Effect of electrical resistivity on core losses in soft magnetic iron powder materials

Evolution of phosphate coatings during high-temperature annealing and its influence on the Fe and FeSiAl soft magnetic composites

“…Core loss mainly consists of hysteresis P h and eddy current loss P e . The eddy current loss contributes a significant proportion to the total core loss at high frequencies and can be greatly reduced by increasing the electrical resistivity of the SMCs [4]. Various types of insulating materials have been used as the coating layer of the magnetic powders for increased electrical resistivity of the SMCs, such as resins [5,6], oxides [7][8][9] and phosphates [10].…”

Fabrication of High Performance Fe-Si-Al Soft Magnetic Composites

“…It is well known that core loss is mainly composited of hysteresis loss and eddy current loss. Hysteresis loss varies linearly with frequency while current eddy loss veries with the square of the frequency [13]. Otherwise, Fig.7 shows that total loss of magentic powder core in magnetic annealing is smaller than that in annealing state, and the effective permeability of two annealing states don't present marked difference.…”

Interparticle Neck Connections in Innovative Insulated Iron Powder Compounds

“…contributes to the early stages of interparticle neck developments. According to [16,17] Fracture surfaces and TRS values show that, at 300 MPa, the strength and the area related to the interparticle necks can be correlated to the occasional broken insulated point-to-point surfaces that hinder the development of interparticles necks. Fig.…”