Patent ID: 7077092

Claim:
An engine starter driven by a battery to drive an engine having top dead centers comprising: a power supply line having a main switch; a starter motor including an armature, a series-wound field coil and a parallel-wound field coil, said armature, said series-wound field coil being connected to the battery via said power supply line when said main switch is closed; field current control means for controlling current supplied to said parallel-wound field coil; and starting current control means connected in series to said power line, wherein: said starter motor is arranged to have a torque to surmount a first top dead center even when voltage of the battery decreases by a predetermined voltage from its normal voltage; and said field current control means includes means for controlling voltage drop of the battery to be less than the predetermined voltage by changing current supplied to said parallel-wound field coil thereby changing rotation speed of said starter motor when said main switch is closed to supply current to said armature.