The 200 Hz means you have to run them at 200 Hz to get 3000 RPM. 3000 RPM = 50 revs/s so I guess that means they are four pole motors?
Also since they've got encoder mounts I guess they don't come with encoders. And they look very wide, perhaps this is some kind of high inertia motor that is not as good as normal servo motors in terms of acceleration? Just guessing...
Arvid |