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Post by lesbaldry on Sept 1, 2009 14:15:48 GMT
DONT MAKE MY STUPID MISTAKE  I compared two rotors from different makes and one got damaged beyond use  ...one was laid on the bench while the other was placed around 10 to 15 cms away,the magnetic force took me by surprise and brought the two together with such a bang it removed a large chunk out of the brittle Neodium magnet...be warned the same could happen with any solid ferrous material close by!! |
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Post by Reuben on Sept 1, 2009 16:04:56 GMT
it surprised me how little damage needs to be done to the rotor to render it useless. When I cleaned out my 13.5 I noticed what looked like the black paint flaking at the bottom of the rotor, removed this and there was a very slight chip in the rotor at the bottom (no more that 1mm wide and length and 0.1mm deep) aka hardly noticeable apart from colour. But the slight chip means the sensors have trouble picking up that part of the rotor and because of this will not spin the rotor!
Luckily I had a spare rotor from my old trinity that smoked the stator and with this the motor works fine again.
Ide imaging the chip was caused by a small stone.
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Post by issac on Sept 1, 2009 20:49:56 GMT
on my bench i have a screw set just below the surface
when i strip the motor i place the rotor ontop of the screw ( becouse it is below the surface it doesn't touch )
this stops
A) it flying round the garage
b) Loosing it
hope this helps
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Post by Simon Crabb on Sept 1, 2009 21:09:55 GMT
You mean I have to take my brushless motors apart?!
I thought they were maintenance free?
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Post by lesbaldry on Sept 2, 2009 6:49:28 GMT
You mean I have to take my brushless motors apart?! I thought they were maintenance free? Ha ha  ;D It is amazing how much dust and debris can accumulate inside one though!!.....surprise your self and have a look inside a RX or speedo they too can attract lots of dust all over the PCB's. |
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Post by Reuben on Sept 2, 2009 8:18:06 GMT
and all that dust means poor heat disapation.
Dust is a good insulator of heat.
= hotter electrics.
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Post by oldtimeracer on Sept 2, 2009 8:21:08 GMT
Always worth stripping your brushless motor occasionally to blow out all the debris that can accumulate. Especially if you run the ones with extra cooling ducts.
As Les rightly points out, also check your RX and Speedo. With the RX debris can accumulate on the circuit board and the first bit of damp it will short and stop working. I have had a few do this and now check mine every so often.
With brushless rotors the magnets are incredibly strong and will fly across the bench quite easily attracted by any metal in the vicinity. Even worse if you have two rotors out at the same time. They seem to be naturally attracted to each other and can be easily damaged.
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Post by lesbaldry on Sept 2, 2009 15:51:15 GMT
and all that dust means poor heat disapation. Dust is a good insulator of heat. = hotter electrics. Yep a micron layer of dust is one hell of an insulator |
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Post by Reuben on Sept 2, 2009 16:27:47 GMT
agreed it wont make "that" much difference, but have you not ever hovered/cleaned the inside of your PC and wonder why it runs cooler and slightly better again.
Im sure you would agree that all electronics work better in cooler conditions, peak performance is always better when there is less heat and resistance. Therefore anything you can do to aid heat dissipation is surely better than nothing.
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Post by lesbaldry on Sept 3, 2009 7:01:49 GMT
agreed it wont make "that" much difference, but have you not ever hovered/cleaned the inside of your PC and wonder why it runs cooler and slightly better again. Im sure you would agree that all electronics work better in cooler conditions, peak performance is always better when there is less heat and resistance. Therefore anything you can do to aid heat dissipation is surely better than nothing. Blimey I didnt know that ....Ive only been on this planet 5mins ;D.....beside I dont think motors,ESCs' and RX's are large stationary units that sit under desks for years collecting mm's of human skin dust and hollow insulating hair fibers on the PCB's and heat sinks...do you? When someone who has been racing long enough to have the experience and feel the need to look inside a RX or speedo they will understand what we are talking about....mainly its very small particles of grass that can attract moisture! also some grit particals that can be ferrous...poke a magnet in one of these nasty liitle piles you find in the bottom of the speedo/RX casing and you may be surprised what sticks to it!!!!.....nothing to do with heat dissipation. |
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Post by Dave Chamberlain on Sept 3, 2009 9:32:12 GMT
Well I'm not so sure Les :-) Aren't super conductors chilled in liquid nitrogen? I think I may try super cooling my Ansmannm motor & esc... Now wheres that can of instant freeze!
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Post by lesbaldry on Sept 3, 2009 10:26:37 GMT
Now wheres that can of instant freeze! Unfortunately about 2 months away Dave ....any way how much is a flask of dry ice,doe's Terry sell them  |
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Post by Reality Racer on Sept 3, 2009 10:36:20 GMT
Dry Ice. Now that’s an idea. I'll get some in. Don't think it’s cheap though.
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Post by Dave Chamberlain on Sept 3, 2009 11:35:21 GMT
Works for the F1 Boyz.. And the local AmDram group! Cue Thriller sound track & zombies  |
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Post by yellowshark on Sept 3, 2009 19:26:14 GMT
How long does it take to collect a micron of dust then? Presumably longer than it it takes to blow up your brushless motor, best left alone then  |
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Post by mattsedgley on Sept 3, 2009 20:10:32 GMT
FYI! it takes about 1 week including a bank holiday to get a Brushless speedo back from repair!
Derek Bailey is amazing!
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...one was laid on the bench while the other was placed around 10 to 15 cms away,the magnetic force took me by surprise and brought the two together with such a bang it removed a large chunk out of the brittle Neodium magnet...be warned the same could happen with any solid ferrous material close by!!
;D
