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Johnw11 / arducopter

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1 of 4 motors run at slow speed #514

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Arducoper NG or ACM?
ACM

What steps will reproduce the problem?
1.Aircraft CG balance
2.Aircraft on level
3.Level Calibrated
4.Prefight test, the 4th motor of X frame (Right-Back Motor) slower than another
5.Radio bar move normally
6.Same setting on 4 motors

What is the expected output? What do you see instead?
Aircraft can hover and stay in level. But it fly in right back direction.

What version of the product are you using? On what operating system?
APM2 ,850kv motors with 10x45 props, DIY Airframe, Li-po 3s 11.1V 3000mah.
Win7 -64bit

Please provide any additional information below.

It's fly ok until i upgrade firmware to 2.8.1

Original issue reported on code.google.com by way.tawa...@gmail.com on 5 Nov 2012 at 9:40

GoogleCodeExporter commented 9 years ago 
[deleted comment]
GoogleCodeExporter commented 9 years ago 
Hi there

I have a APM2.0 running a HobbyKing 666mm frame. 1000Kva motors with 12" props. 
 2200,ah 3s 11.1v Li-Po. 

I am having the same issue as the reader above..

After upgrading the APM firmware 2 releases ago the right rear motor stopped 
mid flight and caused a very unwanted crash. 
All repaired and replaced now. 
No joy with the new release

Any help will be appreciated. 
Thank You

Original comment by fouriebrad@gmail.com on 7 Nov 2012 at 5:04

GoogleCodeExporter commented 9 years ago 
Does the issue still occur with more than 8 satellites seen?

Original comment by graham.d...@gmail.com on 18 Nov 2012 at 4:49

GoogleCodeExporter commented 9 years ago 
I'm have this issue with more than 11 satellites.
I fixed my quadrotor and test it again.
It fly ok with a little move to right-rear direction and it flip suddenly while 
tuning throttle hold KP, and i lost 1 motor and my aircraft need over-halt fix. 

So, Now i need to downgrade firmware, How to do?

Thanks for every mentions.

Original comment by way.tawa...@gmail.com on 18 Nov 2012 at 5:11

GoogleCodeExporter commented 9 years ago 
additional information:
number of gps in mission planner HUD show 65xxx>0 while gpscount in status show 
11-16

Original comment by way.tawa...@gmail.com on 18 Nov 2012 at 5:21

GoogleCodeExporter commented 9 years ago 
"65xxx>0" is distance to current waypoint / current waypoint number

Original comment by graham.d...@gmail.com on 18 Nov 2012 at 6:20

GoogleCodeExporter commented 9 years ago 
Seems a similar problem to what I am having with one motor just slowing down 
and stopping. As soon as I apply throttle it starts again only to slow down and 
stop again.

Original comment by designst...@gmail.com on 28 Nov 2012 at 9:44

GoogleCodeExporter commented 9 years ago 
after this issue happened. I try...
1. Calibration A/C only motor+arm+controller on level>>>>not fix my issue
2. Make right-rear of controller lower than other side>>>>not fix my issue
3. Adjust stabilize gain (stabilize KP,KI and Roll KP,KI)>>>>not fix my issue

Now, I have no idea what should i do?

Note: My A/C can fly in stabilize mode by move stick for a little trim it to 
level fly

Original comment by way.tawa...@gmail.com on 29 Nov 2012 at 4:47

GoogleCodeExporter commented 9 years ago 
Swop motors and ESC to opposite arm, see if problem occurs in same direction?

Original comment by graham.d...@gmail.com on 29 Nov 2012 at 5:27

GoogleCodeExporter commented 9 years ago 
@designstudioyear4,
    I think the issue is that your THR_MIN is too low or you haven't calibrated your ESCs.  What is likely happening is that your copter is on the ground and there's a small amount of heading drift (this is normal).  the APM is trying to correct this by yawing but it can't because the copter is sitting on the ground.  To yaw it will incraese the speed of two motors and decrease the speed of another two.  So that problem motor is one of the two that is slowing down.  Normally it wouldn't stop except that the THR_MIN value is below what it requires to keep the motor running.
     So can you try increasing the THR_MIN from the default of 130?  Try 150 maybe...or recalibrate your ESCs.

Original comment by rmackay...@gmail.com on 29 Nov 2012 at 11:11

GoogleCodeExporter commented 9 years ago 
Issue 523 has been merged into this issue.

