The relation of the temperature, frequency and initial permeability, quality factor and saturation magnetic induction with increasing of ZnO content and quantitative Ee2O3 in MnZn high permeability ferrite is researched.
The experiment of measuring magnetic induction by the impact method is quantatively analysed in theory,pointing out that the action tlme of pulse current is the main factor influencing measuring results and giving an equation to correct experiment results.
Microstructure is converted from typical dendrite to cell as the increase of magnetic induction intensity from 0 to 0.15 T with a tow-rate of 20 μm/s,50 μm/s,100 μm/s,200 μm/s,respectively The phenomenon was understood based on TEMHD and MHD(magnetic hydro-dynamic)effects.
Influence of design parameters on axial magnetic flux density distribution, distribution of eddy current on contact plate, phase difference and conductor resistance for 1/2, 1/3 and 1/4 turns axial magnetic field (AMF) electrode of vacuum interrupters has been investigated and analyzed.
Through solving the boundary value problem, the magnetic vector potential A is gained. And the expression of magnetic flux density B is got by making use of the relation of magnetic vector potential A and magnetic flux density B. Finally, the equation of the magnetic flux lines is given by way of describing the distributing of the magnetic field.
Several special problems in inverter transformer are analysed. It contains: the magnetic flux density of the transformer stimulated by SPWM wave,the reason of bias magnetization,the appearance of transformer saturation due to bias magnetization ,and the relationship between the endurance to bias magnetization and the parameters of transformer.
This new method has been used to compute the model B of TEAM workshop problem 21.The computed results of the normal component magnetic flux density near the surface of the steel plate approach to the measured results.