FPGA Based Hybrid Sensorless Controller Design for PMSM Drive System

In order to improve the dynamic control performance of sensorless PMSM drive system, higher sampling frequency and faster calculation capability are required. As a result, in this work an FPGA based PMSM controller is investigated and a hybrid sensorless control is implemented combining square-wave pulsating signal injection at low speed range and arbitrary injection at high speed range. The current over-sampling technique enabled by flexible FPGA configuration is employed to increase the accuracy of current measurement. The experiments are carried out on an FPGA based testbench including a 3kW PMSM.