basic understanding

[hullcityafc]

hi guys first im new to this apart from reading . i have a few questions hopefully someone will answer. im hoping to build a 3dof platform

1st i plan on using the JRK12v12 x 3 what is the wiring process of these is it pc via usb + power supply >JRK12v12 >pot and motor
if so what steps can be taken to prevent any damage to the JRK12v12 or motor

what is the limitation of the JRK12v12 ie biggest motors it can drive . i plan on using 12v winch motors but am open to suggestions

is running a platform off 2 psus better than 2 batterys or 1 psu + 1 battery << i would like to use just psus but again open to best suggestion

is this all items i would need to do testing JRK12v12 + motor + pot + psu and software of course

thanks for reading and any help given

[yokoyoko]

Hi and welcome hullcityafc,

nice to hear about your plans.

1st i plan on using the JRK12v12 x 3

-> ok. Motiondave, Bobbuilt (and other here) are real experts on this boards!
Perhaps I can help you a bit.

what is the wiring process of these is it pc via usb + power supply >JRK12v12 >pot and motor

-> you may have a look here:
http://www.abload.de/img/110msno.jpg
The manual of the Jrk is available http://www.pololu.com/docs/0J38 -> there are info's on connecting too

what steps can be taken to prevent any damage to the JRK12v12 or motor

I learned by myself that you have to take care about your motors!!! I grilled one of my Jrk's because of a leak of ground.
The goal is this:
http://www.x-sim.de/forum/gallery/image.php?album_id=2&image_id=246 (thanks Bobbuilt)

1. Test the motors with out the Jrks plugged into it. basically if your power supply can run one or both motors in both directions, this can be do by wiring the motors directy to the power supply, then a quick on/off or diconnect your pots and test that the power supply can spin them in both directions.
While spinning test with a test light by placing clip on positive of powersupply and the probe on the casing, test in serveral spots if it lights up ya go a power leak not good will cause jrk to drop out evem blow up if there is enough amps.
The place the clip on the earth of the power supply and probe on the motor body in several spots and if it lights up you have a earth leak.
If it fails this and you cannot isolate them then i suggest finding some new motors.

If you mention this and if the stall current of your winches isn't higher than 40A --> I think no worry about jrk's or motor's. + Buy a proper haetsink and a fan for the Jrk's!

If you want to protect your PC Mainboard --> http://shop.trenz-electronic.de/catalog/product_info.php?products_id=812&language=de you can use something like this to connect your Jrk's to PC. But I think I am the only one using this and it is not required.

We got some other discussion in past about the Jrk's here -> don't panic about them... this boards are used sucessfully very long time now by alot of users. The most important part is get your motors "free of potetial and ground leaks in both turning directions".

Power supply:
Car battries should be fine - as they can do >360A 12V 36Ah f.e. - enough for the complete setup but you will have to charge it up again.
If you go for power supply be sure it will last your motors. The important is the current (stall (load)). Floris had some prob's with bigger motors and 30A power supplies and is going for 40A per motor now, I think.

My wipers use about 18A stallcurrent each but winches sound a bit bigger

I'm sure others will reply soon too. Hope I could help you a bit for beginning?

Best regards
yokoyoko

[motiondave]

With JRKS just wire it up right, there is not much chance of blowing the jrk, just get VIN correct mainly. Put heatsinks on the big chips and fan cooling, but keep heatsinks clear of any other components on the board. Use 12v12 for sure. Also triple check the wiring for the pot.
Make sure the motors are earth isolated, otherwise stray 12v going through the frame could go through the pot and blow the jrk.

Hook the power up FIRST, then the usb cables. JRKS are reverse polarity protected, but not when usb cables are connected first. I blew 2 jrks and one usb port on my pc motherboard from usb first and being too stoned and hooked up power the wrong way. PC still works.

The JRKS will run 30 amps continuous for hours and up to 49 amps for 6 seconds before they shut down. I run mine at 30 amps continuous no problems. So it depends on what motor you are running. Bobbuilt has use 12v boat winch motors rated at 25 amps with no probs. http://www.supercheapauto.com.au/online ... escription
I use these http://www.motiondynamics.com.au/worm-d ... orque.html rated at 16 amps standard and I have had them at 34-38 amps stall current. All good.

