Electric motor cartridge for an electrically assisted turbocharger

An electric motor cartridge (1) configured for insertion in a housing and to drive a compressor wheel, the electric motor cartridge (1) comprising:

• a first cartridge housing portion (2);
• a second cartridge housing portion (3);
• and
• a rotor (21);
• the cartridge housing portions (2, 3) being coupled together so as to assemble the electric motor cartridge (1) by radially and axially encapsulating a stator (4) there between,
• wherein each cartridge housing portion (2, 3) has a semi-shell shape substantially comprised by a bottom portion (5, 6) and a cylindrical wall portion (7, 8),
• wherein at least one of the cylindrical wall portions (7, 8) forms a contact (14, 15) upon insertion of the assembled electric motor cartridge (1) in a housing,
• wherein one of the bottom portions (6) forms part of a fixed encapsulation barrier between the stator (4) and a compressor wheel to be driven by the assembled electric motor cartridge (1),
• wherein each cartridge housing portion (2, 3) provides a bore (12, 13) in the center of its bottom portion (5, 6),
• characterized in that
• the rotor (21) has peripheral portions (22, 23) inserted through the bores (12, 13) of the cartridge housing portions (2, 3) and a through hole axially extending through the rotor (21) and its peripheral portions (22, 23) for inserting a shaft (34) through the rotor (21).