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Hello, If you're impatient just skip down to the questions bit. I've been lurking this community for a long time, but now I have a good reason to post. My old Fanatec GT3 RS V2 is dying and I've decided to go all out for an OSW (Open Sim Wheel) setup. I've spent weeks researching like crazy and reading literally hundreds of forum pages here and at many other forums. I've even been using Google Translate to read French, German, and Italian forums which seem to have a lot of good information as well, even though it is tedious. I'm a big computer geek, but I'm not an electrical engineer so I'm learning as I go when it comes to power supplies and motor specs. I'll present a summary of the things I've learned to help others as I learn myself. Here are some examples of forum resources I've found on OSW primarily contributed by the famous "Beano": http://www.isrtv.com/forums/topic/19813-leo-bodnar-simsteering-v2/ http://isiforums.net/f/showthread.php/24986-Project-BruteForce2-IONI-based-DIY-DD-FFB-Wheel https://forum.virtualracing.org/showthread.php/95803-Project-BruteForce2-IONI-based-DIY-DD-FFB-Wheel-(Extensive-worklog) http://forums.overclockers.com.au/showthread.php?t=1139613 http://www.racingfr.com/forum/index.php?showtopic=51856 That last link is of particular interest as it's a fairly recent summary from Beano on the current state of things and it makes it sound like I can use an AKM motor with Simucube. After all the research it looks like I've gone through the entire history of OSW and much of the information is no longer up to date. Today I'm looking at a Simucube based build hopefully using a Kollmorgen AKM motor. I want the highest quality OSW wheel I can reasonably build and ideally I want 1:1 torque. I've checked out a number of vendors who sell OSW kits and found lots of Mige stuff but no Kollmorgen kits aside from what Dennis Reimer sold using an Argon controller (he closed up shop so that isn't even an option now). I'm located in Canada and the cost of parts with shipping and currency exchange is high so I'm trying to be as smart as possible about how I source everything. I'm going to see what my options are for motors locally before buying everything else foreign. When it comes to picking a motor I know the Mige is a great option, however if I'm doing so much work to get this researched and built I might as well upgrade a notch and not have to upgrade again. The Lenze might be a good choice and I might actually go with that, but can I do better? So I watched Barry at "Sim Racing Garage" and his reviews of the high end Bodnar systems and here's what I learned: Sim Racing Garage: https://www.youtube.com/channel/UCT_50ZiRFWSm7oziV1OZloQ Bodnar SimSteering Specs: Bodnar SimSteering V1 Motor = Kollmorgen AKM52G-ANCNEJ00 - Encoder based (EJ encoder) Bodnar SimSteering V2 Motor = Kollmorgen AKM52G-ANCNC-00 - New resolver (C resolver – AKA "Smart feedback device") Both V1 and V2 use the XP DNR480 Power Supply for AKM52 based motor. Barry also tested an OSW kit with a Kollmorgan AKM53G-ANCNR-00 motor which was popular (also resolver based ("R-" in the part number), powered via Argon). Apparently this new Bodnar V2 system is a step ahead of the V1 system using the new "smart" Resolver based feedback according to Barry. How to read a Kollmorgen part number: AKM53G-ANCNC-00 translates to: AKM series Frame size 5 Rotor stack length 3 Winding Type G International Standard Mount (A) Smooth Shaft (N) IP65 connectors (C) No brake (N) Smart feedback device Resolver (SFD) (C-) Standard motor without shaft seal (00) The "C-" in the part number is the resolver. Or, if the motor has the "EJ" code instead that means "10000 PPR digital encoder". Where to find Kollmorgen motor details: http://www.kollmorgen.com/en-us/products/motors/servo/akm-series/akm-series-ac-synchronous-motors/ac-synchronous-servo-motors/ I pulled the catalog and motor selection guide from here and dug in. The numbers are daunting, and this is where I'm starting to get lost. Power Supplies: The "Mean Well SDR-480-48" seems to be a popular choice that is packaged with kits, however I want a power supply that has no risk of straining. Beano presents some other options here: https://forum.virtualracing.org/showthread.php/95803-Project-BruteForce2-IONI-based-DIY-DD-FFB-Wheel-(Extensive-worklog)?p=2137757&viewfull=1#post2137757 With that, I wonder about using something like this: http://www.antekinc.com/ps-8n48-800w-48v-power-supply However, it does appear that Bodnar is powering AKM motors with only 480 watts. SimuCube / IONI: https://granitedevices.com/wiki/About_SimuCUBE https://granitedevices.com/wiki/SimuCUBE_hardware_requirements Kollmorgen motors are not listed in the Simucube motor table here. Questions: I'm pretty sure I want more than an AKM52 for torque. Is an AKM53 enough, or do I dare consider an AKM54? As the motor gets bigger you get more torque, sure, but you also lose out on other aspects such as speed and responsiveness, I think. I don't know much about the motor winding type differences. It seems like most motors are using the "G" type winding (Like AKM53G), are there any other options I should consider? I hear the "G" winding is optimized for more torque. Beano has a setup that uses the "K" winding. What kind of power do these Kollmorgen motors take? From the spec documents I gathered they are "Brushless servo motors, AC". Can the Simucube / IONI power them? I think so...but I'm not positive. On page 61 of the Kollmorgen catalog they list the AKM specification numbers in a big table, with different columns under different voltage values. How does that voltage stuff work here? Suppose I have an 800 Watt PSU supplying 48 V to the Simucube with IONI Pro HC, and the IONI supplies a max amperage of 25 A to the motor...um...something something voltage? I know Watt = Amp X Volt, but I'm getting lost here. How do I read that fancy table? Simucube does not support resolvers, it only supports encoders so I would be forced to use an Argon for a Resolver motor. Should I stick with the encoder, or consider abandoning Simucube for Argon? Simucube seems like the better choice, I just wonder if I'd be missing out on something with the encoder. I understand it may be possible to get an encoder with even higher resolution than 10000 PPR? "You will get better positioning and thus feel finer FFB forces.....after 32k PPR though, no advantages......between 16k and 32k the best for is racing use I believe.... " - Beano Are there any other good forums or resources I haven't yet found that could help me out? I suppose that's enough for a first post. I haven't even begun to figure out wheel details yet, just getting this motor and Simucube stuff sorted out is my first step. Thanks. JonnyK
I'm selling one Bodnar Simsteering 2 steering system in perfect conditions, very little used. I'm going to buy the 54 model. I'm Italian and I can ship it wordlwide with express courier. Some photos: Price: 2600€ (tractable) I include: _simsteering2 mod52 system (motor + control box) _Bodnar shaft clamp adaptor (50,8mm - 70mm mounting holes) _Bodnar mounting bracket Ready to use.. only need a wheel rim. Filippo.