That great info. Thank you! If they were 1-2 mH in unipolar mode, then when parallel connected for bipolar mode operation they should be closer to 2-4 mH, which is just about right.
I'll confirm this with an LCR meter. N. Christopher Perry On Aug 30, 2012, at 15:20, Steve Stallings <[email protected]> wrote: > The Superior Slo-Syn motors used by Bridgeport were > 8 wire M112-FJ series motors wired in a 6 wire unipolar > configuration. These motors should have an inductance > of between 1 and 2 mHenry per winding and were rated > for 9 amperes in unipolar mode. This is a guess based > on their product chart for standard models with similar > ratings. I do not know the exact motor used by Bridgeport, > or even if it was a custom. > > The Sigmas should be similar. > > If anything, the inductance may be borderline too low > for your Parkers. > > The typical stepper Bridgeport using original motors > will run 80 to 100 IPM using G203V drivers with a > 72 volt nominal power supply. The servo Bridgeports > like the Boss-8 would run about 200. Pushing things > beyond that would likely over stress the mechanicals. > > Regards, > Steve Stallings > >> -----Original Message----- >> From: N. Christopher Perry [mailto:[email protected]] >> Sent: Thursday, August 30, 2012 12:20 PM >> To: Enhanced Machine Controller (EMC) >> Subject: Re: [Emc-users] Bridgeport Stepper Inductance >> >> >> On Aug 30, 2012, at 11:05, Kirk Wallace >> <[email protected]> wrote: >> >>> On Thu, 2012-08-30 at 08:55 -0400, N. Christopher Perry wrote: >>>> I've got an old CNC Bridgeport Vertical Mill I'm looking >> to upgrade. >>>> I'm fairly sure it is a BOSS 5. It does have stepper motors on in, >>>> but haven't had a chance to check whether they are >> Superiors or Sigmas >>>> motors yet. Except for the motors, it looks exactly like this: >>>> http://img.photobucket.com/albums/v12/rockrat/new/DSC01640.jpg >>>> >>>> Anyway, I've got some Parker OEM650 stepper drives on hand >> and would >>>> like to use those for my retrofit, but they will only accommodate >>>> phase inductances of 1 - 10 mH. Does anyone know what the >> inductances >>>> are for the Superiors and Sigmas? >>>> >>>> N.C. >>> >>> Someone is bound to say this, so it might as well be me. >>> >>>> From what I hear, the original Boss stepper motor magnets >> where probably >>> the best they had at the time, but now are pretty awful. I would be >>> inclined to not put any money into the present steppers. I >> would try to >>> get it running with what you had on hand and see if you can >> live with >>> it, or go to a servo system (brushed or brushless). >>> >> >> I plan to, but I can't commit to swapping them out upfront >> while upgrading everything else in the system. >> >> N.C. >> >> -------------------------------------------------------------- >> ---------------- >> 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 >> [email protected] >> 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 > [email protected] > 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
