How to cool down the controller ?

[Ebiker01]

My bike’s display (BH Easy motion) is able to show many parameters and controller temp. Is one of them.
As i often enjoy riding it fast (fast rpm over 75) i started checking out this setting and after 20-30min. Of hard/fast riding(25-29mph) , the temp. Reaches 50-51 degrees Celsius. This i noticed it happens no matter the temp. Outside. Maybe when is really cold (5, 0, or -10) it takes longer for the controller to reach those high temps but i haven’t really payed att. To this b/c i myself wAs too cold to think about it and check it out.
Mostly when i was riding at 5 degrees and up i was also investigating the controller temp. status.
So, what are high temps. For the controller , are 50-60C degrees okay in the long run ? And what ways would be possible to cool it down ?
Why aren’t they made with liquid cooled capabilities or fans inside ?? Or maybe other brands have this , i don’t know.

I usually stop and wait 10-15min., when it reaches 50C , then it goes down to about 37-39C.
2 ways i want to try :
- Co2 cartridges applyed directly within the vecinity of it. If i buy them in bulk , i wouldn’t mind using 2-3of them /ride to get it to low temps.
- a portable dry ice spray ? This one is prob. Not Convenient because it takes a large space to carry the ice
Any other ideas ?

 

[MarkF]

If your controller is not shutting down then it's not a problem. 50c or 122 F is not really that hot. Hot would start around 60C

 

[J.R.]

Why aren’t they made with liquid cooled capabilities or fans inside

BH Evo controllers are fully potted in RTV Silicone. About as waterproof as they come. Any kind of vents or fans would damage the controller from humidity alone. I think you should be ok without extraordinary cooling attempts. Motorcycle electronics get hotter and survive.

 

[Ebiker01]

BH Evo controllers are fully potted in RTV Silicone. About as waterproof as they come. Any kind of vents or fans would damage the controller from humidity alone. I think you should be ok without extraordinary cooling attempts. Motorcycle electronics get hotter and survive.

Oh great, i wasn’t really aware that they can withstand this temps. I’ll ride her w/o worries ‘ till she gets 60C hot from now !
I appreciate the informative reply

 

[JRA]

Are the EVO hub motors geared of DD?

 

[AHicks]

Is this controller in an enclosure of some type, or exposed, where air can circulate around it?

 

[Ebiker01]

Is this controller in an enclosure of some type, or exposed, where air can circulate around it?

Is basically encapsulated with a thick layer of RTV silicone and then the whole thing in an aluminium enclosure 2-3mm thick.
And then , this whole box is inside the downtube. And the only vents i see are in the frame itself, a few inches away from the controller but they are small (1-2cm) 2 of them. And not facing The controller or having the air getting there in any way. Those Are the downtube vents for water..
So no wonder the whole “brain” is getting hot fast !! They should have put a fan somewhere ...

 

[Ebiker01]

Are the EVO hub motors geared of DD?

I know it is an IGH so that means no DD... i’m still learning this aspects !

 

[JRA]

I know it is an IGH so that means no DD... i’m still learning this aspects !

Geared hub motor is different than an Internal Gear Hub (see the definitions thread)...Doesn't matter as if it is a geared hub my suggestion wouldn't work. But thanks for the reply.

 

[Alex M]

Why aren’t they made with liquid cooled capabilities or fans inside ??

This would complicate the design, increase the cost and add potential failure points. Not to mention being unnecessary. Even controllers placed inside the motor (like in DD) or inside the battery casing, don't usually need this.

DD and IGH are different things. DD is a hub motor type, IGH is a kind of "enclosed derailleur". I usually see IGH coupled with mid-drive motors, not hub motors.