Section XIV. MAINTENANCE OF GENERATOR ASSEMBLY

TM-5-6115-584-12 Generator Set Diesel Engine Driven Tactical Skid Mtd. 30 Kw 3 Phase 4 Wire 120/208 and 240/416 Volts Manual
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TM 5-6115-584-12 NAVFAC P-8-622-12 Section XIV. MAINTENANCE OF GENERATOR ASSEMBLY TO-35C2-3-456-1 TM-05682C-12 4-53. DESCRIPTION AND FUNCTION. semi-conductor “diodes mounted on two heat sinks, a voltage regulator and current-voltage transformers. The generator (main alternator) (see figure l-l) is The exciter armature and the bridge rectifier assem- a single bearing, splashproof, self -ventilated unit, with bly are mounted on the rotor shaft of the synchronous a flange to attach to the engine flywheel housing. Major generator components are stator, rotor, and generator and are connected to the generator field windings. The stator of the brushless exciter con- brushless exciter. The stator is composed of a com- sists of field coils wound on the poles and attached pressed stack of one piece laminations held in posi- to the generator endbell. During operation of the tion by stator bars welded axially on the outside generator, the three-phase power generated in the diameter of the laminations. A steel wrapper welded rotating exciter armature is applied directly to the to these bars provides the generator frame. The rotating rectifier assembly. The six diodes, mounted generator windings each occupy two groups of slots on rotating heat sinks, are connected to forma three- 180 mechanical degrees apart. The generator rotor is phase, full-wave bridge. The direct current output of composed of one piece rotor laminations, stacked, the bridge rectifier is applied to the rotating field compressed, and held in position by copper damper of the generator. Thus, the two assemblies; exciter bars welded to the copper end laminations. Rotor armature and synchronous field form a single rotating windings are made of Type L2 Class 155 copper wire assembly, enabling electrical connections to be made insulated from ground with MIL-I-22834A synthetic without the use of brushes, collector rings or com- bonded paper. The rotor is press fitted and keyed to mutator. Excitation current for the stationary field the rotor shaft, and balanced. The brushless ro- coils of the excitation unit is supplied by the synchron- tating exciter with rotating rectifier unit is used for ous generator, and controlled through the static type providing excitation current to the rotating field of the automatic voltage regulator. The voltage regulator generator. The complete excitation unit consists of continuously compares the output voltage of the four basic component assemblies: a three-phase ro- tating armature, synchronous generator with a stable reference volt- alternating current generator; a age. The difference between the two voltages con- three-phase full-wave bridge rectifier composed of six stitutes an error signal which indicates an output 4-56 Figure 4-45. Generator Screen-Guard

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