DEMARREUR DE VEHICULE AUTOMOBILE MUNI DE SORTIES DE BOBINES CONNECTEES SUR UN PONT DE CONNEXION ELECTRIQUE PAR SOUDURE A ULTRASONS

The invention relates to an electric motor for a motor vehicle starter, comprising: at least two positive-polarity brushes; at least one electrical connection bridge (91, 92) in the form of a flat section (961) connecting to the positive brushes; at least two field coils, each coil comprising an output (Sb) in the form a flat section (960) connected electrically to the electrical connection bridge (91, 92); and a welded portion (107) between part of the flat section (961) of the electrical connection bridge (91, 92) and part of the flat section (960) of the coil output (Sb), said welded portion (107) including a cavity (95) on a face opposite the welded contact face (970, 971), the height (L3) of said cavity (95) being at least 20% of a thickness of the flat section (960, 961) containing the cavity (95).