On 11/18/2022 at 3:05 AM, msk6003 said:

Because servo motor has controller inside of it's casing. And RC servo and lego servo's work is very different. RC servo work by PWM signal from receiver but lego servo is work by voltage level from receiver. This is why lego servo has 4 wire and cause use voltage level insted direct PWM, receiver can easily control all motors by simply regulating the voltage without having to detect which motor is connected.

Thanks for the explanation, this is something I expected after reading up a bit on how PWM control works. Now I understand why lego chose this mode of control for its servo, because it needs to be able to control all motors the same way.

Thanks @pow and @2GodBDGlory for the experiences, so I gather from the discussion that this might work for a single RC or XL motor or even probably 2L motors running from a 2S lipo or from a 9V battery even if controlled by an ESC. Those should not draw too much current, right? The main idea was actually to use the geekservo in smaller builds.

On 11/18/2022 at 8:15 AM, pow said:

@2GodBDGlory This chart from the link above shows that the current increases with higher voltages (but not much to be honest).

5292	Torque	Rotation speed	Current	Mechanical power	Electrical power	Efficiency
4.5 V	5.7 N.cm	150 rpm	1.36 A	0.87 W	6.12 W	14 %
6 V	5.7 N.cm	380 rpm	1.38 A	2.27 W	8.28 W	27 %
7.5 V	5.7 N.cm	580 rpm	1.37 A	3.45 W	10.3 W	34 %
9 V	5.7 N.cm	780 rpm	1.40 A	4.61 W	12.6 W	37 %
10.5 V	5.7 N.cm	1030 rpm	1.46A	6.16 W	15.3 W	40 %

i wonder why the stackable plugs for the buggy motors were allowed to be used at all.

Great work. Thank you for sharing. Philo compared many lego motors a while back (philohome.com). It might be worthwhile to consolidate your data with his for a good reference to all of us. Cheers.

What i have learned from this topic is that geek servos are meant for RC. I thought they have to be used with Lego PF.

But @FriedlS has some interesting point: The buggy motors produce a lot of heat. If that heat is able to escape within the cables into the (melting) plug. This could worsen the heating issues even more. So air-streaming the plug and cables might be clever. @2GodBDGlory That could also be a good question to start a new topic with: How to keep buggy motors cool?...

@DrJB the chart was copied from philohome. It's mentioned somewhere in the comments.

Best wishes and a good start into the week.

Edited November 22, 20222 yr by pow

It would honestly be really interesting to have an active cooling fan do anything on a Lego model! I'm not sure if it could be made effective enough to work well with high-current plugs, but it'd be cool to try. I just upgraded to heavy-duty plugs ripped out of old hoverboard parts I had lying around, which is a reliable but boring solution...

On 16/11/2022 at 19:49, FriedlS said:

Merci beaucoup!
 

vous pouvez voir les pièces électroniques ici (sauf le servo geek changé):

J'utilise un récepteur par exemple Radiolink et un esc où vous pouvez connecter la batterie au moteur. Dans mon cas, j'ai changé les fils du moteur en connecteur bec pour l'esc.

Je n'ai jamais essayé de connecter un servo Lego avec ce récepteur, donc je ne peux pas dire comment les fils doivent être changés. Geek servo a trois fils (+, -, s), lego servo en a quatre.

J'espère que cela vous sera utile.

Merci beaucoup!
Il y a une photo ci-dessous, quel détail voulez-vous savoir ?

Thanks FriedlS

Edited April 9, 20231 yr by BX_ARC

2 hours ago, BX_ARC said:

Bonjour FriedlS

Hello and welcome to EB.

Please take some time and read the site guidelines you agreed to upon registering, about language and image uploading.
English is mandatory and you need to use external hosting site to host and link pictures here.
Thanks and have fun.

What wheels does it use?

5 hours ago, Blake exe said:

What wheels does it use?

In this car i use different version of this one:

The wheel shown above has got a diameter of 43mm and in my G-Class they have got a diameter of 49mm.

I found them on shapeways and ordered there.