Oh How Original Posted January 29, 2015 Share Posted January 29, 2015 I know I sometimes do post up some very obvious/stupid threads about stuff I've simply not thought through, but I've just never ever heard this particular noise before. Just bound up and calibrated my Flysky GT3B (brand new receiver) to my AE SC10, and when you press the throttle then let it off (happens with reverse too) it's making a weird noise, like a machine beeping. Made a little video to demonstrate the noise, and just wondered if this is normal? I've never run these particular electrics before, so I'm a bit unsure. I can't see any sparks from anywere, the motor turns smoothly by hand, the magnets seem fine, the ESC hasn't smoked, I bound and calibrated it all correctly. http://i1333.photobucket.com/albums/w624/PencilLinezDesigns/20150129_150119_zpsau5fmmin.mp4 Quote Link to comment Share on other sites More sharing options...
Tug Posted January 29, 2015 Share Posted January 29, 2015 That's a new one on me, but it sounds like the ESC is agitating the rotor. The same way the ESC uses the rotor to make the switch on beeps, but I could be wrong, wouldn't be the first time. Where's Suicideneil when you need him? Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 It's not something I've ever heard before... It's slightly different to the switch on beeps though, they are more of a beep beep, were as this is a bit duller and more drawn out. Thing is, I've looked for lights on the ESC and nothings happening any different to normal. I'm mainly concerned with if it's safe to run. Quote Link to comment Share on other sites More sharing options...
Noj Posted January 29, 2015 Share Posted January 29, 2015 Most bizarre indeed. Which combo is fitted? Quote Link to comment Share on other sites More sharing options...
turok007 Posted January 29, 2015 Share Posted January 29, 2015 can you do it any slower as it sounds like the ESC getting the motor to start. Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Most bizarre indeed. Which combo is fitted? ESC is the SC700-BL, the motor I'm not 100% sure of, the seller couldn't remember the brand. I'm not overly fussed as a replacement motor isn't too much money, I just don't want to make the trip up to my mates field only for the motor or ESC to blow after a few minutes lol. can you do it any slower as it sounds like the ESC getting the motor to start. Any slower how? If I keep the power on slowly, it doesn't do it, it's only when the power goes on then off. Quote Link to comment Share on other sites More sharing options...
Tug Posted January 29, 2015 Share Posted January 29, 2015 Does it only do it with the pinion removed? If yes, could be the ESC applying drag brakes? (If your drag brakes are on?) 1 Quote Link to comment Share on other sites More sharing options...
turok007 Posted January 29, 2015 Share Posted January 29, 2015 can the punch be turned right down. or can you make the noise without the motor turning. try a very fast throttle movement. Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Does it only do it with the pinion removed? If yes, could be the ESC applying drag brakes? (If your drag brakes are on?) I've not tried it with pinion yet, I'll do that now, sorry, nipped to Tesco can the punch be turned right down. or can you make the noise without the motor turning. try a very fast throttle movement. I don't have a program card for the ESC so can't program it, well you can but I don't understand how on the PDF via the tx. Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Doesn't appear to be making the noise when it's got the pinion on, but their is a small noise like a tight mesh (even though it isn't tight) with the pinion on. Does it sound like perhaps the motor is buggered? :/ Quote Link to comment Share on other sites More sharing options...
Tug Posted January 29, 2015 Share Posted January 29, 2015 Not to my ears, no. Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Hmmm, well I just gave it a good blast outside, it seems fine :/ motor isn't hot, esc isn't hot, lipo isn't hot, power was fine, bald tyres, in the wet, 2WD... Many slides Quote Link to comment Share on other sites More sharing options...
Tug Posted January 29, 2015 Share Posted January 29, 2015 Good enough for me! Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Yeah, I imagine if it was something major, then someone would have had it before. If it blows, it blows, but it didn't seem lacking in power or anything. Quote Link to comment Share on other sites More sharing options...
NuttyProfessor Posted January 29, 2015 Share Posted January 29, 2015 (edited) Brushed esc's make a noise, my Fusion esc used to make like a supercharger whine as you accelerated but came from the esc. That sounds like resonance,is the motor tightened right up to the mount? Is the end bell/front cap of the motor loose? Is there any metal loose on the chassis? Edited January 29, 2015 by NuttyProfessor Quote Link to comment Share on other sites More sharing options...
shdaxner Posted January 29, 2015 Share Posted January 29, 2015 That sounds like tiny vibrations to me. Quote Link to comment Share on other sites More sharing options...
NuttyProfessor Posted January 29, 2015 Share Posted January 29, 2015 That sounds like tiny vibrations to me. Exactly Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 It's a brushless ESC so that doesn't explain it. Motor is tight, all the components are tight, that was the first thing I checked (after simply looking for sparking) the weird thing is it sounds fairly normal with pinion on blasting up and down the street, it's certainly no slouch, so I don't think it's anything bothering the performance :/ just hope it doesn't blow the electrics prematurely. Quote Link to comment Share on other sites More sharing options...
NuttyProfessor Posted January 29, 2015 Share Posted January 29, 2015 Well the pinion is balancing the rotor as it spins, check for a dodgy bearing. Quote Link to comment Share on other sites More sharing options...
Gaz! Posted January 29, 2015 Share Posted January 29, 2015 I was always led to believe you shouldn't run a brushless motor without load? Could this be the cause of the noise as the motor had no load on it? Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Well the pinion is balancing the rotor as it spins, check for a dodgy bearing. If it's a bearing I'll leave it until it goes all together lol. I was always led to believe you shouldn't run a brushless motor without load? Could this be the cause of the noise as the motor had no load on it? Never been told not to, I was basically just checking everything was going in the right direction before putting the pinion back on. Quote Link to comment Share on other sites More sharing options...
Saabmania2 Posted January 29, 2015 Share Posted January 29, 2015 Doesn't sound like any bearing I've ever heard going but you never know, I have heard that sort of noise when you get hold of a motor shaft and spin it quickly with your fingers although that was on smaller motors and normal but the same could be the case here . Quote Link to comment Share on other sites More sharing options...
Noj Posted January 29, 2015 Share Posted January 29, 2015 You can give a quick, low throttle test burst on a BL can, that is all. Revving without load is for newbies and the plain daft.......so good job you checked, OHO..... Quote Link to comment Share on other sites More sharing options...
Oh How Original Posted January 29, 2015 Author Share Posted January 29, 2015 Certainly haven't hammered it... Only a couple of quick bursts and that was only for the video. But it was doing it from the very first throttle tickle anyway. Quote Link to comment Share on other sites More sharing options...
Noj Posted January 29, 2015 Share Posted January 29, 2015 (edited) Run it until it dies!! What is the worst that can happen?? Human Death? Unlikely, ergo, no reason not to Edited January 29, 2015 by Noj Quote Link to comment Share on other sites More sharing options...
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