stepper motor

[mgoat]

I currently am modifying the position control loop example that came with Labview and i have the motors turning but it is very jerky and acts like the pulse timing is off.  I am using a 9501 module with a standard nema 17 4 wire 24 volt stepper motor.  I was wondering if anyone knew some paremeters that would work with the motor.  I was looking for the following paremeters:  Position loop period, spline update period,  pos period/spline period, minimum pulse width, spline period/pos period, spline period/step period.  

Thanks for any responses.  

[Joseph-S]

Hi mgoat,

What version of LabVIEW are you using? There is a known issue with the VIs in 2010 for the 9501 which have some timing issues. Take a look at this document for the recommended example VIs: http://digital.ni.com/public.nsf/allkb/095FC58BB279E4178625778A0056E048. Let me know if this is applicable to you. If not, we can continue troubleshooting. 

[mgoat]

Thank you for you response, i am using lavbiew 2011 and the link that was posted gives me an error on the page which will not open.  I think i have the parameters about right but and still struggling on what level of microstepping is good for a high speed application.  Also for some reason on the initial move the motor jumps back in the oposite direction then moves toward the correct direction.  I am using a modified version of the Position Control (Open Loop) example.  If you can give me any insight it would be much apprecieated.  

Thanks

[AnalogKid2DigitalMan]

Extra period at the end of the link.

Try this:

http://digital.ni.com/public.nsf/allkb/095FC58BB279E4178625778A0056E048

-AK2DM

[mgoat]

Thanks for you response, we actually used this link to base our FPGA off of.

Thanks