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Power Systems Talk about motors, ESC speed controllers, gear drives, propellers, power system simulators and all power system related topics

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Old 06-17-2011, 10:27 PM   #1
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Default Oh oh thiers that smell again

hey guys ,was out taking a little foamy for a spin and think I pushed it too hard, when it came down you could instantly smell it so I changed bats kicked up the Thro. and it just stutterd and wouldnt start, ok so went back to the shop hooked up another ESC and ditto, same thing. so took the motor apart and the windings/magnets looked good, but it had that all familiar smell it turned over but just didnt feel right,what goes bad when ya cook a motor?

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Old 06-17-2011, 11:07 PM   #2
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Originally Posted by kvflyer View Post
hey guys ,was out taking a little foamy for a spin and think I pushed it too hard, when it came down you could instantly smell it so I changed bats kicked up the Thro. and it just stutterd and wouldnt start, ok so went back to the shop hooked up another ESC and ditto, same thing. so took the motor apart and the windings/magnets looked good, but it had that all familiar smell it turned over but just didnt feel right,what goes bad when ya cook a motor?
Normally the wires get burned up and short out, and that will burn out the esc with it. get a Wattmeter, that will save your electronics and your pocket book Take care, Chellie

http://www.wattflyer.com/forums/show...ight=wattmeter

http://www.wattflyer.com/forums/showthread.php?t=35216
How to test your brushless motor

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Old 06-18-2011, 04:51 AM   #3
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already did a watt M pre-flight but that wont help now, I believe it was drawing too many Amps and prolly over proped, like I said the ESC survived the motor didnot

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Old 06-18-2011, 05:47 AM   #4
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Originally Posted by kvflyer View Post
hey guys ,was out taking a little foamy for a spin and think I pushed it too hard, when it came down you could instantly smell it so I changed bats kicked up the Thro. and it just stutterd and wouldnt start, ok so went back to the shop hooked up another ESC and ditto, same thing. so took the motor apart and the windings/magnets looked good, but it had that all familiar smell it turned over but just didnt feel right,what goes bad when ya cook a motor?
Take a look:
http://www.wattflyer.com/forums/showthread.php?t=35216

Maybe you'll be lucky and something will show up.

If you've cooked the windings, what likely happened is the insulation varnish got damaged, resulting in shorted turns in the copper windings in your motor. When the motor is spinning, either under power, or with a battery operated drill, those shorted turns will have very high currents flowing in them. (That's why the call them "shorted turns"!) Those are hard to find with a digital ohm meter. But, if you spin the motor with a battery operated drill per the above thread at around a thousand or three thousand RPM, shorted turns are going to get hot.

This thread has a fair amount of info in it. Hope it helps!

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Old 06-18-2011, 02:59 PM   #5
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Originally Posted by kyleservicetech View Post
Take a look:
http://www.wattflyer.com/forums/showthread.php?t=35216
...
This thread has a fair amount of info in it. Hope it helps!
Yup. I always refer people with motor/esc problems to it. In my favorites list.

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Old 06-18-2011, 05:24 PM   #6
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thanx for the info also check in my post re the MP motor I fried, maybe thatll explain it better, like I was saying it was prolly over proped heres another question Im assuming is correct but just making sure>>>>>is 3 W per motor gram sound right? for example if ya gotta 19G motor you should have around 57 W....that sound about right?

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Old 06-18-2011, 10:00 PM   #7
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Originally Posted by kvflyer View Post
thanx for the info also check in my post re the MP motor I fried, maybe thatll explain it better, like I was saying it was prolly over proped heres another question Im assuming is correct but just making sure>>>>>its 3 W per motor gram sound right? for example if ya gotta 19G motor you should have around 57 W....that sound about right?
Yeah, a good quality brushless motor should handle 100 watts/ounce or about 3.5 watts per gram of weight. That is, assuming you're running the motor with the proper number of cells. (You can't get 100 watts/ounce out of a motor if you use 3 cells, when the motor is rated at 6 cells!)

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Old 06-19-2011, 01:21 PM   #8
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As far as frying is concerned, power (in Watts) going to the prop is not important, it's the current that kills, the power that stays behind in the motor.

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Old 06-19-2011, 03:28 PM   #9
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If you prop RIGHT 3W is OK. You can prop wrong and produce mostly heat.

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Old 06-19-2011, 06:15 PM   #10
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Originally Posted by flydiver View Post
If you prop RIGHT 3W is OK. You can prop wrong and produce mostly heat.

I agreed..........I see your from seattle, where ya been flyin? in the goodole days we flew in some local parks till they threw us out

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