Evaluation method of energy consumption for permanent magnet synchronous motor drive system

This paper discusses an evaluation method of electric energy consumption of a permanent magnet synchronous motor (PMSM) drive system. The calculation method of the energy consumption based on an efficiency map is proposed. First, it is confirmed that the error ratio between the calculation result and the measurement result is less than 5%. In addition, the energy consumption of the PMSM drive system for actual hybrid electric vehicles is calculated by the proposed method. As a result, it is clarified that when the three-level inverter is employed, the energy consumption decrease ratio compared with the two-level inverter in the light load region is higher than that in the heavy load region.