A Review of Permanent Magnet Models Used for Designing Electrical Machines

Mörée, Gustav; Sjölund, Jonathan; Leijon, Mats

doi:10.1109/tmag.2022.3200150

Cited by 10 publications

(4 citation statements)

References 198 publications

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“…The dependence of magnetization on temperature is non-linear, but approximate models exist [67]. The most common approach is to describe the temperature function with a linear model.…”

Section: Thermal Modeling Of Permanent Magnetsmentioning

confidence: 99%

“…In addition, the absence of copper from the rotor offers advantages of reduced maintenance and increased efficiency; on the other hand, in the case of modern reluctance motors (SRM), the presence of magnets improves the power factor and offers the potential for higher torque. A key area of extensive study concerns the level of magnetization of permanent magnets at specific temperatures [67,68].…”

Section: Demagnetization Modeling Of Permanent Magnetsmentioning

confidence: 99%

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Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

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The extreme environmental issues and the resulting need to save energy have turned attention to the electrification of energy applications. One of the key components involved in energy efficiency improvements is the appropriate conception and manufacturing of electric machines. This paper overviews the electromagnetic analysis governing the behavior of permanent magnets that enable substantial efficiency gains in recent electric machine developments. Particular emphasis is given to modeling the properties and losses developed in permanent magnets in emerging high speed applications. In addition, the investigation of properties and harmonic losses related to ferromagnetic materials constituting the machine magnetic circuits are equally analyzed and discussed. The experimental validation of the implemented methodologies and developed models with respect to the obtained precision is reported. The introduction of mixed numerical techniques based on the finite element method intended to appropriately represent the different physical phenomena encountered is outlined and discussed. Finally, fast and accurate simulation techniques including aggregated lumped parameter models considering harmonic losses associated with inverter supplies are discussed.

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“…The dependence of magnetization on temperature is non-linear, but approximate models exist [67]. The most common approach is to describe the temperature function with a linear model.…”

Section: Thermal Modeling Of Permanent Magnetsmentioning

confidence: 99%

Section: Demagnetization Modeling Of Permanent Magnetsmentioning

confidence: 99%

Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

View full text Add to dashboard Cite

show abstract

“…The recoil line, after permanent demagnetisation, is considered to be parallel to the line of original magnetisation [22], although such consideration is an approximation [23]. Additionally, laboratory work demonstrates that the antiparallel component of the external magnetic field is not the only component responsible for the demagnetisation [24], as is often assumed in FEM simulations, implying the need for more precise models to describe the angular dependency of H cj .…”

Section: Hard Magnetic Materials and Permanent Demagnetisationmentioning

confidence: 99%

On the relation between performance and permanent demagnetisation in spoke type machines with ferrite magnets

Silva,

Eriksson

2024

IET Electric Power Appl

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The use of rare earth elements (REE) in permanent magnets (PMs) raises problems in several domains. The supply chain of these is fragile, the prices have shown volatility and its manufacturing has a bigger impact on climate change when compared to the manufacturing of other PMs. Instead, ferrite PMs have been researched as an alternative. This alternative shows a relatively higher demagnetisation risk when compared to REE PMs. Thus, a detailed study on permanent demagnetisation during winding faults is crucial. The authors use the finite element method to evaluate different machine designs, developed under mechanical constraints, and explore several strategies to mitigate permanent demagnetisation. Also, the importance of avoiding permanent demagnetisation is changed gradually in the optimisation process. The results show that the protection of the PM and performance optimisation are irreconcilable goals. It also highlights the impact of the stator design in decreasing demagnetisation. Additionally, it is shown that the classic notion of avoiding demagnetisation is an ineffective strategy for designing high‐performance machines with ferrite magnets, and instead, it should be integrated into the optimisation process and weighted according to the application demands.

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“…Under normal working conditions, the permanent magnets are intended to be in the second quadrant of the BH curve. The permanent magnets such as neodymium-iron-boron (NdFeB) are usually modelled by a linear slope [20]. The linear model relies on a constant remanent flux density B r of the permanent magnets and a slope represented by the permeability of the magnet as…”

Section: A Modelling Of Permanent Magnetsmentioning

confidence: 99%

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

Sharukh,

kalita

2023

Preprint

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<p>Electrical machines with eccentrically positioned rotors experience strong unbalanced magnetic pull directed towards the narrowest air gap. This unbalanced force increases the rotor eccentricity and degrades machine performance. Accurate computation and reduction of electromagnetic force are required for controlling electromagnetic vibration, and this can be achieved by employing a bridge-configured winding scheme. This paper presents a two-dimensional bridge configured permanent magnet synchronous machine model to investigates the force compensating strategy under different eccentricity of PMSM. Furthermore, the force components under rotor eccentricity are compared with Bridge ON and Bridge OFF conditions. The connection of bridge points allows the different currents to flow in different coil groups, reducing the unbalanced magnetic pull. The modelling and simulation of PMSM have been done using time-stepping finite element method. The finding indicates that connecting the bridge points can significantly reduce the amplitude of the electromagnetic force components induced by different rotor eccentricities.</p>

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A Review of Permanent Magnet Models Used for Designing Electrical Machines

Cited by 10 publications

References 198 publications

Overview on Permanent Magnet Motor Trends and Developments

Overview on Permanent Magnet Motor Trends and Developments

On the relation between performance and permanent demagnetisation in spoke type machines with ferrite magnets

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

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