ESC recommendations

[katch]

If thats the case then secondary fans maybe necessary to protect it, but they are only 50p

[katch]

have you got a thread running ? i have one title NEW HEAVY but i need to be less lazy and get more up.

Awesome katch sounds like a similar drive setup to my design.

I can't wait to see your build.

I'm planning to start after Easter.

[T00TY_FRU1TY]

I will once I have sourced all my remaining parts.

I'm with you on brushless but seems to complex to work with and a limited number is ESC choice.

Besides brushless motors are plentiful and cheap so can replace easily IMHO.

[typhoon_driver]

"If thats the case then secondary fans maybe necessary to protect it, but they are only 50p "

Those fans will also likely be nackered in the first hit from a heavyweight. I'm not saying this to be difficult, I'm trying to save you time, money and disappointment

[maddox10]

Fans in robotwars belong in the stands, not in the machines. Tried that. From the cheapest recycled computer fans, to the most sturdy industrial versions Pabst could deliver.
Shocks like our machines experience will destroy them in a decent fight.

[katch]

I can see its a valid point, but i've never actually seen a pc fan fail because it was knocked, but there are alternative fan designs. As i already have 2 of these cryton units its a good observation, and easily fixed with more than 1 fan or fan type or even a larger heat sink i guess, not looked at that as an option yet perhaps ?

"If thats the case then secondary fans maybe necessary to protect it, but they are only 50p "

Those fans will also likely be nackered in the first hit from a heavyweight. I'm not saying this to be difficult, I'm trying to save you time, money and disappointment

[T00TY_FRU1TY]

I have seen the robot claws similar spec and price (36v so no overvolting), the can bridge the motor terminals if more current needed.
No moving parts

[maddox10]

Have a go with fans. Please tell us the results.

I personaly won't use a fan in a robot wars machine.
Tried it a few times, failed miserably. Even with extensive shock mounting.

Had even the internal fan on a Bosch 750 fail ...That pressed steel shape started munching the windings... From then on I removed those.

[typhoon_driver]

If a fan experiences a shock of 500G (not unrealistic) it will fail. Go ask a fan manufacturer what shock load they will guarantee it to. Chances are they will say "none".

A knock, dropping a computer off a desk is very different to being inside a heavyweight flipped or smashed through the air.

Both Mario and I have decades of experience building in various weight classes and we are both saying the same thing. I'd heavily recommend taking our advice.

[Ocracoke]

Worth getting the controller, removing the top cover (seems to be held on with motherboard standoff screws), getting a passive CPU cooler and some thermal paste and putting that on the ESC? You could retain the fans as a secondary measure then.

[maddox10]

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.

[T00TY_FRU1TY]

How big a heat sink would be needed to replace 80mm fans?

[maddox10]

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

[team death]

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.

[katch]

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.

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.