Chargrilled Swordfish

[gsbuickman]

A 40 second run producing a red-hot motor sums it up, bad motor...................poor ESC

I tend to agree with you Carl, it doesn't sound like any kind of water damaged esc issue t o me. I am almost wondering if he seized and spun a bearing rather than blowing it out ??? . I've never had it happen myself but I've seen it a time or two & it generates an incredible amount of heat in a real quick hurry

[tlandauer]

I have burned three motors and if anything, two of the incidents were my set up. Each time there is a strong burnt smell and the heat is tremendous from the motors and you know there was a short. All you need to do is spin the shaft and you can feel a mushy feeling with severe friction. I know it wasn't locked rotors, but each time the ESC survived.
I am curious as to what kind of motor failure would take down an ESC?? Want to learn.
Thanks!

[kevinpratt823]

I have burned three motors and if anything, two of the incidents were my set up. Each time there is a strong burnt smell and the heat is tremendous from the motors and you know there was a short. All you need to do is spin the shaft and you can feel a mushy feeling with severe friction. I know it wasn't locked rotors, but each time the ESC survived.
I am curious as to what kind of motor failure would take down an ESC?? Want to learn.
Thanks!

Typically a shorted winding will not change the feel of the way the motor turns, perhaps your failures were more than just shorts. Extreme heat will cause loss of magnetism in rotor, that may be what your feeling. Shorts will kill the esc, but if you get off the throttle and stay off, sometimes the esc will survive.

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[IRON-PAWW]

Hmmmmm Well I took the motor apart. Both bearings appear to run smooth still. Certainly not graunchy. With the motor together I am able to spin the shaft normally - with the same feel as when the motor was new. However - I guess there could still be a fault that causes a bearing to lock at speed - but I can't replicate that on the bench. No black burns inside. However, I did find a very fine coating of iron filings in some spots. Not a lot, and very very fine.

To me it looks as if the lacquer on the windings has melted. Look at pic 4. So either way the motor is done right? - still I knew it probably was....

Hard to get good pics........



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[tlandauer]

TP lacquer does have a darker shade, very much like your picture. Unlike that of Leopard or Neu. Do you smell a distinct burnt smell?

@ Kevin,
the only reason I suspect that it was shorted was that it is the same feel as if you let the three motor wires touch each other, the motor immediately becomes difficult to spin. May be I am crazy.I thought that has the same effect as the windings having a short???

[kfxguy]

yea, looks like those windings are done for. there should be no dark coloring to it. hold tight, I have a burnt leopard that was sent to me the othere day for inspection. i'll post pics

[Make-a-Wake]

Check out your pic

[kfxguy]

check out your pic

agreed

[Make-a-Wake]

I would certainly try for warranty on the motor, hopefully they dont feel its been compromised by dismantling it. I'd ask for some restitution on the ESC as well, cant hurt to ask.

[Make-a-Wake]

I may get pounced on for this, but i would confidently run a T120a with that 1515 you are considering, even on 6s. I ran my 4074 2200kv Leopard in my Pursuit with the T120 for a whole season, only $49 risk this time. If you dont feel comfortanle about that, the Hoss T180 Steven sells here will get the job done with NO question.

[flraptor07]

I'm gonna agree with most that the motor is the culprit, deffinetly looks like 1/2 the windings are fried in that pic. I'm running a TFL Ariane with a Swordfish 240 Pro Plus, TP4070 1770kv, and a Prather Stainless 230 48.5mm 1.6 pitch, on 6s. After a 6 lap heat temps are 120deg.F range on everything except packs and packs are usually around 90-95deg.F Average amp draw is around 160 with spikes up to 230 or so. My set up is a bit more agressive than yours and I have no issues.

[kevinpratt823]

TP lacquer does have a darker shade, very much like your picture. Unlike that of Leopard or Neu. Do you smell a distinct burnt smell?

@ Kevin,
the only reason I suspect that it was shorted was that it is the same feel as if you let the three motor wires touch each other, the motor immediately becomes difficult to spin. May be I am crazy.I thought that has the same effect as the windings having a short???

I stand corrected, didn't even occur to me that it would have that effect, but just tried the 3 wires together thing, definitely feel the difference! I will have to ponder that a bit, learn something new every day.

[Rocstar]

I have a burnt leopard that was sent to me the othere day for inspection. i'll post pics

How are you testing bad motors? I thought about using my megger to test the windings like I use on industrial motors, but haven't tried it yet.

[kfxguy]

How are you testing bad motors? I thought about using my megger to test the windings like I use on industrial motors, but haven't tried it yet.

Well this one was black like the one above but a little worse, but I tested it like this.... (pretty obvious when you see it lol)

[tlandauer]

FWIW, one of the motors I burned was a Neu 1515 1y which I sent back for rebuild. I talked to the tech dept. and specifically asked if the magnets are ok on the rotor since the temp was so high. They performed test(s) and replied that my rotor is good and all I needed was a new stator.
When the Neu burned, it just stopped and smelled awful, the ESC was fine.
I wonder if the ESC (SK180) has a better software profile for deteccting motor failure, because I remember clearly holding full trigger a few times despite knowing that it is a No NO.
Also IMO the damage is accumalative, you can have a good run from the previous day and on the day of the failure all it can take is just 30 sec.
Just my $.02

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