Air motors differ in many ways from other power sources. These unique operating characteristics must be considered when selecting an air motor for a particular job. It is easy to change horsepower and speed of an air motor by throttling the air inlet.
Therefore, the best rule of thumb for selecting an air motor is to choose one that will provide the horsepower and torque needed using only two-thirds (2/3) of the line pressure available. The full airline pressure will then be available for overloads and starting.
Torque vs. Speed
- An air motor slows down when load increases… at the same time, its torque increases to a point where it matches the load. It will continue to provide increased torque all the way to the stalled condition, and it can maintain the stalled condition without any harm to the motor.
- As the load is reduced, an air motor will increase speed and the torque will decrease to match the reduced load.
- When the load on an air motor is either increased or decreased, speed can be controlled by increasing or decreasing air pressure.
- Starting torque of an air motor is lower than running torque. While this provides smooth, low-shock starting, it is necessary to have additional airline pressure for starting under heavy loads.
Air Consumption vs. Speed
Air consumption increases as speed and air pressure is increased.
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