problem on motor speed

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carter
Posts: 18
Joined: Tue May 22, 2012 2:50 am

problem on motor speed

Post by carter »

hello again

I just recently flashed to the latest dev, broken a prop at slow lift-off because of unbalanced speed (Clueless).. connected to GUI to monitor, and here is what I see...

Image

http://i46.tinypic.com/2qkhxm0.jpg

board is level, as shown in the GUI.. why are the FRONT_R and REAR_L different values? esp the REAR_L?

when I go for max throttle, it looks like the REAR_L is deprived..the rest goes to a max of 1800, REAR_L about 1400...

thanks
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timecop
Posts: 1880
Joined: Fri Sep 02, 2011 4:48 pm

Re: problem on motor speed

Post by timecop »

Look at your RC input graphs.
They aren't anywhere near being centered at 1500.
Thats why.
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carter
Posts: 18
Joined: Tue May 22, 2012 2:50 am

Re: problem on motor speed

Post by carter »

ok. thanks for the reply.. uhmm how would I center them? sorry but newbie here..
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keukpa
Posts: 7
Joined: Thu Jun 14, 2012 8:43 pm

Re: problem on motor speed

Post by keukpa »

dongs wrote:Look at your RC input graphs.
They aren't anywhere near being centered at 1500.
Thats why.


On version 1.9 SE of MultiWii I have pretty much the exact same problem. My Pitch, Yaw, and Roll are all centred at 1500, however, when I drive up my throttle FRONT_R rises to 1800+ and FRONT_L & REAR_R get some towards 1600+ increase, but REAR_L pretty much doesn't move at all!!

Any ideas?

The copter is all levelled and centered, etc.

Many thanks,

Keukpa
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kungrc
Posts: 1
Joined: Sat Jan 07, 2012 7:33 am

Re: problem on motor speed

Post by kungrc »

Hi, I have a problem with multiwii as well. Do you know how to fix it. Please tell me what
Thank you.
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carter
Posts: 18
Joined: Tue May 22, 2012 2:50 am

Re: problem on motor speed

Post by carter »

ok.

try this: adjust you pitch/roll I-D to ZERO (GUI)... and see if it helped... try "switching" from ACRO to STABLE mode in your TX if the 4 motor values are as close as possible to eacg other.. say 20-30 difference...
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chenkingwen
Posts: 7
Joined: Tue Mar 12, 2013 6:09 am

Re: problem on motor speed

Post by chenkingwen »

I have the same problem.How do you solve it.thankyou!!!!
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ronco
Posts: 317
Joined: Thu Aug 18, 2011 2:58 pm

Re: problem on motor speed

Post by ronco »

Hi,

this is knowen and no problem or bug. if you have the board on your desc without motors and propellers. MWC will try to correct the smallest sensor noise. and because it dont gets an reaction of a changed throttle set , the PID controller will increase the throttle output more and more. if you set P and I to 0 of roll pitch and yaw, all outputs will be the same.

in flight MWC will get the response of a throttle change and there will be no wrong output.

regards

felix
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