cterrill

The attached file "sample sinusoid.txt" is the initial file I tried. It created the profile from the screenshot in the linked NI forums post. The other attached txt file, "sample sinusoid 2.txt" is a different sinusoid with the amplitude increased to 10000 steps and the period shortened. I also rounded off all the values to the nearest whole number, in case decimal values were affecting the profile calculations. That yielded the attached screenshot.

Perhaps I should try increasing the time between points? It might smooth out the profile, but it doesn't particularly help with the actual application I'm working on, which requires a very specific velocity profile and very precise movement, which I'm worried will suffer as the time step increases.

sample sinusoid 2.txt

sample sinusoid.txt

Hello. I'm crossposting this question from the NI forums (here: http://forums.ni.com/t5/Motion-Control-and-Motor-Drives/Creating-a-sinusoidal-velocity-profile-with-PCI-7354/td-p/3142856 ). I'm working with a PCI-7354 board and attempting to create a custom sinusoidal velocity profile for two different motors to run simultaneously. I've been trying to run a simple 1D sinusoid using a contoured move in Motion Assistant with a PVT (position-velocity-time) profile. Due to the way the PVT profile calculates trajectory, I've ended up with a giant zigzag velocity profile that makes the motor jerk and jitter quite a bit. A screenshot of this can be found in the linked thread. I tried using a 1D position profile of a sine wave, but the velocity profile in Motion Assistant became a square wave.

I may be missing something simple here, but is there a way to simply create my own velocity profile and input it? If not through Motion Assistant, surely there's a way to do it using the Motion VIs in LabVIEW. Additionally, the 2D PVT move in Motion Assistant only accepts a total velocity magnitude. Is there a way to perhaps run two 1D profiles in parallel, maybe with one triggering the other at a certain point? I'd like to be able to modify one of them without having to mess with the other in the future.

Thanks!