电磁连铸用高频磁场内磁感应强度的分布

用小线圈法测定了等幅高频磁场和调幅高频磁场内的磁感应强度，两种磁场的磁感应强度在空间分布的规律基本相同，即同一高度平面上沿径向方向从线圈中心至边缘其磁感应强度依次增加，在线圈高度方向上，磁感应强度在线圈高度的1/2附近达到最大值。等幅高频磁场的磁感应强度随高频电源输出电流的增加而增加，磁场调幅处理能提高磁场内的磁感应强度，提高调幅波信号的幅值电压，可有效提高磁场内的磁感应强度。

Magnetic Induction Density of High Frequency Magnetic Field for Electromagnetic Continuous Casting

The magnetic induction density, B, of amplitude-modulated and equiamplitude magnetic fields was measured by little coil method. The spacial distribution of B in amplitude-modulated magnetic field is almost same as that of equiamplitude magnetic field. The B progressively increases along the radial direction from center to edge of the coil. The maximum of B along elevation direction is closely under the central section of coil. The B of equiamplitude magnetic field is increased by increasing of the output current of high frequency power source. The amplitude modulation can improve the value of B, which is also increased with the increasing of the voltage of modulating wave.