Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
5.3.2. Main causes of high temperature:
a. Motor Conditions
i. Voltage and frequency variation of power source is in excess of
tolerance.
ii. Unbalanced three phase voltage, open circuit or poor contact.
iii. Insufficient or excessive lubrication.
iv. Abnormal frequency of starts.
v. Single-phasing due to open circuit or short circuit.
vi. Damaged starter or improper operation.
vii. Blocked ventilation ducts.
viii. Motors cooling vents blocked.
b. Due to load or mechanical conditions:
i. Overload.
ii. Defective transmission coupling.
iii. Poor installation causing overload.
iv. High ambient temperature or radiant heat emitted from driven load
or surroundings.
5.4. VIBRATION.
5.4.1. Main causes inducing vibration:
i. Unbalanced load.
i. Misalignment of couplings.
ii. Unbalanced belt-sheaves.
iii. Improper couplings with belts or chains.
iv. Unsuitable foundation or poor installation.
v. Unbalanced motor rotor.
vi. Serious abrasion to motor or load machine drive bearing.
vii. Defective bearing or subsequent bearing damage.
5.4.2. No matter what causes the vibration, if it is not eliminated, the following
faults may develop:
i. Bearing damage.
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