3 ms·
Good idea using a large AC blower. I would think a small brand new or very clean wet dry shop, vac using the blower attachment might be even better. It would b
by sigmaprimus 7y ago
Good idea using a large AC blower. I would think a small brand new or very clean wet dry shop, vac using the blower attachment might be even better.
It would be noisy but would allow the design to incorporate negative pressure of the vacuum side to assist with exhaling.
Maybe the shop vac could be plugged into a speed controller to improve duty cycle and reduce noise but controlling an AC motors speed is quite a bit more complicated(expensive) than controlling a DC one.
- mhb 7y agoWhat about using an air compressor? These should still be readily available and is an off-the-shelf air pressure solution. The air couldn't be used directly (oil in it) - there would need to be an isolation bellows or something similar.
- sigmaprimus 7y agoThats a good idea too, and they do make oil-less compressors they are typically smaller but years ago I came across many of these attached to dry sprinkler systems in small parkades.
- bacon_waffle 7y ago> It would be noisy... > controlling an AC motors speed is quite a bit more complicated(expensive) than controlling a DC one. That type of motor is so noisy because it's a universal motor[1] - they can be controlled with light dimmer type circuit[2], but they're basically always noisy and inefficient. A cordless drill would be a good starting point for a variable speed power train. [1] https://en.wikipedia.org/wiki/Universal_motor https://en.wikipedia.org/wiki/Universal_motor [2] If you're actually using a light dimmer to control a universal motor, use the highest current rated dimmer possible. The motor will be more inductive than the typical lighting circuit that the dimmer is designed for.