Position Sensorless Control Of Permanent Magnet Synchronous Motor Drive System

Permanent magnet synchronous motor is widely used in electric vehicles drive system because of its advantages such as high power density,high efficiency,low torque ripple,small volume and light weight.But the installation of position sensor,on the one hand,may increase the system cost and the rotational inertia of the shaft,on the other hand,the signal may be interrupted or lost at the complex or harsh working condition,which influence the safety and reliability of the system operation directly.At first,this paper analyzes sensorless controlled SMPMSM drive system based on differential algebraic,tracking differentiator is adopted to acquire the first order numerical differentiation to eliminate the interference of noise,and the system modeling and simulation verify that sensorless control based on differential algebraic can realize the rotor position estimation of SMPMSM drive system in a wide speed range.Next,the paper mainly studies the influence of inverter nonlinear on the rotor position estimation precision based on differential algebraic.First the inverter deadtime compensation based on model-free adaptive observer is used to improve the precision of rotor position estimation,but considering the influence of the inverter parasitic capacitance,and then proposing the inverter deadtime compensation method considering inverter switching devices' parasitic capacitance,the technical route combining system modeling,simulation and experiment test is implemented to confirm that the proposed inverter deadtime compensation method can improve the rotor position estimation precision of SMPMSM drives system based on differential algebraic.At last,considering the motor parameters may change with the operating condition,the paper establishes SMPMSM mathematical model considering motor parameter uncertainty,then design the model-free observer to realize the disturbance voltage estimation caused by the inverter deadtime effect and motor parameters variation,and then compensate to the inverter's reference voltage,aim at promoting the operation performance of the sensorless controlled SMPMSM drive system based on differential algebraic.