A Compact 3D Helmholtz Coil Designed for EMC Testing

In this paper, a 3D Helmholtz coil used for EMC (Electromagnetic Compatibility) test is proposed. The design consists of three paired orthogonal square Helmholtz coils. High-precision reconstruction of complex magnetic field environment can be achieved with audio frequency power amplifier and three-channel signal generator. It works at 0-400 kHz and weighs 30.5 kg. To verify the proposed design, both simulations and measurements are conducted. The results show that the coil has good performance at 0-400 kHz, which conclude coil factor, coil impedance, limit line compliance test and magnetic field uniformity.