|Air motors offer a unique set of advantage that make them the best power source
selection in certain tough applications. The following is adapted from the Gast catalog
and highlights some of the features that frequently indicate the selection of an air motor.
• Variable speed.
You can vary air motor speed between 300 and
10,000 rpm (depending on model selection) with a
simple valve put in between the air source and air
motor. Geared motors can be smoothly run down to
less than 10 rpm (depending on the model).
As a nonelectrical device, the possibility of explosion
from igniting flammable gases is greatly reduced.
A four-way valve in the air line enables a Gast Air
Motor to be instantly reversed. Activating the valve
causes a complete reversal of rotation, even when
the motor is running at full speed.
As the air motor turns, expanded air cools the motor.
Units can be used in ambient temperatures up to 250°
F (120°C) in a nonhazardous atmosphere.
•Compact and portable.
Get maximum horsepower with minimum size and
weight. A 4" diameter air motor with a body length of
less than 5" is producing 1.5 hp at 2000 RPM.
You can put a air motor in places where it will not get
much attention, because there’s virtually nothing to
service, providing it is operated on a clean, dry, and
lubricated air supply. (For even less maintenance,
NL series motors do not require lubrication.)
Air Motors can be stalled or overloaded for long
periods without any damage to the motor.
Cost is often less than other motors of equal
horsepower and capabilities.
•Operate in all positions.
Mount direct drive motors sideways, upside-down, or
in any position so long as adequate lubrication is
provided and end thrust is kept to design limits. (NL
series motors do not require lubrication.) Gearmotors
will operate in almost any position, see model data
Because air motors go to work with air-cushioned
smoothness, they cut stress on your equipment.
Vanes are self-sealing and automatically take up
their own wear, thus ensuring constant output for
thousands of hours of use.
Foot, hub, face, NEMA-C or metric flange motor
mountings are standard equipment for most air motor
•Four-vane or eight-vane.
Four-vane units meet most requirements, but for
more precise inching control and minimum blow-by in
applications where motor is frequently operating in a
stalled condition, specify eight-vane models.