ELECTRIC GENERATOR

The invention relates to an electric generator (1), in particular an alternator (2) for a motor vehicle. The electric generator (1) has a rotor (3) and a stator, wherein the rotor (3) is non-rotatably fixed on a shaft (4) and one shaft end (6a) of the shaft (4) protrudes out of the rotor (3). An excitation coil (9) is arranged inside the rotor (3), wherein the excitation coil (9) can be brought into electrical contact with the outside by way of a slip-ring arrangement (29) with two slip rings (13, 14). The slip rings (13, 14) are fixed on the shaft end (6a, 6b) of the shaft (4) next to one another and spaced apart from one another. A bearing (23) is non-rotatably fixed on the shaft end (6a) of the shaft (4), wherein the shaft (4) with the rotor (3) is mounted rotatably about an axis of rotation (5) within the stator by the bearing (23). The bearing (23) is arranged at the shaft end (6a) between the rotor (3) and the slip rings (13, 14).According to the invention, a thermally insulating protective layer (27) is arranged between the shaft (4) and the bearing (23). The protective layer (27) encapsulates the shaft (4) and thermally insulates the bearing (23) from the shaft (4), so that heat from the rotor (3) and from the shaft (4) cannot be passed on to the bearing (23).The invention also relates to different methods for producing the electric generator (1).