Operation Manual

ROTATING FIELD ASSEMBLY (ROTOR)

The rotating field assembly consists basically of four members: 1) the shaft assembly, 2) the

core assembly, 3) the field coil damper windings, and 4) balance lugs to provide a high degree of static

and dynamic balance.

CORE ASSEMBLY

The core assembly consists of a quantity of thin steel plates compressed and fastened together to

form a single laminated assembly. The field windings are wound around this assembly.

FIELD COIL

Field coils of heavily insulated wire are “wet” wound directly onto the poles. Field coil leads are

brought out to the rectifier assembly for connection to the source of DC excitation voltage.

BALANCE

The rotor assembly is precision balanced to a high degree of static and dynamic balance.

Although the balance will remain dynamically stable at speeds in excess of the design frequencies, the

prime mover should be adequately governed to prevent excessive over speed. High centrifugal forces

created by excessive over speed may damage the rotor windings and field coils.

BEARING

The generator rotor assembly is suspended on a shielded factory lubricated ball bearing. A visual

inspection of the bearing is recommended at typical service intervals. If signs of abnormal wear

or leakage are observed, the bearing should be replaced. Never use liquids of any kind to clean the

generator end and bearing.

STATOR ASSEMBLY

The stator assembly consists of laminations of steel mounted in a rolled steel frame. Random

wound stator coils are fitted into the insulated slots.