Table 9-1. Stator Winding Data (50/60 Hz)Type of windingNo. of slots and coilsNo. of coils per groupTurns per coilSpanConductorConnectionResistance3 phase, dual voltage84 slots 84 coils741-156 of AWG #15 (0. 0571 dia)4.2 ckt, (See fig. 9-3)0.026 ohm at 25° (T1-T4, etc.)(a) Preheat wound core for 1 1/2 hours (2(e) With the rotor body turning on the ma-hours maximum) in forced convection oven maintain-chine, guide the wire into the slots for the specifieded at 170° C.number of turns. Hold the wire with enough tensionon the tension blocks to assure a hard firm winding.(b) Cool core down to a temperature of 1050Traverse the wire at the end turns and not in theto 115° C and dip at this temperature-into varnish,connection end up, until all bubbling stops, or for 3minutes, whichever is longer.(c) Remove wound core and drain connectionend up for four minutes.(d) Rotate wound core so connection end isdown and drain for one minute.(e) Bake wound core with slots in horizontalposition for 2 hours in forced convection oven main-tained at 170° C.(f) Repeat steps b, C, d, e and f two timesso that a total of three dips and bakes are performed.(g) The wound stator should be examinedfor complete coverage, uniform coverage with nostrings or beads and with openings between extendedposition of slot tubes, free of varnish, blistering orpeeling, and complete cure with tack-free surfaceand good bonding strength.(3) Rotorcoilwinding.(a) Inspect winding slots for any sharp cor-ners at edge and in slot. Clean up as necessary.(b) Screw support studs into tapped holesat bottom on slots. See figure 9-4.(c) Examine the bore and determine thedirection in which it was removed. Place the leadson the end where the shaft left the bore. This is sothe shaft can be pressed thru the bore in the direc-tion it was removed.The center of the rotor stackmust be located 11.48 inches from the hub end ofthe shaft.slot, as much as possible. This prevents excessivebuild up of the wire in the slot.(f) Place one spacer tool at the end of stackand another in the approximate middle of the winding.(g) Place winding clamp in position overstud and force into position so that nut can be tight-ened over end of stud.(h) Connect poles and leads per connectiondiagram. See figure 9-4. Use cold connectors andinsulate with tubing.(i) Tie the end turns with glass roving.(j) Seal all knots by momentarily pressingwith “hot” pliers long enough to fuse the roving.Heat pliers in gas flame to “Black Heat” about300° F.(k) Refer to table 9-2 for winding data.—(4) Rotordipandbake.(a) Preback wound core for one hour inforced convection oven at 165° C.(b) Dip hot wound core in varnish for oneminute with leads up.(c) Remove wound core and drain for threeminutes with leads up.(d) Rotate wound core with leads down anddrain for one minute.(d) Insert slot liners as the poles arewound.Hold in place with sacrifice adhesive tape.9-11
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