Smooth sinusoidal movement without gear, buffer/modelling on board?

Hello

My ultimate goal is to have a stepper motor (200 steps/rotation) to produce a movement sinusoidal smooth at 1 Hz with an amplitude of 200 to 500. Everything I've read so far has lead me to believe that this is impossible, given the motion control 7330.

My best results have been produced when an array of points have been created and used to change the Position of the target inside a While loop. The frequency has been changed by changing the number of points in the table representing a cycle complete (an array of 32 data points of results at a higher frequency than a table of 64 data points). However, it was not acceptable because the motion to 1 Hz was not smooth. I tried to play with acceleration, deceleration, speed and time of the S-curve, but nothing helped.

I thought to 'Load Circular Arc' VI using the and just assigning the axis of the 2nd motor out as artificial, but this isn't a good solution, I will eventually use all 4 axes of motorization.

My question: is it indeed impossible to produce a smooth sinusoidal movement of 1 Hz with a controller of axes 7330? I realize account 'smooth' is objective, but circular motion produced by the VI 'Load arch' is 'smooth' is enough.

Hardware/software:

PCI controller, 7330

MID-7604 motor control

LabView 2009

Any information on this matter is greatly appreciated. Thank you

Nick

Nick,

as it seems that you have already found all the possible solutions for your task. In fact, bow moves with a fictitious axis would be the only reliable solution for your configuration. If you can't afford to waste one axis, the only alternative is to move to a 7344, which takes care of contouring.

Please note that the 7330 is our low cost solution for the tasks of control of movement with engines step by step. Advanced trajectories are not as part of this product, so if it is a requirement, please contact your local branch of NOR. If you have recently purchased the 7330 or not, they might be able to offer a hardware upgrade to the 7340.

Kind regards

Jochen Klier

National Instruments

Tags: NI Hardware

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