ARMY TM 9-6115-643-24AIR FORCE TO 35C2-3-445-22The stationary exciter field assembly is mounted in the main generator frame. The exciter armature is press fit andkeyed onto the shaft assembly. The rotating rectifier assembly slides over the bearing end of the generator rotor shaft andis secured with bolts and washers to an adapter hub which is shrunk on the generator shaft.4.15.4Rotating Rectifier Bridge. . The rotating rectifier bridge consists of rectifying diodes mounted on a brass heatsink which is in turn mounted on an insulating ring. The entire assembly bolts to the adapter on the generator shaft. There-fore, the rotating rectifier assembly will rotate with the exciter armature eliminating the need for any sliding contacts be-tween the exciter output and the alternator field.4. 1 5.5 Exciter Field.. The exciter field on the high frequency exciter consists of laminated segments of high carbon steelwhich are fitted together to make up the field poles. The field coils are placed into the slots of the field poles.4.15.6 Exciter Field Coil Voltage Source. Field coil DC voltage is obtained by rectifying the voltage from a phase toneutral line of the generator output, or other appropriate terminal to provide the needed voltage reference.The rectifier bridge is an integral part of the static regulator. The static regulator senses a change in the generatoroutput and automatically regulates current flow in the exciter field coil circuit to increase or decrease the exciter fieldstrength. An external adjust rheostat sized to be compatible with the regulator is used to provide adjustment to the regula-tor sensing circuit.4.15.7Balance. The rotor assembly is precision balanced to a high degree of static and dynamic balance. Balanceis achieved with the balance lugs on the field pole tips. The balance will remain dynamically stable at speed in excess ofthe design frequencies.4.15.8Bearing. The generator rotor assembly is suspended on shielded, factory lubricated ball bearings. They aregreased for life and do not require lubrication.4.15.9Stator Assembly. The stator assembly consists of laminations of steel mounted in a rolled steel frame. Randomwound stator coils are fitted into the insulated slots.Make sure unit is completely shut down and free of any power sourcebefore attempting any repair or maintenance on the unit. Failure to fol-low this procedure could result in injury or death by electrocution.4.16.1Removal.a. Shut down generator setb. Open battery access door and disconnect negative battery cable.c. Remove generator set rear housing section, paragraph 2.18.1.d. Loosen bolts(19, FIGURE 3-1) and lower engine support brackets (22) to rest on skid base. Tighten bolts (19).If necessary, place wooden shims under brackets to ensure contact with skid base.Rated capacity of overhead hoist should be at least 1,000 Ibs (454 kg).e. Attach lifting harness to overhead hoist and generator lifting eye, and take up slack.f. Remove screw (1, FIGURE 4-8), washer (2), and screen/cover (3) from generator case.g. Remove bolts (4) and Iockwashers (5) securing generator drive disc to engine flywheel.h. Remove bolts (6) and Iockwashers (7) securing generator to engine flywheel housing.i.Remove nuts (8), washers (9), snubbing washers (10), bolts (11), and Belleville washers(12) securing generatorto skid base.4-29
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