Performance analysis of a 4-switch, 3-phase inverter based cost effective IPM motor drives

This paper presents a cost effective drive system for salient pole permanent magnet synchronous motor (PMSM) for high performance industrial drive systems. In the proposed approach, instead of a conventional 6-switch, 3-phase (SSTP) PWM inverter, a 4-switch 3 phase inverter (FSTP) is utilized. This reduces both the cost of the inverter and the computation for real-time implementation. The complete vector control scheme for the PMSM drive fed from the proposed FSTP inverter is implemented in real-time using digital signal processor (DSP) TI TMS320C31 for a prototype 1 hp motor. A performance comparison of the proposed FSTP inverter fed drive with a conventional SSTP inverter fed drive is also made in terms of speed response and total harmonic distortion (THD) of the stator current. Theoretical and experimental results of the proposed drive verify the robustness of the drive.