Abstract
A fault tolerant control strategy for dual three-phase permanent magnet synchronous motor (DTP-PMSM) with 0° phase shifting between two windings is proposed in this paper. When a DTP-PMSM suffers from single- or two-phase open-circuit fault, to maintain the torque performance, current in faulty phase must be compensated by other healthy phases, which causes asymmetric self- and mutual inductances. Therefore, the 2nd harmonic component can be observed in the dq -axis currents and torque ripple also increases. To analyse this harmonic component in two types of faults, post-fault model of no-phase-shifting DTP-PMSM based on vector space decomposition (VSD) method is built in this paper. Then, proportion-integral-resonant (PIR) controller which can be used to suppress the specific periodic disturbance is applied to compensate the 2nd harmonic components. As the resonant controller is rarely dependent on motor parameters, phase and amplitude of current harmonic, the PIR controller can be applied in no-phase-shifting DTP-PMSM to suppress the harmonic caused by single- and two-phase open-circuit faults. The experimental results validate the effectiveness of the proposed fault tolerant control under single- and two-phase open-circuit faulty conditions.
Highlights
Multiphase machines are widely used in industrial applications such as aerospace and traffic because of excellent fault tolerant ability which ensures multiphase machines to work reliably
In this paper, the PIR controller is applied in DTP-PMSM with 0◦ phase shifting fault tolerant control to suppress the current harmonics and torque ripple caused by single- and two-phase open-circuit faults
The PIR controller is applied in fault tolerant control to suppress the 2nd harmonic disturbance in the dq-axis currents caused by asymmetric inductance
Summary
Multiphase machines are widely used in industrial applications such as aerospace and traffic because of excellent fault tolerant ability which ensures multiphase machines to work reliably. It cannot be applied to DTP motors with 0◦ phase shifting because fundamental and harmonic sub-planes transformed by VSD method are dependent in these motors Another control method widely used for DTP-PMSMs is the two-individual current control method [9], [10], in which two sets of windings are controlled separately. The PIR controller can be employed into current loop of vector control [24], [25] and suppress the current harmonic under different open-circuit faulty conditions It lacks research in no-phase-shifting DTP-PMSM fault tolerant control. In this paper, the PIR controller is applied in DTP-PMSM with 0◦ phase shifting fault tolerant control to suppress the current harmonics and torque ripple caused by single- and two-phase open-circuit faults. The equivalent PMSM will be further used to analyse the 2nd harmonic in faulty model
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