Mounting Features; Frame; Main Stator; Main Rotor - WEG G truck Serie Manual De Instalación, Operación Y Mantenimiento

4 MOUNTING FEATURES

4.1 FRAME

The frame has robust corrosion resistant cast iron
construction with external fins, designed to provide
maximum cooling.

4.2 MAIN STATOR

Its core is made up of magnetic steel sheets heat treated
to minimize the iron losses.
The winding consists of a layer of concentric coils and full
pitch with insulation class H (180°C) and fixed by
insulating closure wedge.

4.3 MAIN ROTOR

The poles are salient and accommodate the field winding
fixed by shims so that they can resist the centrifugal
force.
The series winding of poles is performed with rectangular
wire insulation class H, and connected with six rotating
diodes.

4.4 EXCITER STATOR

It consists of laminated plates and fixed to the frame by a
1020 steel clamping ring on the non-drive end.
The poles accommodate a winding whose terminals are
connected to the truck battery.

4.5 EXCITER ROTOR

The main exciter rotor is mounted on the shaft of the
main machine.
The rotor is laminated, and their slots shelter a three-
phase winding with star connection. From each point of
the star connection two wires come out to the rotating
rectifiers, where one is connected to the rectifier on the
positive support and the other on the negative support.

4.6 TERMINAL BOX

The cast iron terminal box is located on the side of the
frame, and accommodates the load terminals, neutral
and excitation terminals.

4.7 BEARINGS

GSK alternators are equipped with ball bearings with
permanent lubrication, whose characteristics are
indicated in the table below:
Rolling bearing
Side
type
DE 6309 ZZ
NDE 6207 ZZ

4.8 COOLING

GSK alternator is self-ventilated type equipped with an
axial fan mounted on the shaft on the non-drive end
which is protected by a cover made of cast iron with a
large area of suction guiding the air over the finned frame.

4.9 DIRECTION OF ROTATION

The GSK alternator can run in both rotation directions,
but the phase sequence is set to clockwise rotation
(facing the shaft end of the alternator - Drive End). In
accordance with VDE 0530 standards, the alternator
terminals are marked in such a way that the sequence of
the terminals 1, 2 and 3 (R, S and T) matches the phase
sequence, when the rotation is clockwise.
In the case of alternators that need to operate in the
counterclockwise direction, the phase sequence must be
changed (if required). It is recommended to check the
direction of rotation and phase sequence required before
the start-up of the alternator.
Estimated
useful life
(hours)
20000
20000
10258257 – Installation, Operation and Maintenance Manual
www.weg.net
ATTENTION
The wrong sequence of phases can cause
damage to machines to the alternator as well
as serious problems in synchronization
attempt with another alternator or network.
l 15