| abstract |
Disclosed are damper devices, magnetic viscous devices including rotary devices, and haptic systems comprised of these devices. These devices include dry magnetically responsive particles, or MR fluid containing the magnetically responsive particles. Soft magnetic particles have a cumulative volume fraction of 10%, 50%, and 90% by volume (ie, 2 μm D 10 to 5 μm D 10 or less, 8 μm D 50 to 15 μm D). 50 or less, having from 25μm of D 90 40 [mu] m of D 90 or less), characterized by a single process output product population of atomized particles, and, of 0.77 or more, the smallest log-normal particle size against cumulative volume% fraction Characterized by square regression. |