Novel Method for the Determination of Eddy Current Losses in the Permanent Magnets of a High-Speed Synchronous Machine

Narjes, Gerrit; Ponick, Bernd

doi:10.1109/icelmach.2018.8506813

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…In [56], the harmonics caused by the PWM were incorporated into a series of steps to calculate the stator MMF. The eddy-current losses caused by the fundamental time harmonic of the winding have been calculated [57].…”

Section: Supply and Controlmentioning

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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Section: Supply and Controlmentioning

confidence: 99%

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

Ouamara

Dubas

2019

MCA

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“…In PM machines, the rotor losses are caused by a permeance variation of the airgap due to the slotting of the stator. When pulse width modulation (PWM) inverters are used for the excitation of PM machines, eddy current losses are produced by the switching harmonics of the PWM inverter [7], [8]. Hence, it is essential to diminish the spatial and time harmonics of the machine.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Novel High Speed Permanent Magnet Machine Considering Magnet Eddy Current Loss

Khan

Ahmad

et al. 2020

IEEE Access

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In high speed permanent magnet (HSPM) machines, the computation of magnet eddy current loss is essential as these losses significantly affect the temperature of the permanent magnet (PM) and electromagnetic performance and can result in irreversible demagnetization of the PM. Several techniques have been adopted to minimize the eddy current loss of the PM; however, superior performance has not been achieved yet. In this paper, the design characteristics of the HSPM machine are analyzed. The PM is covered by a titanium sleeve to retain the PM on the rotor and to further reduce the eddy current loss of the magnet. The undesirable harmonics of the airgap flux density are minimized, which reduces the eddy current loss in the solid PM and rotor. Two existing models, with and without auxiliary slots, are examined and compared with the proposed design having a titanium-based retaining sleeve. The analysis reveals that the eddy-current loss, cogging torque, and iron losses of the PM are reduced by 82%, 73%, and 44.7%, respectively, in the proposed model; however, a marginal increase is observed in the average rated torque profile and open circuit flux linkage.INDEX TERMS Auxiliary slot, eddy current losses, finite element analysis, high speed machine, iron loss, permanent magnet, sleeve, spatial harmonics.

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Methodology to Evaluate the Mechanical Stress in High Speed Electric Machines with Buried Magnets

Gerlach

Zajonc

Ponick

2020

2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

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Novel Method for the Determination of Eddy Current Losses in the Permanent Magnets of a High-Speed Synchronous Machine

Cited by 5 publications

References 16 publications

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

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

Analysis and Design of Novel High Speed Permanent Magnet Machine Considering Magnet Eddy Current Loss

Methodology to Evaluate the Mechanical Stress in High Speed Electric Machines with Buried Magnets

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