US Patent 10320262 Air cooled starter-generator

A starter-generator for a vehicle includes a housing, an electric motor-generator, a structural electronic substrate board, a printed circuit board and a fan. The electric motor-generator has a rotor disposed in the housing, a shaft fixed to the rotor, and a stator fixed relative to the housing. The structural electronic substrate board includes a metal base plate defining a first housing closure at a first end of the housing with the shaft extending therethrough. The printed circuit board is inside the housing on a side of the rotor opposite the structural electronic substrate board. The fan is fixed to the shaft between the rotor and the structural electronic substrate board.