Sensorless Fault-tolerant Control of a Nine-phase Permanent Magnet Synchronous Motor Based on Axes Transformation Under Open-circuited Fault
When open-circuit faults occur in the multi-phase permanent magnetic synchronous motor(PMSM),the current distortion and internal parameters variation of motor cause unpredictable disturbances to the system,which brings a challenge to the stable sensorless operation.To realize the online transition of fault tolerant control,this paper proposes a sensorless fault tolerant strategy of the multi-phase PMSM based on axes transformation.First,the reducing-order decoupled model of the postfault multi-phase PMSM is established using axes transformation.And postfault currents are refactored to guarantee the maximum torque output.The modeling approach applies to arbitrary open-circuit faults of the multi-phase PMSM.Also,the obtained mathematical model and current references would not vary with fault phase locations.On this basis,the modified sliding mode observer is established by the reducing-order decoupled model based on axes transformation,which improves the accuracy of rotor position estimation in the sensorless fault tolerant system.Finally,the effectiveness of the proposed control strategy is verified by open-circuit fault tolerant experiments with a 9 kW nine-phase PMSM.
multi-phase PMSMposition sensorless controlaxes transformationfault-tolerant control
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