Analyzing the methods to design analog and digital VVVF base on SPWM chip, and ensuring the maximal torque of the motors be invariable, this paper proposes a new control algorithm using parameters from the data plate of three-phase induction motors.

• 以SPWM专用集成电路为基础,对模拟式与数字式两种方案的三相异步电动机变频调速控制器的设计方法分别进行讨论,研究具有最大转矩不变和依据电机铭牌参数进行电压、率协调算法自整定功能的新型控制方案。