Control Strategy Of Permanent Magnet Synchronous Motor Based On T-S Fuzzy Model

Permanent magnet synchronous motor(PMSM)is widely used in industry and daily life because of its light weight,small size,low loss and high efficiency.Permanent magnet synchronous motor(PMSM)is a complex system with strong coupling and nonlinearity.In the driving process of the system,there are many problems,such as load disturbance and parameter uncertainty.In order to solve the above problems,the following aspects are studied.The current and back EMF in the static coordinate system are selected as the state variables to establish the nonlinear mathematical model of PMSM.According to its nonlinear mathematical model,the T-S fuzzy model is established by sector nonlinear method.Three nonlinear terms in the model are selected as antecedent variables,and the nonlinear mathematical model of PMSM is divided into eight linear subspaces.The uncertainty of resistance and inductance of permanent magnet synchronous motor(PMSM)is analyzed quantitatively,and a T-S fuzzy model with uncertainty is established.Aiming at the T-S fuzzy model of permanent magnet synchronous motor,a fuzzy controller based on parallel distributed compensation structure is designed.According to the principle of parallel distributed compensation,a fuzzy controller is designed for each subsystem,and the control gain of the subsystem is obtained by linear matrix inequality.The antecedent part and T-S fuzzy model of the controller select the same antecedent variables and fuzzy sets,while the latter part is a local linear controller.The global fuzzy controller of PMSM is obtained by combining each local controller with fuzzy membership function.The feasibility of the fuzzy controller is verified by simulation.Aiming at the T-S fuzzy model of permanent magnet synchronous motor with parameter uncertainty and load disturbance,the robust H∞ control strategy is studied.Firstly,the system parameter uncertainty matrix is decomposed.Through the stability analysis of the H∞ controller,the linear matrix inequality for solving the robust H∞ controller is derived.The global robust H∞ controller of permanent magnet synchronous motor is obtained by the parallel distributed compensation principle.The simulation results show that this method has obvious advantages in dealing with system parameter uncertainty and restraining load disturbance...