Compact unitary starting motor and charging generator with recessed clutch

A unitary engine starting motor and charging generator device including a plurality of revolving-field poles (102a, 102b) mounted on a crankshaft (8) of an engine and serving as a carrier for a clutch (16) operably coupled between said crankshaft and a transmission drive shaft (17), field coils (103) for exciting said revolving-field poles, an armature core (104) secured on an engine body (13), and an armature coil (105) wound thereabout, characterized in that a first annular recess (25) is formed in the axial direction in an end of said revolving-field poles on a clutch side thereof, a clutch disc (18) which contacts said revolving-field poles, a pressure plate (19) which presses said clutch disc toward the revolving-field poles, and a disc-shaped clutch spring (20) are disposed fully within said recess to attendantly reduce the overall axial length of the device, a second annular, axial recess is formed in an opposite end of said revolving field poles on a crankshaft side thereof, and an elongate crank angle detector (106) is disposed within said second recess in a radial orientation to further reduce the axial length of the device, and wherein said motor and generator are commutatorless.