The distribution in three-dimensional space of the electric and magnetic field of an uniformly moving electric dipole is calculated by analyzing the relationship between electromagnetic potential and the electric and magnetic field.

The distribution of the electromagnetic field of an uniformly moving electric dipole is calculated by analyzing the electromagnetic potential of the electric dipole and making use of the covariability of electromagnetic field in different inertial frame under the theory of relativity.

This article talks about the important significance of electromagnetic potential,introduce it into theory make the function of electromagnet field easy to solve and we can see the necessary to change old space time concept.

The permanent magnet EMF and the inductance of the machine are studied and calculated in this paper and the special method to lower the slot torque ripple for this kind of permanent magnet machie is analyzed.

Therefore providing the commander with timely, full-scale, dynamic electromagnetic situation has become more and more important.

Then it made analysis on several methods for electromagnetic environmental visualization,furthermore studied on the visualization of realizing electromagnetic situation 3D datasets using direct volume rendering,surface fitting and slice rendering,and on the basis of it,a 3D visualization system .

The system was divided into five modules,preprocess and building for geographical Environment,database management and maintenance,electromagnetic environment calculation and analysis,electromagnetic situation visualization,integration statistic and decision-making sustain.

A method of calculating armature MMF and its distribution on sixphase LCIfed synchronous motors is presented in this article.

In order to implement sensorless control for a square\|wave brushless DC motor,this paper presents a Terminal Voltage Method (TVM),in which the motor commutation is determined based on the waveform of exciting EMF.