Posts: 5 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: May 2017 Reputation: 0 I just built a new quad using Emax RS2306 2400kV motors, and after a few test flights (just hover and a couple flips/rolls for 2 min or so), I tested the motor temperature and they were very hot. Not hot enough to burn, but hot enough that I was uncomfortable holding them. I've used Lumenier RX2206 2350kV and Emax RS2205 2300kV motors in other builds that I fly regularly, and I haven't experienced anything close to this issue before. The 2205s come down a little warm, but not hot. I'm using DSHOT150 (turned down from 600 per some random advice I stumbled across regarding motor temperature) on Armattan 30A ESCs. It has DAL Cyclone 5045 props on it. The FC is soft mounted with o-rings above and below board, motors are not.
I used a laser thermometer after 2 minute indoor hovers and found that the motors were hovering around 100-110 degrees F. All four of them were noticeably hot to the touch, but not quite as bad as the first flights (considering it was 2 minutes of hovering probably).
As far as what I've done to fix this, I've turned off the notch filter, tried turning down the I gain, and they're still very hot after flying for a bit. I haven't noticed anything particularly wrong with the tune, or the sound. I've checked the screws, they are not hitting the windings, it's a little hard to tell on the screws closer to the inside of the arm, but it still looks to not be touching (I also used the proper screw for the arm thickness). I'll be the first to admit that I'm not a great tuner yet, so I'm a little out of my depth here. But I'm very hesitant to fly this quad without figuring out if the temperatures are going to cause mid-flight problems.
Any thoughts or suggestions on fixes to hot motors? Or are the temperatures I'm seeing OK? ![[-]](https://intofpv.com/images/collapse.png) • Posts: 1,773 Threads: 30 Likes Received: 1,199 in 755 posts Likes Given: 714 Joined: Oct 2016 Reputation: 45 When you say you've turned off the notch filter, do you mean the gyro notch filter #1 or also the D Term notch #2? Without proper soft-mounting, this could cause your over-heating. But it could a lot of other things as well. That being said, 100-110 F may not be too bad, depending on weather conditions and the fact you're using fairly aggressive props. I'd try putting the notch filters back to default first and see if that makes a difference. • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 I have these motors on my SwiftBlade build with 6040 props and although I haven't had it out in hot summer weather yet, in the few flights I've had with the quad so far, I saw no signs of the motors getting too hot.
110F is bordering on too warm, but the motor temperature will depend a lot on how warm ambient temperatures are. Certainly, if you can't hold your finger to the motor's bell for five seconds, the motor is too hot and you should solve the problem before you start to make the magnets demagnetise.
As RENOV8R correctly points out, removing filters is the opposite of what you should do to solve problems with motors getting hot. Turning down I has nothing to do with it either.
From the point of view of the flight controller settings, a lack of filtering and too high D gain are what will adversely affect motor temperature.
The best way to start investigating the problem is to record a black box log and look at the motor values. If the motors are constantly speeding up and slowing down, then you need to look at why that is happening. Feel free to post a black box log here for people to look at and to tell us what flight controller and firmware you are using. • Posts: 5 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: May 2017 Reputation: 0 31-May-2017, 05:51 PM (This post was last modified: 31-May-2017, 05:53 PM by mimarcos.) (31-May-2017, 04:36 PM)RENOV8R Wrote: When you say you've turned off the notch filter, do you mean the gyro notch filter #1 or also the D Term notch #2? Without proper soft-mounting, this could cause your over-heating. But it could a lot of other things as well. That being said, 100-110 F may not be too bad, depending on weather conditions and the fact you're using fairly aggressive props. I'd try putting the notch filters back to default first and see if that makes a difference. I was noticing the over-heating before I tried any of those steps, sorry I wasn't clear. But 100-110 F was measured inside after just hovering, not during the maiden flight. The motors got VERY hot then, I'd say well over 100-110 F.
(31-May-2017, 05:17 PM)unseen Wrote: I have these motors on my SwiftBlade build with 6040 props and although I haven't had it out in hot summer weather yet, in the few flights I've had with the quad so far, I saw no signs of the motors getting too hot.
110F is bordering on too warm, but the motor temperature will depend a lot on how warm ambient temperatures are. Certainly, if you can't hold your finger to the motor's bell for five seconds, the motor is too hot and you should solve the problem before you start to make the magnets demagnetise.
