14108242 Installation, operation and maintenance manual – Squirrel cage motor – WGM20 Line l 29
When a reduction or increase in speed is required, the belt
transmission is the most indicated.
In order to avoid unnecessary stress on the bearings, the
shafts and the pulleys must be perfectly aligned.
Belts that operate obliquely transmit alternating jolts to the
rotor and will be able to damage the bearings.
Belt slippage can be prevented by applying a resin like
material, such as pitch for instance.
The belt tension must be just enough to prevent slippage
during operation.
NOTE
Belts too tensioned increase the load on the
shaft end, causing vibration and fatigue, or
even the break of the shaft.
Avoid using too small pulleys, since they cause flexion of
the motor shaft because of the belt traction force that,
which increases as the diameter of the pulley decreases.
ATTENTION
Consult WEG for the correct sizing of the
pulley.
NOTE
Always use properly balanced pulleys. Avoid
extra key lengths, because they increase the
unbalancing mass and increase the motor
vibration.
