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Choose your air motor in three steps - Step 3 Ascertain the necessary power of an air motor

Marie-Charlotte Messier
by Marie-Charlotte Messier on May 24, 2019 10:03:11 AM

Air motors, unlike electric motors, do not need to be oversized to achieve a certain power. First, because there is no risk of overheating, and also because the displayed power of the air motor is the real power available (which is not the case of his electric motor which always displays a power higher than its useful power).

How to choose the power of your air motor?

3# Ascertain the necessary power of an air motor


-> RETURN TO STEP 1: Determine the operating environment of the motor                            

->RETURN TO STEP 2: Determine the torque of its pneumatic motor

3 information must be taken into account:

1. Air pressure and flow rate

In order to determine the attainable power of an air motor, the pressure and available air flow rate must be taken into account. Air motors need a pressure of 3 to 6 bar and their power obviously depends on it.

2. The torque required for the application (T)

As seen above, the necessary torque depends on the application and is usually an external factor to be taken into account. Knowing the value of the torque required for your application is essential to choose the right air motor, the first thing to consider is the type of work that will be required of the motor.

3. The desired speed (S)

At what speed do we want our engine to run in a "normal" context, in other words with the nominal torque of the application, the defined pressure and excluding any particular constraints such as blockages or abnormal loads applied to the motor.

These 3 characteristics will determine the power required for the application. For a given pressure, power is the function of torque and speed by the following relationship where P is power in Watt, T is torque in Newton.meter and S is speed in revolutions per minute.

P = (C x V) / 9.55

Thanks to this equation, two quantities are sufficient to determine the third.

-> RETURN TO STEP 1: Determine the operating environment of the motor                            

->RETURN TO STEP 2: Determine the torque of its pneumatic motor

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