Position Estimation of Fault‐Tolerant Permanent Magnet Motor in Electric Power Propulsion Ship System

Bai, Hongfen; Bo, Yu

doi:10.1002/tee.23579

Cited by 3 publications

(1 citation statement)

References 36 publications

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“…A A e i is equal to zero, and the output torque is no longer conserved. From reference [27], the current of the remaining five normal phases is used to compensate phase A in  SRF, which can ensure that the vector composition effect is unchanged and the output torque is conserved. In this paper, it is improved and applied to short-circuit fault.…”

Section: Short-circuit Fault-tolerant Control Strategymentioning

confidence: 99%

Research on Short-Circuit of Fault-Tolerant Permanent Magnet Rim Driven Motor Based on SPSRF-MPCC Algorithm

Liu,

Zhu,

Yue

et al. 2023

IEEE Access

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The conventional double-vector model predictive current control algorithm based on rotating reference frame (RRF-MPCC) which used in fault-tolerant permanent magnet rim driven motor (FTPM-RDM) has the problems of large output torque ripple and long selection time of optimal voltage vector. Therefore, two novel MPCC algorithms based on six-phase stationary reference frame (SPSRF) without coordinate transformation are proposed in this paper to reduce torque ripple and computation burden. Both methods use the simplest computational steps to achieve the most effective control. First came up with the method of single-vector SPSRF-MPCC algorithm which groups alternative voltage vectors according to the magnitude of load torque. The second method is an improved double-vector combination optimal SPSRF-MPCC algorithm which makes two independent rounds of current prediction for each stator winding and goes through 61 space voltage vectors only 30 times compared with 122 times of conventional double-vector SPSRF-MPCC which also requires coordinate transformation. In addition, the fault-tolerant control of one-phase shortcircuit is carried out with the current vector fault-tolerant control strategy. Finally, Through the comparison and verification of simulation and experiment, it is found that the double-vector SPSRF-MPCC algorithm can reduce the torque ripple and current fluctuation better, and it can improve the stability and robustness of the system no messing.INDEX TERMS Fault-tolerant permanent magnet rim driven motor (FTPM-RDM), Model predictive current control algorithm based on six-phase stationary reference frame (SPSRF-MPCC), current vector fault-tolerant (CVFT), Short-circuit fault.

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Section: Short-circuit Fault-tolerant Control Strategymentioning

confidence: 99%

Research on Short-Circuit of Fault-Tolerant Permanent Magnet Rim Driven Motor Based on SPSRF-MPCC Algorithm

Liu,

Zhu,

Yue

et al. 2023

IEEE Access

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Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL

Bai

2023

JMSE

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With the increasing use of electric propulsion ships, the emergence of the shaftless rim-driven thruster (RDT) as a revolutionary integrated motor thruster is gradually becoming an important development direction for green ships. The shaftless structure of RDTs leads to their dependence on position sensorless control techniques. In this study, a novel control algorithm using a composite sliding mode observer (SMO) with a modified feed-forward phase-locked loop (PLL) is presented for achieving high accuracy position and speed control of shaftless RDT motors. The deviation between the observed and actual currents is exploited to develop a current SMO to extract back electromotive force (back-EMF) errors. On this basis, a back-EMF observer is established to achieve accurate estimation of the back-EMF. The basic structure of the PLL was modified and incorporates a speed feedforward mechanism, which enhances the performance of rotor position estimation and facilitates bidirectional rotation. The stability of the algorithm has been verified in Matlab/Simulink for a range of steady-state, dynamic, and ship propeller loading conditions. Remarkably, the control algorithm boasts an impressive adjustment time of approximately 0.006 s and its position estimation error may be as low as 0.03 rad. Simulation results highlight the performance of the algorithm to achieve bidirectional rotation, while exhibiting fast convergence, minimal vibration, exceptional control accuracy, and robustness.

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Influence of Dual Air Gaps on Flux–Torque Regulation Hybrid Excitation Machine with Axial–Radial Magnetic Circuit

Dai,

Zheng,

Yuan

et al. 2024

WEVJ

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In this paper, a flux–torque regulation hybrid excitation machine (FTRHEM) with axial–radial dual air gaps, which can increase torque and regulate magnetic flux by changing the exciting current, is studied. Dual air gaps have a huge impact on the magnetic flux and additional torque. The effect of the air gap reluctances on the magnetic flux of the machine is obtained by establishing equivalent magnetic network models, which show that the dual air gaps are the key component in the axial–radial magnetic circuit. This study examines the flux regulation ability and the enhanced torque performance of an FTRHEM with dual air gaps. The mechanism by which the dual air gaps affect the machine’s magnetic field is clarified, and the constraints and relationships between the dual air gaps are explained, offering a theoretical foundation for future machine optimization. As the axial air gap decreases from 0.95 mm to 0.35 mm, the flux regulation capability improves from 15.44% to 26.51%, while the additional torque increases by 40.77%. Ultimately, prototypes are manufactured for experimental testing to validate the viability of the structure and the accuracy of the FEA for the FTRHEM featuring an axial–radial magnetic circuit.

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Position Estimation of Fault‐Tolerant Permanent Magnet Motor in Electric Power Propulsion Ship System

Cited by 3 publications

References 36 publications

Research on Short-Circuit of Fault-Tolerant Permanent Magnet Rim Driven Motor Based on SPSRF-MPCC Algorithm

Research on Short-Circuit of Fault-Tolerant Permanent Magnet Rim Driven Motor Based on SPSRF-MPCC Algorithm

Research on Position Sensorless Control of RDT Motor Based on Improved SMO with Continuous Hyperbolic Tangent Function and Improved Feedforward PLL

Influence of Dual Air Gaps on Flux–Torque Regulation Hybrid Excitation Machine with Axial–Radial Magnetic Circuit

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