Electromagnetic Mass and Efficiency of Magnetic Gears for Electrified Aircraft

Tallerico, Thomas; Scheidler, Justin J.; Cameron, Zachary

doi:10.2514/6.2019-4475

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…The usual practices to reduce eddy current are by dividing each magnet piece into smaller segment or to introducing lamination to increase insulation on the magnet surface [23], [24]. The eddy current can also be calculated as (8) [10], [25],…”

Section: Resultsmentioning

confidence: 99%

“…Several studies were published concerning the torque density in magnetic gear through magnetization pattern and direction of rare earth permanent magnet [6]- [8]. However, the inclusion of high energy density permanent magnet in the structure would result in a high loss in eddy current [9], [10]. Furthermore, many CMG study only focus on the low-speed application which were less than 5,000 rpm.…”

Section: Introductionmentioning

confidence: 99%

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Preliminary analysis of eddy current and iron loss in magnetic gear in electric vehicle

Halim

Sulaiman

Jenal

et al. 2022

IJECE

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The inclusion of a high energy density permanent magnet into magnetic gear improves the machine's torque density. However, it also contributes to eddy current loss, especially in a high-speed application such in electric vehicle. In this paper, the losses from eddy current and iron loss are investigated on concentric magnetic gear (CMG). Torque multiplier CMG is designed with 8/3 gear ratio for this study. Iron loss and eddy current loss are compared and discussed. Based on this study, eddy current loss contributes to almost 96% of the total loss. This finding is hoped to direct the researcher to focus more on reducing loss associated with eddy current loss.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preliminary analysis of eddy current and iron loss in magnetic gear in electric vehicle

Halim

Sulaiman

Jenal

et al. 2022

IJECE

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“…Based on this principle, several MG designs were developed and successfully commercialized. Even though CMG has become very well known to designers, researches are mainly focused on torque multiplier type, where gear ratio is set at > 1 [12][13][14][15][16][17][18][19]. Noticeably, there are limited publications that discuss the topic of speed multiplier where the gear ratio is set at < 1 [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

A New Speed Multiplier Coaxial Magnetic Gear

Halim¹,

Sulaiman²,

Firdaus³

et al. 2020

PIER M

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Due to certain conditions, electrical motor (EM) that operates at high speed may lead to magnetic saturation, thermal issue, and stress to rotor structure. Magnetic gear (MG) designed for speed multiplier enables the prime mover from EM to operate at lower speed while the output gear multiplies the speed by its designated gear ratio at reduced torque. In this paper, a new coaxial magnetic gear is designed for speed multiplier. The role between inner yoke with PM and pole piece is switched. The inner part of magnetic gear is made to be stationary while the pole piece becomes inner rotor. The working principle is presented analytically based on flux modulation techniques for torque and speed transmission. Torque characteristic and gear efficiency are analysed using finite element and compared with existing speed multiplier magnetic gear with the same gear ratio of 7/3. Based on the simulation result, the proposed speed multiplier MG offers 16% better torque density and 12% higher gear efficiency at higher speed range. The structure of the inner rotor is also found to be more robust as only pole piece ring together with plastic holding frame is rotated instead of yoke with PM.

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