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Blade 400 › 3D ESC Still Very Hot
03-05-2008 11:36 PM  10 years agoPost 1
Wolfpackin

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Avon, CO

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I think I've exhausted all options as far as solving my hot ESC problem.

I tried a friends NIB stock ESC and it got very hot. I tried a new stock motor, ESC still hot. Tried different belt tensions, still hot. I ran just the servos, no motor and then just the motor, no servos and didn't get excessive heat. It only gets extremely hot when I fly it.

The heli is 100% stock except for a DSP75 on the tail. The heli lifts and flys great. I'm flying at 8,000FASL.

I think my only option is to try another ESC with a higher amperage rating.
Can I use an Align 35A/5V BEC as a replacement? It has the EC3 battery connector and looks to be the same as stock otherwise. Would this just be a PNP replacement?
What do you think?

Thanks.

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03-06-2008 04:55 AM  10 years agoPost 2
duff

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Calgary, Alberta, Canada

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I don't know of any documentation that states the hard cap on operating temps for the 25 Amp ESC by eflite. Have you burned the ESC out? After a flight my ESC is always hot. Your ESC could be working as intended. As a computer tech I know power mosfets on motherboards can reach an extreme temp that you cant even touch and still operate with no issues.

Heat on electronics will shorten the life and the lower the temp better. but in this case looks like there is no way around this. Without adding a heavier heatsink with better cooling.

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03-06-2008 05:12 AM  10 years agoPost 3
Wolfpackin

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Avon, CO

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I did ask Horizon if they had any numbers for the normal operating and maximum temps for the stock ESC and they had none.

Most people have been advising that the ESC should only be warm to the touch and 130F-145F is too hot, that's where I'm at. It has not burned out yet.

Someone suggested that my throttle curve 0-50-85-92.5-100 might be bypassing the soft start if I throttle up too quickly. And that might cause the ESC to heat up too much.

What do you think?

Thanks.

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03-06-2008 05:18 AM  10 years agoPost 4
duff

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Calgary, Alberta, Canada

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If only I knew imperial lol... I don't know enough about RC speed controllers to really comment further. I was just giving input from the experience I have had with other electronics. Lots of heat will always shorten the life, how much life will your ESC have? Couldn't tell ya.

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03-06-2008 05:31 AM  10 years agoPost 5
Wolfpackin

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Avon, CO

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I appreciate your input.

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03-06-2008 04:58 PM  10 years agoPost 6
tonyn

rrApprentice

orlando florida

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[quote]Someone suggested that my throttle curve 0-50-85-92.5-100 might be bypassing the soft start if I throttle up too quickly. And that might cause the ESC to heat up too much.

Wolfpackin
im thinking you need to lower you number 2 position on your throttle curve. what you said about bypassing the soft start if I throttle up too quickly. sounds right to me try to lower that number and let us know if its still getting really hot. its gona get hot but hopefully not as hot as you said it was before.
im running Castle Creations Phoenix 35 ESC's in my trex and blade 400 they get pretty hot to.

let us know

Flying

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03-06-2008 08:05 PM  10 years agoPost 7
Wolfpackin

rrApprentice

Avon, CO

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tonyn,

Yup, I did lower Pos 2 already from 50 to 40.

In the three tests I did last night I slowly powered up, to approx. 50% throttle, and waited for rpm's to peak before moving on.
In the tests I did, temps seemed to be lower by 10-20 degrees.
I need to borrow an infrared thermometer and run some additional tests before I say anymore.

But so far, so good.

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03-09-2008 07:04 AM  10 years agoPost 8
duff

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Calgary, Alberta, Canada

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I was able to lower my ESCs by bypassing the onboard BEC with a 3rd party BEC. See the pic. I did some servo upgrades "HS-65MGs" that were pulling to much off the BEC. I am not sure that other people had to add a BEC, maybe I have a sub par ESC.

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