Passive cooling is better than fans.
But if you add a heatsink, look it at the other way around. Add the ESC to the heatsink.
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Passive cooling is better than fans.
But if you add a heatsink, look it at the other way around. Add the ESC to the heatsink.
How big a heat sink would be needed to replace 80mm fans?
Depends on surface area and total mass. Color and material are also nice to know.
For our application black anodised aluminium is the best option.
https://www.aliexpress.com/wholesale...hText=heatsink
But to give you an idea. In the Sidewinder , the heatsink was 2 smallish ali blocks bolted to the ali casing.
http://www.robotpower.com/products/sidewinder_info.html
It's interesting that experienced Roboteers are against fan cooled
ESC's and there are more expensive fan cooled ESC's on the market
uk/vyper-120a-dc-motor-controller.html at £200 + so I guess they
are not fit for purpose either?.
Whats most intriguing is that team Katch have a heavyweight Robot
up and running/ driving around with a relatively cheap ESC and unlike
myself-it didn't go bang when they plugged it in (different ESC ) and
also you have to applaud the testing at higher voltages.
And if you do requests can you try on 2 lipo 4s in series perhaps trying
to tow a car-I can loan you the batteries and if it's ok with this, mine
will be on order the next day.
Quote:
Originally Posted by team death
I think they have enough experience to be openly concerned for other builders. Who have not yet put up cash..
I on the other hand already spent the cash so I do need to overcome the potential issues so help is more useful now.
The offer for lipo is cool . what area are you in Colin.
The Vyper uses a actual heatsink where the Cytron just blows onto the mosfets.Quote:
Originally Posted by team death
I also believe the Vyper has bean used in combat bots both into the US and UK. (I might incorrect on this)
Thank's for the info on the vyper Mark, but it's still a fan cooler
so I assume it's vunerable to Combat impacts.
I have just noticed your location down in somerset there Team
Katch (member first name required) -I'm up north of York so
popping round with the lipos may be impracticable but I'm
very interested in this controller.
What is the highest voltage you have put into the ESC and
do you have any issues with sparking when you connect to batteries ?
I am sure Foxic uses them when I last saw the robot, so definitely in the UK at the very least.Quote:
I also believe the Vyper has bean used in combat bots both into the US and UK. (I might incorrect on this)
48v was tried esc was fine but motors didn' like it... I'll try my lipo when they arriveQuote:
Originally Posted by team death
The fans on the Vyper (and Victors ) still are vurnable.
Some of the ESC's have them to boost performance further (increased running time with heavy loads), others just use them as a pure replacement for a heatsink.
The "pure" heatsink replacements ain't good in my opinion. Already to much to go wrong in our machines, we shouldn't add more.
Out of curiosity are there any brushless ESC that are commonly used or are they all custom? Again all I can find are scooter or hobby controllers.I have my brushed motors already and have no experience with brushless but these motors look interesting.https://rover.ebay.com/rover/0/0/0?m...2F232169152820
I wouldn't consider brushless until you are a robot or two into the hobby.
Depends on weightclass. But brushless drives are finicky beasts. Gearratio is much more important than with brushed motors.
In our raptor we use SimonK programmed Afro 30's for drive. Drive itself is a set of Neptunes coupled with 28mm 2840KV diameter inrunners
In Hannibalito 5 we have, again, a set of Neptunes, but coupled with a pair of 1500KV 3650 inrunners and SimonK TZ85A's.
One heavy I know off uses 100mm diameter brushless outrunners and MGM Compro ESC's. (think big ££££)
Bananaking, a Russian monster, uses Revolt outrunners , but the Alienpower ESC's they tried burned out. VESC's had more succes, but can't get the power the machine needs. (one of the reasons I'm following the 300A VESC thread)
I noticed Ellis had major reliability issues using brushless in series 9.
If he had trouble I'm definitely staying clear anyways.
Looking at those motors, brushless or not, I wouldent be keen on them
purely because of the size of the drive sprocket at the end-it looks like
its rigged for 6mm chain or less and could be a true reflection of the power
of the motor-48 volt and 2000 watt driving 6mm chain, very questionable.
Most of those Chinese motors are t8f sprockets 8mm so use #40 chain
I'd just like to thank everyone for all the advice and points of view in this thread.
Very useful
Any idea what kinda current those things draw? They seem to vary between 6kW (120A @ 12s) and 15kW (300A @ 12s). The A200S can do 200A for 30s then 135A continuous so far.Quote:
Originally Posted by maddox10
I guess peaks will be what Revolt gives. But with current limiting everything has some measure of protection.
In any case, I'm very interested in your work.
Supporting bananaking and building a E-motorbike are 2 things I could use a good V-ESC for.