High Speed Linear Slide, 1 DOF troubleshooting

I'm building a high speed linear slide for video applications. I hope to eventually add a pan/tilt motorized head, and eventually focus/zoom as well, but that's a ways off. For now, trying to get reliable position control and high power capacity.
The first part is in FOC (Field oriented control), using current control (the faster part), and velocity control (the slower part). A little later, something started getting buggy before I was able to shoot the high speed position control portion, and I couldn't get any sort of stable position control loop.

[@bradley5819]

Wow! Serious reaction

[@AdrianElMeca]

Hello there, i'd like to know how things went on this project! please reply

[@jgeating]

The VESC isn't great for >1 rotation position control at high speeds. If the error term is ever greater than 180°, it reverses direction (this happened frequently when pushing speed limits). This can be fixed by altering the source code, but I never successfully did that. I would recommend going with oDrive for linear motion or geared rotary applications. The slider worked just fine for slower movements (walking speed or slower).

[@AdrianElMeca]

@@jgeating Thanks for the feedback! I've been thinking about using oDrive too, thanks for the tip

[@aaronacj]

Use a servo or stepper.

[@gizmoguyar]

A servo would be great. But they are very pricey. Open loop steppers can't usually run that fast at any useful load. A three or five phase BLDC is definitely the way to go for size, efficiency, and performance.