Improvement of Flux Deflection With Light-Weight Magnetic Material
Improvement of Flux Deflection With Light-Weight Magnetic Material
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DOI：
10.1109/tasc.2014.2371874
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
K. Tsuzuki;S. Kase;Miki Motohiro;M. Izumi
中科院分区：
文献类型：
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作者：
K. Tsuzuki;S. Kase;Miki Motohiro;M. Izumi
研究高温超导(HTS)场极磁体产生的强化磁通是提高工业应用中机械效率的关键。提高临界电流密度可以进一步改善高温超导船用推进电机的工作电流。在我们以前的工作中，我们评估了磁通偏转对高温超导磁体临界电流的影响。磁通偏转是一种利用磁性材料控制垂直于高温超导带材a-b面的磁通的技术。由于材料的磁性，热损失的减少得到了证实。本文将介绍采用轻质磁性材料FINEMET作为磁通偏转器的验证实验结果。针对高温超导绕组因安装磁性材料而增加总重的问题，对磁通偏转器进行减重是实际应用的需要。与碳钢相比，FINEMET具有更高的饱和磁通密度和更高的磁导率。将一对磁通偏转器安装在与直流电流源相连的原型高温超导线圈上，测量了其I-V曲线。在采用轻质磁性材料的情况下，证实了生热减少了27%，与以前的材料相当。同时，实现了73%的减重。结果表明，FINEMET能有效地改善磁通偏转。是一种适用于实际高温超导推进电机场极磁体的可行材料。
Intensified magnetic flux generated by high-temperature superconducting (HTS) field-pole magnet has been studied for the key to improve the machine efficiency of industrial application. An increase of the critical current density allows a further improvement of the operating current in HTS ship propulsion motors. In our previous work, an effect of flux deflection to the critical current of HTS magnet was evaluated. Magnetic flux deflection is a technique to control perpendicular flux to the a-b plane of the HTS tape by magnetic material. Thanks to the magnetic properties of the material, heat loss reduction was confirmed. In this paper, the outcome of the verification experiment with a lightweight magnetic material FINEMET adopted as magnetic flux deflector will be described. In response to the results which increase of the total weight of HTS winding by mounting a magnetic material, weight reduction of the magnetic flux deflector is necessary for practical employment. Compared with the carbon steel, FINEMET has higher saturation magnetic flux density and higher permeability. I-V curve was measured while a pair of the magnetic flux deflectors were installed on the prototype HTS coil connected to the DC current source. In the case of adopting light-weight magnetic material, the reduction of heat generation was confirmed to be 27% which is equivalent to the previous material. At the same time, a weight reduction of 73% was achieved. Results show that FINEMET is effective to improve flux deflection. It is one of feasible material which can be adapted to the field-pole magnet of practical HTS propulsion motor.