Magnet shifting for back EMF improvement and torque ripple reduction of a TORUS‐type nonslotted axial flux permanent magnet machine

Mirzahosseini, Reza; Darabi, Ahmad; Assili, Mohsen

doi:10.1002/2050-7038.12293

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…The idea of rotor disks shifting has been studied in [23] for torque ripple reduction of axial flux induction motors and in [24, 25] for EMF waveform improvement of slotless AFPMs. However, its effects on cogging torque reduction of PM machines with magnetically decoupled phases have not been addressed, yet.…”

Section: Design Modification Approachesmentioning

confidence: 99%

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Gharehseyed

Vahedi

Nobahari

et al. 2020

IET Electric Power Applications

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Ring winding axial flux permanent magnet (PM) machine (RWAFPM) has recently been introduced, which is beneficial in terms of manufacturability and fault tolerability. This study aims to examine the use of RWAFPM for a small‐scale direct‐drive wind generator. The structural features of the RWAFPM make it subjected to remarkable cogging torque. Accordingly, the main efforts of this study are focused on finding a proper solution for its torque profile challenges. In this regard, extensive investigations are carried out on rotor design improvements. First, several schemes are analysed, separately, including pole skewing, pole arc ratio modifying, pole grouping and rotor disks shifting. Then an optimum combination of selected schemes is calculated by the Taguchi method and considering the mean torque value as well as the PM usage. It is demonstrated that significantly improved results could be achieved mainly through cost‐effective modified fabrication. The 3D finite element models are employed throughout the study along with some experimental measurements to verify the results.

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Section: Design Modification Approachesmentioning

confidence: 99%

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Gharehseyed

Vahedi

Nobahari

et al. 2020

IET Electric Power Applications

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“…The flux path of DSSR is much more complex as compared to a torus motor [24]. On the other hand, the torus motor has a compact structure with easy manufacturability, with an appropriate self-ventilating duct that leads the machine to higher performance [25,26]. Research is carried out on the different types of winding configurations such as concentrated winding, overlap winding, drum winding, closed form solution, and toroidal winding.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Three Phase Axial Flux Permanent Magnet Machine with Different PM Shapes for Electric Vehicles

et al. 2022

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Axial flux permanent magnet (AFPM) machines are good candidates for electric vehicle applications due to their high torque density, improved efficiency, and better flux distribution; thus, they are often used. A dual-rotor single-stator AFPM machine with four differently shaped permanent magnet (PM) rotors is investigated. The main aim of this paper is to enhance the average torque while minimizing the cogging torque and torque ripples at the expense of low PM volume. The proposed machines are analyzed in terms of flux linkage, back-EMF, cogging torque, average torque, and torque ripples. The analysis reveals that the machine with an arc-shaped PM rotor performs better than the others. In addition, the trapozoidal arc-shaped PM used in the AFPM machine outperforms the hexagonal, skew arc, and traditional trapezoidal PMs. The torque density of the trapezoidal-shaped PM machine is 40.23 (KNm/m3), while that of the hexagonal shape is 32.46 (KNm/m3), that of the skew arc shape is 39.78 (KNm/m3), and that of the arc shape is 50.38 (KNm/m3).

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“…In order to investigate the amplitudes of back EMF waveforms, E-core topology and C-core topology of switch flux hybrid magnet memory (SFHMM) machine are analyzed [13]. Besides, the sinusoidal degree of back EMF waveforms of traditional flux switch permanent magnet machines are optimized by pole-arc [14,15], axial magnetization and halbach permanent magnet arrays [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Experimental Validation of a Flux Switching Permanent Magnet Memory Machine

Chen

Cui

2020

IEEE Access

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Compared with the traditional flux switching permanent magnet machine, flux switching permanent magnet memory (FSPMM) machine has two kinds of permanent magnets, flux regulating windings and complex flux path. In this paper, a three phase FSPMM machine with 12 stator slots and 14 rotor poles is optimized by numerical simulation software. After the pole-arc optimization, there is only one suitable skewed slot degree of rotor that can further increases the sinusoidal degree of back electromotiveforce (EMF) of FSPMM machine, and decreases the amplitude of EMF slightly. Besides, the flux regulating of FSPMM machine includes enhance flux is analyzed by numerical simulation software. Lastly, a prototype of FSPMM machine is constructed, and the obtained numerical simulation results are verified by experimental tests. The simulation and experimental results may be benefit for the research of operational control, flux regulation and industry application of FSPMM machine in future.

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Magnet shifting for back EMF improvement and torque ripple reduction of a TORUS‐type nonslotted axial flux permanent magnet machine

Cited by 9 publications

References 23 publications

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Design and Analysis of Three Phase Axial Flux Permanent Magnet Machine with Different PM Shapes for Electric Vehicles

Numerical Simulation and Experimental Validation of a Flux Switching Permanent Magnet Memory Machine

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