Electric motors




Electric motors are, by far, the most popular type of prime movers for rotating
equipment such as pumps. Compared to other types of drivers such as gasoline
engines, diesel engines, steam turbines, gas turbines, etc., electric motors are
easy to operate, inexpensive, highly efficient, quiet, available in more horsepower
(HP) sizes, and environmentally friendly. They are also available in a variety of
enclosures - such as open-drip proof (ODP), weather resistant, totally enclosed
fan-cooled (TEFC), or explosion proof - for different environmental conditions.
They are also available in standardized frame size so that one brand of electric
motor can be replaced easily with another brand. Electric motor-driven equipment
are ideal for installation in remotely controlled stations that are located in far-flung
areas.

The main disadvantages of using electric motors is their constant speed, and
their limited speed availability, which curtail the range of speed by which the driven
equipment can operate. They can be used only in places where electricity is
available, and sometimes commercial power companies in small communities
put a limit to the maximum electric motor size that can draw power from the utility
station so as not to affect adversely the power usage of other customers.

Electric motors are available for both horizontal and vertical mounting - in solid or
hollow shaft configuration. They can be supplied with extended shaft, or double-
extended shaft  for special applications.


R: 0210-ELMO
C: design, operation
F: electric motors




Related topic:

Electric motor power usage
How to select the right motor size (HP) to drive a pump
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