FPGA Implementation of an Arbitrary Injection based Sensorless Control for PMSM

This work proposed an FPGA implementation for sensorless control of PMSM. The arbitrary injection method that utilizes a transient current slop to estimate rotor position is adopted and further improved to adapt its digital realization. On account of fast current sampling and fast parallel computation capability, a single FPGA is chosen as the PMSM controller involving both filed oriented control and sensorless control. The over-sampling technique is employed to increase the accuracy of current measurement. As a result, the rotor position and speed estimation is enhanced. The experiments are carried out on an FPGA based testbench including a 3kW PMSM.