Atlas Copco Air Motors

Methods of modifying motor
output
Throttling
A throttle is usually fitted into the motor´s inlet hose, although
it can also be fitted into the exhaust hose. When it is
desirable to maintain a high starting torque but reduce running
speed – throttling is the best method of modifying the
motor´s output, Figure 5.
Torque
[Nm]
Pressure regulation
When using a pressure regulator it is mostly fitted into the
motor´s inlet hose. The use of pressure regulation is ideal
when control of the stall torque is required and a high starting
torque is not so important, Figure 6.
Torque
[%]
100
Par
[Nm]
Speed [r/min]
Operating pressure
7 bar
6 bar
5 bar
4 bar
3 bar
100
Speed [%]
Using the catalogue
Motor data, specification and performance
curves
Velocidad [r/min]
Figure 5
Figure 6
For each Atlas Copco motor/gear unit combination the following
information is presented in this catalogue.
1. Tabular Data – Summary of main performance
parameters.
2.Dimensional drawings.
3.Performance curves.
Notes on performance data
The performance data stated in this catalogue is valid for an
air supply pressure of 6.3 bar (91 psi), gauge. Air consumption
values are for free air delivery – (ie, the volume the consumed
air would occupy if allowed to expand to atmospheric
pressure).
The direction of rotation for a motor is always stated looking
from the back of the motor. Figure 7 illustrate clockwise rotation.
Figure 7
Understanding the performance curves
The output of an air motor is most clearly seen from its
performance curves Figure 8. For each motor/gear unit the
power, torque and air consumption are shown as a function
of speed.
The diagrams shown apply to an inlet pressure of 6.3 bar, to
calculate performance at other pressures refer to page 70 in
this catalogue.
Torque
[Nm]
Power
[kW]
Max
output
Torque
at max
output
Motor selection
Guidelines on motor selection are given on page 70 in this
catalogue – Choosing Your Motor.
Installation
Power
Torque
Air cons.
[l/s]
Air. cons.
Speed [r/min]
Note. The starting torque
produced by an air motor is
variable and depends on vane
position. These diagrams
do not indicate the starting
torque – this can be obtained
from data tables, where the
minimum value is shown.
Figure 8
General installation recommendations are given on page 72.
Details specific to a motor are shown in the section relevant
to that motor type.
AT L A S C O P C O A I R M O T O R S 7