I've read about PM stepping motors but not clear whether they are fast enough.
I need to rotate a disk (around 20cm diameter of a lightweight material like aluminium) as fast as possible. It would need to stop momentarily between rotations. I'd like to reach speeds of 90 degrees turns every 1/4 second, and later perhaps even faster if possible (1/9th or 1/18 second?).I've read about PM stepping motors but not clear whether they are fast enough.Can anyone recommend a type of motor or a specific motor, please?thank-you.
Perhaps I misunderstood that there were PM stepper motors could rotate in exactly 90 degree increments? I was reading the following pagePM stepper motors generally have step angles of 45 or 90 degrees and step at relatively low rates. However, they exhibit high torque and good damping characteristics.http://www.anaheimautomation.com/manuals/forms/stepper-motor-guide.php
But I understand what you are saying about getting absolute positioning and building/buying a feedback loop system - and I guess that is a possibility.
Would another option be a servo? This one does 360 degree. Would it have enough torque?
With a solenoid I could make a back and forward motion, and maybe I could scale up the motion, flipping a 60mm square back and forth instead of rotational. But building complex mechanical elements are not within my grasp, so any off the shelf elements that can be built into a solutions are more pragmatic.
At the moment I am prepared to build something a bit slower than my ideals - as I am really testing feasibility of my idea. Making a working tool use it and then maybe improve it if it proves it's potential. At this stage I think I need to make it as simple as possible to match my current capabilities and resources.