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Do electric motors lose power/performance over time?

Taipan

Elite Veteran

Sydney, Australia

I always assumed as long as their bearings were kept in good order and not heated to melting point they would last indefinitely? Or would their magnets & windings deteriorate when exposed to continous heat?

The reason I ask is if my 2+ year/ 400+ flight old Scorpion 4035-560 is too old & could be the issue of gov mode not working as detailed in this thread; http://rc.runryder.com/helicopter/t633736p1/

03-01-2011 Over year old.
Supercoolheli

Key Veteran

Stillwater, Oklahoma

Or would their magnets & windings deteriorate when exposed to continous heat?
I'd assume so, but maybe you're right about the bearing replacements. I definately wouldn't fly a motor over 200-300 flights, but that's just me

Eric Olson:
Team SAB USA
Team Pulse Ultra

03-01-2011 Over year old.
steffgiguere

rrProfessor

St-Eustache, Quebec, Canada

I have a Scorpion in my Logo 500Se with 320 flights and still going strong...have never changed anything in it. Yes I do oil every 10 to 20 flights.

Team Synergy, Canada: Team Scorpion

03-01-2011 Over year old.
HOMEPAGE  
Supercoolheli

Key Veteran

Stillwater, Oklahoma

i oiled mine back when i was flying the Trex 500, but i don't oil them anymore. I will just replace the bearings when they go out

Eric Olson:
Team SAB USA
Team Pulse Ultra

03-02-2011 Over year old.
airdodger

Elite Veteran

Johnston USA

Magnets can loose their magnetism if overheated, I dont know how much heat the motor magnets are good for. I installed magnets in a fan once by using a heat gun and ruined the magnets.

Chris

03-02-2011 Over year old.
Heliguychris

Key Veteran

Perth, West Australia

Good question Kev, im really interested for the answer.

My guess is the would degrade over time, and lots of heat cool cycles.

Ive got a couple of motors here, that were very "nodey" when new, that spinn much freer, as the magnets have aged. Not run especially hot, just lots of use.

Also, you know how ya magnatize a screw driver, by sliding it on a magnet, i suspect that each time a screwdriver, or any metal object is attracted and sticks to the can of a motor, you are losing magnetizm from the motor magnets.

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

03-02-2011 Over year old.
HOMEPAGE  
OICU812

rrMaster

Edson, Alberta, Canada

If ran within the paramters the answer is NO. I myself do not have hundreds or more on single motors but I do know people non sponsored, non claimed pilots who have easily ran over 2-3 thousand flights on their 4035 motors and only ever changed bearings and shafts as maintence.

The temps that most well built e motors are built for is well almost unattainable really.

For example on the 4035 series of Scorpion the "WIRE" itself is rated to 180 Degrees C (356 Deg F)

The Magnets themselves are rated for 200 Degrees C or (392 Deg F)

In the hottest weather last year I temped the "core" hottest parts of any E motor at 190 F so I was very well within the limits and this was an ambient with humidity index of 110+ Deg F at Ircha 2010.

What many miss out on is this. Many claim and beleive the bearings are shot from the heat, well yes and no. The heat itself? =NO, the heat of the motor itself? = NO What I myself found in helping many others at the field is when it gets very warm outside our main gears expand, and expand they do a fair bit people. Thus creating "tight mesh" on their pinion and drive train, putting side loads on the shaft, transfering to the bearing and at 25K plus rpm in spinning you can imagine this havoc.

Something to think about, is always keeping an eye on mesh, and on your play on shafts, but direct to question again wear out, not really as long as used within the manufacturers specs be well.

...Once upon a time there were Nitros, flybars and frequency pins...

03-02-2011 Over year old.
Heliguychris

Key Veteran

Perth, West Australia

Why do my motors seem to wear out tho ?

[/quote]Yea that's it the "setup", lol, hook line and sinker!! [quote]

Haha , juss playing Shawn

I gladly admit to a abusing them lol Cheers mate.

Licensed (CASA) UAV operator certificate holder 1-YFOF5-01 www.helicamaerial.com.au

03-02-2011 Over year old.
HOMEPAGE  
Taipan

Elite Veteran

Sydney, Australia

If anyone needs a motor tested to the max, send it to Heliguychris! I won't use anything unless it is HGC proof.

Cheers for that Shawn, as much as I thought. I know there are temp limits on the magnets & windings & that we never exceed them anyway. Still I can't help but wonder if maybe these limits are over rated?

Yeah, meshing is very important! Also you can get heat from friction alone. Not surprised pinions get so hot from motors themselves & gear mesh friction.

I would still like to see some method used to loct shafts to bearings so that they can never slip. Maybe using keyways or large nuts around shafts like those used to secure clutch bearings on some nitro helis.

03-02-2011 Over year old.
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Do electric motors lose power/performance over time?

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