Magnetic Field Calculation of an Air-Core Compulsator

Air-core machine is a special synchronous generator,which uses the principle of magnetic flux compression to reduce the inductance of armature,so that the instantaneous power output and short-circuit current can get the maximum under the condition of electrical pulse working.The winding pasted in the rotor adopted concentric non-trough structure,and the inductance was calculated through the simplification,making the winding equivalent to many rectangles.In the paper,analytical method was used to derive mutual inductance between parallel rectangles and the vertical rectangles and then the method was emploved to calculate the whole winding inductors.Finally,finite element simulation was carried out using the software Ansys,and the results were compared.