抑制电磁干扰的悬浮间隙传感器检测线圈结构设计

Design of Measurement Coils Structures for Levitation Gap Sensor to Decrease Electromagnetic Interferences

高速磁浮列车悬浮间隙中存在着牵引磁场、悬浮磁场等多种磁场,它们的高次谐波耦合到检测线圈中容易形成电磁干扰对悬浮间隙传感器造成影响。通过设计8字结构线圈,大幅度抑制了这种共模形式的电磁干扰。针对双检测线圈可能存在相互电磁干扰问题,通过调整双线圈之间相对位置,使两线圈间互感接近于零时,就可消除该种干扰,据此,确定两检测线圈间错位1/3线圈长度,通过试验验证了可行性。

There are many kinds of magnetic fields in the levitation gap in high speed maglev train,such as traction magnetic fields,levitation magnetic field,whose high harmonic will affect the levitation gap sensor by means of couple with measurement coils easily.An 8-shaped measurement coil is designed to decrease these types of common mode interferences.To solve the interference problem between the two measurement coils,positions between two coils have been staggered to decrease interferences by decreasing inductances between two coils to zero.Based the rules,the staggered position is judged as one third of length of coils,which has been proved feasibility.