Direct Instantaneous Thrust Control optimization of a linear switched reluctance actuator by Pulse-width modulation duty ratio adjustment

Direct Instantaneous Torque/Thrust Control (DITC) is a high performance technique, based on selecting the inverter´s “optimum voltage vector” thus allowing Force and Flux to quickly reach the reference values. The result is a very good dynamic response. In this paper, we address the direct instantaneous thrust control of a 3-phase 6/4 linear switched reluctance actuator (LSRA) by Pulse-width modulation (PWM) duty ratio adjustment, using the MATLAB simulation environment. The machine is modeled by an analytical model that takes into consideration the non-linearity of the machine and relies in two lookup characteristic tables λ (x,i) and F(x,i), thus relating flux linkage and developed force, as functions of position and current, to estimate thrust.