On Thu, 4 Sep 2014, John Prentice (FS) wrote: > Date: Thu, 4 Sep 2014 13:50:23 +0100 > From: "John Prentice (FS)" <[email protected]> > Reply-To: "Enhanced Machine Controller (EMC)" > <[email protected]> > To: "Enhanced Machine Controller (EMC)" <[email protected]> > Subject: [Emc-users] Mixing BLDC and brushed motors > > Greetings > > > > This is probably a question for PCW but others might know or have dome it. > > > > I am looking at a small machine design where two axes will be BLDC motors > and one (or perhaps two) brushed DC. > > > > The BLDC motors suit a 7i39 very well (interfaced by a 5i20). Are there any > problems in using just two "phases" of another 7i39 to drive the brushed > motor? I presume that one would drive, say A, with the desired level > (positive or negative) holding inputs B and C at zero - i.e. no bldc > component is needed. >
Yes you can look at the 7i39 as 6 individual 1/2 bridges and drive 3 DC motors from one 7i39. if a brushed motor was connected to half bridges A and B, I _think_ what is needed is to drive A with the PID output and B with -PID output. You can also dedicate one 1/2 bridge output as a 1/2 way up reference and then run up to 5 small dc motors (1/2 voltage 1/5 current) from the other 5 1/2 bridges > > > The ideal card for the brushed motor would be a 7i40. Would it be > practicable to have Hostmot2 firmware for both 7i39 and 7i40 co-exist in the > 5i20? If so does a BIT file exist with this combination. > > Not sure if theres a standard bitfile for that but its easy copy-paste a pinout up and make one > > TIA > > > > John Prentice > > > > > > ------------------------------------------------------------------------------ > Slashdot TV. > Video for Nerds. Stuff that matters. > http://tv.slashdot.org/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ Slashdot TV. Video for Nerds. Stuff that matters. http://tv.slashdot.org/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
