Electric motor unit (1, 100) comprising a casing (2, 102), a first electric motor (3, 103) and a second electric motor (4, 104), housed within said casing (2, 102), wherein said casing (2, 102) comprises a first half-shell (5, 105), a second half-shell (6, 106) and a spacer element (7, 107) interposed between said first half-shell (5, 105) and said second half-shell (6, 106), wherein said first half-shell (5, 105), said second half-shell (6, 106) and said spacer element (7, 107) are removably connected to each other by means of connection means (8, 108), said electric motor unit (1, 100) comprising a drive shaft (18, 118), which can be rotatably actuated around a rotational axis (17, 117), operatively connected to said first electric motor (3, 103), a drive shaft (23, 123), which can be rotatably actuated around said rotational axis (17, 117), operatively connected to said second electric motor (4, 104), said drive shafts (18, 118; 23, 123) can be rotatably actuated around said rotational axis (17, 117) in an independent way with respect to each other, wherein said first electric motor (3, 103) is housed in a position interposed between said spacer element (7, 107) and said first half-shell (5,105), wherein said second electric motor (4, 104) is housed in a position interposed between said spacer element (7, 107) and said second half-shell (6, 106), said first electric motor (3, 103) comprising a stator with winding (10, 110) and said second electric motor (4, 104) comprising a stator with winding (10, 110), characterised in that said first half-shell (5, 105) has, at the portion which during use faces said spacer element (7, 107), an inner annular seat (9, 109) for at least partially housing said stator (10, 110) of said first electric motor (3, 103) and said second half-shell (6, 106) has, at the portion which during use faces said spacer element (7, 107) an inner annular seat (9, 109) for at least partially housing said stator of said second electric motor (4, 104), said spacer element (7, 107) has at opposite end portions which during use respectively face said first half-shell (5, 105) and said second half-shell (6, 106) a first inner annular seat (11, 111) and a second annular seat (12, 112) for at least partially housing respectively said stator (10, 110) of said first electric motor (3, 103) and said second electric motor (4, 104), wherein said first half-shell (5, 105) and said second half-shell (6, 106) each have, on the outer part thereof, at least one pair of flanged elements provided with a through opening, and wherein said means (8, 108) for removably connecting said first half-shell (5, 105) with said spacer element (7, 107) and with said second half-shell (6, 106) are configured engageable in said through openings of said flanged elements of said first half-shell (5, 105) and of said second half-shell (6, 106). wherein said first half-shell (5, 105) and said second half-shell (6, 106) each have, on the outer part thereof, at least one pair of flanged elements provided with a through opening, and wherein said means (8, 108) for removably connecting said first half-shell (5, 105) with said spacer element (7, 107) and with said second half-shell (6, 106) are configured engageable in said through openings of said flanged elements of said first half-shell (5, 105) and of said second half-shell (6, 106).