Study on composite magnetic field device for biological effect of electromagnetic field

Inhalt:
A composite magnetic field device is proposed in this paper that can produce a composite magnetic field, even a single magnetic field. The device is usually applied to the study of electromagnetic field biological effects. In addition, it consists of two orthogonal Helmholtz coils. Because the spot is located in the section of the coil, the integral term will appear a flaw point so that the calculation of the magnetic field is complex. In order to avoid the problems caused by these flaw point and nonsense point, it adopts the additive of magnetic field and formula of magnetic field of the axisymmetric coil. This paper derives the formula of magnetic field about the coil parameters, calculates the magnetic field distribution on the axis by Matlab, and obtains the magnetic density through the simulation in Ansoft Maxwell. The simulation results show that the magnetic field uniformity is better than 5% in the study area.