The DC reduction motor for printing machines is a common micro reduction motor in the electromechanical industry, but currently there is not much professional knowledge about the performance and materials of the reduction motor, as well as how manufacturers choose materials. Moreover, it is not something that can be understood in a day or two. The main focus should be on considering the magnetic field properties, the directionality and uniformity of the magnetic permeability of the stator core in various gear reduction motors, the working magnetic density of the reduction motor core, and the size of the core loss.