Trapped magnetic field measurements on HTS bulk by peak controlled pulsed field magnetization
Trapped magnetic field measurements on HTS bulk by peak controlled pulsed field magnetization
复制标题
通过峰值控制脉冲场磁化对高温超导块体进行俘获磁场测量
DOI：
10.1088/1742-6596/234/3/032023
复制
发表时间：
2010
影响因子：
2.1
通讯作者：
M. Izumi
中科院分区：
文献类型：
--
作者：
T. Ida;M. Watasaki;Y. Kimura;M. Miki;M. Izumi
在过去的几年里，我们研究了用熔融织构Gd-Ba-Cu-O块体磁体组装的高温超导同步电机。在不降低电机输出功率的前提下，利用高温超导磁体的强磁场，对块体进行有效的单脉冲磁场磁化，使电机体积变小。在以前的研究中，我们利用波形控制脉冲磁化(WCPM)方法将HTS块材磁化成良好的锥形磁场分布。WCPM技术使主动控制磁通运动所依赖的波形成为可能。我们产生了上升沿可控的高温超导块体磁化脉冲波形，以抑制降低磁化效率的磁通运动。缓慢上升时间的脉冲最大磁通密度不超过静场磁化捕获的最大磁通密度。但是，在施加上升时间较快的脉冲时，大大超过阈值的磁通量会穿透体层，造成俘获磁场分布的混乱。这一事实表明，脉冲磁化时的阈值可能影响动态磁通运动。本研究采用可控任意梯形脉冲对Gd-BaCuO块材进行磁化处理，控制其最大磁通密度不超过阈值。我们将介绍俘获磁场的特性和产生受控脉冲场的技术。
For the past several years, we have studied the high-temperature superconducting (HTS) synchronous motor assembled with melt-textured Gd-Ba-Cu-O bulk magnets. If the single pulse field magnetizes a bulk effectively, size of electrical motor will become small for the strong magnetic field of the HTS magnets without reducing output power of motor. In the previous study, we showed that the HTS bulk was magnetized to excellent cone-shape magnetic field distribution by using the waveform control pulse magnetization (WCPM) method. The WCPM technique made possible the active control of the waveform on which magnetic flux motion depended. We generated the pulse waveform with controlled risetime for HTS bulk magnetization to suppress the magnetic flux motion which decreases magnetization efficiency. The pulsed maximum magnetic flux density with slow risetime is not beyond the maximum magnetic flux density which is trapped by the static field magnetization. But, as for applying the pulse which has fast risetime, the magnetic flux which exceed greatly the threshold penetrates the bulk and causes the disorder of the trapped magnetic distribution. This fact suggests the possibility that the threshold at pulsed magnetization influences the dynamic magnetic flux motion. In this study, Gd-Ba-Cu-O bulk is magnetized by the controlled arbitrary trapezoidal shape pulse, of which the maximum magnetic flux density is controlled not to exceed the threshold. We will present the trapped magnetic characteristics and the technique to generate the controlled pulsed field.
影响因子：
1.8
作者：
Matsuzaki, H;Kimura, Y;Kitano, M
通讯作者：
Kitano, M