14108242 Installation, operation and maintenance manual – Squirrel cage motor – WGM20 Line l 43
8
MOTOR DISASSEMBLY AND ASSEMBLY
ATTENTION
All the repair, disassembly and assembly services must be performed only by properly qualified and trained
professionals; otherwise, equipment damage and personal injury may occur. If any further explanations are
necessary, consult WEG.
The disassembly and assembly sequences depend on the motor model.
Always use proper tools and devices. Any damaged part (cracks, dents on machined parts, faulty threads)
must be replaced, avoiding restorations.
8.1
HORIZONTAL MOTORS
NDE
DE
Figure 8.1: Horizontal motor parts
DE = Drive end
NDE = Non-drive end
Figure 8.1 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.
Drain
17.
Retainer
Before disassembling the motor:
1.
Disconnect the supply pipes of the cooling water and place the motor in horizontal position;
2.
Disconnect the electrical wiring from motor and accessories;
3.
Remove 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.
8.1.1
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 the item 7.10.9.1;
3.
Disassemble the NDE bearing (8) and the motor NDE end
shield (5), as described in item 7.10.9.2 ;
4.
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.
NOTES
The bearing temperature sensors are removed
together with the motor end shields. To remove
them, it is necessary to loosen the clamps that
fasten the sensor connection cables to the
motor inside and disconnect them from the
terminals in the terminal box.
8.1.2
Assembly
To assembly the motor:
1.
Using a suitable device, place the rotor (11) inside the
stator (12), inserting it Through the motor DE side,
taking care that the rotor does not drag against the stator
core or on the coil heads;
2.
Assemble the DE bearing (6) and the motor DE end
shield (4), following the procedure in item 7.10.9.5;
3.
Assemble the NDE bearing (9) 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 ground brush (if any);
7.
Fill the bearing grease through DE and NDE grease
fittings.
