Improved core loss calculation method considering the non‐uniform distribution of magnetic flux density in powder cores

Abstract

Utilising powder cores in many power electronics applications have gained much attention due to the attractive magnetic properties of powder core materials. However, the magnetic flux density distribution is non-uniform along the core because the flux is dependent on the core geometry and due to the low relative permeability of the powder core material. The non-uniformity of the magnetic flux density distribution may cause huge calculation errors of core losses. Understanding the effect of the magnetic flux non-uniformity in the powder cores allows the circuit designer to accurately estimate the core losses in powder cores. This work addresses the negative effect of the inherent non-uniform magnetic flux density distribution on the core loss. Furthermore, an equivalent circuit to consider the non-uniform of the magnetic flux density distribution is proposed. The proposed circuit enables the core loss to be estimated more precisely. A reduction of 12% in the core loss measurement error has been reported while utilising the proposed circuit compared to traditional equivalent circuits. Along with the theoretical discussion, finite element method simulation and experimental results are also presented to evaluate the proposed core loss calculation method.

Advanced Ferromagnetic Materials in Power Electronic Converters: A State of the Art

“…On the other hand, powder cores are materials that have versatile magnetic characteristics and those are excellent candidates for replacing materials such as ferrite and steel sheets in electric machines applications [109]. The most recent advances in this type of material are presented in [118]- [121]. The powder cores can be found in alternators, transformers, generators, low-frequency filters, induced field coils, electrical components of the aircraft engine, and in DC engines, among others [109].…”

Análise Comparativa Entre Modelos Analíticos De Cálculo De Perdas No Núcleo Aplicados A Indutores Com Premagnetização Utilizando O Material High Flux

“…Para obtenção das perdas no núcleo magnético, o método de medição elétrica é empregado, em função da simplicidade e precisão, este método é largamente utilizado [10] - [20], [23] e [24]. Utilizando a mesma estratégia de [18], conforme ilustrado pela Figura 2, o primário do núcleo sob teste (NST) é utilizado para excitação CA e CC, estando inserido em um conversor Boost.…”

Test setup using DC metering approach for loss measurements of inductive components – principle, characterization, validation and application

“…In the 80s [3] and 90s [4] this approach was used, and also one decade later [5] it was studied. Recent publications [6,7] show that core loss measurement is still a crucial topic. Winding one acts as the excitation winding and delivers the magnetic field strength.…”