Estimation of Equivalent Thermal Conductivity for Electrical Windings with High Conductor Fill Factor

Ayat, Sabrina; Liu, Haipeng; Kulan, Mehmet C.; Wróbel, Rafał

doi:10.1109/ecce.2018.8557534

Cited by 21 publications

(20 citation statements)

References 15 publications

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“…Abovementioned technologies hardly achieve filling factors of 70-85%, even with rectangular or hexagonal conductors, especially in the case of distributed windings. In order to reach higher fill factors, profiled conductors (FIGURE 10 [131]) can be implemented, such as the form-wound and hairpin windings [132], [133], [134], [135]. One of the technologies under development that increases the slot fill factor (theoretically as high as 90%) and reduces the end windings is the utilisation of linear, flyer or needle winding techniques as the one shown in FIGURE 11 [136].…”

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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“…The homogenous model of the slot is created; the slot area is replaced by the concentric circles respecting the area of (copper and wire insulation of all conductors in the stator slot plus Kapton tape added in the slot) and the surrounding air [15,27] (see Figure 11). The number of conductors and their area of the cross-section is then represented by circles.…”

Section: Thermal Analysis Of Steady-state Non-rotating Machinementioning

confidence: 99%

“…The most complicated situation appears in the round-wired coils with random placement of the conductors in the slot area. The equivalent thermal parameters (thermal conductivity [14,15] heat transfer coefficients [16,17]) are often historically defined as empirical values based on the comparison of the calculation and measurement. The same methodology is also used in [18,19].…”

Section: Introductionmentioning

confidence: 99%

Challenges in Winding Design and Thermal Calculations: Physical Model of Permanent Magnet Synchronous Machine

2021

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Interest in multilayer windings is increasing with the application of the hairpin winding technology to the manufacturing of electrical machines. Therefore, the four-layer fractional slot concentrated winding is used for the initial design of the machine in this paper. The proposed physical model of the machine uses winding with a relatively high number of turns which is inappropriate to hairpin winding. Therefore the round-wire winding is created and the three-layer winding is derived and analyzed including the effect on the slot leakage inductance. The thermal analysis is then applied to the physical model of the machine to evaluate the slot-related thermal properties of the slot and the whole machine. The measurement is compared with the finite element analysis (FEA) and the equivalent slot thermal conductivity and heat transfer coefficients of the stator and rotor are obtained.

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“…S. Patankar provided a detailed relationship between the thermal conductivity of electrical materials and their body temperature [20]. In recent years, the variation of thermal coefficients has attracted considerable attentions [21]- [23]. Specifically, S. Ayat et al analyzed the influence of the slot insulation materials on the temperature distribution of electrical machine [21].…”

Section: Thermal Resistance Between Winding and Tooth R T-cp Thermal mentioning

confidence: 99%

“…In recent years, the variation of thermal coefficients has attracted considerable attentions [21]- [23]. Specifically, S. Ayat et al analyzed the influence of the slot insulation materials on the temperature distribution of electrical machine [21]. J. E. Cousineau et al investigated the role of air thermal conductivity of the electric machine stator-to-cooling jacket in thermal analysis [22].…”

Section: Thermal Resistance Between Winding and Tooth R T-cp Thermal mentioning

confidence: 99%

Improving Thermal Analysis Accuracy of LPTN for Vehicle Claw-Pole Alternator by Calibrating Forced Convection Coefficients Based on Experimental Results

Zhang

2019

IEEE Access

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Claw-pole alternators are particularly important for vehicle power generation due to their low cost, simple design, and mechanical robustness. High and low temperatures around vehicle claw-pole alternators (VCPAs) change their internal temperature distributions, thus thermal analysis is required for designing VCPAs. Aiming at improving the accuracy of evaluating the temperature of VCPAs, a novel lumped parameter thermal network (LPTN) is proposed to analyze the steady-state temperature of a double excitation VCPA under various ambient temperatures. The forced convection coefficients are calibrated in order that the LPTN can simulate the real heat transfer of the VCPA. The nonlinear least square method is applied to obtain the calibrated coefficients within a range of the tested ambient temperatures. Moreover, the effectiveness of the proposed method is verified via simulation studies, whereby the results show that the proposed LPTN with calibrated convection coefficients can accurately evaluate the temperature of VCPAs. Finally, these results soundly supply the technical knowledge for the thermal analysis and facilitate selecting the optimal scheme for machine designers.

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Estimation of Equivalent Thermal Conductivity for Electrical Windings with High Conductor Fill Factor

Cited by 21 publications

References 15 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

Challenges in Winding Design and Thermal Calculations: Physical Model of Permanent Magnet Synchronous Machine

Improving Thermal Analysis Accuracy of LPTN for Vehicle Claw-Pole Alternator by Calibrating Forced Convection Coefficients Based on Experimental Results

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