The paper presents a comparative analysis of the space harmonics developed by a twophase induction machine with common construction (two variants) and a variant with an original special geometry. The results put in view that for the new variant, the third order harmonics that have a negative influence, practically vanish in condition of low saturation operation. The paper presents also the results corresponding to a saturated regime.

Keywords: Two-phase induction motor, Space third order harmonic influence, FEM analysis, Optimisation of magnetic circuit.