3DOF - C1500´s first Sim Seat

The shaft connection can use soft connection, which can reduce the influence of center error.

Hi noorbeast

Here are my settings:
All SMC3 are the same:

This are my SimTool settings:

And these are the Settings in FlyPT Hexpod Interface:


I´ve also tried teh following SMC3 settings:
Kp 170 / Ki 5 / Kd 0 / Ks 1
But the non synchronous running motors are the same.
Only by slow movement, the motors are moving synchronous.
It really seams that motor 1 gets first data and motor 6 the last and so 1 is a lot before 6

Hope you can help me

kind regards
Peer

Hi czgui
I´ve changed from the normal potis to hal-poti with 5V output
Also i modified the motor so i can read the position on the back side.

This works very good.

But i also pimpt my IBT_2 ;o)
At the Input is a 8200µF 50V Cap and directly on the 2x BTS7960B are 680µF 50V low ESR.
Witch this modification i´ve never seen any over current at my power supply anymore.
It looks like this:


kind regards
Peer

Hello C1500
The IBT_2 output plus bulk capacitor filtering is a good idea. In this way, it can ensure the current dynamics, effectively absorb the current fluctuations, and stabilize the 12V voltage. Ensure that the motor is working properly. This practice is very common in audio amplifiers.

Hi czgui
It´s not the output, it´s the input ( between pin 1 and 7) of the BTS7960B.

I´ve tested it the last hour with extreme movements.
But i guess the 8200µF are not enough.
Under really fast movements the power supply is still going to over current.
Next idea are 6 instead of 3 PS or a bigger 12V Buffer like a supercap or a battery.
Maybe something like this: https://de.farnell.com/cornell-dubilier/dcmc383u050bb2b/aluminum-electrolytic-capacitor/dp/4611512
But ~50€ is not really cheaper than another PS

kind regards
Peer

Hello C1500
Looking forward to your test results, your ideas are very new.

Hi

let´s try a new way

I ordered some of these:

Its a 16V SuperCap with 20F (twenty Farad) and made out of 6 2,7V 100F SuperCaps.

This should help against the "over current power supply problem"

Delivery from china should be here end of may.

regards
Peer

Just a suggestion
You have to consider the problem that the capacitance becomes smaller after the capacitors are connected in series.

Of course, you made sure in SMC3 that motor 2 gets the same value than motor 1. They can be independant and have different values. Just to be sure.

I think you will have to exchange motor to see if it's not simply a motor fail.

Power Supply -> Del PSU. I did not check what you have, but for me, nothing compares. I sometimes forget to connect the battery to the system, and the PSU don't even care. They perfom without any flaw. But I agree that they are less cheap.

Good luck debuging.

Hi

i know, thats why a single cap has 2.7V and 100F and in the connected version 16V and ~20F

Thanks, i can need it

Yes, i´ve copied all settings of SMC3 so there is no different.
I see this stucking only if i use manually diving wit all 6 motors at the same time.
A single PSU brings 50A but i guess the inrush current of 2 motors at the same time is more than 50A
But only the inrush current, not the normal driving current, thats ~10A.
I got 3 of these PSU:

@all: what do you think about the SMC3 settings?
Does it look OK for you?
How can i optimize the settings?

kind regards
Peer

Those are my smc3 values. I cannot say that I understand them perfectly (read understand not a thing), but they work. I tried many value, and I cannot say that I got radical differences in the result.



I would say that manual moving seems choppy compare to game control. Like, there is a delay on what I want and what I get, but motors do not desynchronize. But it could be my perception of things.

To run my rig, I have three 24v / 12.5A del PSU.

Thank you very much for the settings you shared, I believe it will be of great help to me.

Hi Pierre
Thanks for sharing your settings.

I played last evening a lot with the PWM, but if i make PWMmax and PWMrev higher than 200 it´s getting even worse.
It´s stuttering extremely

So it looks really like to high starting or inrush current.
I have a older "lead-gel-battery" and will try this as buffer in next step.

Hopefully the SuperCap will be delivered faster...

regards
Peer

Hi

i tried to use FlyPT-Mover
But my rig would not move anyhow.

I copied the settings from FlyPT HexpodInterface and made 3 serial interfaces, one for each arduino.
It looks like this:

Here you can see only one com but all have the same settings (only com5 to com7)

Is this Setting correct?
Is there any discription how to setup FlyPT-Mover for a rotation pod with 3 arduino?

Thanks for your help
Peer

One short update
i tested the sim with an old motorcycle battery and there was no stucking anymore.
So hopefully the supercaps will do the same.
Lets hope that they don´t need 6 weeks from china....

Due to this brake i make some optimization of the rig
The metal arm where the wheel is assembled can now be removed so it is better for flight-simultaion
The pedals are mounted to an aluminium shield, looks and fells quit good.

And 2 minutes later without Racingwheel.

I think the strings are not correct,
The controller is unable to know from what is each received byte.
You should use the string used in Simtools (if you already used it with simtools)

The string should be:

[A<Axis1a>][B<Axis2a>][C<Axis3a>]
For the arduino that controls actuators 1 to 3

[A<Axis4a>][B<Axis5a>][C<Axis6a>]
For the arduino that controls actuators 4 to 6

if you have 2 arduinos, each for 3 actuators

if you have 3 arduinos, each for 2 actuators, then I think it should be (not sure):

[A<Axis1a>][B<Axis2a>]

[A<Axis3a>][B<Axis4a>]

[A<Axis5a>][B<Axis6a>]

FU**
Yes, now i see my mistake, I forgot the "[ ]" arround the <Axis1a> and also which one (A, B, C)

But you have to send all 3 commands and so there is <Axis6b> which is not configured.
[A<Axis1a>][B<Axis2a>][C<Axis6b>]
[A<Axis3a>][B<Axis4a>][C<Axis6b>]
[A<Axis5a>][B<Axis6a>][C<Axis6b>]

I will try it this afternoon
Thank you very much.
Peer

Hi all

i got a new idea by reading here.
Let´s make some wind

But how?
I found this threat: https://www.xsimulator.net/community/threads/mover-simulated-wind-arduino-sketch.14425/#post-195384

Is it possible to use one of the 3rd ports of my Arduinos?
Could the SMC3 Software be used ?
Does anybody can support me with some schematics?

kind regards
Peer