Fully digital FPGA-based current controller for switched reluctance machines

A novel fully digital FPGA-based current controller for switched reluctance machines is presented in this paper. The digital current controller provides PWM and hysteresis band modulation in a seamless way and allows complex rotor position based shaping of the phase currents to optimize torque ripple and acoustic behavior. Arbitrary phase current waveforms can be stored in a position-addressed memory. The FPGA based implementation ensures flexible scaling and adaptation to various machine designs and inverter topologies. Experimental results prove the feasibility and performance of the chosen approach.