According to equivalent current method,the equivalent physical model was constructed to calculate the torque varying with clearance,relative angle and magnetic pole number between driving magnetic gear and driven magnetic gear of blood pump driving system.

This paper aimed at improving the design of a two-pole magnetic encoder.

Relationship between the sealing performance of nanometer magnetic fluid and magnetic pole parameters;

Through magnetic interaction force and magnetic field configuration relations , to proved a force upon paired magnetic dipole is perpendicular force type by experiment when permanent magnet structure is for paired magnetic dipole, at this condi- tions.

The no-load voltage waveforms of a 45 MW hydro-generator are optimized with the asymmetric poles design including the eccentricity of the pole shoes or/and the damper bars,and the optimization is implemented and analyzed by 2D moving electromagnetic field-circuit coupling model.

The expression of torque ripple(induction electromotive force ripple)and tooth-slot number,pole-pairs number for permanent-magnet DC motor is deduced based on basic theory of electromechanics in this thesis,which is utiliy and explicit.

The structure and working principle are analyzed,and reasonable magnet thickness and pole-pairs number are evaluated with magnet circuit calculation method and 3 di.