BLDC spindle motor cogging torque calculation with the moving material method in the finite element method

Instead of the moving band method, which is widely used when someone wants to perform a FEM calculation considering the rotation, a novel moving material method was proposed that makes the demand of HDD memory capacity smaller and the calculation time faster not by changing the mesh but by rotating the material properties in the magnet area. These results are especially useful to researchers who try to analyze the BLDC spindle motor considering the rotation of the outer rotor comprising a ring magnet and a back-yoke.