Design, modelling and optimisation of a slot‐less axial flux permanent magnet generator for direct‐drive wind turbine application

Ghaheri, Aghil; Ajamloo, Akbar Mohammadi; Torkaman, Hossein; Afjei, E.

doi:10.1049/iet-epa.2019.0385

Cited by 17 publications

(9 citation statements)

References 45 publications

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“…The studied RWAFPM generator specification is selected so that it could be installed in a direct‐drive horizontal axis wind turbine system. The horizontal axis wind turbines are widely used for small scale‐energy conversion units, which have advantages over their vertical axis counterparts in terms of higher efficiency and access to stronger wind due to their higher heights [20]. The obtainable wind power can be calculated using the equation below:

P_{w} = \frac{1}{2} ρ A V_{normalw}^{3} C_{normalp}

where

ρ

, A and

V_{w}

are the air density, the blades swept area, and the wind speed, respectively.…”

Section: Rwafpm Generator Designmentioning

confidence: 99%

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Gharehseyed

Vahedi

Nobahari

et al. 2020

IET Electric Power Applications

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Ring winding axial flux permanent magnet (PM) machine (RWAFPM) has recently been introduced, which is beneficial in terms of manufacturability and fault tolerability. This study aims to examine the use of RWAFPM for a small‐scale direct‐drive wind generator. The structural features of the RWAFPM make it subjected to remarkable cogging torque. Accordingly, the main efforts of this study are focused on finding a proper solution for its torque profile challenges. In this regard, extensive investigations are carried out on rotor design improvements. First, several schemes are analysed, separately, including pole skewing, pole arc ratio modifying, pole grouping and rotor disks shifting. Then an optimum combination of selected schemes is calculated by the Taguchi method and considering the mean torque value as well as the PM usage. It is demonstrated that significantly improved results could be achieved mainly through cost‐effective modified fabrication. The 3D finite element models are employed throughout the study along with some experimental measurements to verify the results.

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P_{w} = \frac{1}{2} ρ A V_{normalw}^{3} C_{normalp}

where

ρ

, A and

V_{w}

are the air density, the blades swept area, and the wind speed, respectively.…”

Section: Rwafpm Generator Designmentioning

confidence: 99%

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Gharehseyed

Vahedi

Nobahari

et al. 2020

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…The efficiency of the AFPMSG for wind power generation is high due to the absence of iron loss. The elimination of cogging torque leads to a small starting torque which will improve the efficiency of capturing wind energy [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

3‐D magnetic equivalent circuit model for a coreless axial flux permanent‐magnet synchronous generator

Zhang

Wang

Gao

2021

IET Electric Power Appl

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In coreless axial flux permanent magnet synchronous generators (AFPMSGs), magnetic leakage and fringing effect is significant due to the large air gap and increases the difficulty in magnetic field calculation. This paper presents a 3‐D magnetic equivalent circuit (MEC) model for the magnetic field calculation in coreless AFPMSGs by considering the magnetic leakage and fringing flux. Field distribution is calculated based on the magnetic circuit analysis. The magnetic flux in the air gap between the permanent magnets is analysed using the magnetic field division method. Compared with the traditional magnetic circuit model, the magnetic leakage from PM to the rotor iron plates is considered in both radial and tangential directions in the proposed model. The proposed MEC method is applied to a specific AFPMSG, and the magnetic field distribution, no‐load back electromotive force (EMF), and torque are calculated and compared with finite elements (FEM) results. AFPMSG machines with different pole‐arc ratios are prototyped to validate the effectiveness and accuracy of the proposed 3‐D MEC model. The results obtained by the proposed MEC model are in good agreement with those of the FEM and experimental results.

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“…The gearbox and transmission equipment in wind turbine systems reduce the efficiency of the wind generation system [1]. Furthermore, the gearing system reduces the reliability of the wind turbine and requires periodic maintenance [2,3]. The absence of transmission equipment is considered an advantage for the direct-drive wind turbines (DDWTs), however, some considerations need to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

Cogging Torque Minimization in Transverse Flux Permanent Magnet Generators using Two-step Axial Permanent Magnet Segmentation for Direct Drive Wind Turbine Application

Nasiri‐Zarandi

Ajamloo

Abbaszadeh

2021

IJE

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Transverse flux permanent magnet machines (TFPMs) are categorized as synchronous machines that benefit from having high value of torque density and capablity of accommodating high pole numbers. These characteristics make TFPMs suitable candidates for low-speed applications where high torque density value is requred such as direct drive wind turbine application. Despite the aforementioned advantages, TFPMs suffer from intrinsically high cogging torque value which is an important concern for wind turbine application. This paper focuses on axial PM segmentation technique to minimized cogging torque of TFPM topologies. Concept of the proposed method is discussed using analytical equations and optimum segmentaion angle is formulized. Non-linear magnetic equivalent circuit (MEC) is adopted where the PM segmentation, armature reaction, rotor transition and iron saturation effect are carefully modeled. The results of the MEC simulation are compared with the finite element method (FEM) results in terms of accuracy and computational time. The results from the analysis indicate that the proposed MEC method is almost ten times faster than FEM with reasonable level of precision. Taguchi method is adopted as a fast-response optimization method to improve the generator torque characteristics. The results show that the cogging torque has reduced by 97% with respect to the initial design while the average torque has only dropped by 8% which is an acceptable side effect due to the significant improvement in machine cogging torque.

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Design, modelling and optimisation of a slot‐less axial flux permanent magnet generator for direct‐drive wind turbine application

Cited by 17 publications

References 45 publications

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

Torque characteristics enhancement of ring winding axial flux permanent magnet generator for direct‐drive wind turbine

3‐D magnetic equivalent circuit model for a coreless axial flux permanent‐magnet synchronous generator

Cogging Torque Minimization in Transverse Flux Permanent Magnet Generators using Two-step Axial Permanent Magnet Segmentation for Direct Drive Wind Turbine Application

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