Five-phase permanent-magnet synchronous motors(PMSMs)offer high fault tolerance,low torque ripple,and high torque density.An open-circuit fault results in an asymmetric motor model,which causes direct current(DC)bias ...Five-phase permanent-magnet synchronous motors(PMSMs)offer high fault tolerance,low torque ripple,and high torque density.An open-circuit fault results in an asymmetric motor model,which causes direct current(DC)bias and harmonics,thus affecting operational performance with sensorless control under fault-tolerant conditions.To improve operational performance,this study proposes a novel sliding mode observer(SMO)based on an enhanced adaptive complex-coefficient filter(EACCF)for the sensorless vector-control strategy of a five-phase PMSM with an open-circuit fault.The novelty of the proposed strategy is the development of the EACCF,which is characterized by an effective DC bias and harmonic-attenuation capability.Additionally,the fundamental back electromotive force can be estimated without phase lag or amplitude attenuation using the SMO.By incorporating a phase-locked loop,the accuracy of position estimation can be improved under both healthy and open-circuit fault conditions.The sensorless control can not only restrain the fluctuating torque caused by open-circuit faults but also offers good steady-state and dynamic performances under healthy and open-circuit fault conditions.Experimental results are presented to demonstrate the feasibility of the proposed method.展开更多
基金Supported by the National Natural Science Foundation of China(52277052).
文摘Five-phase permanent-magnet synchronous motors(PMSMs)offer high fault tolerance,low torque ripple,and high torque density.An open-circuit fault results in an asymmetric motor model,which causes direct current(DC)bias and harmonics,thus affecting operational performance with sensorless control under fault-tolerant conditions.To improve operational performance,this study proposes a novel sliding mode observer(SMO)based on an enhanced adaptive complex-coefficient filter(EACCF)for the sensorless vector-control strategy of a five-phase PMSM with an open-circuit fault.The novelty of the proposed strategy is the development of the EACCF,which is characterized by an effective DC bias and harmonic-attenuation capability.Additionally,the fundamental back electromotive force can be estimated without phase lag or amplitude attenuation using the SMO.By incorporating a phase-locked loop,the accuracy of position estimation can be improved under both healthy and open-circuit fault conditions.The sensorless control can not only restrain the fluctuating torque caused by open-circuit faults but also offers good steady-state and dynamic performances under healthy and open-circuit fault conditions.Experimental results are presented to demonstrate the feasibility of the proposed method.
