Numerical and experimental analysis on the planar force and the magnetic field in a DC Linear Stepper Motor

This work presents the development and test of a DC Linear Stepper Motor (LSM), brushless, with permanent magnets and a ferromagnetic static core, also called secondary, where six insulated coils, electric independent from each other are mounted. The mover part, also called primary, is formed by a ferromagnetic structure where two NdFeB permanent magnets are fixed. A mechanic suspension system allows the mover to move linearly along of x-axis and keep the air gap constant. This movement is possible through the correctly excitation of the coils, from the drive control system, where the coils receive a pulsed electric current. A numerical static analysis by means of finite element method (FEM) produced the verification of magnetic flux density and the linear traction force as function of DC current excitation applied in each coil. With the experimental results proposed, it is possible to obtain the same analysis and make a comparative study between these measurements.