The invention relates to a device for fixing permanent magnets inside the cylinder head of a field winding of an electric engine. The inventive device comprises spring clips (12) which are disposed between the permanent magnets in order to ensure the angular positioning and the axial and radial support of said magnets against the inner wall of the head. The end of each clip (12) which first penetrates the head when the permanent magnets are being inserted, comprises means for axially sliding on the inner cylindrical wall of the head, while preventing any contact with an end edge of the clip. Moreover, the clip is set apart from the head by means of at least one boss (17) which is provided on the core (16), and said boss is in turn set back from the edge and disposed between two fins (14) for the axial locking of the magnets.