FPGA-based implementation of DTSFC and DTRFC algorithms

In this paper, authors present a FPGA-based implementation of direct torque and stator flux control (DTSFC) and direct torque and rotor flux control (DTRFC) with and without use of space vector modulation (SVM) for induction motor drives. Indeed, due to their similar structures but also their differences, this set of algorithms is a good example to show the effectiveness of a FPGA-based modular approach to implement sensorless control induction motor drives. Therefore, the chosen solution is based on a custom hardware architecture designed by assembling a set of building blocks. These blocks are tested and organized in a library of intellectual property (IP) modules for easy re-use. Each block is geared toward specific algorithm function (flux estimator, hysteresis controller...). Besides, a special attention is given to the algorithm refinement which allows finding the optimum fixed-point data word length. Finally experimental results are shown which validate the proposed approach.