Hi guys,
I need help for an appilcation we have here at work. We have a stepmotor (HT23-398D-ZAA) that include a 2000cpr encoder with STR4 drive and a PCI-7334 controller board. We had a UMI-7774 but we broke it and we dont have time/money to invest on this at this moment. Instead we used a SCB-68 and wired it using the controller pinout. After much trial and error trying to make it work it is now fully working (in MAX).
Our application use to motor to rotate a propeller. We want to rotate the propeler at the designated position brake for a some distance and then reaccelerate. Nominaly we wanted to do it each turn. So it would be like that :
In this application, we need as much torque as we can get. As far as I know, to get the maximum torque possible we need to use the stepmotor in the full step configuration (200/step per rev)? As we need to brake at a certain position, I need to control it in position and not in velocity.I see that I dont really reach my target velocity before it is accelerating again. Is it the reality or it's because I dont have enough resolution on my encoder to make a real measurement on such a short time?
I made a test to show you guys. When I do a test from 1000rpm to 300rpm, the graph show a clean curve but 1000rpm to 900rpm it is not... I would think that it would be easier to only brake from 1000 to 900... Is there something I don't see? I'll also put scope measurment. There is weird behavior in the 1000 to 900 one.
1000RPM to 300RPM :
1000RPM to 900RPM :
