Alternating-Current Copper Loss Reduction in a High-Frequency Transformer for Railways Using a Magnetic Tape

Shimura, Kazuhiro; Kubota, Kazuo; Sato, Masaru; Mizuno, T.; Sakurada, Masayuki; Nebashi, Takao; Koike, N.

doi:10.1109/tmag.2021.3113498

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…To prevent eddy currents and thus reduce iron loss in the magnetic composite material, the magnetic powder is dispersed and blended in the resin. This characteristic is effective in reducing iron loss in ultra-high-speed rotary motors of 100,000 rpm and high-frequency transformers of over 10 kHz [42], [45], [46]. Magnetic composite materials have lower magnetic permeability and saturation magnetic flux density than electrical steel sheets and other magnetic materials, as shown in Fig.…”

Section: B Magnetic Composite Materials Characteristicsmentioning

confidence: 99%

“…However, the saturation magnetic flux density and magnetic permeability can be easily adjusted by simply changing the material and compounding ratio of the magnetic composite material. Furthermore, no pressurizing process, such as a dust core, is required for manufacturing, allowing for the low-cost formation of a flexible structure (bulk or sheet) [38]- [40], [45].…”

Section: B Magnetic Composite Materials Characteristicsmentioning

confidence: 99%

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Expansion of Motor High-Efficiency Area by Inserting Magnetic Composite Material into Rotor

et al. 2023

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Variable magnetic flux motors have been proposed to achieve high-efficiency operation over a wide drive range ranging from high torque to high-speed. This paper clarifies the high efficiency area expansion effect of a variable flux motor with a magnetic composite material inserted in the rotor. To achieve the effect of enlarging the maximum efficiency range, this motor uses magnetic composite materials with much lower saturation magnetic flux density and iron loss than electromagnetic steel plate. This paper reports the magnetic and mechanical properties of the magnetic composite material using Fe-Si-Al alloy, considering low iron loss. The simulation results clarified the variable magnetic flux characteristics for reducing loss at high-speed rotation by actively utilizing the magnetic saturation region of the magnetic composite material. The efficiency improvement in the high-speed region is attributed to the suppression of spatial harmonics without significantly reducing the q-axis inductance. Furthermore, the proposed motor achieves both the expansion of the high-efficiency range and relaxation of mechanical stress by increasing the thickness of the bridge part adjacent to the permanent magnet.

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Section: B Magnetic Composite Materials Characteristicsmentioning

confidence: 99%

Section: B Magnetic Composite Materials Characteristicsmentioning

confidence: 99%

Expansion of Motor High-Efficiency Area by Inserting Magnetic Composite Material into Rotor

et al. 2023

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“…Without the secondary storage devices, it is not possible to avoid data loss when encountering power-off, owing to the volatility of the primary storage. In spite of its importance, the secondary storage markets today are still dominated by the conventional magnetic storage memory (hard disk drive (HDD) and magnetic tape) [16,17] and recently popular solid-state drive (SSD) [18]. However, HDD and magnetic tape are inevitably subjected to the well-known superparamagnetic limits, thus restricting the enhancement of the storage capacity of these magnetic storage memories [19].…”

Section: Introductionmentioning

confidence: 99%

Design of plasmonic enhanced all-optical phase-change memory for secondary storage applications

Lian

Liu²,

Fu³

et al. 2022

Nanotechnology

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Phase-change optical device has recently gained tremendous interest due to its ultra-fast transmitting speed, multiplexing and large bandwidth. However, majority of phase-change optical devices are only devoted to on-chip components such as optical tensor core and optical main memory, while developing a secondary storage memory in an optical manner is rarely reported. To address this issue, we propose a novel phase-change optical memory based on plasmonic resonance effects for secondary storage applications. Such design makes use of the plasmonic dimer nanoantenna to generate plasmonic resonance inside the chalcogenide alloy, and thus enables the performance improvements in terms of energy consumption and switching speed. It is found that choosing height, radius, and separation of the plasmonic nanoantenna as 10 nm, 150 nm, and 10 nm, respectively, allows for a write/erase energies of 100 pJ and 240 pJ and a write/erase speed of 10 ns for crystallization and amorphization processes, respectively. Such performance merits encouragingly prevail conventional secondary storage memories and thus pave a route towards the advent of all-optical computer in near future.

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Design, manufacturing, and testing of 0.35/25 kV, 20 kHz transformers for particle accelerators

Chakraborty

Christian

Amal

et al. 2023

Review of Scientific Instruments

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A high voltage, high frequency transformer unit has been designed and built for powering the Cockcroft–Walton voltage multiplier to be used as part of a particle accelerator power supply at the Institute For Plasma Research, India, for the nuclear fusion research facility. A novel combination of high voltage (25 kV), high frequency (20 kHz), and high power (70 kV A) specifications makes its design distinctive and more challenging. The complete unit is composed of two 0.350/25 kV amorphous core transformers connected in center-tap configuration and immersed in an oil-filled tank. To facilitate an iterative design procedure, a spreadsheet method was utilized. The design involved a methodical approach for the core and winding selection, followed by the magnetic analysis and high voltage insulation layout through the finite element method. All the magnetic, electrical, and thermal parameters have been evaluated in detail, assuring a continuous stable operation having an efficiency of greater than 95%. Finally, the transformers were made, and preliminary experiments, including turns ratio, short-circuit, and dielectric tests, were carried out to verify the accuracy of the proposed design. The unit was also field tested under actual load conditions, and the test results were presented and corroborated with the design calculations.

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Alternating-Current Copper Loss Reduction in a High-Frequency Transformer for Railways Using a Magnetic Tape

Cited by 8 publications

References 28 publications

Expansion of Motor High-Efficiency Area by Inserting Magnetic Composite Material into Rotor

Expansion of Motor High-Efficiency Area by Inserting Magnetic Composite Material into Rotor

Design of plasmonic enhanced all-optical phase-change memory for secondary storage applications

Design, manufacturing, and testing of 0.35/25 kV, 20 kHz transformers for particle accelerators

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