Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
11
3.6.1.
Installation.
Field application of a coupling to the motor shaft should follow the
procedures recommended by the coupling manufacturer. Under no
circumstances may the motor shaft be modified as to configuration or
diameter without the approval of Teco Australia. The motor shaft extension
must not be subjected to either extreme heat or cold during coupling
installation. If it is necessary to exert axial force on the shaft, either
continuously or intermittently, during coupling application, it must be
properly restrained axially to prevent bearing damage.
3.6.2. After the motor has been properly aligned with the driven equipment and
the hold down bolts have been installed and tightened, at least two dowel
pins should be installed diagonally opposite motor feet.
3.6.3
Alignment.
In aligning the motor (and rotor) axially with the driven equipment,
consideration should be given to the axial shaft expansion and increase in
shaft centre line height due to thermal effects.
Shaft height growth (change in shaft centre line elevation) for TEFC
machines can be calculated as follows,
Growth =(0.0005) x (motor foot to shaft centre line dimension [in mm]).
The exposed rotating parts should be covered to prevent accidents.
Motors must always be accurately aligned. Incorrect alignment can lead to
bearing failure, vibration and even shaft fracture. As soon as bearing
failure or vibration is detected, the alignment should be checked.
