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题名	超导块材脉冲磁化研究及超导永磁同步电机性能仿真; 超导块材脉冲磁化研究及超导永磁同步电机性能仿真
作者	1霍海宽,电工研究所
学位类别	硕士
答辩日期	2004
授予单位	中国科学院电工研究所
导师	1夏东,电工研究所
关键词	脉冲磁化 超导块材 数值计算 超导电机 仿真 Pulse magnetization HTS bulk Numerical calculation HTS electrical motor Simulation
其他题名	超导块材脉冲磁化研究及超导永磁同步电机性能仿真
学位专业	电机与电器
中文摘要	高温超导块材引入了强的磁通钉扎中心，可以俘获大量的磁通；磁通跳跃场很高，比低温超导体大1-2个数量级，具有更好的磁稳定性；这些因素奠定了HTS块材制作强磁场永磁体的物理基础。为了获得磁场，我们首先要对超导块材进行充磁，脉冲充磁方法简单、充磁速度快，损耗小，脉冲持续时间由电路参数决定，被认为是最有可能在实际应用中磁化超导块材的方式。我们运用磁通蠕动流动模型结合麦克斯韦电磁场方程从理论上模拟了单脉冲磁化后超导块材的剩磁分布，并且进行了相应的实验验证，理论和实验基本上符合。理论研究表明脉冲磁化过程中会产生大量的热并且导致温度的升高，温度最高处是在靠近超导块材边缘的地方，温度的升高导致块材电流密度的减小，进而使俘获磁场减小。单脉冲充磁的效果与外磁场的幅值密切相关，当外磁场不是足够高时，磁化后块材磁场不能饱和，此时磁场中心存在一个凹陷，磁场的均匀性很差。如果外磁场超过一定的幅值，磁化产生的热量将起到决定性作用，这时的超导块材的剩磁将随着外磁场的峰值的增大而减小，并月．由于急剧的温升产生很大的热应力使块材碎裂。通过铁辘和多脉冲技术可以使块材的俘获磁场接近永磁体；通过环氧树脂注入技术可以增加块材的强度，防止块材的碎裂。当单块超导块材的磁场无法满足要求时，我们可以将块材进行叠加，垂直叠加可以增加轴向磁场，而平行摆放对于轴向磁场的影响很小。我们将脉冲磁化以后的超导块材进行叠加，用作超导永磁同步电机上的永磁体，并且用ansoft软件进行了仿真，仿真结果表明电机可以在同步速上稳定运行。 HTS bulk can trap much magnetic flux for its strong pinning function and has higher flux jumping field than low temperature superconductor bulk, which is the basic factor for HTS bulk used as the permanent magnet. The bulk must be magnetized before used as a magnet. Pulse magnetization is simple and fast. The loss is small and the time of pulse can be changed according to electrical circuit. So the pulse magnetization is regarded as one of the most promising method in practical field. We simulated the single pulse magnetization process using flux flow-creep model and MAXWELL equations and carried experiment to test the validity of the theory. It seems that the simulation results are coincident with the experimental ones. We also can see that much heat generated during the pulse magnetization process and resulted in the temperature rise, which reduce the electrical current density of HTS bulk. The point, which has the highest temperature, is near the edge of the bulk. The effect of single pulse magnetization has close relation with amplitude of pulse field. If the pulse field is small, the remnant magnetic field of bulk cannot be saturated and a dip produced at the center of bulk. On the contrary, if the amplitude of pulse field is very high and exceeds a certain value, the remnant magnetic field of bulk decreases because of much heat and thermal stress produced by the temperature rise will make the bulk cracked. We can use the ferrite yoke technic and multi-pulse technic to improve the shape of magnetic field. In order to avoid the crack, the epoxy resin is impregnated into the bulk and the strength of bulk can be improved. Several HTS bulks are overlapped to meet the need in practice. Vertical overlapping can increase axial field, but horizontal laying has little influence on the axial field. We designed a synchronous electrical motor, whose rotor is composed of overlapped HTS bulks. The simulation results show that the motor can rotate stably as the synchronous speed.
语种	中文
公开日期	2010-10-18
页码	52
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7353]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1霍海宽,电工研究所. 超导块材脉冲磁化研究及超导永磁同步电机性能仿真, 超导块材脉冲磁化研究及超导永磁同步电机性能仿真[D]. 中国科学院电工研究所. 2004.

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