I understand the reason why some DD wheel suppliers choose to show torque-charts are shown, they serve a dual-purpose, from my humble point of view.
Be assured though, those tests are not required for DD wheels based on Simucube1/IONI or Simucube2 controllers and related servos design, more so for SC2 with it’s silent, smooth and efficient passive-cooled design concept.
As I have stated quite a while back when these first appeared, Stall-torque is meaningless really in a sim-environment, peak-torque is really what matters, as we never enter extended stall-conditions in racing-sims, where one might exceed the mechanical time-constant of the servos, forcing torque-deration. At least not with in-runner servos with their much higher thermal-mass.
Out-runner servos is a different proposition, the higher torque capacity/weight/size comes with the disadvantage of a significantly reduced area for the stator, which causes big challenges for ripple-control algorithms, as well as the challenge getting the heat out of a servo, very often requiring active cooling. Fan-noise will be dependant on the quality and size of the fan.
So whilst out-runner style-servos are great for lightweight torquey equipment, higher-end precision position-based CNC Automation equipment are all using in-runner style servos due to their superior smoothness wrt significantly reduced ripple-torque due to a large stator-area (by design) and thermal management properties, reduced ripple allows for much greater positional accuracy, vs the out-runner style servos.
Guys, there are very good reasons an industrial drive-controller supplier like Granite Devices went with in-runner servos over other types: quality, reliability, absolute the best in positional accuracy, smoothness and other factors, are only a few key differentiators.
SC2 is in-runner and passive cooled, by far the best current DD wheel on the market, from my initial testing. More later after longer seat-time.
Cheers,
Beano