Making my own brushless for direct drive helicopter - RC Groups
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Jul 22, 2017, 04:38 PM
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Making my own brushless for direct drive helicopter


Hello everybody!
I have a project in mind of making a 450 helicopter with a main rotor direct drive. This is not new as you can see here: https://www.helifreak.com/showthread.php?t=366956

This heli uses the Himax motor used in Multiplex Funcopter an Himax Model C-6310-0225, with 225Kv and 450W!
And I was wondering if taking a motor like this one:
https://hobbyking.com/en_us/quanum-m...lt-by-dys.html, and rewinding it for my needs?

If I can I would make a 450 semi-scale Hughes 500 with direct drive and 3S batteries to sound like this:
SCHWEIZER 300C RC SCALE MODEL HELICOPTER WITH DIRECT DRIVE / Treffpunkt Modellbau Paaren 2016 (5 min 53 sec)


I hope I can count on you to tell me if I can do it or that I'm simply dreaming!

Thank you.
Luis Carreira
Portugal
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Jul 22, 2017, 05:17 PM
Wake up, feel pulse, be happy!
Piece's Avatar
I don't see why not. You'll obviously have to figure out your own shaft adapter, but as long as you pick a motor chassis that can sustain the necessary power with a low enough Kv, it should work fine.

SAB actually announced a small direct-drive 3D heli earlier this year (named Fireball, I think). That might be worth some research.
Jul 23, 2017, 07:29 AM
just look at it smokin'
z-matrix's Avatar

diy direct drive helicopter motor


Hi

something like this?
https://www.rcgroups.com/forums/show...ve-main-motors
https://www.rcgroups.com/forums/show...-finally-ready!!!

too bad it is hard to get 5.25" floppy drives nowadays...
Last edited by z-matrix; Jul 23, 2017 at 07:36 AM.
Jul 23, 2017, 02:04 PM
Registered User
Quote:
Originally Posted by Piece
I don't see why not. You'll obviously have to figure out your own shaft adapter, but as long as you pick a motor chassis that can sustain the necessary power with a low enough Kv, it should work fine.

SAB actually announced a small direct-drive 3D heli earlier this year (named Fireball, I think). That might be worth some research.
Thank you Piece.
That's what I tought, but I wanted a second opinion, just like when we go to the doctor!
I'll look into the SAB direct drive, thank you for that information.
I'll do my research and keep it posted.
Jul 23, 2017, 02:10 PM
Registered User
Quote:
Originally Posted by z-matrix
Hi

something like this?
https://www.rcgroups.com/forums/show...ve-main-motors
https://www.rcgroups.com/forums/show...-finally-ready!!!

too bad it is hard to get 5.25" floppy drives nowadays...
Hi z-matrix!
Exactly like that, I already had a look at these and the search is on!
5.25" floppy drives are dificult to find, they are not in use for at least 20 years!!!
Thanks.
Jul 24, 2017, 04:25 AM
just look at it smokin'
z-matrix's Avatar
Quote:
Originally Posted by lmccarreira
Hi z-matrix!
Exactly like that, I already had a look at these and the search is on!
5.25" floppy drives are dificult to find, they are not in use for at least 20 years!!!
Thanks.
Somebody should proceed making these laminations right?
It is low rpm high torque, and light, no gearbox needed for heli rotor direct drive.
i have 2 of them, i already proceeded to take apart one, it even has a ball bearing hub, the "bell" has to be remade though, stators can be stacked for higher power...
i am not making magnet motors anymore, i am developing SynRM-s, making prototypes outof old motors.

3.5" floppy drives have a flat outrunner bldc too, but smaller diameter and thinner, if you get like 3-9 stators stacked it might give more torque
https://commons.wikimedia.org/wiki/F...motor_open.jpg
I already planned that if i were to take more (multiples of 3) stators and rotate the stacks it would even out the "crooked" teeth, they usually have 2 this is where they fit the hall ics, (i don't like the design).
Last edited by z-matrix; Jul 24, 2017 at 04:31 AM.
Jul 24, 2017, 01:20 PM
Registered User
Quote:
Originally Posted by z-matrix
Somebody should proceed making these laminations right?
It is low rpm high torque, and light, no gearbox needed for heli rotor direct drive.
i have 2 of them, i already proceeded to take apart one, it even has a ball bearing hub, the "bell" has to be remade though, stators can be stacked for higher power...
i am not making magnet motors anymore, i am developing SynRM-s, making prototypes outof old motors.

