针对交流二极磁铁的磁场特性和涡流问题,利用电磁场分析软件对磁铁进行了优化设计和温度场计算,确定了交流二极磁铁关键技术的方案。对交流二极磁铁极头端面采用了罗高斯基曲线和谐波削斜的方法来提高磁铁磁场质量; 对铁芯端部和端板进行开槽优化设计,有效切断磁铁端部主要的涡流回路,降低了磁铁温升; 磁铁线圈采用铝绞线导线进行绕制,以减少磁铁线圈内的涡流损耗。最后,通过对样机磁铁的测试,磁场均满足物理要求,磁铁温度也控制在安全范围内。

According to magnetic field properties and the eddy currents in AC dipole magnet, magnet design and the thermal simulation are performed by the electromagnetic field analysis software and the schemes of key technology are determined. The Rogowski curve and the harmonic chamfering method are applied to improve the magnetic field quality. Slit arrangement on the end plates of the dipole can cut down the eddy currents effectively and lessen the temperature rise. Coils of dipole magnet are made of Al-stranded conductors for the reduction of AC eddy losses. The measurement results and the temperature test of the prototype magnet are described and discussed. The magnetic fields of the prototype meet the requirements and the temperature rise is in the safety range.