Sensorless PI control of permenant magnet synchronous motor

The aim of this work is to present a sensorless PI control strategy for Permanent Magnet Synchronous Motor(PMSM). The control used in this study is based on Field Oriented Control (FOC) scheme and system feedbacks are providing from Sliding Mode Observer(SMO). After generating mathematical model of the Permanent Magnet Synchronous Motor, The PI controller parameters have been obtained according to determined bandwidth and damping ratio . Rotor position and speed information coming from mathematical model of the Permanent Magnet Synchronous Motor have been compared with the Sliding Mode Observer's speed and rotor position outputs. The continious time controller and observer model designed for the motor plant have been transferred to discrete time and automatically generated C code from system's discrete time model has been embedded to the microcontroller. By this way, the sliding mode observer structure and PI controller parameters which are obtained for PMSM's mathematical model was able to be implemented to physical system that contains a motor, driver and controller circuitry. The responses of physcial system and mathematical model have been compared.The similarities and differences of simulation and physical system results have been interpretted. Keywords: Permanent magnet synchronous motor, Sliding mode observer, PI controller, Field oriented control.