Polyphase starter motor/alternator has target holder attached to rear rotor fan plate, peripheral magnetic target and three Hall effect radial reader inserted through orifice in rear bearing plate

摘要

A starter motor/alternator for a motor vehicle comprises a claw type wound rotor (4) and a stator within bolted bearing plates (13,14). A target holder and magnetic target is located on the shaft (3) in the space between the rear bearing and the rear fan (44,45) which is normally occupied by a spacing washer. Three Hall effect readers (52) are inserted through holes in the rear bearing plate