Hi! My current project involves creating and sending pulses of air down a 1 square inch tube. My idea is to oscillate a fin attached to a motor, and this "flapping" will create the desired pulses of air. I am looking for assistance in finding the appropriate motor, which satisfies the following requirements:
- 5-20 Hz frequency of oscillations
- Very accurate and repeatable motor-arm movement
- Resistance to displacement by external forces
- We are only pushing small volumes of air, so I doubt torque requirements will be very high.
I was playing around with the TowerPro SG90 9G Mini Servo that came with my Arduino Uno starter kit, but couldn't get it to reliably oscillate at a high enough frequency. Is a servo a good motor to use? I was looking online at some servos used in RC Helicopters as potentially applicable for my project. The HKS-9257 High Speed Servo 4.5kg/ 25g/ 0.07sec seems like it might work, but I am concerned with the precision of the servo movement, as I require a high tolerance on the volume of air displaced by my fan. Is this a valid concern?
Am I on the right track with looking at servos? Would a stepper motor be better for my application? Would a piezoelectric bimorph actuator be a good possibility?
Thanks for your help!