On 1/19/2016 11:55 AM, John Dammeyer wrote: >> into the rotor. Microstepping also increases resolution by >> a small amount. But, I am convinced Mariss Freimanis is >> correct that microstepping more than about 10:1 really >> provides no benefit. A stepper motor can be modeled as a >> mass (the rotor and external load) controlled by a spring >> (the magnetic force on the rotor). Changing the motor coil >> currents moves the point where the spring is pulling from. >> Thus, a stepper does NOT have some hard mechanical detents >> in it. Apply a torque, and the position of the rotor >> shifts. If you have encoder feedback, the PID system can >> send a slight shift in position to compensate for this. >> But, you really don't get a lot of control over it. >> >> Jon >> > Hi Jon, > Everything you say is correct. In a pure open loop system I also agree with > Mariss that micro-stepping is really more about dealing with resonance > issues rather than positioning. Where things have changed is the with the > capabilities of the high speed DSP processors to monitor phase current and > encoder position.
Closed loop stepper controls like this https://www.youtube.com/watch?v=2SozZ7af3wg and this https://www.youtube.com/watch?v=M_IuG20PIPQ --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
