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利用磁探针测量了无接触熔炼铜坩埚内部的轴向磁场,得到了在相同半径、不同方位以及不同半径、同一方位上的轴向磁场的分布规律;并考察了励磁电流、电源频率以及励磁线圈与铜坩埚的相对位置对轴向磁场的影响。结果表明,轴向磁场在励磁线圈所在范围内较强,随着与励磁线圈中垂面轴向距离的增加而减弱,并表现出关于励磁线圈中垂面的非对称的分布规律;轴向磁场强度基本不随半径改变,且表现出关于中心轴线对称的分布规律;铜坩埚起到了使磁场均匀化的作用。另外还发现,轴向磁场随励磁线圈与铜坩埚底部距离的增大而减弱,随励磁电流的增大而增强,随电源频率的上升而减弱。
The axial magnetic field inside the copper crucible without contact smelting was measured by using the magnetic probe. The distribution of the axial magnetic field in the same radius, azimuth and radius and in the same azimuth was obtained. The effects of excitation current, power frequency and excitation Effect of relative position of coil and copper crucible on axial magnetic field. The results show that the axial magnetic field is strong in the region where the exciting coil is located and weakens with the increase of the axial distance from the vertical plane in the exciting coil and shows an asymmetrical distribution law about the vertical plane in the exciting coil. The intensity basically does not change with the radius, and shows the distribution of symmetry about the central axis; copper crucible played the role of uniform magnetic field. In addition, it is also found that the axial magnetic field decreases with the distance between the excitation coil and the bottom of the copper crucible, increases with the excitation current, and decreases with the increase of the power frequency.