可估计转子电阻的感应电机无速度传感器控制

Speed-sensorless Control of Induction Motor with Rotor Resistance Estimation

为了解决感应电机转子电阻未知情况下的无速度传感器控制问题,用电压模型估计转子磁链,将磁链给定注入交流信号估计转子电阻,分析了注入交流信号的原因,由感应电机静止坐标系模型推出转速估计表达式,再将估计的转子电阻代入其中估计转速。经仿真,转子电阻、转子磁链和转速的估计精度较高,且转子电阻估计值可以跟踪其实际值的变化。

To solve the problem of speed-sensorless control for induction motor with unknown rotor resistance, the voltage model was adopted to estimate the rotor flux; then injected AC （altering current） signal to rotor flux reference signal to estimate the rotor resistance. The reason for using the injection signal was ana- lyzed using the static frame model of induction motor. The rotor speed expression was derived, and substituted the estimated rotor resistance into the expression to estimate the rotor speed. The simulation results indicate that the estimation of the rotor resistance, rotor flux and the rotor speed is accurate and the estimated rotor resistance can trace the changing rotor resistance.