CALCULATING ROTATION SPEED (RPM)
BETWEEN MOTOR AND AIR PUMP
Diameter: 5 inches
Diameter: 10 inches
MOTOR
AIR PUMP
CALCULATING THE ROTATION SPEED OF AN AIR PUMP
What you need to know:
1º
2º
Pulley diameter
Motor rotation speed (Example: 1750 rpm)
Calculation Method:
1º
Rotation speed ratio (pulley ratio) is defined as follows:
The motor’s pulley diameter ÷ The air pump’s pulley diameter = 5 in. ÷ 10 in. = 0.5 in.
So, when the motor pulley has completed 1 full turn, the air pump’s pulley will have completed
only half a turn.
2º
Pump rotation speed is defined as follows:
1750 rpm (motor’s rotation speed) X 0.5 (pulleys’ ratio) = 875 rpm
CALCULATING THE MOTOR’S PULLEY DIAMETER REQUIRED FOR MAXIMUM
ROTATION SPEED OF AIR PUMP
You need to know:
1º
Air pump pulley’s diameter (Example: 12 1/2")
2º
Air pump’s maximum acceptable rotation speed (Example: 850 rpm)
3º
Motor’s maximum rotation speed (Example: 1750 rpm)
Calculation Method:
Motor’s pulley diameter = Air pump’s maximum acceptable rotation speed ÷ Motor’s rotation
speed X Diameter of air pump pulley
=
850 rpm ÷ 1750 rpm X 12 1/2" = 6"