Original comment by rmackay...@gmail.com on 29 Nov 2012 at 11:14

GoogleCodeExporter commented 9 years ago 
Thank you for all advances,

few hours ago i did...
1. Re-calibrated ESC ==>Not fix
2. Swop Right-rear and Left-Front (ESC+Motor)==>the Left-Front is slow and my 
copter move forward left 

So, I think my ESC is the reason of this issue and i will change that one.
i will post the result if it fixed.

Thank you all,

Original comment by way.tawa...@gmail.com on 30 Nov 2012 at 2:30

GoogleCodeExporter commented 9 years ago 
I change a new ESC but it still move to left forward direction.
I will change a new motor.

When i fly it two rear motors stop, but a bit luck to me. It stop while i fly 1 
foot altitude. So my copter is ok.

Original comment by way.tawa...@gmail.com on 30 Nov 2012 at 3:21

GoogleCodeExporter commented 9 years ago 
I changed a new motor >>> not fix
THR_MIN = 150 >>>>>>>> not fix

I check APM alignment it seems heading to 355-357 degree.

Original comment by way.tawa...@gmail.com on 30 Nov 2012 at 8:43

GoogleCodeExporter commented 9 years ago 
It's hard to be sure without seeing it (i.e. a video would help) but the copter 
moving forward-left is likely not a motor or ESC issue.  Have you tried 
autotrim to correct for slightly off center of gravity?
http://code.google.com/p/arducopter/wiki/AC2_AutoTrim

Also please remember that the copter will never completely stop like an AR 
Parrot drone.  An AR Parrot uses a camera facing downwards to stop it's 
horizontal movement and a sonar to stop it's vertical movement.

Way, can you download the dataflash logs and PM or email me?  If possible 
please turn on the MOTOR data logging.  go to the MP's terminal window, type 
"logs", "enable MOTOR".  then go fly and you should be able to download the 
logs after your flight.

Original comment by rmackay...@gmail.com on 30 Nov 2012 at 9:52

GoogleCodeExporter commented 9 years ago 
Thank you rmackay,
 I tried like your instruction but it not work .
it show like this VDO
http://www.youtube.com/watch?v=_UwnmDlS0c0&feature=youtu.be

i tried autotrim and it fly better but it trim much more than i expect, shown 
at the end of vdo
[url=http://image.ohozaa.com/view2/wuJqR6unnbLkFIXX][img]http://image.ohozaa.com
/i/c8d/fC12wb.png[/img][/url]
http://image.ohozaa.com/view2/wuJqR6unnbLkFIXX

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 4:06

GoogleCodeExporter commented 9 years ago 
Screen capture VDO while i use auto trim is here

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 5:13

GoogleCodeExporter commented 9 years ago 
http://www.youtube.com/watch?v=ZJkSvhojjbU&feature=youtu.be

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 5:13

GoogleCodeExporter commented 9 years ago 
This VDO is best flying but i hate that shown on HUD.
What should i do for solve this abnormal behavior of my copter.
http://www.youtube.com/watch?v=LPjf4rCIHQw&feature=youtu.be

The copter flying vdo coming soon.

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 6:48

GoogleCodeExporter commented 9 years ago 
Before use auto trim it fly like this VDO
http://www.youtube.com/watch?v=wIDluiMeGqM&feature=youtu.be

And after i finish tune it.
http://www.youtube.com/watch?v=BoFiIgsvpxk

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 8:40

GoogleCodeExporter commented 9 years ago 
way,
    congrats, that's looking pretty good.  i guess you're a bit of a novice pilot still but with a bit more practice you'll be able to fly it like other people do in their videos.

Original comment by rmackay...@gmail.com on 3 Dec 2012 at 9:17

GoogleCodeExporter commented 9 years ago 
Thank you rmackay,

    I'm newbie for RC , But i expect it can fly stabilize while i release my fingers from control sticks.

I tried using altitude hold but it sometimes fly higher sometimes touch the 
ground.
i don't like that fly. So i will adjust a throttle hold gain.

Thank you for all reply.
Way

Original comment by way.tawa...@gmail.com on 3 Dec 2012 at 9:28

GoogleCodeExporter commented 9 years ago 
Way,
     Try bumping up the Throttle Rate from 0.300 to 0.330.  Also if you're using a 2.5 and it's not in a case, make sure that your barometer is covered by a piece of foam or felt to protect it from the wind.  If you've got an APM 2.0 which has a daughterboard on the top then that board provides a good bit of protection.

Original comment by rmackay...@gmail.com on 3 Dec 2012 at 12:03

GoogleCodeExporter commented 9 years ago 
I'm closing this issue..hope that's ok.

Original comment by rmackay...@gmail.com on 3 Dec 2012 at 12:04