Wow! That is really cool, Ralph! I would love to hear more details about your project. I have a bunch of questions like: what sort of resolution can you achieve, how much force does it produce, etc.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ We are like tenant farmers chopping down the fence around our house for fuel when we should be using Nature's inexhaustible sources of energy -- sun, wind and tide. ... I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that. -Thomas Edison, inventor (1847-1931) >________________________________ > From: Ralph Stirling <ralph.stirl...@wallawalla.edu> >To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net> >Sent: Thursday, July 5, 2012 11:21 AM >Subject: [Emc-users] linear motor tuning questions > >I have my prototype linear motor running now, but I'm >observing a rather severe resonance under higher >accelerations. This oscillation is about 10Hz, and >generates following errors if I don't have wide limits >on f-error. I've attached a halscope plot illustrating >the problem. You can see a video of my motor >running a simple test program at: >http://youtu.be/Ayqn0OidF0Q > >Right now I have my pid parameters set pretty >basic: > >P = 5.0 >I = 0.0 >D = 0.0 >FF0 = 0 >FF1 = 0 >FF2 = 0 >BIAS = 0 >DEADBAND = 0.02 >MAX_OUTPUT = 10 >ENCODER_SCALE = 512 > >I have a suspicion my problem may be related to >delays through the AS5311 magnetic encoder I'm >using for feedback. I just looked on the datasheet >again, and see a 384us delay for incremental >outputs. That is nearly one servo period delay. >I like the price of the AS5311's, but optical might >work better. Opinions & suggestions? > >Thanks, >-- Ralph >------------------------------------------------------------------------------ >Live Security Virtual Conference >Exclusive live event will cover all the ways today's security and >threat landscape has changed and how IT managers can respond. Discussions >will include endpoint security, mobile security and the latest in malware >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ >_______________________________________________ >Emc-users mailing list >Emc-users@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
