Fault-Tolerant Control Method Using Tangential Weighting to Improve Torque per Ampere for Medium-Voltage Drives Under Multi-Phase Open Fault Condition

Among various transportation mediums using medium-voltage drive, submarines require additional covert maneuverability and high reliability. However, when an electrical failure situation occurs and torque ripple occurs, the operating noise of the motor increases. In particular, the loss of a phase due to an open failure of the motor affects reliability. Therefore, this paper aims to improve reliability by reducing the torque ripple component caused by open-circuit failure and minimizing the increase in phase current. The proposed control method was verified using Hardware-In-the-Loop (HIL) equipment.