I believe you are seeing mid band resonance (if you try to tune the motors to higher velocity they don't work well). You need inertial dampers on the motors. Using a Xylotex driver you should be able to double the motor speeds with dampers. A better way to fix the problem is by using Gecko drivers (they are bring out a 4 axis low cost system very soon). Geckos have electronic mid band resonance correction built in. |