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Author Topic: Brushless gimbal motor configurations  (Read 84858 times)

Coyote

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Brushless gimbal motor configurations
« on: February 24, 2013, 10:52:05 PM »

I thought I`d put a thread up to collect different motors used / windings / wire diameter etc and what cameras they can cope with. I think it will be a usefull resource.

Winding techniques for different motors :

Pancake 24n28p                                                                                                   Standard 12 pole :
   


Ill start it off :

Turnigy 5014
.2 wire
150 turns
15 ohm

Tested on Sony Nex 7

Rewound Turnigy 5014


Alexmos SBGC with Sony Nex 7



Smartdrones 4404
12N/14P
0.15mm
300 winds
36.2 ohms
Tested on 400g camera and a Canon 55D

brushless test w



RcTimer HP4215 18 stator 24 pole
80 turns


Brushless Gimbal Test 4215 80 Turn


Here are some brushless gimbal motor suppliers now getting into the game :

Altitude Hobbies :

2208 0.16mm 80 turns for GoPro

3508 0.21mm 130 turns for Nex 5N

4006 0.136mm 150 turns for Nex 5 size

Tiger

4006 0.18 120 turns

2208 0.18 80 turns

iFLIGHT

4006 0.21mm 150 turns Nex 5 size

2208 0.16 80 turns GoPro size

5206 0.21mm 150 turns DLRS size

4008 0.21 150 turns Nex 6 / 7 size

3508 0.21 130 turns 200 - 400g camera

2212 0.16 80 turns GoPro size
« Last Edit: March 20, 2013, 11:10:21 PM by Coyote »
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #1 on: February 24, 2013, 11:19:03 PM »

For my first gimbal I have

RCTimer 2830 750KV
0.18mm
60 winds
10.4 ohm over two phases

For : Gopro 1 / 2 - yet to be tested

Already tested here :

test 5
« Last Edit: February 26, 2013, 01:54:36 AM by Coyote »
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wgt40w

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Re: Brushless gimbal motor configurations
« Reply #2 on: February 24, 2013, 11:26:07 PM »

Coyote

Apart from altering the gauge of wire used and the number of turns wound, could you in theory fine-tune a brushless 'gimbal motor' by varying the supplied voltage ??
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #3 on: February 24, 2013, 11:46:58 PM »

Coyote

Apart from altering the gauge of wire used and the number of turns wound, could you in theory fine-tune a brushless 'gimbal motor' by varying the supplied voltage ??

Varying the voltage varies the torque too yes, the wire diameter and number of turns dictates the resistance and torque to begin with, then the higher the voltage the more torque
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #4 on: February 24, 2013, 11:47:31 PM »

:Dumbfolded:  The last video shows the motor working with all the wires going to the motor are not insulated, how the hell does this work?

The wires are enameled Andy, they are insulated
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #5 on: February 26, 2013, 01:53:38 AM »

More motors :

Emax 2822
12N/14P
0.15mm
70 turns
18.9 ohms
Tested on 150 grams of camera weight


RCTimer 5010
http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=575&productname=
0.18mm
130 turns = 14 ohms
150 turns = 17 ohms
170 turns = 20 ohms

MVI 9977




Turnigy 2204 14T 19g
http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=509&productname=
0.14mm
100 turns
14 ohms

Used as pitch in this video
test3



BC3536
http://www.rctimer.com/index.php?gOo=goods_details.dwt&goodsid=509&productname=
0.2
65 turns

test Brushless Direct Drive Gimbal




Hobbyking 2818 1350 KV
http://www.hobbyking.com/hobbyking/store/__17588__HobbyKing_2818_Brushless_Outrunner_1350KV.html
0.14mm
70 turns
15 ohms

MVI 6221




Tmotor MT2208
http://www.rctigermotor.com/show.php?contentid=150
0.15mm
70 turns
15 ohms




« Last Edit: February 26, 2013, 02:08:04 AM by Coyote »
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dirtyharry

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Re: Brushless gimbal motor configurations
« Reply #6 on: February 26, 2013, 02:04:45 AM »

do you have to rewire the motor to make these new gimbals work?

if so is it a change in phases on the windings or an increase in turns + larger swg to get the current down?
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #7 on: February 26, 2013, 02:09:36 AM »

Yes you do, you rewind them in Wye format.

