Robustness Analysis of Pole Placement Method with Single Degree of Freedom in Full Order Flux Observer

For the disadvantage of the low flux´s observational accuracy of induction motor direct torque control system when it runs in a low velocity, the full order flux observer is used to achieve the stator flux observation.Based on the analysis of four full order flux observer pole placement methods,The impact on observational accuracy and convergence rate was researched with different parameters of the Gain Matrix in the single degree of freedom pole placement method.The simulation results show that to ensure the stability of the system,the impacts on the flux observation were Effectively inhibited when Motor´s stator and rotor resistance parameters change through increasing parameter of the Gain Matrix,and the flux observer´s robustness was improved.