Grinding noise on Turnigy 2217

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I've lots of ESC's lying around whilst I was building my octo (which turned 
hexa). Have been flying happily with SimonK firmware for a while (never used 
bell-motors)

Steps followed
1a.Upload latest (conventional) firmware via supplied tool (ESC's have been 
selected on Pads, but used the Atmel header-tool)
1b.Upload MultiWii throttle settings
2. Removed BEMF's (from my F30 and F40's, couldn't find on TGY Plush/Sentry 
18A's)
3. Solder motors to ESC
4. Spool-up
4a.Watch (great!) throttle response
4b.Listen to annoying winding/grinding noise
4c.Shut down, check motors on SimonK ESC...
5. Relative silence!
6. Upload wii-ESC Complementary PWM version
7. Spool up
8. Scared of motors going to s**t
9. Continue flying with SimonK (for now)

Will try this with D3536 motor's I've not connected and (old) 2213's I've lying 
around. But also KDA's made same weird sound.

Normal? BTW It's not cogging, they spool-up and respond great. Either via FC or 
RX. When I say normally, initial start-up takes quite some throttle, even via 
regular RX. When throttle down, motor stops, WOT again, motor only starts after 
certain throttle point.

Have video to show this (and compare), can upload if necessary.

Original issue reported on code.google.com by shuff...@gmail.com on 17 Oct 2012 at 12:09

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Hi,

winding/grinding noise - is it on low throttle? Is it disapearing with higher 
throttle settings? Yes, video would be nice.

To start, fw requires 50 ppm frames (which is around 1 sec delay on 50hz 
receiver). This is done to prevent accidental starts when FC is rebooted.

Original comment by d.kayu...@gmail.com on 21 Oct 2012 at 6:02

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As was no response from reperter. ;)

Original comment by d.kayu...@gmail.com on 2 Nov 2012 at 6:56

• Changed state: WontFix

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Sorry, forgot to click Save when uploading video! :)

Original comment by shuff...@gmail.com on 2 Nov 2012 at 7:18

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SimonK on F30A with 2217: http://db.tt/DUqwS41I
WiiESC on F30A with 2217: http://db.tt/4HyPfdkX

Original comment by shuff...@gmail.com on 2 Nov 2012 at 8:07

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Sounds like complimentary PWM without load. ;)

Original comment by m.tes...@gmail.com on 2 Nov 2012 at 9:21

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It is! :)
But that is the 'normal' sound? It sounds so much more 'screaming' than with 
SimonK's. You can't hear the difference too good, as phone doesn't pick up the 
high frequencies.

http://dl.dropbox.com/u/9916558/SimonK%20on%20F-30A%20with%202217.mp4
http://dl.dropbox.com/u/9916558/WiiESC%20PWM%20on%20F-30A%20with%202217.mp4
http://dl.dropbox.com/u/9916558/WiiESC%20PWM%20Complementary%20on%20F-30A%20with
%202217.mp4

Original comment by shuff...@gmail.com on 2 Nov 2012 at 10:06

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Can't hear anything unusual..

Comp. pwm produces noise when it is "breaking", without load motor constantly 
accelerating-decelerating pretty much every pwm cycle. This produces whine 
depending on RPM. Under load (with prop) motor cannot accelerate so fast, this 
significantly reduces this type of noise.

SDM makes noise at low power and near 100%, this is a price for higher 
resolution and higher efficiency. But again, under load other types noises are 
much higher (prop, commutation, torque ripple, etc..)

So, can you repeat tests with prop? ;)

Original comment by d.kayu...@gmail.com on 3 Nov 2012 at 1:22

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Will try!
ESC's on heavy lift/load hexa still aren't heatshrinked so I can test
different ESC firmwares.

Original comment by shuff...@gmail.com on 3 Nov 2012 at 1:43

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Any updates on this? Can I close issue? ;)

Original comment by d.kayu...@gmail.com on 19 Nov 2012 at 6:58