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Home > Mall Dynamic > Study On The AC Loss Measurement Of High Temperature Superconducting Tapes And Coils
High temperature superconducting materials refer to materials with superconductivity at temperatures exceeding 77 K, and their refrigeration costs decrease significantly compared to low temperature superconducting materials. Common high-temperature superconducting materials include Bi and Y series. Bi series materials need to be drawn, rolled and heat-treated to make Bi series superconducting strip, while Y series superconducting material is made into Y series superconducting strip by composite coating technology on flexible metal baseband. Under the action of natural field or external field, the magnetic inductance line begins to penetrate and gradually move from the outside of the Bi /Y high temperature superconducting strip. The pinning inside the superconducting strip will hinder the resistance effect of the magnetic flux flow, and the alternating external field will also produce eddy current in the substrate material, resulting in resistive loss. The heat generated by these resistance effects is the AC loss of the superconducting strip. At a temperature of 77 K, the AC loss generated by the superconducting strip will bring at least 15 times the energy loss to the refrigeration system [1], and may also cause local strip loss, seriously threatening the safe operation of the superconducting magnet. Therefore, the study of AC loss of HTS strip and coil, especially the study of AC loss measurement method, is of great significance for load evaluation of refrigeration system and safe operation of strip and coil magnets.
AC losses in HTS systems can be broadly categorized into two types: hysteresis losses and coupling losses. Hysteresis losses occur due to the irreversible magnetization process in superconductors when subjected to alternating magnetic fields. Coupling losses, on the other hand, arise from the interaction between the superconducting material and the surrounding magnetic field. Both types of losses contribute to the overall AC losses in HTS tapes and coils.
Accurately measuring AC losses in HTS tapes and coils is crucial for assessing their performance and optimizing their design. Various measurement techniques have been developed to quantify these losses. One common approach is the calorimetric method, which measures the temperature rise in the superconductor when subjected to an AC magnetic field. By monitoring the temperature increase, the AC losses can be determined. Another widely used technique is the magnetic method, which measures the magnetic field generated by the AC losses using Hall sensors or pick-up coils. This method provides a direct measurement of the losses based on the magnetic field strength.
Measuring AC losses in HTS tapes and coils presents several challenges. One significant challenge is the presence of thermal instability in HTS materials, which can affect the accuracy of temperature-based measurements. Additionally, the high magnetic field strengths and frequencies involved in AC loss measurements demand advanced measurement equipment capable of handling these conditions. Furthermore, the complex geometries of HTS tapes and coils introduce additional complexities in accurately quantifying the losses
Recent years have witnessed significant advancements in AC loss measurement techniques for HTS tapes and coils. Advanced cryogenic systems and improved temperature sensors have enhanced the accuracy and stability of temperature-based measurements. The development of high-frequency AC sources and high-resolution magnetic field sensors has allowed for more precise measurements of losses in high-frequency regimes. Furthermore, advanced numerical modeling and simulation techniques have been employed to better understand and predict AC losses in complex HTS systems.
The study on AC loss measurement of high-temperature superconducting tapes and coils plays a vital role in optimizing their performance and improving their efficiency. Accurate quantification of AC losses helps in the design and development of HTS systems for various applications. With the continuous advancements in measurement techniques and the deeper understanding of AC losses in HTS materials, the potential of high-temperature superconductors can be fully harnessed, paving the way for their widespread adoption in diverse fields and enabling technological breakthroughs.
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