Authors: Noham Behe, Thomas Peeters, Mohamed Ben Tato, Dilan Sen
Date: 06/08/2020
GOAL
Two different types of bellows are used in the Breathney version 2 machines. A silicone version (shore 50) that was manufactured in-house using vacuum injection molding of a thermosetting silicone resin, and a version 3D-printed in TPU (shore 90).
The goal of this test is to measure the possible difference in power consumption for the 2 versions of the bellow.
SETUP
The current from the PSU to the main board is measured with a multi-meter (Meterman, model 37XR), seen in picture 2. This setup was done for different preset settings on the machine. The output voltage of the PSU is 24 V.
MEASUREMENTS
SETTINGS: No peep, RR: 35 BPM, PP = 45 cmH2O, I/E = 1:1, Ramp = 0.2
| Average Current (A) | Average Power (W) (U = 24V) | Peak Current (A) | |
| Silicone Bellows | 0.7 | 16.8 | 3.330 |
| 3D-printed Bellows | 0.95 | 22.8 | 7.3 |
SETTINGS: No peep, RR: 30 BPM, PP = 35 cmH2O, I/E = 1:1, Ramp = 0.2
| Average Current (A) | Average Power (W) (U = 24V) | Peak Current (A) | |
| Silicone Bellows | 0.6 | 14.4 | 3.197 |
| 3D-printed Bellows | 0.7 | 16.8 | 6.7 |
SETTINGS: No peep, RR: 35 BPM, PP = 55 cmH2O, I/E = 1:1, Ramp = 0.2
| Average Current (A) | Average Power (W) (U = 24V) | Peak Current (A) | |
| Silicone Bellows | 0.75 | 18 | 3.1 |
| 3D-printed Bellows | 1.1 | 26.4 | 7 |
CONCLUSION
The motor consumes on average 21% more power when using the 3D-printed bellows instead of the silicone bellows.
At higher pressure/faster motion settings the difference is more pronounced. Differences up to 45% were measured.
