A study on design of inverter for multi-phase brushless DC ship propulsion motor

This paper describes inverter for multi-phase brushless DC ship propulsion motor. This inverter has high efficiency and relatively small size. It is separated multi-phase brushless DC motor drive and motor-inverter built-in type. Some inverter modules are damaged, the motor can be limited drive by other living inverters. In order to maintain high efficiency at low speed, same phase coils of different group are connected in series and excited by the half number of inverters than at high speed operation. Power module cooling system is circulated fresh water. Number of kW-class downsized inverter was made for study of operating algorithm. In this research deals number of MW-class inverter system design, manufacture and test.