Fault-Tolerant Optimization Control of Open-Winding Dual Three-Phase PMSM Drives in Full Operation Range

Open-winding dual three-phase permanent-magnet synchronous motor (DTP-PMSM) has high fault-tolerant capability because of its sufficient control degrees of freedom. This article proposes an optimization control scheme to explore the fault-tolerant capability of open-winding DTP-PMSM drives with open-phase fault in full operation range. First, the relationships between the operation states and minimum-copper-loss (ML) fault-tolerant mode and maximum-torque (MT) fault-tolerant mode are analyzed in detail. Three optimization problems are then formulated based on the objectives for each operation state, which can be effectively solved by utilizing the interior point method. Compared to the existing MT and ML schemes, the proposed scheme can achieve the theoretical highest torque output capability and lowest copper loss in full operation range. Comprehensive experimental results are presented to substantiate the effectiveness and superiority of the proposed fault-tolerant optimization control scheme.