Development and Control of PMSM Drive With Improved Performance Over Wide Speed and Load Ranges

Generally, an inverter fed motor drive is often operated under low speed and/or light loads. Hence, except for good driving characteristics, having evenly high efficiencies over wide load range is also critical for a high-performance motor drive. A dual-inverter fed permanent-magnet synchronous motor (PMSM) drive achieving these goals is developed in this paper. First, the single-inverter fed drive is established with properly designed intelligent power module (IPM) based inverter schematic and control schemes. The dynamic modeling and systematic controller designs for current and speed control schemes are presented. Satisfactory dynamic and steady-state operating performances are verified experimentally. Next, the dual-inverter fed PMSM drive is constructed. The current sharing control and zero-sequence harmonic suppression approaches are proposed to yield improved performance. The robust current control is proposed to enhance the harmonic suppression response. Through the developed current robust error cancellation controller (CRECC), the robust and faster cancellation response is yielded. Finally, the motor drive efficiencies affected by power level, IPM type, inverter cell number, switching frequency, and DC-link voltage level are comparatively evaluated by measured results. Accordingly, the evenly high composite efficiencies over wide speed and load ranges are arranged.