To overcome the voltage regulation difficulty of permanent-magnet synchronous machine(PMSM),a hybrid excitation synchronous machine(HESM)with the radial structure of magnetic shunting type was designed.

Measurement and calculation of the magnetic shunt for current transformer;

Based on references involved in magnetic shunt and leakage magnetic flux due to heavy current leads of a large power transformer, key technique and technical path are founded.

Magnetic Circuit Analysis and Magnetic Torque Calculation of Magnetic Drive Technology;

Some key issues are discussed on the basis of the structure of difference sensor of cable tension,,such as magnetic circuit structure design and its definition of structure parameters,the selection of magnetic field strength,the definition of magnetic flux and the calculation of magnetomotive force by magnetic circuit analysis.