Improved Analytical Modeling of Axial Flux Machine With a Double-Sided Permanent Magnet Rotor and Slotless Stator Based on an Analytical Method

Sung, So-Young; Jeong, Jong Seob; Park, Yu-Seop; Choi, Jang-Young; Jang, Seok–Myeong

doi:10.1109/tmag.2012.2203112

Cited by 39 publications

(22 citation statements)

References 4 publications

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“…By taking into account AWT cruising speed, the volumetric flow rate is assumed here to have a value of 7 dm 3 /s (Table 3). Finally, the air temperature inside the air gap θ g and the stator temperature θ s can be acquired from (14) and (15), respectively…”

Section: Thermal Modelmentioning

confidence: 99%

Weight optimisation of coreless axial‐flux permanent magnet machines

Subotić

Gammeter

Tüysüz

et al. 2018

IET Electric Power Applications

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This study explores the upper limits in power-to-weight and torque-to-weight ratios of coreless axial-flux machines with permanent magnets. Moreover, it provides a comprehensive multifunctional optimisation procedure that is utilised for obtaining these limits. The procedure encompasses analytical analysis of electromagnetic , thermal and structural (mechanical) aspects of axial-flux machines. Obtaining global minima is ensured by considering the whole machine design space, and mapping it into the performance space, where a Pareto front can be easily identified. From it, an optimal motor/generator for airborne wind turbines is identified. The design has a power-to-weight ratio of 6.4 kW/kg (19 Nm/kg at 3200 rpm) including structural (purely mechanical) parts, at an efficiency of 95%. This is a significantly higher ratio than the one in modern commercial machines or designs reported in the literature. Therefore, the resulting machine is manufactured and experimentally tested in order to verify the claimed limits and the optimisation methodology.

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Section: Thermal Modelmentioning

confidence: 99%

Weight optimisation of coreless axial‐flux permanent magnet machines

Subotić

Gammeter

Tüysüz

et al. 2018

IET Electric Power Applications

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“…Furthermore, the laminated electrical steel sheets can only be used for 2D flux guidance. In comparison with the laminated electrical steel sheets, SMC materials can be pressed into any shape easily with almost no remnant and it suits 3D flux applications with anisotropy [10][11][12][13][14][15]. In this paper, stator shoes and stator bars are manufactured from SMC materials, and the main design parameters are shown in Table 1.…”

Section: Yokeless and Segmented Armature Axial Flux Motorsmentioning

confidence: 99%

Field-Weakening Performance Improvement of the Yokeless and Segmented Armature Axial Flux Motor for Electric Vehicles

Wang

et al. 2017

Energies

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Abstract:In order to avoid the unsafe operation and raise efficiency of yokeless and segmented armature axial flux motors at high speed, the control current of air gap flux is expected to be as small as possible with the same field-weakening effect. To reduce the control complexity, a new structure of module poles with a combination of permanent magnet and soft magnetic material is proposed, which has the characteristics of lower d-axis reluctance and a higher performance of yokeless and segmented armature axial flux motor with surface mounted permanent magnet. According to finite element analysis (FEA), the flux distributions of a rotor pole in no-load and demagnetization condition are contrasted, and under this new configuration, the derivative analytical models of back electromotive-force (EMF), electromagnetic torque, and air gap flux are validated, moreover, the influence of soft magnetic material of rotor poles on controlling the air gap flux is investigated in different load. Based on a particular objective function, the combination of permanent magnet and soft magnetic material is optimized. The results show that optimal solution of field-weakening performance of yokeless and segmented armature axial flux motors can be improved effectively and legitimately.

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“…However, a single‐sided axial magnet generator will results in excessive axial attraction [1]. A double‐sided permanent magnet rotor with a single stator [2, 3] can offset the axial attraction and increase the output power at the cost of an increased weight. The double‐sided permanent magnet rotor design can also reduce bearing wear and noise problem compared with a single‐sided structure, which thus increases the generator reliability.…”

Section: Introductionmentioning

confidence: 99%