On Fri, 13 Jan 2012 15:22:26 -0500 gene heskett <ghesk...@wdtv.com> wrote: > On Friday, January 13, 2012 03:00:21 PM Cathrine Hribar did opine: > >> Hi Gene: >> >> Tnx for the info on ur steppers. >> >> I have 8 wire steppers and have wired them series. From what you said >> about your steppers, and controller, you wired in parallel, true? >> >> My controller is, like yours, 2.8 amp limit. As I think about it, if the >> steppers are wired in series, like I wired mine, they would require >> twice as much current to give the most torque, right?. > > No Bill, wired in series, that is the current that flows through both coils > so you get 2x the magnetic field. > > Wired in parallel, it would need twice the current, because it would be > split between the 2 coils, each getting half the set current then, or 1.4 > amps. OTOH, the parallel wiring would, at a given supply voltage, be able > to run the motor nearly twice as fast at that same supply voltage, since > you would then have the full voltage across each coil. You would need a > slightly bigger supply in terms of amps, and a driver you could turn up to > 5.6 amps in order to get the best torque that speed. On The Third Hand, > its likely that the motor would run under the typical load, faster when > wired parallel, but a little drag will stall it easier too. > > The torque output would be lower but flatter, controlled by the available > current, with the fade knee starting at the applied voltage vs torque > intersection on the graph. > > It is also something I haven't experimented with a lot since my Z axis was > made to drive a drill bit, I can put 150 lbs of push on a stubborn bit > wired in series at 5"/min feed rates with low (200 or so) spindle rpms > cutting a decent sized continuous string out of the hole. > >> I use to think I understood what I was doing, but I find with age >> understanding don't always increase. > > Its painfully obvious to me at my years too Bill, it goes with the number > of calendars thrown out on our watches. 77 so far for me. > > Thanks Bill. > > Cheers, Gene > --
Tnx Gene for the feedback. Well I wired the steppers series when I set up the system. I guess I was hoping for more from these little motors. Ur wright, too many calendars, I've had 69 this year and only one heart attack!! thanks for the help Bill ------------------------------------------------------------------------------ RSA(R) Conference 2012 Mar 27 - Feb 2 Save $400 by Jan. 27 Register now! http://p.sf.net/sfu/rsa-sfdev2dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
