To me it seems as thermal throttling to stay within safe operating temperature, but without known fan characteristics (fan speed) and overall sound characteristics if those aspects are interesting things to the user. The product seems to have fan control algorithm that has “steps” as the stall torque also decreases in “steps”. In anycase, this picture is needed/useful for the mfg engineering work, not so much to the end-user provided that the product’s torque output does not (in normal conditions) behave as a function of the temperature of the parts inside the product -> thermal throttling in normal conditions. According to Brion the wheelbase should have linear torque output with the exception of the end to end travel bumb stops where torque is little bit lowered after some time which is unlikely to concern the users as a feature.
In our opinion the aspects that matter for the drivers (and what aspects we have used in our product design ) are smoothness, low cogging, low ripple, high torque response rate, and high motor efficiency which enables passive cooling (and lower power consumption) and low noise.
And about the heat generation in Fanatec DD testing video, I still remember it shown as around 60℃ under stress test, with two motor stick together and twist in opposite direction I believe.
I have recently done some thermal time constant experiments and math on SC2 motors.
Assuming passive cooling in room temperature, SC2 Sport motor can keep full 100% torq for 4,5 minutes and Pro/Ultimate for 6 minutes before torque begins to throttle at all.
Best thing here is that the torque will stay constant before it’s beginning to reduce. This is significant characteristic as it ensures linear and consistent force feedback. In practical racing, there is no such long periods of peak torque, so it is unlikely that torque would start throttling at all.
How is the inertia? Are they (sport/pro/ultimate) easy to spin when dead like some of the super premium direct drive servos? Not really sure if that matters but I do remember reading some of those premium servos were easier to turn and smoother when dead vs the miges
The Fanatec does run daily cool but I have run it up to 89c in my running on the Beta Model I have… that being said it does have an internal fan to keep things cool… it stays pretty quiet but not always.
Hi Joe,
I always considered 200-300rpm to be the ideal-range envelope, but the only way I could control mine back then was by either psu/voltage selection or servo choice…subsequent testing has confirmed (for iRacing at least) that it covers the preferred range
The new SC2 Ultimate will have an actual slew-rate filter to support speeding up or slowing down the servo to your preference, giving another layer of control over the ffb feedback behaviour. Tero can tell more about that one, but I am damn excited to get my hands on the new beta FW with added filtering, what I saw on that list was exciting
That sounds AWESOME!
Getting the overall speed lower is something I always wished we could do.
I will end up with an ultimate. I will let you crash test dummies work out the bugs first!
No film of the Giant falling on the ice this trip to see the boys in Finland? LOL
Can’t remember out of my head, I think it would be good idea to add this info into product specs among other things asked here. They’re on our backlog
Beano is right, there will be new filters to fine-tune speeds to user preferences. Filters will be somewhat experimental at start, and their characteristics will be fine-tuned based on user’s feedback.
I have done experiments with a filter that reduces torque as function of speed. Testing continues, it probably won’t make it in the first software version.
Very powerful and strong motors…