Power supplies are your choice. Either 2 BIG 12v 40 amp power supplies or one 20-30 amp and a car battery in parallel.


Yokoyoko already posted the wiring diagram for jrk to pot to motor to power supply. Thanks for that.

As for testing, that should be all. Just use a single turn 5k pot to start with for feedback. Make a lever off the motor shaft for the feedback pot to "read" off.

Just fire away with questions as you need to.
Cheers, Dave.

[hullcityafc]

wow great post thankyou , the test for the leaks ive put in my notes , i also will consider the usb isolator.
i did find that diagram before from pololus website in the documentation but the image was blury for some reason so thanks for that.

so 40 amp psu's one for each motor should be good if the motor has a stall current, of no more than 40 amps
not sure how i can get the stall current is there anyway of calculating this or will i need to find out from manufacturer
i was thinking of buying these

http://www.ebay.co.uk/itm/New-Rolson-El ... 20c58e6bfb

but also not sure if maybe another motor with worm gear may be a better option
**edit** aactually scrap that i think ill go woth the motors you are using , with 3 motors positioned in the best possible place what would be the lifting capabilities of these

what about the power for the jrks would it be better from a a seperate psu to the motors

again mate thanks for your reply its been a big help

[motiondave]

Winch motors are good for 3dof as they have great lifting, but need a calculated spring under the frame to assist this.
Bobbuilt can advise on winches, I will leave this to him.

For finding stall current, usually it is double the rated, but as said, the winches would not run much higher than rated as they lift well.
Worm gears tend to run at stall more, but more research is being done with these motors. Bobuilt is on this one as well.
I havent tested big worm gear motors for lift, but I am sure they would work.

Yes 40 amps psu per motor gives you room to move. One power supply per jrk which goes to one motor.

[hullcityafc]

Winch motors are good for 3dof as they have great lifting, but need a calculated spring under the frame to assist this.
Bobbuilt can advise on winches, I will leave this to him.

For finding stall current, usually it is double the rated, but as said, the winches would not run much higher than rated as they lift well.
Worm gears tend to run at stall more, but more research is being done with these motors. Bobuilt is on this one as well.
I havent tested big worm gear motors for lift, but I am sure they would work.

Yes 40 amps psu per motor gives you room to move. One power supply per jrk which goes to one motor.

thanks motiondave i never realised there was 2 replys already when i edited my last post but i think i prefer the motor you are using just curious of the lifting power of 3 of these if placed in the best place

ah right so 1 psu per motor + jrk

**edit** forgot to ask do i need a fuse beween the jrk and the motor also is it the 12v motor you are using or the 24v and is there any stockist in the uk or any similar motors available

[yokoyoko]

thanks motiondave i never realised there was 2 replys already

hehe simracers are fast people...

is there any stockist in the uk or any similar motors available

Floris uses this motors from the UK for his beautiful sim. You will need the motor and a gearbox. Gearboxes are available from 25:1 to 600:1 or so... 25:1 or 50:1 should be fine. If you want the "motor-gearbox" combination more powerful [N] you can use the 50:1 gearbox but have a slower movement. Give some geometric data of your planed sim and your weight and we can look what will fit best.

For example the gearbox:
http://www.ebay.co.uk/itm/25-1-MCP-4-Gearbox-/110751091855?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item19c9478c8f
The motor:
http://www.ebay.co.uk/itm/DC-Motor-ZYT90-155-12-Fits-MCP4-Gearbox-/380393781762?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item58913c7a02

I will use one of them for third degree of freedom too soon.

[hullcityafc]

thanks yokoyoko my plan is to build the same as aldoz on the other sim.de forum ie similar footprint and the same movement . my weight is around 93 kg although if possible i would like to allow for more weight , i also may want to lower the platform as i planed on making the seat interchangeable ie locking slide rails so i can swap out the car seat for maybe a motorbike like the arcade ones

im also wondering how much i could hide the the electrick parts ie motors power supply rods ect (safety reasons) for the motor bike part

[yokoyoko]

Can you post a picture or drawing please? I don't know this users sim on old forum.

[hullcityafc]

Can you post a picture or drawing please? I don't know this users sim on old forum.

yea sorry mate , here you gohope a vids ok http://www.youtube.com/watch?v=jmNmz3WR ... ure=relmfu