Abstract
In this paper, a nonlinear high order sliding mode (HOSM) controller and an adaptive interconnected observer for sensorless interior permanent magnet synchronous motors (IPMSM) are designed. A maximum-torque-per-ampere strategy (MTPA) is used to compute direct rotor current reference. The high order sliding mode controller is designed in order to ensure finite-time convergence of sliding variables and its high order time derivatives despite parameter uncertainties and unknown load torque. The adaptive interconnected observer estimates the currents, the angular velocity, the position, the load torque and the stator resistance. By Lyapunov theory, the observer-controller stability is proved. Simulation results confirm the effectiveness of the proposed method.
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