Question: Calculate operating requirements of pneumatic motors.
1. A rotary vane motor with a displacement of 3 in3/rev operates at 1500 rpm. Supply line pressure at the motor inlet is 90 psi. Compute the free air consumption. (Assume no temperature change.) If the motor efficiency is 85%, estimate the power output (hp).
2. Supply line pressure at a motor inlet is 100 psi. The motor must deliver a peak starting torque of 280 lbf -in. Average torque requirement is estimated to be 210 lbf -in. Compute the displacement required and estimate the free air consumption if the operating speed is 1000 rpm. Stall torque and operating torque efficiency are 89%. You may neglect temperature change.