On Friday, January 13, 2012 07:42:17 PM Cathrine Hribar did opine: > 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
I haven't had any heart attacks the sawbones types have detected, but they do tell me that us diabetics usually roll the dice daily. I replied that's damned encouraging now, isn't it? But I have faith, I made some arrangements this summer to try & get the boys together for my 80th. They are all in Nebraska or Kansas, so it'll be a slight logistics problem to get them 'all in the same sock' in another 3 years, and I signed a contract & wrote a check to Orkin to keep the termites cleaned out of here till at least 2016. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Patriotism is the virtue of the vicious. -- Oscar Wilde ------------------------------------------------------------------------------ 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
