Floriske.nl's 2DOF Playseat GT Wiper motor Project

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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby tronicgr » Tue 2. Oct 2012, 15:48

floriske wrote:Now I'm using these: http://www.ebay.nl/itm/12V-45A-600W-Swi ... 5ae92a13a5

And so far I have had no problems with them. The fans are VERY loud though, so I am going to remove them and add 120mm fans for cooling.


Hi Floriske,

I'll advice you not to remove those fans... Most likely the PSU will sense the drop of RPM or some other safety function they have there, and probably won't power up properly. You see, Computer Server Parts are made with so many safety checks that sometimes they deny to work even if its just a simple fan!! Beware! :roll:

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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby floriske » Tue 2. Oct 2012, 20:52

tronicgr wrote:
floriske wrote:Now I'm using these: http://www.ebay.nl/itm/12V-45A-600W-Swi ... 5ae92a13a5

And so far I have had no problems with them. The fans are VERY loud though, so I am going to remove them and add 120mm fans for cooling.


Hi Floriske,

I'll advice you not to remove those fans... Most likely the PSU will sense the drop of RPM or some other safety function they have there, and probably won't power up properly. You see, Computer Server Parts are made with so many safety checks that sometimes they deny to work even if its just a simple fan!! Beware! :roll:

Thanos

Exactly the reason why I'm going to replace them with fans with rpm sensor as well ;) only thing I need to test/find out is if the rpm difference won't be a problem ...... only one way to find out :twisted:
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby floriske » Tue 2. Oct 2012, 22:21

Image

Today I finally got to testing my new motors :D

Been busy with some home improvement, but most of that's finished so it was time for some fun work.

They move like h#ll that's for sure! But I do need to retweak my profile though.

For those interested in the settings:

PID: 6/5 - 13/8 - 3/2
PID period: 10ms
Integral limit: 1000
Feedback deadzone: 2

Max duty cycle: 450
Max acc.: 450
Brake duration: 0
Max current: 30A
Max duty cycle while feedback is out of range: 450

Anyway here's a short 2 min video of the motors in action, as mentioned the profile needs tweaking and I will make a new video in better light conditions soon:

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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby dearn » Tue 2. Oct 2012, 22:26

Very nice to see Floris! The motors are looking good! :D
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby floriske » Tue 2. Oct 2012, 22:42

Thanks! Really need some profile tweaking though, the little bumps are more like big waves using my old profile :D
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby motiondave » Wed 3. Oct 2012, 00:07

Yes nice job there, I am surprised to see the "i" of PID so high, 13/8! Bugger me! Mines still 0/3.
Just a suggestion , if you reduce "p" down a bit , it may sharpen up the motion, mind you, I spent about 8 months playing with PID on my motors.
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby floriske » Wed 3. Oct 2012, 09:06

motiondave wrote:Yes nice job there, I am surprised to see the "i" of PID so high, 13/8! Bugger me! Mines still 0/3.
Just a suggestion , if you reduce "p" down a bit , it may sharpen up the motion, mind you, I spent about 8 months playing with PID on my motors.


The "I" isn't as high as you think ;) it's the decimal number behind that counts which is something aroung 0.05..... (not at home atm and don't know it by hard ;) will add the decimal values later on)

Here's the PID strategy I used after some online research and tips from BobBuilt:

• Start playing with the test plugin to find the value for "P" at which it becomes unstable/overshoots
(Using 1 slider per motor, fastly moving the sliders manually and also setting it to auto at max speed so the sim starts rocking)

• Reduce the max "P" value with 40-50%

• Increase the value for "I" until the "error" is +/-1 and enable reset integral when proportional term exceeds max duty cycle

• Increase the value for "D" to prevent overshooting

• Start testing in game and reduce Max duty cycle etc. to a comfortable feel

Still need a lot of fiddling around, but at least it's up and running again :D
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby Riton » Wed 3. Oct 2012, 19:44

It seems to me that the engines are 180 Rpm or close, is not it?
I think it is slow , if I takes the high speed output....
If I compare my speed to 16 Rpm on my simulator, I do not understand a difference as large.

I would like to know the choice of engine too fast, is that it is useful?
Last edited by Riton on Thu 4. Oct 2012, 08:16, edited 1 time in total.
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby motiondave » Thu 4. Oct 2012, 00:53

Ok this is an interesting one.
My motors are 180 rpm at the shaft as well, but I do not think its a "too fast" thing.
It took me ages to sort the PID on my motors which are these http://www.motiondynamics.com.au/worm-d ... orque.html
The speed was an issue until I found a decent balance between PID and motion settings. But that was to stop errors more than anything.
Now I have nice smooth motion for lateral, longitudinal, and pitch, and nasty fast vertical ( bumps).

This seat mover I built a while ago had boat winch motors, but only one gear, so they spun at 300rpm or more on that one gear, but I never had an issue. Mind you, by this time, I had a good idea on PID ( Thanks Bob.)
http://www.youtube.com/watch?v=80cK4dMt_TA

On the foot motor mount sim , this vid is nuburgring long track, so its got fine bumps and some rolly hills, hence giving me "nice smooth motion for lateral, longitudinal, and pitch, and nasty fast vertical ( bumps)."
http://www.youtube.com/watch?v=r2Y5kQyJ ... re=g-all-u

PID was tricky, and I found needed individual adjustment on each set of motors. Floriske is going to have to experiment with PID , power more and motion settings more.
He is getting there from what the video shows. :)
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Re: Floriske.nl's 2DOF Playseat GT Wiper motor Project

Postby Riton » Thu 4. Oct 2012, 08:25

The PID can be reduced speed?
The innertie or mass simulator can also be reduced speed?

It should just connect the motors directly without electronics to see the maximum speed in action

I'm really surprised to see the output speed as slow for a 180 Rpm.

normally it should be very fast and very reactive with 180 Rpm

I expected to see the other videos to understand the difference between 180 Rpm and my small 16 Rpm

Moreover, on the video, I do not find much difference with the wipper motors are 6/8 Rpm
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