带转子电阻估计的感应电机无速度传感器控制

The Speed Sensorless Control for Induction Motor with Rotor Resistance Estimation

对于转子电阻未知的感应电机提出了一种可以估计转子电阻的转速估计方法.该方法假设定子电阻已知,用改进的电压模型估计转子磁链.然后根据感应电机的静止坐标系模型推出转速和转子电阻的表达式,在已知转子磁链的情况下,将这两个表达式看作一个二元一次方程组,解出转速和转子电阻的解析表达式,分析了这两个量的表达式的成立条件.提出了感应电机的无速度传感器控制方案.仿真研究表明,本文提出的方法能准确地估计感应电机的转速和转子电阻.

A speed estimation method,which can estimate the rotor resistance,was proposed for induction motor,whose rotor resistance is unknown.In this scheme,the stator resistance was supposed to be known,therefore the improved voltage model was used to estimate the rotor flux.From the stationary frame model of induction motor,two expressions of rotor speed and rotor resistance were deduced.Under the condition that the rotor flux is known,the two expressions are taken as two binary simple equations.Solving the two equations,we can get the expressions of the unknown rotor speed and rotor resistance.The validation requirements of the two expressions were analyzed.The speed sensorless control scheme was proposed for induction motors.The simulation results indicate that the proposed scheme can estimate the rotor speed and the rotor resistance accurately.