Specifications

K5
Parker Hannifin Corporation
Pneumatic Division
Wadsworth, Ohio
www.parker.com/pneumatics
Pneumatic Actuator Products
Air Motors
Air
Motors
K
Catalog 0900P-E
Technical Information
All catalog data and curves are specified at a supply pressure of 6 bar
(in the inlet port). This diagram shows the effect of pressure on speed,
torque, power and air consumption.
Start off on the curve at the pressure used and then look up to the
lines for power, torque, air consumption or speed. Read off the
correction factor on the Y axis for each curve and multiply this by the
specified catalog data in the table or data read from the torque and
power graphs.
Example: at 4 bar supply pressure, the power is only
0,55 x power at 6 bar supply pressure.
This example shows how rapidly the power rating of a motor
decreases as the supply pressure is reduced. Therefore, it is critical
to ensure that the proper pressure is supplied at the inlet port of the
motor.
Direction of Motor Rotation
The direction of rotation of reversible motors is controlled by supplying
inlet L or inlet R with compressed air. Air motors can be stopped and
started continually without damage.
The most common way to reduce the speed of a motor is to install
a flow control in the air inlet. When the motor is used in applications
where it must reverse and it is necessary to restrict the speed in both
directions, flow controls with integral non-return function should be
used in both directions. Restriction may also be applied to the main
outlet which will control the speed in both directions.
Inlet Throttling
If the inlet air is restricted, the air supply is restricted and the free
speed of the motor falls, but there is full pressure on the vanes at
low speeds. This means full torque is available from the motor at low
speed, despite the low air flow.
Since the torque curve becomes “steeper”, this also means that we get
a lower torque at any given speed than would be developed at full air
flow.
Pressure Regulation
The speed and torque can also be regulated by installing a pressure
regulator in the inlet pipe. When the motor is constantly supplied
with air at lower pressure and the motor is braked, it develops a lower
torque on the output shaft.
In brief: Inlet throttling gives reduced speed in one direction but
maintains torque when braked. The torque curve becomes steeper. A
restriction in the main inlet gives reduced speed in both directions but
maintains torque when braked. The torque curve becomes steeper.
Pressure regulation in the inlet cuts torque when the motor is braked,
and also reduces speed. The torque curve is moved parallel.
P = power Q = air consumption
M = torque n = speed
Speed Regulation
Throttling
Supply throttling,
nonreversible motor.
Outlet throttling.
Supply throttling,
reversible motor.
Pressure regulation at
motor inlet.
Correction Diagram
n = f (p)
p [bar]
Q = f (p)
M = f (p)
P = f (p)
0,4
0,3
0,5
0,6
0,7
0,8
0,9
1,0
1,1
1,2
1,3
3 4 5 6 7
Correction Factor
M
M
Torque curve
change caused by
throttling.
Torque curve
change caused by
pressure change.
As the motor begins to rotate air is trapped between the vanes and is
compressed. This air is exhausted through the exhaust port. As the
rotor continues it’s rotation, trapped air is compressed and exhausted
through the residual port. If this air is not exhausted, the motor will be
braked and maximum power will not be obtained.
Main outlet
Main outlet
Residual
outlet
Residual
outlet
Inlet, counter-
clock wise
Inlet,
clockwise