šŸ–¼ Reply to ā€œPictures and nothing elseā€ thread_2020_summer

Charger has small static pre-charge, contactor(PMU) is on battery/BMS side.
Contactor clicks->pilot signal (basically just an I/O) to charger from BMS->charger ramps up voltage.

2 Likes

You think you quoted them enough?

2 Likes

Nope :man_facepalming:

5 Likes

Thatā€™ll buff out.

10 Likes

@rafaelinmissouri, how did you manage that?

2 Likes

Did you try turning it off and then on again?

8 Likes

Nah. Jbweld it. Its fine.

2 Likes

I donā€™t even think you need that, probably just butyl tape

3 Likes

no clue dude.
I have had these motors a while and in a few different set upsā€¦ but they were in pretty good shapeā€¦ I recently put them on the Khymera which is a belt driveā€¦ I run the belts pretty loose.

I went for a ride Tuesday at lunch time and 6 miles in I hear weird noises and eventually see the motor being weirdā€¦ I thought I blew out a bearingā€¦

rhe universe new I really wanted BN 6384s on this board anywaysā€¦

2 Likes

Iā€™m surprised we havenā€™t seen a single goth zenith yet

5 Likes

Goth board gang xD

3 Likes

I wonder whatā€™s the darkest board you can make, no silver anywhere

Can you get black axles and bearings?

3 Likes

Vantablack everythanggggg.
Heat would be problematic.
I for one absolutely love dark mirror finish, maybe with some red or purple details, and spiked axel nuts.
Black bearings exist. Bushings can be dyedā€¦ ive got black wood stain and quartz sand on deckā€¦ now how do we color the axels themselves?

yes Trapstarļ¼ŒThe outer shell is carbon fiber

1 Like

paint it in vantablack

1 Like

Gang gang.

2 Likes

Vantablack is an incredibly efficient ā€œblackbody radiatorā€ (infrared) and can easily shed itself of any (tiny) heating due to visible light absorption. In fact, Vantablack is so efficient that using it could result in a slightly lower overall temperature for whatever it is coating as long as that heat has somewhere to go.

5 Likes

Nice! I actually didnt know that, but its interesting.

4 Likes

So all heatsinks should be vantablack for efficiency?

An unnecessary expense IMHO. Just any flat paint or anodizing (doesnā€™t need to be black) can increase the terrible IR-emitting efficiency of a metal. But if the heat is just radiated onto other nearby things in an enclosure then youā€™re not doing much overall.

And if the heat sink has fins that are ā€œfacingā€ each other than each finā€™s IR emissions will just be absorbed by the nearby fin. The shape of the heat sink is very important as radiative (infrared), convective (airflow, fan cooling), and conductive (connected to other metal) cooling all need a different shape/configuration for the heat sink.

The percentage of cooling possible via radiated heat loss, versus the other methods, might not be very high as it all depends on the setup. A polished metal heat sink will be lousy at cooling via radiation (emitting IR) but in lots of air flow it will be very effective at cooling via convection.

3 Likes