As RENOV8R correctly points out, removing filters is the opposite of what you should do to solve problems with motors getting hot. Turning down I has nothing to do with it either.
From the point of view of the flight controller settings, a lack of filtering and too high D gain are what will adversely affect motor temperature.
The best way to start investigating the problem is to record a black box log and look at the motor values. If the motors are constantly speeding up and slowing down, then you need to look at why that is happening. Feel free to post a black box log here for people to look at and to tell us what flight controller and firmware you are using. Thanks so much for the advice! Yeah, I removed the filter after I was experiencing the heat because I had read something about the filter causing those problems. I'll reflash, get back to stock, and post a blackbox log (fortunately, this is my first FC to support that feature). • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 (31-May-2017, 05:51 PM)mimarcos Wrote: I was noticing the over-heating before I tried any of those steps, sorry I wasn't clear. But 100-110 F was measured inside after just hovering, not during the maiden flight. The motors got VERY hot then, I'd say well over 100-110 F.
Thanks so much for the advice! Yeah, I removed the filter after I was experiencing the heat because I had read something about the filter causing those problems. I'll reflash, get back to stock, and post a blackbox log (fortunately, this is my first FC to support that feature). Black box is the best feature ever! Once you start using it, you'll never buy a flight controller without it again. Posts: 5 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: May 2017 Reputation: 0 (31-May-2017, 05:58 PM)unseen Wrote: Black box is the best feature ever! Once you start using it, you'll never buy a flight controller without it again. I had taken a look at the logs for the indoor test hovers, but I didn't have the logs for maiden flight. It does look like a killer tool. I'll take it out tonight and get some log data and hopefully someone here can help me out  • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 Softmounting just with o-rings might not help much against yaw-noise, as it can happen that the screws still directly touch the FC. If you find that this is the problem, you could drill the holes a bit larger and also bevel them a bit, so the o-rings will nicely center the screw. • Posts: 267 Threads: 26 Likes Received: 37 in 25 posts Likes Given: 68 Joined: Aug 2016 Reputation: 2 If you feel not safe overboring the flight controller pcb holes grab a set of this: https://m.banggood.com/4-PCS-Realacc-M37...mds=search Safer and cheaper!! • Posts: 5 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: May 2017 Reputation: 0 01-Jun-2017, 07:04 PM (This post was last modified: 02-Jun-2017, 12:53 PM by mimarcos.) So I re-flashed to 3.1.7, and the only thing I did was drop D to 20/25 on roll/pitch (from 30/35). I actually flew three batteries - one gingerly, one moderately, and one a little more than moderately. I checked the motor temperatures by touch and laser thermometer and they were hovering around 100 F, and on the high end of warm to touch, which I was really happy about. I reviewed some Session 5 video from the flights and I noticed two things: yaw twitch and prop noise vibrato (couldn't see much in the way of oscillations outside of the yaw twitch).
I've attached blackbox, still looking at it right now, I don't think it captured all the flights I took. If anyone is in the mood to help me figure out how to tune this quad (with the heat issue in the background) I'd be incredibly grateful!
(Correction - I could not upload the .bfl file here, so I opened a link to Google Drive - hhttps://drive.google.com/file/d/0BxYb6Ii1GTfdQXFKYWZTTUc4cmc/view?usp=sharing) • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 "Access denied"
Google wants me to log in to access your log. • Posts: 5 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: May 2017 Reputation: 0 (02-Jun-2017, 09:21 AM)unseen Wrote: "Access denied"
Google wants me to log in to access your log. Sorry about that, had the permissions wrong. Updated the link and here it is: https://drive.google.com/file/d/0BxYb6Ii...sp=sharing Thanks for looking! • Posts: 2,286 Threads: 38 Likes Received: 1,527 in 995 posts Likes Given: 1,881 Joined: Apr 2016 Reputation: 72 That looks fairly good to be honest. Better than my completely untuned SwiftBlade that I have these motors on! What would help is if have a read of the tutorial that fftunes posted about setting your filters: http://intofpv.com/t-adjusting-filters-q...n-progress If you work through that, you can make sure that your filters are set to the right frequencies for your particular build. • |
