Table 9-2. Rotor Winding Data (50/60 Hz)
0.390 ohms at 25° C
1 circuit (refer to fig. 9-4)
9 of AWG #16 (0.0508)
Turns per coil
No. of poles and coils
(e) Reverse wound core so leads are hori-
zontal and bake for one hour in forced convection
over at 165° C.
(f) Repeat steps b, c, d, and e two times
so that a total of three dips and takes are performed.
(g) The varnished wound rotor core should
be examined for complete coverage, uniform cover-
age with no strings or beads and with openings be-
tween extended position of slot tubes free of varnish,
blistering or peeling, and complete cure, with tack-
free surface and good bonding strength.
c. Generator Rebuilding (400 Hz). Proceed as
(1) Stator coil winding procedures. See figure
9-5 and table 9-3, and perform the procedures pro-
vided in step b (1).
(2) Stator dip and bake. Perform the procedure
defined in step b (2).
(3) Rotor coil winding.
(a) Inspect winding slots for any sharp cor-
ners at edge and in slot. Clean up as necessary.
(b) Examine bore and determine the direc-
tion in which the broach passed through the bore.
Place the leads on the end where the broach left the
bore. This is so the shaft will be pressed through
the bore in the same direction as the broach.
(c) Insert slot liners (3) in the slots and
position with equal overhang of the core on each end.
See figure 9-6.
(d) Insert the coils in the usual manner.
Position the coils as evenly as possible on each end.
Consult the coil limit diagram to be sure that the
two ends are adjusted to allow room for the connec-
tions, which must be within the coil limit diagram.
(e) Insert tapered edge top stick and drive
(f) Make interpole and lead connections as
required by internal connection diagram. See fig-
(g) Over each end, turn-wrap 20 turns of
double glass roving to provide banding support of
(h) With double roving, loop over the band-
ing and connnections and run on continuous piece of
double roving over all 24 coil ends. Burn all knots
with red hot duck bill pliers.
(i) Refer to table 9-4 for 400 Hz rotor
Table 9-3. Stator Winding Data (400 Hz)
Type of winding
No. Of slots and coils
No. of coils per group
Turns per coil
3 phase, dual voltage
108 slots 108 coils
36 groups of 2 and 36 groups of 1
AWG #16 (0.0508) and AWG #17 (0.0453)
12/6 ckt, (see fig. 9-5)
0.017 ohm at 25° C (T1-T4, etc.)