Submersible motor use in municipal systems is not new. The
advantages of submersible motors are well known to this
industry. Since these motors are placed deep into the earth, in
a relatively stable environment, they are immune to the weather
and environmental factors that plague hollow shaft motors
driving conventional line shaft turbines (LSTs). Submersible
motors and pumps eliminate the drive shaft and bearing systems
of LSTs, thus reducing the mechanical complexity and required
maintenance. Oil does not drip into the well for bearing
lubrication. Wells can be located adjacent to housing areas.
Submersibles also do not require structures to enclose them and
do not produce surface noise. Standard water well types of
submersible motors are water (water/glycol) filled and rely on
water as the internal lubrication for the motor. These motors
are extremely reliable when applied within their design limits
of temperature, hydraulic loading and power requirements.
Typical agricultural, domestic and municipal syste