直线电机用高温超导块材磁体作用力—磁场特性分析
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摘要
本文以探究高温超导块材磁体在同步直线电机实际应用特性为目标,搭建了对磁场、三维电磁力信号同时采集的多物理场测试平台.实验探究了作为直线电机次级的高温超导块材磁体所受电磁力、俘获磁通随充磁电流、电机初级三相交流电电流幅值、频率等参数的变化规律.理论分析了高温超导块材俘获磁通在行波磁场中的衰减规律.基于所得结论,提出可有效抑制磁场衰减的方法—引入铁磁材料,并重点讨论该方法对初次级间电磁力的影响.
With the purpose of exploring the application characteristics of high-temperature superconductor bulk magnet in linear motor application, the force characteristics and trapped flux inside the bulk subject to traveling wave magnetic field are studied experimentally. A multi-physical parameters testing platform was set up to measure the electromagnetic force and trapped flux of bulk materials at the liquid nitrogen temperature of 77 K. Based on the test data, the relationship among the electromagnetic force, trapped flux in HTS bulk, magnetization current for field cooling process, amplitude and frequency of ac current feed to three-phase winding primary is studied. The long-time decay characteristics of the trapped magnetic field at different stator current amplitudes, frequencies were measured. An effective method of adding ferromagnetic disk to YBCO bulk to suppress the flux decay was discussed.
With the purpose of exploring the application characteristics of high-temperature superconductor bulk magnet in linear motor application, the force characteristics and trapped flux inside the bulk subject to traveling wave magnetic field are studied experimentally. A multi-physical parameters testing platform was set up to measure the electromagnetic force and trapped flux of bulk materials at the liquid nitrogen temperature of 77 K. Based on the test data, the relationship among the electromagnetic force, trapped flux in HTS bulk, magnetization current for field cooling process, amplitude and frequency of ac current feed to three-phase winding primary is studied. The long-time decay characteristics of the trapped magnetic field at different stator current amplitudes, frequencies were measured. An effective method of adding ferromagnetic disk to YBCO bulk to suppress the flux decay was discussed.
引文
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[22] Yamagishi K,Asaba I,Sekizawa S,et al.IEEE.Trans.on Appl.Supercond,15(2005),2879.
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[27] Ogawa J,Iwamoto M,Yamagishi K,et al.Physica C,386(2003),26.
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[29] Philippe M P,Fagnard J F,Kirsch S,et al.Physica C,502(2014),20.