THE COMPUTATION OF MAGNETIC-FIELDS OF PERMANENT-MAGNET CYLINDERS USEDIN THE ELECTROPHOTOGRAPHIC PROCESS

General analytic expressions for the magnetic field distributions crea ted by permanent magnet cylinders are derived in this paper. These exp ressions take into account a finite slope of the B-H loop in the secon d quadrant, and they are valid for arbitrary magnetization patterns wi thin the cylinders. They can be used for parametric studies of field s trength and can also be used to test new and existing numerical techni ques for computing the field due to permanent magnet materials. The th eoretical discussion is illustrated by some sample calculations.