Research On PMSM Vector Control System Using Kalman Filter

Servo systems are ever-increasingly utilized in many fields, including industrial controllers and household appliances. Meanwhile, higher control performance of servo products with lower cost is also a subject of great interest world widely. Digital controlled AC servo systems, using Permanent Magnet Synchronous Motors (PMSM) as power converters, controlled by Digital Signal Processor (DSP) with advanced control strategies, will be a trend.With the theory and characteristics of PMSM vector control analyzed, and the FOCstrategy employing i_d =0 chosen, the control scheme of PMSM servo system by SVPWMis established with two-close-loop regulators, the simulation model is built in Matlab/Simulink. After analyzing the mathematical model of PMSM, this paper presents a kalman filter with position feedback to improve a higher low-speed performance of the PMSM vector control system. Then the thesis emphasizes the illustration of the principle of the EKF and its application in the system, and the simulation model of the vector control system of PMSM based on the EKF is established and the application of the sensorless in motor control is successfully realized. The reasonability and validity of the EKF programmer in the motor control have been testified by the simulation results.The PMSM vector control system's experiment platform is based on the hardware of Freescale DSP56F8357,and the software design is accomplished in Codewarrior integrated development environment. The result from PC master verify the validity and practicality of the investigation.