A Practical Approach for Estimating Bundle-Level Proximity Losses in AC Machines

Artetxe, Gurutz; Prieto, Borja; Caballero, Damian; Elósegui, Ibon; Maza, Gabriel Martinez

doi:10.1109/tie.2021.3130348

Cited by 6 publications

(9 citation statements)

References 28 publications

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“…Moreover, the additive manufacturing process can also achieve high fill factors, while controlling absolutely the shape and position of the conductors in the slot and the endspaces [137] (FIGURE 12). Hence, minimum end-windings can be achieved and the geometry of the conductor can be optimised to reduce AC losses [138] in high frequency applications (e.g. by reducing the height of the conductors in the slot closer to the stator bore, rounding the edges closer to the teeth, inserting voids in the conductors, leaving solid conductor sections in the end-windings where AC effects are weaker for improved overall resistance, etc.…”

Section: B Winding Technologies and Insulating Systemsmentioning

confidence: 99%

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

et al. 2022

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This paper presents a review of the state of the art in electric propulsion for regional aircraft in the MW range. The implications surrounding the implementation of this technology, such as the need of high-power density or the use of high-voltage at high-altitude, are presented. Along with the challenges, the available technologies to face them are reviewed. Those are, as follows, the emerging new motor topologies for this purpose, the winding technologies, the materials employed for electric motors for aircraft propulsion and the ground-breaking use of high-temperature superconductors (HTS) as a high-power density enabler. Finally, a conclusion is presented gathering the main ideas of the paper.INDEX TERMS Aircraft propulsion, electric motor, high-power, high-temperature superconductor, high-voltage.

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Section: B Winding Technologies and Insulating Systemsmentioning

confidence: 99%

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

et al. 2022

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“…Based on existing research work in academia, circulating current issue can be investigated based on finite element method (FEM) [4] [7][8][9][10][11], analytical methods [12][13][14][15][16], and the semi-analytical methods [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the disadvantage of long calculation time of FEM, analytical methods [12][13][14][15][16] have been proposed to evaluate AC copper loss. The analytical method obtains the slot leakage field by directly solving the Maxwell's equations in the slot, and ultimately derives the circulating current in the strands through the analytical circuit model [12][13][14] or directly calculates the AC losses based on the Poynting's theorem [15] [16].…”

Section: Introductionmentioning

confidence: 99%

A Computationally Efficient Semi-Analytical Method for Circulating Current Loss of High Speed Permanent Magnet Machines

Li,

Fan,

Liu

et al. 2024

IEEE Trans. Energy Convers.

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This paper proposes a computationally efficient (CE) semi-analytical method for winding power loss calculation of high speed permanent magnet machines induced by circulating current. It combines a CE magnetostatic finite element method (FEM) for rapid slot leakage field extraction and an analytical circuit model for circulating current calculation. Time-space transformation based CE FEM is applied for efficient slot leakage field extraction considering the polyphase windings.Besides, a conductor model with an automatic and practical turn splitting strategy is proposed to consider the effect of conductor positions and bundle shapes on the circulating current loss. The results on circulating current waveforms and corresponding losses show that the proposed method has high accuracy and can significantly reduce the simulation time, with an error less than 2% and the simulation time only 1/400 for the studied machine compared with the commercial FEM. Using the proposed method, the influence of some factors, including the turn number, the transposition effect and the bundle shape on the circulating current loss are investigated. Finally, the proposed method is further verified by experimental measurements implemented on two stator specimens.

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“…In order to avoid winding failures, the effect of the eddy current must be inspected, particularly in high-frequency domains. In the literature, different methodologies have been used to estimate the AC winding losses, including analytical [6][7][8], FEM [9][10][11], and hybrid approaches [12][13][14]. The analytical approaches are fast, although the accuracy is not high owing to the approximations in the models.…”

Section: Introductionmentioning

confidence: 99%

Mitigation of High-Frequency Eddy Current Losses in Hairpin Winding Machines

2022

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In high-speed and high-frequency electric machines, one of the major issues that impacts the performance and capability of a machine is the high-frequency eddy current losses in the windings. This work deals with AC winding losses in flat rectangular conductors. Aiming for eddy current loss mitigation, two different materials are investigated and compared for the same winding design, namely copper and aluminum. Using the finite element method (FEM), the conductor loss and current density behavior are simulated at the strand level. Further, in order to verify the simulated losses, the AC losses are measured and compared over a wide range of frequencies. Finally, recommendations are provided based on the obtained measurements to identify the best winding topology that is most suitable for automotive applications.

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A Practical Approach for Estimating Bundle-Level Proximity Losses in AC Machines

Cited by 6 publications

References 28 publications

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

Review of High Power and High Voltage Electric Motors for Single-Aisle Regional Aircraft

A Computationally Efficient Semi-Analytical Method for Circulating Current Loss of High Speed Permanent Magnet Machines

Mitigation of High-Frequency Eddy Current Losses in Hairpin Winding Machines

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