LUCAS Alternators: Description

Lucas ACR model alternators have an integral voltage regulator mounted in the slip ring end bracket. The stator consists of star-connected, 3 phase windings on a ring end cover and drive end bracket. The rotor is either an 8 or 12 pole type with the field windings connected to 2 face-type slip rings. It is supported in the drive-end bracket by ball bearings and in the end cover by needle roller bearings. One positive and one negative carbon brush ride against concentric brass slip rings. The heatsink-rectifier, terminal block assembly incorporates 6 silicon diodes, forming a full wave rectifier bridge circuit, and 3 diodes which supply current to the rotor windings.