ImHereToCrash
First Officer
Flight distance : 5381368 ft
United States
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MARSAN Posted at 2017-9-8 01:32
It is much cheaper and easier to produce a square wave.
To produce a nice and useful sine wave, extra electronic circuitry is required, which will more than likely have to be added to the original Mavic aircraft, and certainly if you want to convert a digital to an analog signal.
If that digital to analog circuitry were already present in the original Mavic, then why didn't they use it right from the beginning?
well impossible to say how nice and clean that sine wave is...we need to see it on a scope first and torn down.. also cost is very small if done right shouldn't cost that much.
plus on top of all of this, i am the one that originally mentioned on this forum the use of sine waves based on the diagram and the logic that would be the easiest, most reliable way and since i have a background in electronic design, the current method is unfiltered square wave. the only filter is the motors which are acting as a variable inductance and thus as a very crude amplified speaker (similar to inductor whine but on a varied and amplified scale)... changing it to a sinewave means they can cancel out opposing noises on each side.. essentially running inverse 180 degree frequency of the opposing sides on the ESCs, not possible on unfiltered square wave.. but if dji is smart they only modify the current ESC, filtering it down and changing time division on input for each motor controlled....then just using fairly simple formula to cancel out the noise generated by each motor.. |
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