Nidec 22765-01, Manual

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Page 41
Assembly
Bearing Installation
Bearing is installed prior to installing the rotor.
1. Heat the bearing to 220 ° F (104 ° C) to 250 ° F (121 ° C) in a clean
oven or with an induction heater.
2. Start the heated bearing on the shaft. Then use a fiber or soft
metal tube to tap the bearing into place.
3. Ensuring that pressure is applied only to the bearing inner ring,
press the bearing onto the shaft until the inner ring seats against
the bearing shoulder on the shaft. Assemble the rest of the
generator after the bearing has cooled.
Overall Assembly
1. Float in the rotor until the rotor and stator laminations line up.
Position the rotor such that a full pole face is at the bottom.
2. Install the endbrackets. Support the rotor during installation. Put
a corrosion inhibitor on the bare mating surfaces to prevent rust.
3. Install the exciter armature and optional PMG as described
below.
4. Install the covers.
5. Install the coupling or drive plates.
6. Reconnect the load leads and exciter leads.
Exciter Armature and PMG Installation
See Figure 24.
1. Clean the shaft and inside of the exciter sleeve.
2. Place the key in the slot in the shaft.
3. Lay the generator field wires flat in the wireway with the wire
ends protruding past the end of the shaft.
4. Position the exciter armature assembly in line with the shaft, ad
turn the assembly to the position where the keyway in the exciter
sleeve is in line with the key in the generator shaft.
5. With hand force, push the exciter armature assembly over the
shaft, so the end of the sleeve is against the shoulder on the
shaft. When it is part of the way onto the shaft, start the field
lead wires through the wire hole or slot in the exciter sleeve. It
may be necessary to tap lightly on the exciter sleeve in order to
move the assembly over the key. Use a fiber or rubber mallet. If
installation is still a problem, use a heat gun to expand the exciter
sleeve.
6. Connect the exciter armature wires to the rectifier terminals.
NOTE: Do not pound on the rectifier or
armature windings. Component damage
may result.
CAUTION: Make sure all
components are clean before assembly.
NOTE: Torque fasteners to the values
specified in Tables 5 and 6 unless
otherwise specified.