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T-REX 450 › How Hot Is Too Hot?
04-26-2009 02:17 AM  9 years agoPost 1
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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Has anyone ever measured the temperature of thier esc after flying with a mini temp gun? After flying my T-Rex for 7 mins of normal sport flying my Align 35 amp esc reaches a temp of 157 degrees, which seems like really too hot. What do you think, any opinions on this matter? My battery isn't even warm to the touch, but my esc sure is! Any help would be greatly appreciated!

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04-26-2009 04:38 AM  9 years agoPost 2
dkshema

rrMaster

Cedar Rapids, IA

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That's about 70 degrees C, the components -- switching FETs and regulators are probably good to at least 125 degrees C, perhaps 150 degrees C, junction temperature (way deep down inside the silicon guts) depending upon which grade parts are used in its construction.

So 70 degrees C isn't all that alarming.

You don't mention the ambient temperature, the motor you're using, where you've got the ESC mounted and what kind of cooling it might expect.

Also, what throttle curves are you running, and on the motor, which pinion?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-26-2009 10:43 AM  9 years agoPost 3
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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The temperature outside is 80 degrees, I'm using the Align 3550Kv motor with a linear throttle curve from 0 to 100 because I'm still learning and I like to in control of my throttle. The esc is mounted up front on the bottom frame plate and the only cooling it gets is from the holes cut in the canopy. I don't really know what pinion is on the heli, I haven't really ever checked since I bought the heli. Does the pinion make that difference with everything else that I've listed? The motor gets pretty warm to but not as much as the esc, and the battery barely even changes temperature. From what you're telling me I guess I'm OK but it just seems that the esc is pretty warm.

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04-26-2009 11:10 AM  9 years agoPost 4
Ben-T-Spindle

rrProfessor

Central Illinois

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157F is cool for ESC’s and motors. 180-190F is a good nominal temperature. Once temperatures get close to 200F then you need to do something to prevent a burn out.

Just keep on flying

.

... BTS

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04-26-2009 01:34 PM  9 years agoPost 5
nivlek

rrProfessor

Norfolk England

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Does the pinion make that difference with everything else that I've listed?
Yes , it can make a huge difference .

At the end of the day , it gets dark .

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04-26-2009 01:59 PM  9 years agoPost 6
baby uh1

rrVeteran

St. James, Mo.

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Make sure that your bec circuit isn't overloaded also. I've had escs run hot because of a servo drawing too much power for the bec.

Anything is possible if you don't know what you are talking about!

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04-26-2009 02:52 PM  9 years agoPost 7
Gyronut

rrProfessor

Martinsville In.

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Genraly speaking if you can hold your finger on it, it's too hot.

I use a Quark 33 on my Rex 450 and after a 7 min its just warm.

Check your Belt tension.
Links too tight...
Gear mesh too tight...

Are you in Idle Up..??

Hopefully your throttle curve is higher that 85%...

Rick

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04-26-2009 06:43 PM  9 years agoPost 8
dkshema

rrMaster

Cedar Rapids, IA

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The linear curve may be a large part of your problem. Electric motors are very inefficient when "throttled down". That inefficiency translates to heat. Your much better off to run a throttle curve that allows you to at least stop the motor at low throttle, then pretty much run the motor at higher RPMs where it will be more efficient.

If you have a 5 point curve, something like 0 - 85 - 85 - 85 - 85 will work well (or even higher on those 85 numbers). That should allow you to run much cooler.

As for your pinion question, the higher the tooth count, the harder the motor has to work to spin the rotor blades. A lower tooth count will translate to lower head speeds, cooler motor, cooler ESC, and longer battery run-times. Less performance, too. A higher tooth count yields higher temps, higher head speeds, and shorter run times per charge. And better heli performance. It's a balancing act at best.

If you are transitioning from the nitro world, you really need to change the way you think about motors, speed, and the throttle setup. Generally speaking, your idle ups would have "curves" that are flat, and usually set to 85 or higher across the board. The motor, ESC, and battery pack will thank you.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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04-27-2009 07:38 PM  9 years agoPost 9
helinut4ever

rrApprentice

Knoxville, Tennessee-Knox

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Thanks for all the help guys, I can see that I have a few things to look at and number one being my throttle curve. I've never really experimented with throttle curves yet but I guess now's as good a time as any. All I do is sport flying so what would be a good throttle curve for me to experiment with, I have a DX-7 transmitter so I can use a five point curve. Also what would be a good pitch curve to match the throttle curve?

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04-28-2009 02:49 PM  9 years agoPost 10
airsoft1779

rrApprentice

Greenville,SC-USA

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you no that it is too hot when your shrink wrap on the ESC is melted to the frame of your heli and leaves a hole w/ no shrink wrap on your speed controler!

6s Trex 450 PRO and Vision 50 Comp.

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04-29-2009 04:10 AM  9 years agoPost 11
baby uh1

rrVeteran

St. James, Mo.

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You'll know that it's too hot when all of the magic smoke leaks out!

Anything is possible if you don't know what you are talking about!

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04-29-2009 04:25 AM  9 years agoPost 12
Spitfire1

rrElite Veteran

Perth Australia

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It took me a while to get my head around running 100% t/curves means cooler runnings, but it does.
Usually common sense would suggest running something flat out or high levels to be detrimental, but with e helis low revs cause overheating.

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05-02-2009 03:29 AM  9 years agoPost 13
ken22golf

rrApprentice

Bridge City, TX

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If you're looking for cool temps, my V2 with the stock 35X ESC, CC 10A BEC, and Neu 1107H/2Y on 14T runs VERY cool. I can run consecutive packs through it and the ESC and motor never get more than 100ºF. Well, the motor never got above 90 today.

With the stock 430XL on 13T and 35X w/ no external BEC, the ESC would hit 120 and the motor was about the same.

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