Fault-Tolerant Control Methods for Reduced Torque Ripple of Multiphase BLDC Motor Drive System Under Open-Circuit Faults

Multiphase brushless direct current (BLdc) motors with high efficiency and power density are widely used in electric propulsion systems of a wide variety of applications including electric vehicles, submarines, and electric ships. The multiphase motors used in these applications must operate stably without generating large torque ripple in various fault scenarios. In this article, three fault-tolerant control (FTC) methods (minimum double phase, half phase, and multiple phases) are compared with reduce torque ripple by controlling the magnitude and phase angle of healthy phase currents under open-circuit failure. The proposed FTC methods were validated through the hardware-in-the-loop simulation of a 12-phase BLdc motor.