Abstract
This study proposes an approach for the fault-tolerant control of an interior permanent magnet synchronous motor (IPMSM) drive when a power switch open-circuit fault occurs without addition of any extra hardware or reconfiguration to the inverter. With this approach, the IPMSM's operation effectively alternates between the three-phase mode and the two-phase mode. Thus, the electric power is evenly distributed between three-phase windings as much as possible, and the remaining healthy power devices are all utilised. The post-fault drive performance is analysed. A simulation model has been built to verify the proposed principle. Finally, the approach has been implemented on an IPMSM test rig. Both the simulation and experimental results confirm the feasibility of the method.
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