The skin depth in the helical stator is calculated and is compared with an approximation widely used in the m.

This article compares the skin depths between these two kinds of waves,and find the skin depth of the wave based on a kind of special fu.

In view of disadvantages in present defect reconstruction methods,such as over-long time or excessive need for training samples,a new defect reconstruction method based on similar model and genetic algorithm was investigated as follows:similar model between non-axisymetric defect and axisymetric defect was represented,and proportionality factor was deduced by skin depth equation.

Based on the current distribution regularity of a conductor, this paper analyzed the shortcomings of the present mesh approaches, and determined the calculation method to obtain the mesh numbers of the equal area mesh, put forward a novel multi-skin depth non-even mesh method (MSDNEMM), which is applicable to the high frequency and large dimension conductor.

The numerical calculation results showed that armature motion can cause significant velocity-skin effect,the current tends to flow to surface and has high concentration at the left-hand corner of the rail-armature interface,at the same time,this leads to erosion and damage to the armature because of ohmic heating.