Aiming at problem that it takes too long for Magnet to simulate and analyze on micro-magnetic fluxgate

a co-simulation analysis method combining Magnet with MATLAB is proposed. 3 D model for fluxgate probe based on Magnet is built

and corresponding magnetic flux of induction coil is obtained by simulation calculation; the obtained induction coil flux is converted to equivalent small current through combined with MATLAB.While the equivalent small current is superimposed with the exciting current

the change of the induction coil flux under the effect of measured magnetic field is calculated through the formula provided by the simulation software Flux.After the total magnetic flux of the induction coil is obtained

and the induced voltage is obtained by time derivative.Under condition of micro racetrack iron core fluxgate

it is shown by comparing calculation results of Magnet simulation with Magnet-MATLAB co-simulation that when the external magnetic field is less than 5 μT

the output signals of the two simulated fluxgate are the closest; co-simulation calculation time is less than 10 min

which is greatly reduced compared with more than 30 hours time consuming on full model is simulated by Magnet.