Some key parameters of a single-sided hybrid linear stepping motor (HLSM) were analyzed for optimization by finite element method (FEM). The influence of the winding current on the normal force and the tangential force was studied by FEM with a certain machine volume, as well as that of the distance of the air-gap between mover and stator, and the relationship curves were given respectively. The characteristics of force-displacement with different tooth width/tooth pitch ratios were calculated to find out the optimum ratio for the maximum thrust and a lower normal force. The harmonic waves of the tangential thrust were analyzed by FFT in different ratios of tooth width/tooth pitch, which were conducted when the ratio of the forcer and that of the stator were equal and unequal respectively. The result shows that the range between 0.33 and 0.38 is preferable for the ratio of tooth width/tooth pitch to increase the thrust and its fundamental part while suppress the normal force, the favorable ratio of tooth width/tooth pitch is about 0.36 to obtain the maximum static thrust.
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