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Magnetic Linked Power Converter for Transformer-Less Direct Grid Integration of Renewable Generation Systems
Published in Md. Rabiul Islam, Md. Rakibuzzaman Shah, Mohd Hasan Ali, Emerging Power Converters for Renewable Energy and Electric Vehicles, 2021
A. M. Mahfuz-Ur-Rahman, Md. Rabiul Islam, Kashem M. Muttaqi, Danny Sutanto
High-frequency magnetic linked power converters improve the power conversion efficiency as compared to the power frequency transformer-based power conversion systems. The magnetic link also provides galvanic isolation and can also generate multiple isolated balanced DC voltage sources. Compared with the conventional power frequency transformers, the high-frequency transformers have much smaller and lighter magnetic cores and windings, and thus much lower costs [9]. For fabrication of high-frequency transformers, the amorphous material has excellent magnetic characteristics, such as high saturation flux density and relatively low specific core losses at medium to high frequencies [10]. The commercially available amorphous material is Metglas (e.g., the Metglas alloys 2605S3A and 2605SA1), which is manufactured by Hitachi Metals. The saturation flux density of the Metglas alloy 2605S3A is 1.41 T and the specific core loss at 10 kHz sinusoidal excitation of 0.5 T is 20 W/kg [11].
Magnetic Materials
Published in David Jiles, Introduction to Magnetism and Magnetic Materials, 2015
Amorphous metals have been developed for use in electromagnetic devices [11]. These alloys, such as Metglas, have found applications in some smaller, lower-power devices, but have not been successful in replacing silicon-iron in transformers except in some cases where distribution transformers have been required in locations where fuel costs are high. Many of these Metglas transformers have been built and sold; however, that remains a very small fraction of the market for transformers. Large-scale adoption of these materials as transformer cores depends not so much on performance as cost, both for the materials themselves and the fabrication costs in producing the transformers. Also efforts have continued to improve the properties of silicon-iron [12].
Layered Two-Phase Magnetoelectric Materials
Published in Sam Zhang, Dongliang Zhao, Advances in Magnetic Materials, 2017
Zhaofu Du, Sam Zhang, Dongliang Zhao, Tat Joo Teo, Rajdeep Singh Rawat
Among the ME composites, Terfenol-D-based composites have shown the strongest ME coupling over a wide frequency range. However, it is expensive and gets easily oxidized. New material substitute for Terfenol-D should have some properties such as high piezomagnetic coefficient and relatively small demagnetization factor. Recently, using Metglas as the magnetic phase is widely studied as such a magnetic sensor is accurate and cheap. For the two-phase ME composites, the future directions include the following.
In-situ pitting corrosion detection using high-frequency T(0,1) guided wave mode in gas distribution tubes at operating temperatures
Published in Journal of Structural Integrity and Maintenance, 2021
Aditya Chilukuri, Nishanth Raja, Krishnan Balasubramaniam
The laboratory testing equipment for experiments and the devised magnetostrictive transducer are shown in Figure 4. An RPR-4000 RITEC pulser/receiver was used to produce a ten cycle Hanning windowed tone burst at 1 MHz frequency. The sensor design involves usage of amorphous material (METGLAS) 2605 SA1 Iron-based alloy, wound circumferentially around the tube surface. It has a melting point of around 1133–1178°C, curie temperature of 392°C and continuous service temperature of 150°C (Puthusseri & Balasubramaniam, 2019). There is no adhesive used for bonding it to the tube in order for the sensor to operate at elevated temperatures. Transmitter coils of 26 SWG and the receiver coils of 41 SWG copper wire encircling the MsS patch are used for providing dynamic magnetic field. Samarium Cobalt (SmCo) magnets of dimension 10 × 3 × 2 mm, are used to generate a static magnetic field with bias in the circumferential direction. SmCo magnets have curie temperature in the range of 700°C-850°C with a maximum working temperature of 350°C and capable of operating at high temperatures. The tube is subjected to a uniform temperature change along the entire length using a resistive heating coil wound over the tube and the sensor. The sample is slowly heated from room temperature of 25°C up to a temperature of 150°C and the time traces of signals are recorded for every 20°C rise of temperature whose amplitude variation is shown in Figure 9. The signals at 25°C and 150°C are shown in Figures 7 and Figure 8, respectively.