This paper presents a new design of the torque and stator flux estimators for Direct

Torque control (DTC) for Field Programmable Gate Array (FPGA) implementation, which permit

very fast calculations. An alternative variable word-size approach in two’s complement fixedpoint

format is used for the implementation, in order to minimize calculation errors and the

hardware resource usage. The simulation results of DTC model in Matlab, which performed

double-precision calculations, are used as references to digital computations executed in FPGA

implementation. The Hardware-in-the-loop (HIL) method is used to verify the minimal error

between Matlab simulation and the experimental results, and thus the well-functionality of the

implemented estimators.