Implementation of sensorless direct torque control using matrix converter fed Interior permanent magnet synchronous motor

This paper presents a sensorless direct torque control method for matrix converter fed interior permanent magnet synchronous machine. The matrix converter is split into rectifier and inverter stages based on the Indirect Space Vector Modulation theory. Therefore, the hysteresis flux and torque control is achieved by selecting one of the six active and two zero voltage vectors in the inverter stage while the input power factor is simultaneously controlled by applying two input current vectors in the rectifier stage. Two active or one zero switching combination is employed at each control cycle. This method allows a reduction of the harmonic content of the input current and ripples in the torque using a four-level hysteresis comparator without compromising the simplicity and high dynamics of the original hysteresis-band-based DTC scheme. Simulation and experimental results are shown to identify the effectiveness and improvement of the proposed method.