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Home✈️Aircraft🚁HelicopterHelicopter Main Discussion › Motor Smoked Help
08-31-2015 04:35 PM  4 years ago
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theriddick45

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United States

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Motor Smoked Help
MX 750 530kv Smoked Log was clear before this happen I cleared, this is the first logged. I did 4 to 5 autorotation and after that I was going to take off flick out of hold and it sound like the motor eat the main gear but no violent movement on the Heli and smoke came out.

Flip back to hold and ran to the Heli and disconnect the battery from the ESC. Smoke stopped right away and the battery wires were warm but the ESC was not warm.

What do you think happen it was working fine and was a new motor.

Setup was 112/10 = 11.2 gear ratio. I was flying at 1400hs. Packs are still at 85%. Like I said was just 4 to 5 Autos.

I have put less than 50 flights on this motor. I Have my other Heli with a 450kv same MX 750 but before I put it on I want to make sure the ESC is not the reason I did fly this Castle ESC 120hv and setup was PWM 12 and 16 been much better for the ikon gov. Motor timing was always the same at 5.

Here is a pic of the log.

Suzi Janis 800e & 700e 3blade both w/Ikon
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09-01-2015 12:29 AM  4 years ago
EEngineer

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TX

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Is it something like the motor bolts being too long and making contact with the motor coils?Logo 600SXs, 800XX, TDR IIs
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09-01-2015 01:33 AM  4 years ago
flyboy1985

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maybe just a short in the motor and a freak thing?going pro , one crash at a time
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09-01-2015 01:39 AM  4 years ago
theriddick45

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I always check to have clearance between the motor screws and the cables so no I don't think that was the problem.

This is the first time for me so I am looking for answers but I know is hard to find out the reason.

I just like to know if this happen before to any of you out there?
Suzi Janis 800e & 700e 3blade both w/Ikon
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09-01-2015 01:54 AM  4 years ago
EEngineer

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TX

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I always check to have clearance between the motor screws and the cables so no I don't think that was the problem.
Just wanted to eliminate the most simple thing...
Logo 600SXs, 800XX, TDR IIs
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09-01-2015 02:37 AM  4 years ago
theriddick45

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i thank you for that man but I feel frustrated that as careful as I am and this thing happen. I want to find the reason. Now I don't know if I should trust the esc and just get a new motor or change all.

See the esc is old but I don't know the life span of it. I am thinking to change both to alimanate another issue.
Suzi Janis 800e & 700e 3blade both w/Ikon
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09-01-2015 03:32 AM  4 years ago
icanfly

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ontario

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does the esc have to restart from slow spool up every time your auto ends? If your giving cp early the esc can bog (I personally hate this about the cc esc) where-as it should be programmable to get the esc to keep rpm high. Your timing is too low really, should be 8 or 10 and pwm usually about 16 to 18, you'll know it's right when the temp is down.

good luck there, watch out when you mix new motors with older esc's, like pc's or cells everything is changing in small but significant steps, the new and older may not be entirely compatible.
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09-01-2015 04:25 AM  4 years ago
EEngineer

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TX

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See the esc is old but I don't know the life span of it.
But the motor is new...and of the latest tech?

ESC's keep improving over time and motors demand more...

Hope you get your issue figured out....stuff like that just makes ya wanna pull your hair out.
Logo 600SXs, 800XX, TDR IIs
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09-01-2015 12:29 PM  4 years ago
theriddick45

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I was spooling in soft start after the autos. After the incident happen I unplugged the motor and checked the log and see if the esc was damage. It doesn't seem to have anything but I am not trusting it I think I will get a new one just in case so new motor and esc just to be safe than sorry.

I am just curious if this had happen before. I will inspect the motor inside to see if I can find the short just to satisfy my curiosity.

Thanks!
Suzi Janis 800e & 700e 3blade both w/Ikon
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09-01-2015 06:20 PM  4 years ago
prototype3a

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Christiansburg,VA

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I would guess that the only way to know what happened is to look inside the motor.~Drew
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09-01-2015 07:40 PM  4 years ago
cudaboy_71

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sacramento, ca, u.s.

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were you spooling back up from a low throttle position, or was the motor completely off?

were the blades still spinning?

[edit] I found the video I was thinking of when I read your post--especially with regards to shooting autos and having a load on the motor when you restart.

Even though he is speaking about loading up the ESC and popping it, there's a chance that a brief 'super load' like that (if the ESC can deliver it) will melt the motor windings if it is allowed through.

If the video doesn't start automatically at 3:40, that's where the info is.

Watch at YouTube

?t=3m40s
if it ain't broke, break it.
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09-01-2015 10:16 PM  4 years ago
theriddick45

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To answer your questions...

I did land on all autos and spool up while the blades were still spinning slow but they were. It always spoil up on soft start. That is why I was able to quickly stop the blades and unplugged the batteries quick from the esc.

That quick reaction save my Heli because there were smoked coming out from the winds. And the wires on the batteries were warm but like I said before the esc was not.
Suzi Janis 800e & 700e 3blade both w/Ikon
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09-01-2015 10:55 PM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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Auto rotation bail out and multiple spool ups are really hard on the ESC.

What you had was probably a commutation error and since CC don't have active freewheeling and the selection of components, you experienced what you did. luckily it wasn't in flight and losses is minimized.

A lot of variables could add to like like:
- type of esc
- quality of solder joint (believe it or not, i would take temp reading of my solder joint. high temps are indication of a not good solder joint or failing joint)
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09-02-2015 04:16 AM  4 years ago
icanfly

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ontario

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I was spooling in soft start after the autos
it's possible the repeated soft starts are hard on the motor. Solder joint a problem? this reminds me of running too long of extension cords and burning up a power tool, the tool is over pulling on amps that are having a hard time getting to the tool due to high resistance leading to a square wave of supply, square wave resulting in HEAT in an inductance coil, a coil, copper coil, could it be? (I think it's how it goes but not 100% certain without a www double check on the theory), put a load on the motor with few amps and it'll burn up due to irregular supply. heli bl motors need to be run near 100% to keep very happy or they will heat up.

Hey dad I'm going to take up rc helis, I'll have to be an engineer, electrician, pilot, radio operator, mechanic, problem solver, was there anything else, lol, wish me luck.
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09-02-2015 09:25 PM  4 years ago
Heli Fanatix

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Fountain Valley, CA

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That is pretty much what you have to be when you start flying the bigger heli's. The paradox to this hobby is you have to be a pilot and Proficient builder.

Not to start a controversy but sometimes knowing just enough lets you be dangerous. some things will work, but not properly. If you are not proficient with your setup and you push it the very limits, bad things will happen. Some of us are flying on borrowed time. you have to really understand what you are doing ... if you don't, gotta get it from a credible source.

and who is the "credible source?" ..that might be harder to find than the actual problems unless you really know how to look for it. when you find the source, you will find 98% your answers.
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