Rotor Eddy Current Losses Reduction in an Axial Flux Permanent Magnet Machine

Jara, Werner; Lindh, Pia; Tapia, Juan A.; Petrov, Ilya; Repo, Anna-Kaisa; Pyrhönen, Juha

doi:10.1109/tie.2016.2547368

Cited by 31 publications

(12 citation statements)

References 29 publications

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“…However, the PM division reduces production rates and increases prices. There are also many studies on the reduction of the eddy current loss of a PM through shape design of the rotor and the PM [19][20][21]. In most studies, the eddy current loss of the PM was directly calculated using 3-D FEA or an analytical method.…”

Section: Of 15mentioning

confidence: 99%

“…Figure 3 shows the shape of a rotor core that was designed to reduce the PM's eddy current loss. The V-shape of the rotor core between poles helps with reducing the eddy current loss in the PM [20]. Full factorial design (FFD) [24][25][26], a statistical method, was used to find the relation between eddy current loss and square of the flux variation in the PM.…”

Section: Verification Of Relationship Between Flux Variation and Eddymentioning

confidence: 99%

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Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

et al. 2020

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We designed and analyzed an interior permanent magnet synchronous motor (IPMSM) to prevent irreversible demagnetization of the permanent magnets (PMs). Irreversible demagnetization of NdFeB PMs mainly occurs due to high temperature, which should thus be minimized. Therefore, it is necessary to reduce the eddy current loss in the PM through optimal design. The shape of the rotor core was optimized using finite element analysis (FEA) and response surface methodology. Three-dimensional (3-D) FEA is required for accurate computation of the eddy current loss, but there is huge time, effort, and cost consumption. Therefore, a method is proposed for indirectly calculating the eddy current loss of PMs using 2-D FEA. A thermal equivalent circuit analysis was used to calculate the PM temperature of the optimized model. For the thermal analysis, the copper loss, core loss, and eddy current loss in PMs were estimated and applied as a heat source. Based on the results, we confirmed the stability of the optimum model in terms of the PM demagnetization.

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Section: Of 15mentioning

confidence: 99%

Section: Verification Of Relationship Between Flux Variation and Eddymentioning

confidence: 99%

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

et al. 2020

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“…A tooth-coil open-slot axial-flux machine was designed in [148], to reduce PMs eddy-current losses. It was demonstrated via the prototype that steel laminations on top of the PMs allowed the PM flux linkage maximization and eddy-current loss minimization.…”

Section: Rotor Shapementioning

confidence: 99%

Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

Ouamara

Dubas

2019

MCA

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Eddy-current analysis is an important research field. This phenomenon occurs in multiple areas and has several applications: electromagnetic braking, repulsive effects, levitation, etc. Thereby, this paper is limited to eddy-current study in rotating electrical machines. In the design process, if the permanent-magnet (PM) loss calculation is very important, the overheating due to eddy-currents must be taken into account. The content of this paper includes sources, calculation methods, reduction techniques, and thermal analysis of PM eddy-current losses. This review aims to act as a guide for the reader to learn about the different aspects and points to consider in studying the eddy-current.

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“…This results in a high local temperature in the motor, which produces a hidden danger in the windings and PMs. Many scholars have designed an in-wheel motor to reduce electromagnetic losses and improve cooling performance [18]- [21]. The motor has different cooling modes depending on the operating fluid: liquid-cooled [22], [23], oil-cooled [24], [25], and air-cooled [26].…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

Zhang

Liang

et al. 2020

IEEE Access

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This paper presents a novel yokeless and segmented armature (YASA) axial-flux in-wheel motor with amorphous magnetic material (AMM) stator cores for a solar-powered electric vehicle. Although this new axial-flux in-wheel motor has many advantages such as high efficiency, shorter axial length, and high power density, its working condition is complicated. In-wheel motors are usually operated in electromagnetic, thermal, and other multiphysics environments. Increasing the performance requirements of in-wheel motors, such as power density, efficiency, and reliability, requires a multiphysics design approach. The focus of this paper is on the analysis of electromagnetic characteristics, losses, temperature distribution, mechanical behavior and other characteristics of the axial-flux in-wheel motor. The back electromotive force (EMF) and electromagnetic torque of the motor with harmonic current are obtained by the 3-D finite element method (FEM). The permanent magnet (PM) eddy-current losses when using different PM shapes are studied. The equivalent thermal model of the tape-wound AMM stator segments and the windings are established, and the temperature distribution of the motor is obtained. The mechanical behavior of the stator segments and the rotor disks when the motor is eccentric and axially offset is analyzed, and the structural strength of the motor is evaluated. Finally, a prototype of the motor is fabricated, and the electromagnetic performance and temperature of the motor are tested to verify the accuracy of the multiphysics design approach.

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Rotor Eddy Current Losses Reduction in an Axial Flux Permanent Magnet Machine

Cited by 31 publications

References 29 publications

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Interior Permanent Magnet Synchronous Motor Design for Eddy Current Loss Reduction in Permanent Magnets to Prevent Irreversible Demagnetization

Permanent-Magnet Eddy-Current Losses: A Global Revision of Calculation and Analysis

Multiphysics Analysis of an Axial-Flux In-Wheel Motor With an Amorphous Alloy Stator

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