(f) Using a zig-zag motion, place a bandof one continuous piece over and near the end of theend turns.Using enough spread to keep the bandbelow the line of the rotor outer diameter, securethe end by lapping over the end. Binding must not beloose.(g) After all coils are inserted and boundas in (a) above, lace continuously using at least twoturns at each location with a slip tie on the secondturn. Lace at each tooth, separating the top coilsand the bottom coils.(h) Place the connection bundle beneath theend turns and lace as in (g), being sure to lace inthe connection bundle. (i) Refer to table 9-6 and figure 9-8 forexciter rotor winding data.9-6. Generator Reassembly and Installation.a. Reassembly.See figure 9-1 to reassemblethe ac generator.(1) Balance plates should be shrunk on theshaft. Heat balance plates in an oven to approxi-mately 200° C.Place heated balance plate on shaftand with a pipe or sleeve with a bore slightly largerthan the balance plate bore, tap the balance plateonto the shaft until it registers against the shaftshoulder.(2) The coupling hub is reassembled to therotor assembly by placing the hub in an oven andheating to 200° C.The hot coupling hub then slideson the shaft and key.(3) The diodes should be placed on the rotat-ing diode assembly, using a thermal conductionlubricant such as Burndy “Penetrox A“ or equiva-lent. Do not allow the lubricant on the threads ofthe diode or the torque measurements will be in-correct.CAUTIONThere are three forward polarity diodes(arrow towards threaded stud) and threereverse polarity diodes (arrow away fromthreaded stud). The diodes must be as-sembled with the three forward polaritydiodes on one heat sink and the three re-verse polarity diodes on the other heatsink. Assemble the diodes with nuts andlockwashers, using a torque wrench.Assemble with 30 inch pounds of torque.(4) Use balance weights assembled in holes ofbalance plate to dynamically balance complete rotorassembly within 2 inch-ounces.(5) Tighten screw (41) to 950-1100 inch-pounds and bend up corners of strips (42) against aflat side of screw (41).(6) At assembly apply light coating of grease(MIL-G23827) to the bearing bore of the endshield. Also add 0.9 to 1/4 cu. in. (1.0-1.5tablespoons) of grease to the bearing cavity on theoutboard side of the bearing and 0.45 to 0.7 cu. in.(0.5 to 0.75 tablespoons) of grease to the bearingcavity on the inboard side of the bearing.b. Installation Refer to paragraph 2-12.9-7. Generator Tests after Reassembly.Perform tests 1, 2 and 3 of operating tests (refer totable 16-1).Table 9-6. Exciter Rotor Winding Data (50/60 and 400 Hz)Type of winding3 phaseNo. of slots and coils36 slots 36 coilsNo. of coils per group6 groups of 2 24 groups of 1Turns per coil3 for 50/60 Hz -5 for 400 HzSpan1-4Conductor5 of AWG #16 (0.0508) - 50/60 HZ3 of AWG #16 (0.0508) -400 HzConnectionParallel 2 circuit WYE, (see fig. 9-8)Resistance0.023 ohm at 25° C - 50/60 Hz0.050 ohm at 25° C -400 HzInsertion sequence211/112/111/121/111 and repeatChange 49-25/(9-26 blank)
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