3.5" floppy drives have a flat outrunner bldc too, but smaller diameter and thinner, if you get like 3-9 stators stacked it might give more torque
https://commons.wikimedia.org/wiki/F...motor_open.jpg
I already planned that if i were to take more (multiples of 3) stators and rotate the stacks it would even out the "crooked" teeth, they usually have 2 this is where they fit the hall ics, (i don't like the design).
Hi!
Great idea to stack stators that are easy to find, more or less, to have more torque.
Your direct drive helis continued to be collective pitch or fixed?
What kind of head speed they have?
Well, I looked SynRM, and it's another world!!!
Thanks.
Jul 26, 2017, 03:15 PM
Registered User
Quote:
Originally Posted by Piece
I don't see why not. You'll obviously have to figure out your own shaft adapter, but as long as you pick a motor chassis that can sustain the necessary power with a low enough Kv, it should work fine.

SAB actually announced a small direct-drive 3D heli earlier this year (named Fireball, I think). That might be worth some research.
I saw the small SAB Fireball.
What a crazy little machine!
Thanks for the info.
Jul 27, 2017, 12:01 PM
Registered User
Fourdan's Avatar
Quote:
Originally Posted by lmccarreira
Hello everybody!
I have a project in mind of making a 450 helicopter with a main rotor direct drive.
This heli uses the Himax motor used in Multiplex Funcopter an Himax Model C-6310-0225, with 225Kv and 450W!
And I was wondering if taking a motor like this one:
https://hobbyking.com/en_us/quanum-m...lt-by-dys.html, and rewinding it for my needs?
Luis Carreira
Hi Luis
The Multiplex Himax C-6310-225 is determined by
Weight 235g
Kv 225 rpm/V
Shaft 4mm
The Quanum MT 5206 is lighter = 162g

Better to find a motor close to 235-250g and rewind for the desired Kv
Scorpion has the M4215-320 weight 227g
Class stator "3525" are weighing about 250g (Dualsky XM4255EA-x)
or Turnigy Multistar 3525-750Kv 14Pole Multi-Rotor Outrunner, 233g
Class stator "4020" are weighing about 300g (Scorpion discontinued S4020-10 @ 70$ could be a good bargain)
http://www.scorpionsystem.com/catalo...0_1/S-4020-10/
Louis
Last edited by Fourdan; Jul 27, 2017 at 12:13 PM.
Jul 27, 2017, 02:20 PM
Registered User
Thank you Fourdan for your opinions.
Yesterday I was able to buy the Himax motor upgrade from the funcopter with 250Kv.
I think I'm going to try this and then make my own!
Thanks.
Luis Carreira
Jul 30, 2017, 04:22 PM
Night Flying
Ron H's Avatar
Some fairly large stators can be found in VCR's if you can find them. The reader and the drive often have reusable stators.
Jul 30, 2017, 04:56 PM
Registered User
Hello Ron H!
I'm trying to get my hands on those because I remember seeing a large stator a long time ago when I opened one VCR, but I wasn't into motor building back then!
Thank's.
Aug 29, 2017, 10:36 AM
Registered User
Hi guys,
how do you think the motor rctimer 5010 260kv is suitable for t-rex 450?

Specifications:
KV: 260
Configuration: 12N14P
Shaft Diameter(inside size): 5mm
Motor Dimension(Dia.*Len): Φ50х26
Weight(g): 100g
ldle current(10)@10v(A): 0.4A
No.of Cells(Lipo): 4-6S
Max Continuous current: 20A
Max Continuous Power: 450W

I like it so that it has a light weight and the diameter of the shaft coincides
Last edited by flenger; Aug 29, 2017 at 10:51 AM.
Aug 29, 2017, 10:52 AM
Registered User
Fourdan's Avatar
Quote:
Originally Posted by flenger
Hi guys,
how do you think the motor rctimer 5010 260kv is suitable?

Specifications:
KV: 260
Configuration: 12N14P
Shaft Diameter(inside size): 5mm
Motor Dimension(Dia.*Len): Φ50х26
Weight(g): 100g
ldle current(10)@10v(A): 0.4A
No.of Cells(Lipo): 4-6S
Max Continuous current: 20A
Max Continuous Power: 450W

I like it so that it has a light weight and the diameter of the shaft coincides
Hi
The Multiplex Himax C-6310-225 is determined by
Weight 235g
Kv 225 rpm/V
Shaft 4mm

IMHO
Kv 260 rpm/V (higher than 225) is too high (rotor power is proportional to Kv^3, given the voltage)
weight 100 g (lower than 235) is too small
You could go to the "magic smoke" with 3S and your heli rotor
Louis
Sep 28, 2017, 04:25 AM
Registered User
Quote:
Originally Posted by Fourdan
Hi
The Multiplex Himax C-6310-225 is determined by
Weight 235g
Kv 225 rpm/V
Shaft 4mm
Hi Fourdan,

Thanks for the answer,
Maybe you know or tell me where to look.
What stator is used on this motor, the number of magnets, the number of turns and the thickness of the wire?
I have a large number of different stators and I plan to make a motor similar to this, I do not have the necessary information


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