Teco Installation and Maintenance Manual
TEFC Squirrel Cage Induction Motors
Teco Electric and Machinery Company
Manual Number: IOM ~ TEFC Rev.01
ii. Vacuum – Recommended for wound rotor/slip ring type.
Vacuum cleaning can be used, both before and after other methods of
cleaning, to remove loose dirt and debris. It is a very effective way to
remove loose surface contamination from the winding. Vacuum cleaning
tools should be non-metallic to avoid any damage to the winding insulation.
iii. Wiping.
Surface contamination on the winding can be removed using a soft, lint-free
cloth. If the contamination is oily, the cloth can moistened (not dripping
wet) with a safety type petroleum solvent. In hazardous locations, a solvent
such as inhibited methyl chloroform may be used, but must be used
sparingly and immediately removed. While this solvent is non-flammable
under ordinary conditions, it is toxic and proper health and safety
precautions should be followed while using it.
6.1.5. Clean the exterior of the motor.
a. The inlet air openings should not be allowed to accumulate any dirt,
dust, slurry, lint, etc. that could restrict free air movement.
b. Totally enclosed fan cooled motors require special cleaning
consideration. The external fan must be cleaned thoroughly since any
dirt build up not removed can lead to balance issues and vibration.
Solvents of any type should never be used on windings provided with
abrasion protection. Abrasion protection is a grey, rubber-like coating
applied to the winding end-turns.
Adequate ventilation must always be provided in any area where solvents
are being used to avoid the danger of fire, explosion or health hazards. In
confined areas (such as pits), each operator should be provided with an air
line respirator, a hose mask, or self-contained breathing apparatus.
Operators should wear goggles, aprons and suitable gloves. Solvents and
their vapours should never be exposed to open flames or sparks and
should always be stored in approved safety containers.
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