DSP IMPLEMENTATION OF SPEED VECTOR CONTROL FOR SINGLE-PHASE INDUCTION MOTOR BASED ON PROPORTIONAL SLIDING MODE CONTROL LAW

The accuracy knowledge of some state variables and motor parameters is required to the design of an efficient decoupled block or an exact linearization step dedicated for the classical Field Oriented Control (FOC) strategies. The aim of this paper is the elaboration of FOC strategy with high tracking performances and free of the on line adjustable decoupled block to drive a Single-Phase Induction Motor (SPIM). A full digital implementation of a novel speed vector control strategy based on Sliding Mode Control (SMC), to drive a SPIM, is presented. Adopting a very simple sliding surface design, and with the aim to generate a control signal free of chattering, three controllers qualified as Proportional Sliding Mode Controller (PSMC) are investigated. Adaptive sliding gain is conceived to improve the speed trajectory tracking performances under load disturbances. The asymptotically stability of the adaptive sliding mode control system is proved by means of the Lyapunov stability approach. An experimental platform around DSP (dSPACE DS1104) is conceived to evaluate the real time implementation and the performances of the proposed speed vector control strategy. Simulation and experimental results highlight the effectiveness of the presented scheme and the performances of the adopted control law.