等问题。
The use of vector control of frequency control technology and PLC transformation of the old elevator electrical control system to improve the reliability and comfort of the elevator operation and achieve energy saving, with practical significance and promotion of value. Discusses the system structure design, inverter capacity and brake resistor selection and speed control curve and other issues.