SECTION III. PRINCIPLES OF OPERATION.

TM 9-2920-252-34&P

SECTION III. PRINCIPLES OF OPERATION.

armature and exciter rotating diodes to the coolest

1-8. GENERATOR OPERATION.

available oil. The oil flows back through spirally cut

grooves (5) in the outer shaft, collecting the main rotor

NOTE

heat.

Reference

numbers

shown

parentheses refer to the sectional view

of the generator cooling system

c. The oil is discharged at anti drive end into

passages (6) in the end bell which carry the oil to the two

rectifier heat sinks (7). The rectifiers are mounted in

these aluminum heat sinks, each of which contains two oil

passages (8). The oil moves through the two rectifier

heat sinks in parallel flow and discharges to the housing

a. Cooling System. The cooling of the generator is

connections (9).

accomplished by circulating filtered engine oil from the

engine main gallery line through the generator and back

to the engine oil pan. The generator oil pump, with its

d. From the housing connections, oil flows through

own bypass valve, will maintain relatively constant

spiral machined grooves (10) in the housing collecting the

pressure and flow of cooling oil through the wide speed

main stator winding heat as it proceeds to the end of the

range of the generator. The oil is for cooling only, it does

stator and out through oil discharge port (11).

not lubricate the generator.

1-9. VOLTAGE REGULATOR OPERATION.

b. The engine main gallery line supplies oil to the

The voltage regulator provides voltage regulation, current

suction side of the generator oil pump (1). The oil out of

limiting, and overvoltage protection in addition to

this pump is discharged into the rotor shaft center tube (2)

automatic operation of a starter cut-off relay (Figure 1-6).

and flows to the drive end (3) of the generator. An

aluminum heat sink (4) conducts heat from the exciter

1-4