Implementation of PWM-based Direct Instantaneous Torque Control with Duty Cycle Interlock for a Switched Reluctance Machine

To obtain a constant output torque of switched reluctance machines (SRMs), direct instantaneous torque control (DITC) is a common method. There are several ways to modify and realize this algorithm. In this paper, we show the pulse width modulation (PWM) based DITC algorithm which is extended by a duty cycle interlock (DCI) that makes a compromise of minimizing both the resulting torque ripple and the switching losses of the inverter. Furthermore, the DCI guarantees phase overlap and consequently smooth torque at low speed.The control algorithm is realized on a programmable logic device (FPGA). The paper presents the chosen controller board’s hardware topology as well as the key code segments that are graphically implemented in very high speed integrated circuit hardware description language (VHDL). The effects and advantages of the introduced DCI are investigated in simulation.