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A R T I C L E I N F O A B S T R A C T Article history: Received: 06 March, 2018 Accepted: 15 April, 2018 Online: 30 April, 2018 This paper presents a novel direct torque control (DTC) strategy aimed to four-switch threephase (FSTP) inverter-fed an interior permanent magnet synchronous machine (IPMSM), using a fuzzy logic toolbox in speed control loop. In fact, the introduced DTC approach is based on the emulation of the operation of the standard six-switch three-phase (SSTP) inverter. This fact has been produced thanks to suitable combinations of four unbalanced voltage vectors intrinsically generated by the FSTPI, leading to the synthesis of six balanced voltage vectors yielded by the SSTPI. It has been found from the simulation results that the adaptive fuzzy speed controller implemented for basic and proposed DTC strategies dedicated to FSTPI-fed an IPMSM drives, exhibits interesting performances over different operating conditions, more robustness and less steady-state error especially when there exist motor parameter uncertainties and unexpected load changes occur, compared to the ones yielded by the conventional proportional-integral controller.

Direct Torque Control Strategy Based on the Emulation of Six-Switch Inverter Operation by a Four-Switch Inverter Using an Adaptive Fuzzy Controller