Zero Torque Ripple Operation of Seven-phase Concentrated-full-pitch Winding Induction Motor Under Open Circuit faults

In order to achieve zero torque ripple operation of seven phase concentrated-full-pitch winding induction motor under single phase open, the fundamental stator current space vector of the conventional strategy is controlled to move along the circular anticlockwise trajectories. However, according to the steady state model in terms of symmetrical components, there are still other possible fundamental current commands to achieve the zero torque ripple. In this digest, all possible fundamental current commands are deduced and their performance in terms of average torque, total loss (stator loss and rotor loss) and efficiency are compared. Furthermore, zero torque ripple operation can be also achieved with two phase open and this is not reported in the previous literatures. In addition, the possibility of zero torque ripple operation in terms of two more phase open conditions and harmonic current injection is discussed. Finally, the optimum control strategies are selected and their effectiveness is verified through the simulation analysis.

[1]  Ahmed S. Morsy,et al.  Effect of Stator Winding Connection on Performance of Five-Phase Induction Machines , 2014, IEEE Transactions on Industrial Electronics.

[2]  Jin Huang,et al.  Post-fault operation for five-phase induction machines under single-phase open using symmetrical components , 2018, 2018 IEEE Applied Power Electronics Conference and Exposition (APEC).

[3]  Ronghai Qu,et al.  Investigation of Spatial Harmonic Magnetic Field Coupling Effect on Torque Ripple for Multiphase Induction Motor Under Open Fault Condition , 2018, IEEE Transactions on Power Electronics.

[4]  Federico Barrero,et al.  Recent Advances in the Design, Modeling, and Control of Multiphase Machines—Part I , 2016, IEEE Transactions on Industrial Electronics.

[5]  Emil Levi,et al.  Multiphase Electric Machines for Variable-Speed Applications , 2008, IEEE Transactions on Industrial Electronics.

[6]  Federico Barrero,et al.  Recent Advances in the Design, Modeling, and Control of Multiphase Machines—Part II , 2016, IEEE Transactions on Industrial Electronics.

[7]  Hamid A. Toliyat,et al.  Resilient current control of five-phase induction motor under asymmetrical fault conditions , 2002, APEC. Seventeenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.02CH37335).

[8]  Jin Huang,et al.  A novel third harmonic current injection method to optimize the air-gap flux for multiphase induction machine , 2017, 2017 20th International Conference on Electrical Machines and Systems (ICEMS).

[9]  Cai Wei,et al.  A novel control strategy for five-phase concentrated full-pitch windings induction motor under open-phase fault , 2011, 2011 IEEE International Conference on Mechatronics and Automation.

[10]  B. W. Williams,et al.  Improved Flux Pattern With Third Harmonic Injection for Multiphase Induction Machines , 2012, IEEE Transactions on Power Electronics.

[11]  Frede Blaabjerg,et al.  Comparative study of different fault-tolerant control strategies for a five-phase concentrated-full-pitch winding induction motor , 2019, 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe).

[12]  D. Casadei,et al.  Control of Multiphase Induction Motors With an Odd Number of Phases Under Open-Circuit Phase Faults , 2012, IEEE Transactions on Power Electronics.

[13]  Seungdeog Choi,et al.  Open-Phase Fault Detection of a Five-Phase Permanent Magnet Assisted Synchronous Reluctance Motor Based on Symmetrical Components Theory , 2017, IEEE Transactions on Industrial Electronics.