Possibly. I know it’s good for stopping outside magnetic fields interfering, but I wonder how good it is controlling its own magnetic field.
I went into a little rabbit hole yesterday wondering if there was some of kind of material that you could surround your wire with that has high reluctance. Fortunately or unfortunately depending on how you look at it, air is already amazing at resisting magnetic fields. Looking at magnetic reluctance on wiki there were only a few materials that were slightly better than air. One of them being . So submerging your set up will help .
But by the looks of it the best option is creating a competing magnetic field aka wrapping the two battery leads together. But another thought is. I wonder if these competing magnetic fields are actually draining power, as a result. Not sure, but something interesting to think about.
So I finally go a chance to measure the current and voltages between the battery and esc. I don’t have my own build yet, but I do have a really nice pre-built I put a current and voltage probe in between the battery and the esc. My plan was to measure this stock config then add about 1m of length of 12awg DC cable in between so I can see the effect of the increased inductance on the voltage. You know for science.
This was the scope measurement of the voltage and current when I blipped the throttle for about a half second. Of course the motors do not have much load as the wheels are in the air. The current ramps to about 80A in just about 100ms then drops to 10A. I guess this is just to get the wheels turning then there is not much current to sustain this. The voltage is measured as AC coupled as this makes it easier to just see the changes without the large 49.5V DC offset. It dropped about 5V during the peak of the current draw, then only rings up about 0.8V.
I minimized the increase of inductance by keeping ground and hot close, but really I was expecting a change in voltage spikes with the extra length of cable. I measured this because my first build will be a eMTB with a top mount battery pack and the esc over the top truck. It was brought up in another thread to watch out for inductance between the battery and esc. These results leaves me unconcerned about that cable that will run over the bindings.
What do you guys think? I could put the battery pack on an electronic load in my lab to run a longer pulse of current? Honestly, I don’t think it will be much different as we are already getting a huge 80A current spike. It’s the magnitude of that, plus the dI/dt over 100ms that would create a voltage spike with the inductance of battery plus cables and we already have that.
I am willing to test something else if you have some good ideas
Your time base is 200mS/div?
Change to one of the uS/div time base settings and fire another throttle blip, looking at the start and end. Keep the input bandwidth high.
A big issue is that the battery pack is great at filtering those spikes and the caps on the ESC‘s input are too. Best to measure at the input to the ESC though.
Do you think I’m missing some higher frequency action? It’s a giga sample scope running 10M points. I couldn’t see anymore detail when I zoomed in. Not sure I could capture a whole half second pulse with a 200us/div time base.
Here is the long cable test zoomed in to the front edge tek00004.bmp (2.3 MB)
I always like to do separate measurements (the start of your throttle blip and the end) rather than depending on zooming in. It takes more time but then there’s no wondering if the scope has caught all spikes or not.
You’re taking your measurements near the battery end of the wiring? Measure at the ESC end. That’s where it would be an issue, if a spike is there.
Also try pulling your leads apart as much as possible to increase the loop area and the inductance. It’s a good way to double-check your measurements. If you don’t see a change between tight short wiring and long spread out wiring then something might be interfering with recording the spikes.
Ya, I guess I forgot to move the voltage probe when I added the extra length… I will remeasure this when I get a chance and try to also increase the loop area.
. So submerging your set up will help 
.
I put a current and voltage probe in between the battery and the esc. My plan was to measure this stock config then add about 1m of length of 12awg DC cable in between so I can see the effect of the increased inductance on the voltage. You know for science.
