Simulation of Four Switch Three Phase Inverter fed Synchronous Reluctance Motor (SRM)

This paper proposes a vector control of Synchronous Reluctance Motor (SRM) which is fed from a Four Switch Three Phase Inverter (FSTPI) instead of Six Switch Three Phase Inverter (SSTPI). For any three phase inverter require six switches, but these switches are reduced to four. This reduction of power switches from six to four improves the reliability of the inverter, size of the inverter is reduced and cost of the inverter is also reduces. The SRM stator flux and its position to process the speed error of the SRM is estimated by the control system. The proposed drive system is developed by simulation model. The switching for the inverter is given by using the two independent hysteresis current controllers with a suitable hysteresis band. SSTPI-fed SRM and FSTPI-fed SRM is compared in this paper. This system is tested under different conditions to find out the toughness. Simulation results show that the proposed system having a quicker speed response and the disturbance in the motor is also reduces.