Thrust Measurements 2.0
Posted: Fri Apr 10, 2015 7:12 am
As promised I measured the thrust of the Crazyflie Motor + Propeller with kind of a professional equipment.
I used the PX4 (https://pixhawk.org) to send PWM signals to the Motor Controller DRV8850EVM (http://www.ti.com/tool/drv8850evm) and measure the thrust with a force torque sensor ATI Mini40 (http://www.ati-ia.com/products/ft/ft_mo ... ?id=Mini40) with 0.5g resolution. The current is measured using a a current probe and a data acquisition board (http://sine.ni.com/nips/cds/view/p/lang/de/nid/203867). The power comes from a power supply set to 3.7V and can deliver up to 5A (http://www.elv.ch/labornetzgeraet-nrp-2 ... 0-5-a.html).
I had only time to measure the replacement motor with one of the propellers, so it may probably be off a bit.
On the left side of the image you can see the results for the Crazyflie Propeller and on the right side for the Blade Nano Nano QX 3D (ordered here: http://shop.lindinger.at/product_info.p ... id=9716561).
However I think that my results are far too optimistic for the real system, since already for the measurements of Tobias I don't get enough trust and as already described by other users, the thrust depends massively on the status of the battery.
The results from Tobias can be found here: http://wiki.bitcraze.se/misc:investigations:thrust
I used the PX4 (https://pixhawk.org) to send PWM signals to the Motor Controller DRV8850EVM (http://www.ti.com/tool/drv8850evm) and measure the thrust with a force torque sensor ATI Mini40 (http://www.ati-ia.com/products/ft/ft_mo ... ?id=Mini40) with 0.5g resolution. The current is measured using a a current probe and a data acquisition board (http://sine.ni.com/nips/cds/view/p/lang/de/nid/203867). The power comes from a power supply set to 3.7V and can deliver up to 5A (http://www.elv.ch/labornetzgeraet-nrp-2 ... 0-5-a.html).
I had only time to measure the replacement motor with one of the propellers, so it may probably be off a bit.
On the left side of the image you can see the results for the Crazyflie Propeller and on the right side for the Blade Nano Nano QX 3D (ordered here: http://shop.lindinger.at/product_info.p ... id=9716561).
However I think that my results are far too optimistic for the real system, since already for the measurements of Tobias I don't get enough trust and as already described by other users, the thrust depends massively on the status of the battery.
The results from Tobias can be found here: http://wiki.bitcraze.se/misc:investigations:thrust