The goal was to build a BLCD Motor Test-Stand to measure how electric current and buoyancy are changing on several different motor propeller combinations. The motor/props tests are mainly focused for usage with Quadrocopter like vehicles. Furthermore Amir (Godfather of Quadrocopters)
came up with the idea to measure the Tau63 for the PT1 transmission behavior.
With DAQmx you can set up your measurement hardware very easily (see next snippet).
Measured signals are:
Sampling rate = 10kHz
- BLC- Ctrl. Phase 1
- BLC- Ctrl. Phase 2
- BLC- Ctrl. Phase 3
- motor speed with optical sensor
- power input
- command acknowledge from BLDC-Controller
- voltage supply
For the measure of the buoyancy force we use a weighing machine 🙂 (see gallery)
To measure the motor/prop. speed we used two different measuring methods.
1. Laser module and a photodiode:
As you could see in the circuit diagram it is very high sophisticated 🙂
2. Via Back EMF (back electromotive force)
Back EMF is the voltage that pushes against the current which induces it. This voltage can be used to measure the motor speed.
Some Results for the electric current versus buoyancy measurements:
Some Results for the Tau63 measurements:
Last but not least, Ladies and Gentleman let me introduce you the Test-Stand itself 🙂