Design and comparison of dual‐stator axial‐field flux‐switching permanent magnet motors for electric vehicle application

Farrokh, Fariba; Vahedi, Abolfazl; Torkaman, Hossein; Banejad, Mahdi

doi:10.1049/els2.12074

Cited by 8 publications

(2 citation statements)

References 24 publications

(51 reference statements)

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“…The axial field flux-switching permanent magnet (PM) (AFFSPM) motors, combining the advantages of axial-flux machines and PM motors, are potential candidates for electric vehicles, industrial applications wherever high torque density, high efficiency and high-power density are significant. Thus, it is necessary to evaluate the performances of these machines during the design process in magnetic field modelling [1,2].…”

Section: Introductionmentioning

confidence: 99%

A 2D hybrid analytical electromagnetic model of the dual‐stator axial‐field flux‐switching permanent magnet motor

Farrokh,

Vahedi,

Torkaman

et al. 2023

IET Electric Power Appl

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The two‐dimensional (2D) analytical model for the calculation of the components of the flux density distribution in the air gap in a dual‐stator axial‐field flux‐switching permanent magnet (PM) motor (DSAFFSPM) is presented. The novelties of this study are deriving a 2D hybrid analytical model and replacing the rotor teeth with some surface currents for the calculation of air‐gap magnetic flux density for the first time in the DSAFFSPM motor. The 2D analytical model for DSAFFSPMs is more challenging due to the doubly salient structure and inner PM of the stator. 1D analytical interior PMs are first transferred to the bore of the stator body using the magnetic equivalent circuit model (MEC). Next, the effects of the rotor teeth are taken into consideration by injecting virtual surface currents for 2D analytical model. Applying boundary conditions and solving the Laplace/Poisson equations, the vertical and tangential flux components of the flux density distribution in the air‐gap DSAFFSPM motor are computed. The verification of the proposed method and the obtained results are validated by the 3D finite element method.

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Section: Introductionmentioning

confidence: 99%

A 2D hybrid analytical electromagnetic model of the dual‐stator axial‐field flux‐switching permanent magnet motor

Farrokh,

Vahedi,

Torkaman

et al. 2023

IET Electric Power Appl

Self Cite

View full text Add to dashboard Cite

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“…In this regard, some references such as [4,5] have gone to less rare earth pm motors to reduce the cost, while the use of this pm will reduce the density of the electromagnetic torque of the electric vehicle propulsion motor, which is not desirable. Axial Flux-Switching permanent magnet (PM) (AFSPM) motors have attracted attention due to their ability to focus high flux, good efficiency, better heat transfer, short axial length, compact structure, and lightweight compared to some radial flux machines [6,7]. In some of these structures, high power density, high torque density, good flux attenuation capability, and sinusoidal back EMF voltage waveform make these motors a good-looking option for applications, such as electric vehicles, wind turbines and flywheel storage systems [8].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous improvement of cogging torque and torque density in axial flux‐switching permanent magnet motor

Ebrahimi,

Torkaman,

Javadi

2023

IET Electric Power Appl

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Axial Flux‐Switching Permanent Magnet motors are broadly used in various industrial applications due to their high torque density and low rotor inertia. However, one major drawback of these motors is their cogging torque, which results in torque ripple and vibration. Existing methods for reducing cogging torque have often led to a decrease in useful electromagnetic torque, thereby compromising motor efficiency. To address this issue, a novel hybrid structure for the simultaneous improvement of cogging torque and electromagnetic torque in Axial Flux‐Switching Permanent Magnet motors is presented. The proposed structure combines the optimal arc coefficient of the rotor pole technique with the notching rotor technique, resulting in a new motor configuration that exhibits both reduced cogging torque and increased torque density. Analytical equations for calculating cogging torque are derived, and 3D finite element analysis is conducted to evaluate the effectiveness of the proposed structure design. Furthermore, the optimal values of the arc coefficient and forming angle of the rotor pole are determined using the Taguchi analysis. Comparing the results of the optimal motor structure with the previous design shows that the new structure can improve the cogging torque, average electromagnetic torque, torque ripple, torque density, and peak torque output of the motor, which confirms the effectiveness of the proposed structure.

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Design and Experimental Validation of a New Outer Rotor Double PM Excited Flux Switching Generator for Direct Drive Wind Turbines

Farahzadi,

Ali,

Mirnikjoo

et al. 2024

IEEE Access

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An outer rotor double permanent magnet (PM) excited flux switching generator is designed and optimized in this paper for direct drive wind turbine applications. This generator consists of two sets of PMs: ferrite PMs embedded in the stator yoke and neodymium PMs sandwiched between the rotor segments. In this regard, the main justification for employing ferrite PMs in the stator yoke is that the risk of demagnetization of ferrite PMs at high temperatures is lower than that of neodymium PMs (the temperature of the machine's stationary parts is higher than that of its rotating parts). For the design of the machine, the Taguchi design of experiments is deployed, while a decision-making algorithm based on the technique for order of preference by similarity to the ideal solution is used to solve the contradiction that results from the Taguchi design of experiments in the multi-objective design optimization process. During the multi-objective design optimization steps, simultaneously maximizing the no-load phase voltage and minimizing the cogging torque and total harmonic distortion of the no-load phase voltage are defined as the objective functions. The optimally designed machine is prototyped

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Design and comparison of dual‐stator axial‐field flux‐switching permanent magnet motors for electric vehicle application

Cited by 8 publications

References 24 publications

A 2D hybrid analytical electromagnetic model of the dual‐stator axial‐field flux‐switching permanent magnet motor

A 2D hybrid analytical electromagnetic model of the dual‐stator axial‐field flux‐switching permanent magnet motor

Simultaneous improvement of cogging torque and torque density in axial flux‐switching permanent magnet motor

Design and Experimental Validation of a New Outer Rotor Double PM Excited Flux Switching Generator for Direct Drive Wind Turbines

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