Five-Phase IPMSM: Torque Density Improvement by Third Harmonic Injection

Spas, Sachar; Kowarschik, Sebastian; Laumer, Josef; Wiesinger, Michael; Hackmann, Wilhelm

doi:10.1109/speedam48782.2020.9161863

Cited by 4 publications

(2 citation statements)

References 17 publications

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“…For example, in [56]- [58], a multi-layer design shows a further reduction in the overall rotor losses, unbalanced magnetic pull, and torque ripple. On the other hand, for the present calculation, the current is purely sinusoidal; thence, a harmonic injection control system may reduce the losses and improve the overall performance of the machines [12], [13], [15], [25], [59]- [64]. Moreover, the number of phases can be considered according to the number of parallel-and series-connected converters [65].…”

Section: Discussionmentioning

confidence: 99%

Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

Tome

Nilssen

Nøland

2022

IEEE Trans. Appl. Supercond.

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In this paper, an AC superconducting multi-phase symmetric-winding machine is designed for a wind power generator to improve its performance and reduce losses, where four handpicked topological designs were explored and compared. In particular, it is found that using high-phase order of unique phasors further improves the performance. The iron losses are reduced, and the rippling behavior is lowered due to the smoother airgap magnetic flux density. Furthermore, a higher least-common-multiple (LCM) is achieved due to a better slot-pole combination for fractional-slot concentrated windings without having space sub-harmonics. Nonetheless, it is shown that creating a smooth airgap magnetic flux density does not improve the AC hysteretic superconducting losses; thus, further research is needed using additional approaches. Moreover, it is found that the Meisner effect is present in the machine and is inversely proportional to the AC hysteretic superconducting losses. Finally, the work shows that a 13-phase AC-superconducting machine can achieve a theoretical limit approaching 101.70 Nm/kg for the torque-to-weight ratio, outperforming classic winding layouts.

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Section: Discussionmentioning

confidence: 99%

Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

Tome

Nilssen

Nøland

2022

IEEE Trans. Appl. Supercond.

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“…Multiphase machines have a higher winding distribution factor than three-phase machines with the same number of slots per pole and phase in addition to the same relative coil pitch The publications that deal with additional degrees of freedom usually focus on the increase in power density due to harmonic injection and the calculation of the ideal ratio between time harmonics [7,9,10] or design of the specific electric machine that uses the additional degrees of freedom [11][12][13][14][15]. Papers dealing with the calculation of the equivalent circuit parameters are mostly focused on the fundamental harmonic component and they describe changes that occur with a higher number of phases [8,16,17].…”

Section: Winding Distribution Factormentioning

confidence: 99%

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

2021

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The usage of multiphase electrical drives expands the operation possibilities of electrical machines and opens new directions of research on inverter-fed electrical machines. With an increasing number of phases, the standard approach of the electromagnetic design of machines has to be generalized to m-phase systems, which is not usually respected in the literature focused on electric machine design, and it is rarely published. This paper summarizes the specific problems linked with the design of machines with different numbers of phases, focusing on the winding design and the calculation of equivalent circuit parameters. In addition to the direct effect of different numbers of phases, the impact of injecting higher order time harmonic components on the electromagnetic design of electric machines is analyzed. The obtained analytical results are verified by the measurement of a nine-phase experimental induction motor.

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Survey of Third Harmonic Voltage Injection in Star-Connected Five-Phase Windings for Induction and Permanent Magnet Synchronous Machines

Moller

Binder

2022

2022 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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Five-Phase IPMSM: Torque Density Improvement by Third Harmonic Injection

Cited by 4 publications

References 17 publications

Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

Comparison of AC-Superconducting Multiphase Symmetric-Winding Topologies for Wind Power Generators With PM Rotors

Challenges in the Electromagnetic Design of Multiphase Machines: Winding and Equivalent Circuit Parameters

Survey of Third Harmonic Voltage Injection in Star-Connected Five-Phase Windings for Induction and Permanent Magnet Synchronous Machines

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