Motors for DJI F550

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Motors for DJI F550

Postby kenkik » 08 May 2013 12:02

The motors (or motor-shafts) on my DJI F550 make vibrations, which lead to 'jello' in the GoPro video-recordings. My goal is to make smooth, good-looking aerial video, but that's not happening with these vibrations.

So I'm looking for 6 new motors.
They must have: high quality - low weight - and no vibrations.

The F550 has a total weight of app. 2900g and use 10" props. I guess the motors should be in the 700-800 kV range.

I've been looking at Tiger Motors MT and MN Series, but have very little experience in this area. So I hope for recommendations from other users in this forum.

Which of these motors is the best for the job..? What are the differences..? Is there a better alternative..?
- T-Motor MT2212-16 750kV 55g
- T-Motor MT2216-11 900kV 75g
- T-Motor MN3110-15 780kV 80g
- T-Motor MN3508-16 700kV 82g

I'm also thinking about propellers. Which type is the best, and what are the differences..?
- Graupner E-Prop 10x5" (used now)
- APC SlowFly 10x4.7"
- T-Motors Carbon fiber prop 10x4.5"

The F550 arms can fit max. 10" props - but maybe I should even buy arm-extension-plates, and go for 11" props..?

A big thanks in advance for your replies and advice..

Best regards,
Kenneth
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Attachments
f550_avatar.jpg
DJI F550 - Total weight app. 2900g
f550_avatar.jpg (43.91 KiB) Viewed 4088 times
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Re: Motors for DJI F550

Postby LenzGr » 11 May 2013 23:52

Are you sure it's the motor shafts and not un-balanced propellers that cause the vibrations? Before going with new motors, I suggest checking that all props are properly balanced.
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Re: Motors for DJI F550

Postby kenkik » 12 May 2013 00:27

LenzGr wrote:Are you sure it's the motor shafts and not un-balanced propellers that cause the vibrations? Before going with new motors, I suggest checking that all props are properly balanced.


Hi LenzGr.

Good call - but I have already balanced all my Graupner 10x5" E-Props with a 'TopFlite Magnetic Balancer' and sandpaper. So the props are fine..

When spinning the motors (one at a time, without props) and touching the shafts lightly with a finger, I can feel the vibrations. I have also tested the motors by placing my iPhone with iAccelorameter app. on each F550 arm (again without props), and it also shows vibrations.

And I have not recieved proper help from the original motor supplier, so now I'm looking for new motors..

Best regards,
Kenneth
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Re: Motors for DJI F550

Postby LenzGr » 12 May 2013 00:43

OK, just making sure :)

I admit I have no personal experience with any of the components you are evaluating. What I've learned is that the T-Motor MN series are specially designed for aerial photography:

http://www.rcgroups.com/forums/showthread.php?t=1766424

So these models may be a better fit for your purposes, especially in combination with the T-Motors carbon props.
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Re: Motors for DJI F550

Postby kenkik » 16 May 2013 11:50

Ok, not much good advice in this forum - apart from LenzGr reminding me to balance the props..

In the last days I refined my motor-wishlist to..:
- T-Motor MT2212-16: Small, light and cheap. But not sure if it can handle 3kg.
- T-Motor MN3110-15: Very nice product picture of this motor with carbon-props. But I'm not ready for the cost of carbon props.
- Kopterworx KW2 Pro: A nice blend of weight, power and price. The producer brags about the quality being equal to AXi.
- AXi 2217/20: Small, light, powerful and top quality. But very expensive..

I ended up buying 6x..:
- Kopterworx KW2 Pro 840kV 80g motors.

I've already mounted them on my F550 and done a little testflight. They are indeed small, but the power seems adequate for the craft. And, best of all, they have no vibrations at all - all the jello in my video is gone..!!

So I'm very pleased with them.. Thread closed..

Best regards,
Kenneth
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Re: Motors for DJI F550

Postby LenzGr » 16 May 2013 13:03

Hi Kenneth, thanks for the update. Good to hear you were able to resolve your vibration issues.
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Re: Motors for DJI F550

Postby Flyduino_Paul » 18 May 2013 02:21

Kopterworx Motors are Tiger to my knowledge ;)
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Re: Motors for DJI F550

Postby aaagul45 » 13 Dec 2014 07:15

When spinning the motors (one at a time, without props) and touching the shafts lightly with a finger, I can feel the vibrations. I have also tested the motors by placing my iPhone with iAccelorameter app. on each F550 arm (again without props), and it also shows vibrations.???
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Re: Motors for DJI F550

Postby kenkik » 16 Dec 2014 00:36

Hi aaagul45.

Vibrations in the motor could come from the shaft - or unbalance in the motor-house itself.
You should consider changing the motors to new ones of better quality..

But you can also try to balance your current motor-houses. This is how to do it..:
- First, look at the motor from the top. It's round and you can divide it into 8 sections of 45 degrees.
- Use a crayon or similar to mark the sections.
- Now, cut a small piece of tape (like 2-3 layers of gaffa/duckt-tape, size 1x1cm.).
- The tape will act as a weight that you can move around.
- Stick the tape on the side of the motor, in your first section.
- Start the motor and test if the vibrations are bigger/smaller (write it down, fx. a number from 1-5).
- Move the tape to the next section.
- Repeat the test motor/move tape steps for all 8 sections.

After this you have 8 numbers written on your paper. Hopefully one section has a lower number than the others.
Place the tape in the 'sweet' section again - and test it with more or fewer layers of tape (to change the weight).

Now you have balanced the motor as good as it can get. If this is acceptable, then leave the tape there. If not, then buy new motors..

Best regards,
Kenneth
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