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Old Feb 26, 2012, 06:01 PM
Registered User
United States, NJ, Fair Lawn
Joined Aug 2011
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My motor seized and smoked..why?

Hi,

I was flying a mini pulse xt for a few weeks until I crashed it and had decided to buy a new motor. I bought a Park 480 1020kv, a 10x8 prop, and a 40amp ESC. Everything worked well until recently i noticed that if i throttle up too fast the motor would stop spinning and make a loud noise. After another 3 flights i landed and noticed smoke coming from the cowl. Everything looked fine inside, but the motor no longer worked.

What exactly happened? I researched the prop and ESC and made sure to get the correct ones for this motor. I've heard that motors will smoke if the prop is too big for it, but i don't think this is the case since it's rated for a 10x8 prop.

Anyone have any ideas what could be wrong and how i can prevent this in the future?

Thanks
Felix
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Old Feb 26, 2012, 06:34 PM
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In Teh Garage (Rossville, GA. USA)
Joined Sep 2008
3,351 Posts
what about the battery/
Too big of a battery will fry a motor too.
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Old Feb 26, 2012, 06:36 PM
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Orleans, MA
Joined Feb 2007
2,089 Posts
You probably had timing problems before the meltdown. The usual symptom is a loud squealing sound as full throttle is approached. This is often resolved by programming the ESC for higher timing. Trying to operate the motor before resolving this problem probably resulted in overloading the motor.
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Old Feb 26, 2012, 07:11 PM
Registered User
United States, NJ, Fair Lawn
Joined Aug 2011
15 Posts
Battery is just a 3cell 2200mah.

The timing was set to use: Standard which is:

Quote:
STANDARD TIMING ADVANCE
Timing Degrees 15 & 20
Motor Poles 6 to 12
Expected Performance Good balance of power and efficiency
Motor Poles 14 or more
Expected Performance Best efficiency and run time (lowest power)

I can change it to:

Quote:
LOW TIMING ADVANCE
Timing Degrees 5 & 10
Motor Poles 2 to 4
Expected Performance Good balance of power and efficiency
Motor Poles 6 or more
Expected Performance Best efficiency and run time (lowest power)
OR

Quote:
HIGH TIMING ADVANCE
Timing Degrees 25
Motor Poles 12
Expected Performance Highest power, less efficiency
Motor Poles 14 or more
Expected Performance Good balance of power and efficiency

Which do you think would be appropriate?

Thanks!
Felix
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Old Feb 26, 2012, 07:17 PM
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Orleans, MA
Joined Feb 2007
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I'd try 25 degrees. Going higher seems to solve this problem with larger motors. Also, using a slightly smaller prop or lower pitch might make the timing less critical.
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Old Feb 26, 2012, 07:19 PM
Registered User
United States, NJ, Fair Lawn
Joined Aug 2011
15 Posts
Thanks i'll give it a try. Unfortunately i will need to spend another 50 bux on a new motor.

Thanks again for the help

Felix
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Old Feb 26, 2012, 07:19 PM
2 no or knot 2 no!
BC, Canada
Joined Sep 2009
765 Posts
the one that doesn't make the motor squeal. Please report back and let us know which one worked for you.
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Old Feb 26, 2012, 08:13 PM
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Kentucky
Joined Dec 2008
497 Posts
You can get a replacement motor that size for a lot less than $50.
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Old Feb 26, 2012, 08:14 PM
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United States, NJ, Fair Lawn
Joined Aug 2011
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I will let you know when i try it.

Ranandar: I already ordered a new Park 480, but where do you buy your motors?
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Old Feb 26, 2012, 09:31 PM
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United States, FL, The Villages
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felixk - this is said with dignity, respect, and love in my heart ... you need to read more of these threads!
Don
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Old Feb 27, 2012, 06:02 AM
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Letchworth, Great Britain (UK)
Joined Jul 2004
11,744 Posts
Quote:
Originally Posted by felixk View Post
... What exactly happened? I researched the prop and ESC and made sure to get the correct ones for this motor. I've heard that motors will smoke if the prop is too big for it, but i don't think this is the case since it's rated for a 10x8 prop.

Anyone have any ideas what could be wrong and how i can prevent this in the future? ...
The most useful tool to prevent it in the future is a wattmeter like one of these http://www3.towerhobbies.com/cgi-bin...eter&search=Go.

Just because your motor is "rated" for a 10x8 prop, it's always good to check the actual amps yours is drawing, for manufacturing variation in motor and prop can make a difference to the amps. As it happens, the ad I've seen for your motor suggests 10x7 to 12x6, so for the highest recommended voltage (3S for this motor) you must use the smallest prop. So, with 3S, maybe 10x8 was simply too much for it. Without a wattmeter or ammeter, you wouldn't know.
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Old Feb 27, 2012, 07:30 AM
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Kingston, Canada
Joined Jun 2004
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Another little hint. If it does squeal when you throttle up, get the throttle back quick. If you hold the throttle up and let it squeal, it will toast the motor in a matter of seconds. The ESC will also get very hot and in danger of going up in smoke too.
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Old Feb 27, 2012, 07:55 AM
You're killin' me Smalls
BrownEyedFool's Avatar
United States, NJ, Hillsborough Township
Joined Sep 2011
1,607 Posts
Does that squeal you're talking about sound like a screeching bearing shrieking it's head off? If so maybe that's what's going on in my UM T-28. It's bone stock but if I take it to WOT it shrieks like a banshee, I've assumed it was the gearbox binding but perhaps a timing issue? Worth exploring since I've got replacements (stock) on the way to swap in.
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Old Feb 27, 2012, 08:10 AM
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flypaper 2's Avatar
Kingston, Canada
Joined Jun 2004
12,928 Posts
For now, you might try a smaller prop. I have a little VTO Pogo that had to take off with full throttle to get it off the ground quick. It would squeal in protest till I advanced the timing. It would take off with no screaming after that.

Gord.
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Old Feb 27, 2012, 08:37 AM
You're killin' me Smalls
BrownEyedFool's Avatar
United States, NJ, Hillsborough Township
Joined Sep 2011
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Hmm. Parkzone products are known for perfect internal config right out of the box, I have no idea how to check or change the timing in this unit. Couple that with some light blackening on the teeth of the main gear, it's less likely.

But I'll cease the hijack anyway and go to PM or micro rtf board.
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