Optimal LQI Synthesis for Speed Control of Synchronous Actuator under Load Inertia Variations

Direct drives applications are more and more common and rise up the control weakness to parameters variation. New method have been created but are most of time complex to tune and need powerful processor. In this paper, state feedback controllers optimized by Linear Quadratic principle are shown up. These methods achieve cost requirements due to constant gain coefficients. Methods tune criterion to let the closed loop stable and unsensitive to load variation. The first one uses an iterative algorithm on few tuned parameter. The last one blends poles placement and Linear Quadratic principle to achieve a fast synthesis method. Experimental results have been obtained taking into account internal current control and inverter limitation.