Hey Tucker did you notice bushing deformation with your flat bushing setup?
I’m thinking I should put bushings on the outside of the heim…
Hmm maybe that won’t work aswell as I thought it would.
maybe it would work better if the flat washer inner diameter was big enough to not touch the ball in the heim but had an overall diameter that would prevent the bushing for going over the lip of the washer.
it could help with bushing deformation.
Yup. Feature, not a bug.
Let’s the board lean more before hitting the limit of bushing compression
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As someone with a 50lb(ish) v5, I do wish it was a little lighter😂
I really notice the difference when riding lighter boards(like Nothing Fancy). A lighter board makes it much more “throwable”.
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Custom collar for custom motor mounts that I will have made soon
The six holes on the side will be threaded.
Aswell as the main axles hole and the three holes on top.
The idea is that those three holes are utilized for securing the collar and the radius rod.
This collar should have superb retention as far as handling shock load.
2 holes will be taken up by grub screws and 1 hole for the radius rod. What’s cool is it allows for different angle of the radius rod. Not sure if it will have an effect on how the board reacts but should be interesting to play around with.
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So are the losses limited to electronic frequency losses? … can vibration play a part in altering these frequencies?
Is there any way to decrease minimize the lag from hysteresis loss?
Is there anyway you can elaborate on the mosfets switching characteristics having an effect on hysteresis loss? I’m curious whether you can get more out of the same controller utilizing a different firmware potentially making the mosfets act differently…
I’m trying to understand what’s causing this inefficiency… is crosstalk disturbance relevant from the high current draw / output?
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These questions are above my knowledge level but one example for mosfet efficiency is that fets don’t turn on and off instantly, it takes some time to charge and discharge the gate which has a capacitance and thats why you want powerful gate drivers, to reduce the switching time.
When the fet is turning on or off, it crosses through the non linear region of on resistance, meaning it turns into a heater in that region. A good fet coupled with good gate drivers minimises this effect.
Electronics are very complicated and you can still fuck it up with good parts, for example having long circuit traces between the gate driver and the fet can cause oscillations as the gate charges due the circuit trace itself having capacitance.
I’m not sure how much of a part these aspects contribute to overall efficiency but all motor simulation software packages include inverter switching simulation for more accurate efficiency and performance calculations. The frequency and noise coming from the fets can cause harmonics in the motor that reduce efficiency for example.
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What motor simulation programs do you utilize? I’m curious about designing my own motor & maybe even my own controller to diffuse the disconnect / losses between motor & controller.
Its very complicated, but having a go and playing with sim software is a great way to learn.
MotorXP-PM has a free trail and is quite user friendly so I’d suggest starting there.
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Smaller quirks.
I bought x4 carbon steel shaft colllars, drilled and tapped all of them. Using USA made drill bits and taps makes it 3000 times easier holy hell.
After that I loctited the hell out of them & also bought beefier radius rod nuts.
Should hold up for awhile I hope this is the last time I’ll be taking it apart since I’m gonna be moving in the near future.
More updates in the future but for now i must get on the track, maybe I’ll finish up that active cooling project I had going on. But since it’s cooling off temperature wise I’m kinda slacking on it.
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This blows me away… do you mean it builds resistance from being to long? I don’t understand how a trace can have capacitance.
Does having a cooling air cooling system cooling the mosfets help prevent inefficiency from heat build up? Or is it just better to have stronger fets?
Any and every electrical component(including wiring and traces) has parasitic capacitance, resistance, inductance, etc.
Just depends on your application if you need to worry about it.
Great examples are digital communication and antenna RF routing, where you need to impedance-match all your PCB traces and wiring.
This is a fantastic video that dives deeper into the concept.
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straying off topic.
side note, a ton of the metaphors we use are less right than we think. 
so there’s always more to learn.
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And I used to think that the energy in the circuit was in the voltage and current, but it’s not. The energy in the circuit is in the fields. The most important thing you need to know is that when you route a trace, you better define the other side of that transmission line,
– rick hartly circuit board designer at 21:30 in the above YT vid.
P.S. I’ve ridden an electric skateboard through that spot they are doing the experiment.
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Ha!
Same guy that posted the video I posted above actually set up the thought experiment that veritasium proposed. TLDR Veritasium is technically right but also wrong
Second best alphapheonix video imo
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