Introduction  To evaluate the anti magnetic interference ability of electrical and electronic devices, it is necessary to carry out the corresponding magnetic field immunity test, in which the high uniformity steady-state magnetic field generator is the core component of a steady-state test device.

  Method  Taking the conventional Helmholtz and Maxwell square coil as the research object, the parameters were optimized through numerical calculation, and the coil structure that can produce high-performance magnetic field was obtained analytically. The finite element method was used to establish a model for calculation, and the correctness of the results was verified.

  Result  The general calculation formula of coil parameters is obtained through numerical analysis, and the two coil types are compared. The optimized Maxwell square coil with small size and power consumption is selected as the final structure.

  Conclusion  The research of this paper provides a detailed calculation process and design reference for the high uniformity steady-state magnetic field generator, and can provide a theoretical basis for the design of corresponding equipment in the electrical industry.