Modeling of Air Gap Magnetic Characteristics of Anode Saturable Reactors under Impulse Current Excitation

In the traditional design process of magnetic apparatus, the core loss is estimated under standard sinusoidal at 50/60 Hz or square waveform excitation at high frequency. However, the air gap of the anode saturable reactor is changing due to vibration and temperature. The air gap limits the magnetic flux density by increasing the reluctance of the magnetic path and avoids core saturation. The quantitative analysis of gapped magnetic core loss and working efficiency have never been reported yet. In this paper, the theoretical calculation and electro-magnetic simulation are carried out to study the effect of shape and length of air gap on core loss and spatial magnetic field distribution so as to improve the loss calculation accuracy of the anode saturable reactor. The loss distribution and temperature rise especially near the air gap region are analyzed to optimize the design.