44 l
Installation, operation and maintenance manual – Squirrel cage motor – WGM20 Line 14108242
8.2
VERTICAL MOTORS
NDE
DE
Figure 8.2: Vertical motor
Figure 8.2 legend:
1.
Frame
2.
DE cooling head
3.
NDE cooling head
4.
DE end shield
5.
NDE end shield
6.
DE bearing
7.
Grease reservoir
8.
NDE bearing
9.
Fan
10.
Shaft
11.
Rotor
12.
Stator
13.
Water leakage sensor
14.
Inspection cover
15.
Encoder protective cover
16.
KMT nut
17.
Encoder
18.
Drain
19.
Retainer
Before disassembling the motor:
1.
Disconnect the supply pipes from the cooling water and place the motor in horizontal position;
2.
Disconnect electrical wiring from motor and accessories;
3.
Remove the grease fittings (if any) and bearing grease reservoirs (7);
4.
Remove the shaft grounding brush (if any) and encoder (if any);
5.
To prevent damage to the rotor and coil heads, support the shaft on DE and NDE sides.
8.2.1
Disassembly
1.
Disconnect the cables of the bearings temperature
sensors in the accessories terminal box;
2.
Disassemble the DE bearing (6) and the motor DE end
shield (4), as described in item 7.10.9.3;
3.
Remove the KMT nut (16) that fasten the NDE bearing;
4.
Disassemble the NDE bearing (8) and the motor NDE
end shield (5) as described in item 7.10.9.4;
5.
Using a suitable device, remove the rotor (11) from
inside the stator (12), through the motor DE side,
taking care that the rotor does not drag against the
stator core and coil heads.
8.2.2
Assembly
To assembly the motor:
1.
Using a suitable device, place the rotor (11) into the
stator (12), inserting it through the motor DE side,
taking care that the rotor does not drag against the
stator core and coil heads ;
2.
Assemble the DE bearing (6) and the motor DE end
shield (4), following the procedure described in item
7.10.9.5;
3.
Assemble the NDE bearing (8), the KMT nut (16) and
the motor NDE end shield (8), following the procedure
described in item 7.10.9.5;
4.
Install the grease fittings (if any) and the bearing grease
reservoirs (7);
5.
Connect the cables of the bearing temperature
sensors on the accessories connection box;
6.
Install the shaft grounding brush (if any);
7.
Fill the bearing grease through DE and NDE grease
fittings.
