Synthesis of Flux Switching Permanent Magnet Machines

Li, Dawei; Qu, Ronghai; Li, Jian; Xu, Wei; Wu, Leilei

doi:10.1109/tec.2015.2458312

Cited by 126 publications

(42 citation statements)

References 24 publications

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“…On the other hand, the air gap permeance function that represents the magnetic length distribution (in fact, its reciprocal) in the air gap is very useful for expressing the air flux density in an analytical form, especially for uneven gaps [14]. In reference [15], the air gap magnetic flux density and the back EMF equation were presented by using this air gap permeance function for the analysis of the FSPM motor; however, they were not detailed enough to allow precise calculations, because the primary concern of the study was the overall design of the FSPM machine, not an accurate analysis. Especially, in the flux density equation, the magnet thickness between the stator core segments was neglected for convenience, which caused inaccuracy in the flux density calculation.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Azeem

Kim

2019

Energies

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This paper aims to present a general and effective analytical approach to calculate the air gap flux density and the back electromotive force (EMF) of a flux-switching permanent magnet (FSPM) machine. The proposed analytical expression of the air gap flux density is based on an improved air gap permeance function considering the geometries of slotted stator core pieces and magnets between stator teeth as well as the salient rotor poles. The back EMF equation is accurately derived using the proposed air gap flux density equation expressed in terms of practical machine dimensions and thus it provides the key design factors as well as details of the back EMF production mechanism. To validate the proposed analytical expressions, they are applied to the case study of a 12-slot 10-pole FSPM machine, and the finite element analysis results confirm the analytical predictions. Besides, for the proposed analytical model, the effects of the machine's geometries on back EMF characteristics are investigated. The investigation shows that the ratio of rotor slot opening to slot pitch has a significant effect on the back EMF, and its optimal value is suggested. The proposed equations also provide a mean to choose the slot and pole combinations to obtain a higher power density.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Azeem

Kim

2019

Energies

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“…Accordingly to the PM position, the DS machines [7]- [20] can be generally categorized as rotor-PM [7]- [12] and stator-PM [13]- [21] topologies. For the rotor-PM machines [7]- [12], the thermal management and protection issues associated with the PMs tend to be problematic issues for the DS machine with cantilever cupped rotor.…”

Section: Introductionmentioning

confidence: 99%

Novel Dual-Stator Machines With Biased Permanent Magnet Excitation

Yang

Lyu

Lin

et al. 2018

IEEE Trans. Energy Convers.

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This paper proposes high-torque-density dual stator permanent magnet machines with biased permanent magnet (PM) excitation in the inner stator. The developed machine can be geometrically considered as an outer-rotor stator PM machine plus a separate outer stator similar to the conventional fractionalslot machines. Consequently, the proposed designs feature two different stator structures. Meanwhile, two sets of armature windings are employed to improve the space utilization ratio and torque density. The machine topologies and operating principles are first described. In addition, the analytical models of the machine are introduced, which are utilized to optimize the stator/rotor pole combination as well as the power splitting ratio between two stators. This design optimization is performed in order to maximize the torque capability with the constraint of copper loss. The electromagnetic characteristics of the proposed machine with different inner stator structures are evaluated and compared by the finite-element (FE) method. Finally, an optimized DS-BPMM prototype is manufactured and tested to verify the FE analyses.

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“…While, single-phase FEFSM with overlap windings technique for low cost and low torque applications such as axial fan and pump have been introduced in 2003 [12]. Regarding [13] and [14], motor with overlap windings have higher torque density due to an improved pitch factor. In addition, the motor with overlap windings has also high average torque and power performances due to high winding inductance and high flux linkage [15].…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison between Salient and Segmental Rotors Single-Phase FEFSM Using Non-Overlap Windings for Home Appliances

Omar¹,

Sulaiman²,

Soomro³

et al. 2018

IJET

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Field excitation flux switching machines (FEFSMs) in which their torque performance produced by interaction between armature and field excitation (FE) coils have been widely designed for various applications. In this regard, three-phase salient rotor FEFSM with overlap windings is considered the most suitable candidate for high speed applications because of their advantages of flux controllability, and robust due to single piece of rotor structure. However, the overlap windings cause a high copper loss, hence efficiency of the motor becomes low and higher stack length. Besides, the salient rotor structure is found to produce low torque performance due to the longer flux path in stator and rotor yielding weak flux linkage. In this paper, a new single-phase FEFSM using non-overlap windings between armature coils and FE coils is proposed. Both non-overlap windings FEFSMs with salient and segmental rotors have been designed using JMAG Designer version 15 and the investigation process is conducted via 2D finite element analysis. The proposed motor performances verification has been done by comparing the results of flux linkage, flux line and distribution, flux strengthening, various torque capability, and torque-power versus speed characteristics. As a conclusion, single-phase non-overlap windings FEFSM using segmental rotor with power, torque and speed capabilities of 277.5 W, 0.91 Nm and 2,899 rpm, respectively considered as the best candidate for low torque high speed applications.

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Synthesis of Flux Switching Permanent Magnet Machines

Cited by 126 publications

References 24 publications

Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Electromagnetic Analysis and Performance Investigation of a Flux-Switching Permanent Magnet Machine

Novel Dual-Stator Machines With Biased Permanent Magnet Excitation

Performance Comparison between Salient and Segmental Rotors Single-Phase FEFSM Using Non-Overlap Windings for Home Appliances

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