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Old Nov 29, 2015, 03:55 PM
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Quote:
Originally Posted by OlliW View Post
bill glover was so kind to work himself through the above data recording procedure, and transfered the files to me, yielding the motor plots below

I can't yet tell too much as regards conclusions since there are still quite too few comparison experiments
one thing however strike me, namely that the yaw motor seems to be surprisingly smooth ...

bill: what had been your battery voltage, and the Vmax values for the three axes?
Supply was around 11.5V (partially discharged 3S 8000 mAh) and vmax values were:

pitch - 50
roll - 70
yaw - 200

I still need to do a little more tuning.

The pitch and roll 2206s are Turnigy from Hobby King:

http://www.hobbyking.com/hobbyking/s...strSearch=2206

The 2804 on yaw is the one from the GoodLuckBuy GoPro 3D gimbal. I think this now comes with these motors on all axes but my early one had 2208s on pitch and roll instead.
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Old Nov 30, 2015, 07:25 AM
DJI27 is offline
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Originally Posted by OlliW View Post
just in case it might be of interest:
I've started collecting info on available motors suitable for Mobius gimbals, http://www.olliw.eu/2015/mini-micro-gimbal-motors/
Helpful list.... thank you

I've more or less selected either the AX 2206 140KV or the Walkera WK-WS-22-001 for my gimbal.

Is there any particular rationale behind choosing different motors for each axis or can all 3 axes have the same motor?
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Old Nov 30, 2015, 11:43 AM
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Originally Posted by DJI27 View Post
Is there any particular rationale behind choosing different motors for each axis or can all 3 axes have the same motor?
You generally need more power on the yaw axis, so the pitch & roll motors can be smaller (saving some weight).
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Old Nov 30, 2015, 11:44 AM
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Quote:
Originally Posted by DJI27 View Post
Helpful list.... thank you

I've more or less selected either the AX 2206 140KV or the Walkera WK-WS-22-001 for my gimbal.

Is there any particular rationale behind choosing different motors for each axis or can all 3 axes have the same motor?
Saving weight would be one. The motors closer to the Mobius need the least torque (since the amount of weight to stabilize is small), the yaw motor is the one that needs to be the strongest. Also, the lighter the motors closer to the Mobius, the smaller you need the yaw motor to be.

2206 motors are really big for a Mobius, something much smaller would suffice

If you use 2206 motors that weight 40g, probably weight is not your main concern. But a 2206 as a yaw motor having to stabilize more than 120g might be pushed hard (4 2206 motors plus the Mobius, plus the mechanical components). That same 2206 with much lighter motors might work. Needless to say, heavier motors mean heavier arms, to avoid flex and vibrations... so weight increases rather fast when you start using 2206 motors.

Which is not to say it won't work, there are plenty of 2D GoPro gimbals using 2206, so roll and pitch will be ok. Yaw might be the one to keep an eye on
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Old Dec 01, 2015, 11:17 AM
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Quote:
Originally Posted by Bill Glover View Post
You generally need more power on the yaw axis, so the pitch & roll motors can be smaller (saving some weight).
Yeah ... one of my goals is to keep gimbal weight as low as possible while still providing enough strength & rigidity.

What you've said is kind of redirecting my thinking though....
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Old Dec 01, 2015, 11:32 AM
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Originally Posted by robca View Post
Saving weight would be one. The motors closer to the Mobius need the least torque (since the amount of weight to stabilize is small), the yaw motor is the one that needs to be the strongest. Also, the lighter the motors closer to the Mobius, the smaller you need the yaw motor to be.

2206 motors are really big for a Mobius, something much smaller would suffice

If you use 2206 motors that weight 40g, probably weight is not your main concern. But a 2206 as a yaw motor having to stabilize more than 120g might be pushed hard (4 2206 motors plus the Mobius, plus the mechanical components). That same 2206 with much lighter motors might work. Needless to say, heavier motors mean heavier arms, to avoid flex and vibrations... so weight increases rather fast when you start using 2206 motors.

Which is not to say it won't work, there are plenty of 2D GoPro gimbals using 2206, so roll and pitch will be ok. Yaw might be the one to keep an eye on
Since weight is a top consideration for me, it looks like I need to learn a lot more about motors.... I'm beginning to see how everything abot the Mobius complicates what should be a rather straight forward gimbal design.
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Old Dec 10, 2015, 11:20 PM
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Deleted Wrong Thread sorry
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Old Dec 29, 2015, 11:54 AM
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Looks good, 113€, 200g weight of Mobius included, 3 axis, rail for easy remove.
http://www.hobbyking.com/hobbyking/s...ed_Gimbal.html
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Old Dec 29, 2015, 06:56 PM
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Originally Posted by SilbernerSurfer View Post
Looks good, 113, 200g Mobius included, 3 axis, rail for easy remove.
http://www.hobbyking.com/hobbyking/s...ed_Gimbal.html
Looks interesting.
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Old Dec 30, 2015, 02:42 AM
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Camera not included is depicted on the first image
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Old Dec 30, 2015, 06:53 AM
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Hard to be sure but it looks like it uses the suspension spheres in tension rather than compression, which isn't ideal.
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Old Dec 30, 2015, 10:22 AM
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Originally Posted by oxygen View Post
Camera not included is depicted on the first image
I mean, 200g, weight of Mobius included!
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Last edited by SilbernerSurfer; Jan 03, 2016 at 05:52 AM.
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Old Jan 04, 2016, 08:38 AM
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Originally Posted by SilbernerSurfer View Post
Looks good, 113, 200g weight of Mobius included, 3 axis, rail for easy remove.
http://www.hobbyking.com/hobbyking/s...ed_Gimbal.html
Forgotten to mention, different motors. Maybe this is one reason for the light weight.

Copy/Paste from HK:
X,Y axis: 18 series motors
Z axis: 22 series motor
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