Kirk Wallace wrote: > On Tue, 2008-07-08 at 11:53 -0500, Jon Elson wrote: > ... snip > >>If the encoders are inscrutable proprietary ones that mix the >>index and commutation signals like Yaskawa does, then Renco has >>some really nice 2.1" encoders with 6 channels (ABZ and UVW for >>commutation signals.) >> >>Jon > > > Would you happen to have a model number or link for the Renco encoders? The link is a little long, but the model # is the RCM21, the C is for commutation.
<http://www.renco.com/index.php?WCMSGroup_8_3=12&WCMSGroup_4_3=8&WCMSGroup_12_3=160&WCMSArticle_3_160=113> I see they now also have an RCML15, a smaller encoder also with commutation, and it sells for $68! Wow! > How do ABZ (quadrature with index) differ from UVW? UVW sounds like > some sort of three phase thingy. > Yes, the UVW are the commutation signals, and tell a siz-step drive what polarity to drive on which motor pins. Most newer motors are designed for sinusoidal drive, but some work fine with six-step. The ones that don't work so well have vibrations at about 150 RPM. Yaskawa uses a proprietary 3-channel scheme, where the C channel looks just like the A and B channel, but its phase shift from those channels tells what sextant of the motor's rotation it is in, thereby giving the commutation info in with the index pulse. Jon ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
