Cogging torque analysis in permanent magnet synchronous generators using finite elements analysis

Dalcalı, Adem

doi:10.1002/2050-7038.12588

Cited by 5 publications

(6 citation statements)

References 49 publications

(83 reference statements)

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“…Therefore, the flux density in the stator teeth and yoke will be affected and the performance of the generator will change. 44 Embrace is the pole arc/pole pitch ratio which determines the distance between magnets and is given in Figure 1. Increasing the embrace value decreases the distance between them.…”

Section: Embrace and Offsetmentioning

confidence: 99%

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Optimum design of slot and magnet structure of permanent magnet synchronous generator with teaching‐learning‐studying‐based optimization

Duman,

Dalcalı

2023

Int J Numerical Modelling

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From the point of production to consumption, electrical energy should be utilized effectively and qualitatively. Efficiency at the electricity consumption stage is not sufficient, and the desired criteria must be met at the production stage. The efficient and high‐quality generation of electrical energy is directly related to the performance of the generator used. In order to achieve the desired criteria for a generator design, many issues should be considered together. In order for this study to do, a 14‐pole and 5 kW permanent magnet synchronous generator (PMSG) was designed using the innovative optimizer named the weighted mean of vectors (INFO), the jumping spider optimization algorithm (JSOA), the teaching–learning‐based optimization (TLBO), the pelican optimization algorithm (POA) and the teaching‐learning‐studying‐based optimization (TLSBO) algorithms. The generator performance was optimized within the determined inequality constraints by the offset and embrace value and six parameters of the stator slot structure. The generator designed with the parameters determined by the TLSBO was more successful than the generators designed according to all the other proposed algorithms. The total harmonic distortion (THD) value decreased by 51.983% compared to the initial design at approximately the same efficiency.

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Section: Embrace and Offsetmentioning

confidence: 99%

“…With the increase of the offset value, the flatness of the edges of the magnet will increase, and thus the amount of air gap will increase. Therefore, the flux density in the stator teeth and yoke will be affected and the performance of the generator will change 44 …”

Section: Permanent Magnet Synchronous Generatormentioning

confidence: 99%

Optimum design of slot and magnet structure of permanent magnet synchronous generator with teaching‐learning‐studying‐based optimization

Duman,

Dalcalı

2023

Int J Numerical Modelling

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“…Another important concept is the cogging torque, which defines the resistance of the PM against the separation from core tips. It varies with the square of air gap magnet flux magnitude as given by References 1, 8, 23, and 29.

T_{cog} ((), θ) = - \frac{\partial W_{g} ((), θ)}{\partial θ},

T_{cog} ((), θ) = - \frac{1}{2} ϕ_{g}^{2} \frac{dR}{dθ} .

…”

Section: Algebraic Formulation Of Generatormentioning

confidence: 99%

Optimization of a 3‐kWaxial flux permanent magnet generator with variable air gap

Kurt

Gör

Çelik

2021

Int Trans Electr Energ Syst

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Summary An air gap optimization study of a 3‐kW axial flux three‐phase permanent magnet generator has been performed. The machine has two rotors sandwiching a stator with 12 separated laminated cores under an innovative flux morphology circulating over the back‐iron components. The rotor component has 16 rare earth magnets with an innovative self‐cooling blade structure. According to the air gap parametric magnetostatic analyses under the finite element method (FEM) between the range of 0.8 and 7 mm, the spatial magnetic flux distribution and cogging torque values have been determined. Besides, following the magnetostatic analyses, time‐dependent FEM simulations over the generated voltage and power values have been studied in detail. Then, after the implementation of the designed machine, the experiments have been performed for various air gap values. The generated power is observed to be dependent on the air gap, the efficiency is measured as 85%, and power density is measured as 111.7 kW/m3, which is a promising value compared to the literature. A scaling effect study is performed as functions of air gap and rotor speed for the first time to our knowledge. The maximum cogging torque is measured as 3.12 Nm. The other superiority of the present prototype is its low total harmonic distortion value within 2%; thereby, it generates nearly an ideal sinusoidal waveform. Consequently, the novel machine is recommended for both off‐grid and on‐grid operations with its low harmonic distortion and high efficiency.

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“…In this sense, in sizing, the experience of the designer has importance in terms of meeting expectations. The general equation that is used for sizing electric machinery [21,22]:…”

Section: Permanent Magnet Synchronous Generatormentioning

confidence: 99%

“…As known, a large part of the cost in PM machines is created by the magnets. In the cost calculations, it was accepted that, N40UH: 95 $/kg, M19: 1.9 $/kg and Copper: 6 $/kg [21]. The material amounts that were used in the designs and their costs are shown in Table III.…”

Section: Fig 2 Flux Density Distribution In Part Cross-sectionsmentioning

confidence: 99%

A Comparative Study of PM Synchronous Generator for Micro Hydropower Plants

Dalcalı¹

2021

Balkan Journal of Electrical and Computer Engineering

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Developing technology and growing population are increasing the need of countries for energy every passing day. Renewable energy resources, which are an environmentally friendly and local solution alternative to fossil fuels, are seen to be a significant source of supply in this matter. Among renewable energy resources, hydroelectric energy is in an advantageous position with its reliable potential and sustainable production. With the purpose of utilizing small flowing waters such as rivers and streams and solving problems of access to interconnected grids in rural areas, micro-type hydroelectric power plants have a significant potential for countries. This study carried out the design and performance analyses of permanent magnet synchronous generators (PMSGs) with different numbers of poles for micro hydroelectric power plants. The generators' flux density values and total voltage harmonic distortions were examined. Additionally, the cogging torque magnitudes have been analyzed. The generators were loaded with nominal loads, and the time-dependent waveforms of phase voltages were obtained. By subjecting the obtained voltages to Fourier analysis, their harmonic spectrum was created. Finally, by considering the amount of active material used for the designs, their costs were compared.Index Terms-Finite element analysis, Micro hydropower plant, Synchronous generator. I. INTRODUCTIONHE NEED for energy resources is increasing every day due to decreased fossil fuel resources, increased environmental concerns and population density. This has made energy supply one of the most important issues of today. Renewable energy resources (RER) are a significant solution for all these problems. The popularity of renewable energy is increasing as fossil fuels lead to environmental pollution and are being exhausted. In the period of 2000-2009, there were increases of 76% in oil prices, 114% in natural gas prices and 136% in coal prices. It is projected for the period of 2015-2040 that there will be increases of 186.3%, 85.7% and 56.3% in oil, natural gas, and coal prices, respectively. Considering the projections, it is important to increase renewable energy resources. Renewable energy is considered as inexpensive,

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Cogging torque analysis in permanent magnet synchronous generators using finite elements analysis

Cited by 5 publications

References 49 publications

Optimum design of slot and magnet structure of permanent magnet synchronous generator with teaching‐learning‐studying‐based optimization

Optimum design of slot and magnet structure of permanent magnet synchronous generator with teaching‐learning‐studying‐based optimization

Optimization of a 3‐kWaxial flux permanent magnet generator with variable air gap

A Comparative Study of PM Synchronous Generator for Micro Hydropower Plants

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