The winding are of thinner wire with more turns for a higher resistance which gives more torque for less current in the range required for the gimbal operation
« Last Edit: February 26, 2013, 02:12:55 AM by Coyote »
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dirtyharry

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Re: Brushless gimbal motor configurations
« Reply #8 on: February 26, 2013, 02:18:40 AM »

I guess you need a certain amount of poles to make it work then.

what is the ideal amount of poles,  and can you limit the current through the software or  a resistor ?

I'm guessing this is the way forward with camera gimbals , and once an ideal configuration is realised it could be ridiculously cheap to make.

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Coyote

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Re: Brushless gimbal motor configurations
« Reply #9 on: February 26, 2013, 09:10:22 AM »

I guess you need a certain amount of poles to make it work then.

what is the ideal amount of poles,  and can you limit the current through the software or  a resistor ?

I'm guessing this is the way forward with camera gimbals , and once an ideal configuration is realized it could be ridiculously cheap to make.

So far basically any motor configuration can be used, most prefer 24n24p because the cogging is reduced. Lower KV the better as well.

The current is limited by the software, you tune it so it can hold its position fine without running hot.

Quote
i fear i may have to eat my words after previously saying this was an expensive gimmick that would not be as good as servo,s ...... all looks very impressive.

Now wish i had the skills and patience to something like a brushless gimball

Aitch :laugh:

With motors being as cheap as $20 ( depending on setup, ) controllers from $50 to $150 and a gimbal frame chances are yes your gonna :)

Once they get it all sorted out ( early days ) then it will be available in kit form soon enough.
 
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #10 on: February 26, 2013, 09:32:11 AM »

The drivers are rated for 2 amps each max current
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Coyote

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Re: Brushless gimbal motor configurations
« Reply #11 on: February 26, 2013, 12:24:40 PM »

In theory not much I would think, the gimbals should be very well balanced on each axis, so gravity will help a lot to reduce the load, then the motors should not be running any where near full power either in most situations.

Lets say that for example the flight time of the craft is 10 mins, both motors are running at 50% power giving 2 amps load, that`s only 333mah used in the flight to run the gimbal during the flight. At full power 666mah.

You could if you wanted to keep every mah for flight use a 500mah lipo adding just  57g of weight.

Quote
people far more knowledgeable than myself on many forums were saying that this was not going to be possible and telling people to just buy servo's or to use expensive and heavy 2 phase stepper motors or to use geared systems with brushless motors.

The world full of armchair internet experts, then there`s people who do it and prove they are not as knowledgeable as they`d like to think they are :)
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Asomaro

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Re: Brushless gimbal motor configurations
« Reply #12 on: February 26, 2013, 12:25:19 PM »

Just a heads up - we have completed the layouts for the alex moss controller (real name Aleksey Moskalenko) and have most things set for manufacture here in the UK. We are working with Aleksey on this directly.

We are now waiting for some pre-production boards so that they can be tested to ensure we are happy with the design and function. I hope (if all goes well) to hit the go button on manufacture by the end of March for availability somewhere in May.

In addition I am talking to some motor manufacturers about pre-wound motors for the gimbal.

IMPORTANT: I'm looking for a couple of people that have the wherewithal to test the boards, so if you already have special wound motors and perhaps some kind of gimbal platform which could take advantage of the Alex Moss controiller - then drop me a pm with your details.

All good fun.

Cheers,
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dogzilla

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Re: Brushless gimbal motor configurations
« Reply #13 on: February 26, 2013, 09:51:51 PM »

how long before motors are available pre wound for this purpose i wonder? shouldnt cost anymore than the standard motors, then it becomes cheap and simple, ????

Take em about 5 minutes, soon as the chinese manufacturers get whiff of a market they will be all over it.

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Coyote

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Re: Brushless gimbal motor configurations
« Reply #14 on: February 26, 2013, 11:23:22 PM »

But have you found any actually for sale yet Aitch ? I cant find any at all, just pre-orders
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