Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
13
3.6.7 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.
3.7.
INSTALLATION FOR BELT DRIVE
3.7.1.
Small, medium and large motors within frame sizes up to and including 315
frame are designed for use with belt transmission or direct coupling.
3.7.2.
The diameter ratio between conveyance sheaves should not be greater 5 to
1 for flat belts, and 8 to 1 for V-belts. It is also advisable to limit the belt
velocity to under 35m/sec to limit belt abrasion and vibration. The smaller
the outer diameter of the V-belt sheave, the greater the shaft bending
stress will be. If bending stress is in excess of the shaft fatigue stress, the
shaft may break. If concerned please inform TECO of the size of the
sheaves and belt details for checking.
3.8.
ELECTRICAL CONNECTIONS
3.8.1.
The rated conditions of operation for the motors are as shown by the
nameplate. Within the limits given below, of voltage and frequency variation
from the nameplate values, the motor will continue to operate but with
Place the sheave and belt as close as possible to the motor body and
shaft shoulder to reduce the bending moment and improve shaft life.
Do not hammer the conveyance devices such as coupling, belt sheaves, chain
wheels, gears, pulleys etc. onto the motor shaft. Those shaft fitments should
be fitted and removed only by means of suitable devices. Heat shrinking may
be a better alternative to avoid damaging bearings and other components.
