Analysis of Dual Three-Phase Permanent-Magnet Synchronous Machines With Different Angle Displacements

Xu, P. L.; Feng, Jianghua; Guo, Shuying; Feng, Shouzhi; Chu, W. Q.; Ren, Yuan; Zhu, Z. Q.

doi:10.1109/tie.2017.2748035

Cited by 92 publications

(27 citation statements)

References 35 publications

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“…10 a and b , respectively. It can be seen that the short circuit current increases with the speed and it is the smallest one for the machine with 30° displacement, but it is the largest one for the machine with 15° displacement, which is different from the conclusion in [20]. This is due to the self‐inductance of the machine with 30° displacement is the largest, while it is the smallest one for the machine with 15° displacement.…”

Section: Analysis Of Electromagnetic Performancecontrasting

confidence: 68%

“…The electromagnetic performance of the machine with 0° and 30° displacements [17, 18] as well as the 20° displacement [19] were analysed, when they are operated under healthy and faulty conditions. In [20], the angle between the two sets of three phase winding is investigated and it is found that the PM machine with 30°displacement has the largest short circuit current, while it is the smallest one for the 15° displacement. In [21], the influence of the angle displacement on the electromagnetic performance under healthy and open‐circuit conditions is investigated without considering short circuit current as well as the braking torque.…”

Section: Introductionmentioning

confidence: 99%

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Effect of angle displacements on electromagnetic performance of dual three‐phase consequent‐pole permanent magnet machine

Wang

Zhang

et al. 2020

IET Electric Power Applications

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The machine with consequent pole (CP) rotor can improve the utilisation ratio of permanent magnet (PM). However, all the N poles or S poles are replaced by salient rotor iron, leading to the asymmetric air‐gap flux density. It potentially results in even‐order back electromotive force (back‐EMF) harmonics and unbalanced magnetic force. This study aims to investigate the influence of various angle displacements (i.e. 0°, 15°, 30° and 60°) on the electromagnetic performance of the dual three‐phase PM machine with CP rotor. The electromagnetic characteristics, including air‐gap flux density, back‐EMF, torque performance, short circuit current, braking torque and PM demagnetisation under both healthy and fault conditions are compared comprehensively. Finally, the 24‐slot/22‐pole prototype machine is manufactured. The back‐EMF waveforms and static torque are measured and compared to the finite‐element predicted results to validate the theoretical analysis.

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Section: Analysis Of Electromagnetic Performancecontrasting

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Effect of angle displacements on electromagnetic performance of dual three‐phase consequent‐pole permanent magnet machine

Wang

Zhang

et al. 2020

IET Electric Power Applications

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“…The above analysis shows that the SVPWM technique can be used if the circuit configuration in Figure 1b and coordinate transformation matrix (6) are used under stator one-phase open-circuit fault condition. The reference voltage vector Vref in the d-q plane is synthesized; in the z1-z2 plane, a smaller magnitude of Vref is better and a zero magnitude of Vref is the best to suppress the harmonic voltages of the stator.…”

Section: Construction Of Auxiliary Vectorsmentioning

confidence: 99%

“…Another advantage is that the higher power can be transmitted in the same voltage or current level condition because of the increase in number of the winding phase. The third advantage is that the machine can continuously run under phase-deficient conditions [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Six-Phase Space Vector PWM under Stator One-Phase Open-Circuit Fault Condition

et al. 2018

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The torque pulsation and speed pulsation of a six-phase induction machine with double Y-connected windings displaced by 30 • increase after one phase of the stator winding is open-circuited. To reduce the pulsations, a method of six-phase space vector pulse width modulation (PWM) with fault-tolerance is proposed. The star point of the open-circuit winding group is connected to the centre point of the converter DC voltage. The 32 column matrices, which represent 32 stator winding voltages, are mapped to the d-q and z 1-z 2 planes using a new five-dimensional orthogonal matrix; then, 32 basic vectors are obtained. By using an optimal model, six auxiliary vectors and an equivalent null vector are constructed, the magnitudes of which are all zero in the z 1-z 2 plane. By using the auxiliary vectors and equivalent null vector, the reference vector is synthesized, the zero magnitude of which in the z 1-z 2 plane can suppress the harmonic voltages, and the circular trajectory of which in the d-q plane can make the torque smooth. The simulation and experimental results show that the torque pulsation range and speed pulsation range of the proposed method with fault-tolerance are 30% and 25% of those of the classical method without fault-tolerance, respectively. Thus, the phase-deficient operation performance of the system is improved.

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“…It is noted that (2) can be simplified by ignoring the resistance and the leakage reactance of the PM generator. The specific short-circuit current was derived in [16]. From (2), it can be known that the short-circuit current actually depend on the no-load back-EMF and the inductance.…”

Section: Fault-tolerant Evaluationmentioning

confidence: 99%

Auxiliary teeth design to reduce short-circuit current in permanent magnet generators

Zhao

Tang³

et al. 2020

Trans. Electr. Mach. Syst.

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In this paper, a new auxiliary teeth structure is proposed for fault-tolerant permanent magnet (PM) generators, which can reduce the short-circuit currents. Firstly, the short-circuit current and the phase to phase isolation of the fault-tolerant generator are analyzed briefly. Secondly, the auxiliary teeth structure is optimized to improve fault-tolerant capability. Then, the PM generators with different stator structures are compared to evaluate the proposed auxiliary teeth structure. Four critical generator parameters are investigated, i.e. back-electromotive forces, short-circuit currents, stator magneto motive force (MMF) harmonics, and torque performances. The results show that the proposed structure has better fault-tolerant capability than the conventional two-layer windings. Moreover, the stator MMF harmonics can be suppressed. Furthermore, the cogging torque and torque ripple can be suppressed by adopting the proposed structure. Finally, the simulated results are given to validate the theoretical analysis. Index Terms-Auxiliary teeth, fault-tolerant generator, magneto motive force, torque, finite-element method, permanent magnet generator.

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Analysis of Dual Three-Phase Permanent-Magnet Synchronous Machines With Different Angle Displacements

Cited by 92 publications

References 35 publications

Effect of angle displacements on electromagnetic performance of dual three‐phase consequent‐pole permanent magnet machine

Effect of angle displacements on electromagnetic performance of dual three‐phase consequent‐pole permanent magnet machine

Six-Phase Space Vector PWM under Stator One-Phase Open-Circuit Fault Condition

Auxiliary teeth design to reduce short-circuit current in permanent magnet generators

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