2012/1/11 andy pugh <bodge...@gmail.com>: > On 11 January 2012 08:40, Viesturs Lācis <viesturs.la...@gmail.com> wrote: > >>> I have 3 servo motors and I am looking for appropriate servo drives for >>> them. > >> I have a serious problem finding a servo drives for these motors. > > I suppose you could try making your own? > http://uk.rs-online.com/web/p/motion-motor-control/6880723/ > > It should be possible to run one of those from a 3ppwm on a Mesa card
The price is such that I really could experiment with it. The problem is that I do not understand, what to do :)) I found manual on that page: http://docs-europe.electrocomponents.com/webdocs/0dca/0900766b80dca34c.pdf On page nr 9 I found a scheme of "Typical application connection". Do I understand correctly that anything within the blue frame already is on that board? Anyone willing to consult me? > The Granite drives should give you 3000rpm, is there any chance that > that is enough? Andrew provided me with this formula: EMF constant * RPM + Peak current * Terminal resistance = Voltage So it can be transformed as RPM = ( Voltage - Peak current * Terminal resistance) / EMF Constant I just am not sure, if AC or DC voltage is meant there. Motors' parameters are: > EMF Constant: 47,0 V/1000 > Peak Current: 7,2 A > Terminal Resistance: 12,7 Ω Max voltage for Granite drives is 160 VDC So max RPM would be 1000 * (160 - 7,2*12,7)/47 = 1458 RPM I really would like hit at least 2000 RPM for better max velocity - now I do not reach even 10m/min, which is not very fast for waterjet/plasma/laser machine. I might keep this in mind for case, if there really are no other options. > FWIW I am intending to run my 600W / 300V motors with 8i20s, but that > is mainly because I have some to experiment with. I don't yet know how > well it is going to work as I have been distracted by other projects. Any chance You might do some basic tests in a nearest future? That would give me some idea, if 8i20s might be used for the task. Viesturs ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
