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Author Topic: Stuttering motor on idle.  (Read 332 times)

Offline Andy7

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Stuttering motor on idle.
« on: May 14, 2018, 11:48:47 »
Noticed yesterday that one of my motors is stuttering on idle when I arm.
Goes away as soon as I put any throttle in, and hovers perfectly.
I had an unexpected flip-out on Sunday, though I think that may have been a failsafe due to a chewed antenna.

Possible sign of an ESC beginning to go bad? Spedix ES20s.
Motor spins freely, no dirt in it, props on tightly.
ZMR200 | EMAX 2206 2300kv | XSRF4PO(BF) | FatShark Dom V3 | Spedix ES25 | 4S 1300mAh | 5045x3 PC HQ Props | FrSky QX7.
Hubsan X4 107 V2
YouTube: www.youtube.com/user/AndySevern7

Offline Lamaule

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Re: Stuttering motor on idle.
« Reply #1 on: May 14, 2018, 11:53:34 »
Recalibrate your escs and make sure your idle up is high enough to spin all of them reliably. Props off while you're doing it!

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Offline Andy7

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Re: Stuttering motor on idle.
« Reply #2 on: May 14, 2018, 12:06:31 »
That was my initial thought - but do you NEED to recalibtate for OneShot / Dshot? Thought it was all digital?
ZMR200 | EMAX 2206 2300kv | XSRF4PO(BF) | FatShark Dom V3 | Spedix ES25 | 4S 1300mAh | 5045x3 PC HQ Props | FrSky QX7.
Hubsan X4 107 V2
YouTube: www.youtube.com/user/AndySevern7

Offline Lamaule

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Re: Stuttering motor on idle.
« Reply #3 on: May 14, 2018, 12:10:36 »
Yeah, but I'd still start there. I've had some weird stuff happen in the past where settings have changed.  Occasionally I have had crashes where I have had had to reflash firmware. I think jakalas has had the same too.
That was my initial thought - but do you NEED to recalibtate for OneShot / Dshot? Thought it was all digital?

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Offline Cheredanine

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Re: Stuttering motor on idle.
« Reply #4 on: May 14, 2018, 12:46:26 »
To be specific, you need to calibrate for oneshot/multishot, they are not digital. Dshot calibration doesn’t do anything.
Agree with firmware reflash, I have had crashes where doing that fixed issues
Other common causes -
mounting screws touching the windings.
Esc problem
Min_command too high
min-throttle/digital idle (one shot/dshot) too low
(Both of those should be fixed if you reflash)
Electrical short

Offline Andy7

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Re: Stuttering motor on idle.
« Reply #5 on: May 14, 2018, 13:35:55 »
Running DSHOT 600. Motor idle throttle, set to 4.5% (8k Gyro, 2k PID loop)
All motors stutter at 1008... which is fair enough,
Stable at 1014


Armed on the bench (yep, no props!) seems fine.
Taking it out to the garden for a try.

ZMR200 | EMAX 2206 2300kv | XSRF4PO(BF) | FatShark Dom V3 | Spedix ES25 | 4S 1300mAh | 5045x3 PC HQ Props | FrSky QX7.
Hubsan X4 107 V2
YouTube: www.youtube.com/user/AndySevern7

Offline Andy7

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Re: Stuttering motor on idle.
« Reply #6 on: May 14, 2018, 13:43:06 »
Hmmm... right as rain.  :hmm:

Only thing I did was to recalibrate the acc.
Must have just wanted some attention.  :shrug:
ZMR200 | EMAX 2206 2300kv | XSRF4PO(BF) | FatShark Dom V3 | Spedix ES25 | 4S 1300mAh | 5045x3 PC HQ Props | FrSky QX7.
Hubsan X4 107 V2
YouTube: www.youtube.com/user/AndySevern7

Offline Lamaule

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Re: Stuttering motor on idle.
« Reply #7 on: May 14, 2018, 15:54:02 »
Glad you've sorted it! 
Hmmm... right as rain.  :hmm:

Only thing I did was to recalibrate the acc.
Must have just wanted some attention.  :shrug:

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Offline Andy7

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Re: Stuttering motor on idle.
« Reply #8 on: May 14, 2018, 16:17:32 »
Ahhh... but there's only ONE way to be TOTALLY sure that it's working properly. #sendit

 ::)
ZMR200 | EMAX 2206 2300kv | XSRF4PO(BF) | FatShark Dom V3 | Spedix ES25 | 4S 1300mAh | 5045x3 PC HQ Props | FrSky QX7.
Hubsan X4 107 V2
YouTube: www.youtube.com/user/AndySevern7

Offline Lamaule

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Re: Stuttering motor on idle.
« Reply #9 on: May 14, 2018, 16:19:56 »
Ahhh... but there's only ONE way to be TOTALLY sure that it's working properly. #sendit

 ::)
No video, no proof!

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