关键词: 异步电动机, 模型参考自适应系统, 转子电阻辨识, 全阶观测器, 反步控制

Abstract: To solve the problem that the change of rotor resistance of asynchronous motor affects the accuracy of vector control,the poles assignment method was introduced to design the full order state observer of asynchronous motor to estimate the rotor flux in real time. The model reference adaptive system was built by taking the asynchronous motor itself as the reference model and the full order observer as the adjustable model.The on-line identification algorithm of rotor resistance was designed by Popov's hyperstability theory to avoid the influence of rotor resistance on vector control system.The backstepping method was used to design the controller instead of the traditional PI controller to obtain faster dynamic response and better steady-state performance.Simulation results showed that the on-line identification algorithm of rotor resistance can quickly estimate the rotor resistance, and the designed backstepping controller can improve the control accuracy.

Key words: asynchronous motor, model reference adaptive system (MRAS), rotor resistance identification, full order observer, backstepping control