Abstract
This paper presents the design and optimization of a 1-MW inverter for a high-speed, high-specific-power motor drive. The proposed inverter consists of ten 100-kW inverter sets distributed around the periphery of the machine to drive ten separate sets of three-phase open-ended windings. Each inverter set consists of three single-phase full-bridge inverters each of which drives an open-ended phase winding. The use of three single-phase full-bridge inverters for each inverter set yields an improved specific power as compared to either the three-phase bridge inverter or the active neutral-point clamped (ANPC) inverter in the target application. The proposed inverter system is co-designed and co-optimized with a 1-MW permanent magnet machine and associated thermal management system. Experimental results demonstrating the performance of a 100-kW inverter set are provided. The air-cooled inverter set operates at 720 Vdc, 73.5 Aac,rms per phase and 80 kHz device switching frequency, and achieves 53.4 kW/kg specific power and > 98% efficiency.
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