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In power powertrain, DC–DC converters, the selection of suitable magnetic core materials is a critical design consideration. It ensures weight and volume reduction and performance enhancement of such types of converters. This study provides a comprehensive comparison of magnetic core materials and a simplified cobweb chart that aids in the initial...
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... The detailed characterisation reveals the need for a suitable strategy that determines the suitable levels of auxiliary winding current to exploit the prominent merits of the current-controlled device. Consideration of its design in a real driving cycle is addressed in [15], and the selection of suitable magnetic core materials based on the weighted property method is dealt with in [16]. Furthermore, a simple strategy based on a heuristic approach that relates the currents between the two windings of the magnetic device is presented in [8]. ...
This paper provides the performance enhancement of powertrain DC-DC converter using a current controlled magnetic device, the variable inductor (VI). The VI is composed of two group of windings, the main winding and auxiliary winding. The auxiliary winding is used to regulate the permeability of the magnetic core over a wide range of load variations. To regulate the saturation level of the magnetic core and avoid the post-saturation operation of the power inductor, an appropriate level of auxiliary winding current is needed. To this end, a simple and dynamic strategy is proposed to estimate the auxiliary winding currents of VI. The proposed approach is validated using simulation studies of a large-scale VI-based powertrain DC-DC converter. The results reveal the significance of the proposed approach in the continuous regulation of the magnetic property of the power inductor core contributing to the performance enhancement of the powertrain DC-DC converter up to 13.70% and reducing the stress on switching devices by 17.87%. Furthermore, the energy source current variation is reduced by 6.73% leading to the reduction of stress on the energy storage systems.
Induction motors are widely used in our daily life and industrial machines. Single-phase induction motors with small power, manufactured with few horsepowers (HP), are preferred as compressor motors for household refrigerators and air conditioners. This inevitably leads to the lower energy consumption of compressor systems and requirements for a more compact design. In this study, a single-phase induction motor manufactured with classical core material for a certain power value is modeled using finite element analysis (FEA) software and the power losses are investigated. Later, this electric motor is designed with 6.5% SiFe jfe super core material, one of the soft magnetic core materials, for the same power value and comparative performance studies are performed. In these comparisons, mechanical volume and weight for the motor dimensions, electrical power losses and electromagnetic parameters are studied. It is therefore recommended that the jfe super core material, which has become popular in recent years, be used for the manufacture of single-phase induction motors, which are often used in household appliances.
Nacre‐mimetics hold great promise as integration of structure and function. Various techniques have been proposed to prepare nacre‐inspired materials, but in most cases, organic materials are usually used that decrease high‐temperature stability. Factually, efficient synthesis of nacre‐like high‐performance soft magnetic composites (SMCs) with good thermal stability is still challenging. Herein, a novel and simple strategy is reported on designing nacre‐like SMCs by cold sintering of ferrite‐coated alloy flakes with the absence of polymers. By selecting NH4HCO3 aqueous solution as transport solvent, a highly ordered nacre‐like structure and enhanced densification with large electrical resistivities and strong interfacial bonding are successfully achieved, which are superior to the cold‐sintered composites using water as transport solvent as well as the hot‐pressed composites based on alloy flakes and epoxy resin. The resultant composites illustrate large density (≈6.286 g cm⁻³) and electrical resistivity (≈3.9 × 10⁵ Ω cm), allowing remarkable flexural strength (≈46.5 MPa), high permeability (μ′ = ≈107.3 at f = 10 MHz), together with low tanδ μ (≈0.09 at f = 10 MHz) and P cv (≈183.6 kW m⁻³ at 50 mT/100 kHz), which show great potential in high‐frequency power electronic and electrical systems. The synthesis strategy sheds light on designing other nacre‐like materials or developing new metal−ceramic composites.
