Application of super microcrystalline core in the inverter welder;

Welding of the coiled cores for the generator of tractors and automobiles;

New Method to Calculate Angle Weight of Three-Phase Three-Limb Multiple Steps Laminated Core;

Reducing no-load loss of transformer iron core on locomotive;

Some features and dangers of earth fauh for iron core oftransformer are analysed.

This article describes some influence upon insulation test result affected by temperature, voltage increase speed, polarity, and whether iron core is earthed or not during transformer insulation test, and shows the reasons attribute to these influence.

Theory and practice for finishing coiled stator core with cold extruding process;

Stress analysis of rough trimming of the coiled stator core and the improvement of design for automatic slice loading;

Based on contact nonlinear FEM,it analyzes the intensity and rigidity of motor stator iron-core shiplap pressuring frame by ANSYS,which provides a good method for designing and calculating the motor structure.

The 2nd generator had a serious stator iron-core malfunction at one time in Qinhuangdao Power Generation Co.

Numerical calculation and analysis of stator iron losses due to rotational flux and magnet pole eddy-current loss in PMSM;

Based on the Bertotti iron loss separate model,a calculation model of iron losses of electric magnetic material fed by PWM inverter is proposed using the Bessel function,considering the influence of the inverter parameter,the numerical relationship of material loss between sinusoidal voltage supply and PWM voltage supply is presented,it provides a new theory of the study on electric material.