There are two methods of altering the power of an air motor: Throttling or pressure regulation. The best approach depends on the conditions of the individual application.
When selecting an air motor for a specific application, the first step is to establish the 'working point'. This is the combination of the desired operating speed for the motor and the torque required at that point.
The free speed and torque can be reduced by up to half on Chicago Pneumatic motors. The air motor can be operated at any point in the color-coded area
The free speed and torque can be reduced by up to half on Chicago Pneumatic motors. The air motor can be operated at any point in the color-coded area
Throttling
Throttling is synonymous with air flow control and affects speed more than torque.
A throttle valve is normally installed in the air inlet of the motor, although it can also be installed at the air outlet. The advantage of throttling at the inlet is the reduction in compressed air consumption. A slightly higher starting torque remains when the outlet is throttled. If the motor speed is to be lowered while maintaining the maximum starting torque, throttling is the best way to change the motor power.
Air supply reduction
Air exhaust reduction
Reduces speed
Reduces speed
Decrease air consumption
Keeps a good starting torque
Reduces starting torque
Keeps stability
May impact functioning stability
Pressure regulation
If a pressure regulator is used, it is always fitted into the air inlet of the motor. A pressure regulator is suitable if the stall torque is to be changed but a high starting torque is less important.
Motor performance with other air pressures
All power curves for Chicago Pneumatic air motors have an input pressure of 6.3 bar. For other pressures, the power curves must be recalculated. To do this, the motor data at 6.3 bar must be multiplied by a correction factor. This factor is shown on the right in table 1.
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