RPM needed for a sim wheel?

I have heard many discussions on many sim racing forums about how much torque you need for a sim wheel, but i haven't seen any discussions about how much speed you need. I am asking because I am looking to build a sim wheel, and i don't know what reduction ratio to pick. So how much speed do you need? Is 600 RPM enough?

If using torque only, RPM doesn't really matter, but if the motor driver has max RPM limit, it should be set to about 150RPM.

Here is what happens if the max RPM is left at 3000RPM:

I had that happen with my large mige, thank god I mounted the e-stop very close to the wheel. Slow is better than fast

May I ask, what model is the motor that you used in the video?

90ST 750W AC servo motor with AASD-15A driver.


More information can be found here:

https://www.thanos-motion.com/products/thanos-tdd-controller/

@Thanos will you bring back the TDD once the supply chain issues are sorted?

Last time I checked the lead time for these DAC chips were to the 2nd quarter of 2023...

Same with several other chips. I see only 1/8 of all kind of chips stocked right now... terrible time for developers and manufacturers

OK, I know I am asking a lot of questions, but bare with me.

I don't know if this is the right motor, but i found this one on Aliexpress, it maches your description.
(On the Thanos website it only mentions the large MiGE.)

But the listing says 2.4 N.M, that's not much more torque than a G29, the only benefit you get is the direct drive, but when you factor in the controller, wheel and the pedals, it comes out much more expensive than a G29, so, why bother, except for the DIY aspect.

And last question, how are the paddle shifters connected to the controller in the video? I am facing a similar dilemma in my build.

That website mentions a range of motor sizes from 130ST to 90ST and the controller which is 15amp. ST designates physical size for mounting but it also indicates power range (sort of; larger stronger usually). It is not really a perfect range indicator for power. My monster OSW DD wheel uses a 130ST motor @2.6KW 220v AC rated for 25 N.m of peak torque. It will indeed rip your arms off....massive overkill to be honest.

2.4Nm of the Logitech wheel is peak torque, how much it can reach for only a moment. The AC servo motors like the 90ST 750W has a peak torque of 9Nm and an operating torque of 2.4Nm. HUGE difference. My finger can hold back the wheel of a Logitech unit while the servo motor unit would rip my finger out of the socket.

Put it this way, I use four of these motors to lift my very very heavy butt and massively overloaded metal simpit up and down and it can shake me like a dog shaking a chew toy. There is a real reason behind that safety harness that I buckle up other than the joy my wife gets in laughing at me.

The Thanos board is not available but if you did have one your could hook up custom buttons (paddles) using the DB9 connectors.

I have a Fanatec BMW wheel that I use for my DD wheel base and use a Teensy LC controller board with custom firmware to connect the buttons/paddels/rotories etc to the PC. You can get and use a huge range of controllers for custom buttons: Leo Bodnar, Derek Spears, etc.

Before buying anything do a TON of research on your project first.

haha, I fell down a rabbit hole this morning vis-à-vis your question about motors. Barry Roland's Sim Racing Garage has a review of the G-29 if you want to see the motors that drive the G-29 (dual motors). The torque of the wheel comes from geared system which is why the wheel is very very slow (comparatively). The motors themselves are not 2.4Nm, the torque is after the gearing. The motors are somewhere in the 0.20Nm to 0.45Nm operating torque rated.

Thanks for the very detailed reply. Really cleared up the torque dilemma. I am currently in the research phase of my build, don't worry. I understand mechanics and electronics decently, so I am probably going to use an Arduino for the control board. I might have expressed myself a bit unclearly, I know they are connected to some central control board, but my question was how were they hooked up electrically since I don't see any slip rings or cables, and I doubt that there is a wireless connection.

You can do a wireless (bluetooth) connection if you choose. Both Bodnar and Spears have those controllers available.

Or BlueHID (what I use on my buttons on my wheel):

Here's some additional video for inspiration

Thank you for the reply, it will be a huge help in my build.

interesting, so 150 rpm is more than enough.

https://www.xsimulator.net/community/threads/dual-775-ffb-wheel.17009/