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Alignment And Coupling - GE Pegasus MHV GEEP-427-I Instuctions

Horizontal induction motor totally enclosed water-to-air cooled sleeve bearing
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Alignment and Coupling

General
Machines with sleeve bearings are adjusted at
the factory to have approximately 1/2-inch total end play
(4-pole generators have 3/4-inch total end play), with
approximately 1/4-inch end play either way from
magnetic center. The magnetic center and end play limits
are marked on the shaft by a series of three dots. The
rotor will run on magnetic center with approximately
1/4-inch end play in either direction. Sleeve bearings are
not designed to carry any external load thrust.
Accordingly,
limited
recommended for all units with sleeve bearings.
SHAFT POSITION
Shaft ends together
Shaft ends apart
Shaft ends together
Shaft ends apart
10
GE Energy Motors GEEP-427-I
end-float
couplings
MACHINE END PLAY
1/2
1/2
3/4
3/4
Table 1 Recommended clearances
Fig. 1. Shaft arrangement for limited end-float coupling
GEEP-427-I Pegasus, Horizontal Induction Motor
A limited end-float coupling permits relative but
controlled axial movement between the adjacent ends of
two shafts. This movement should be limited (value of
2xC in the table and Fig. 1. below) to be less than the
axial clearance of the AC Machine bearing (value of A +
B in Fig. 1. below), so that the limited, end-float
coupling performs its function. When the correct
alignment is implemented, the coupling prevents the
shaft shoulders on the inboard end of each journal from
exerting thrust on the corresponding bearing. The
recommended clearances in inches for limited, end-float
are
couplings are given in table 1.
__A__
5/32
11/32
5/16
7/16
Parallel and Angular Alignment for
Flexible Couplings
Copyright 2009, The General Electric Company, USA
TEWAC, Sleeve Bearing
__B__
__C__
11/32
3/32
5/32
0
7/16
3/16
5/16
0

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