Re: QUESTION ABOUT SERIES OR PARALLEL ON STEPPER MOTORS - ref post 52721

The serial vs. parallel speed question was tossed around by the pros
from Dover a little while back.

This is real close of an explanation. if you want more, read the
whole thread.


Message 52721 "jeffalanp" <xylotex@h. . . > Date: Tue Nov 19, 2002
12:56 am Subject: Re: Running Unipolar steppers with a Bi-polar
driver?

"Mariss, OK, OK, I got it (I think). The inductive time constant for
both parallel and series motors will be the same (t=L/R, the time it
take to get to 62. 3%). But to overcome the increased inductance and
resistance in a series wound motor (compared to parallel), I would
need to double the voltage to achieve the same time as parallel. "

There was more on the post, time to charge the coil, discharge it,
then reverse direction, that sort of stuff. but this is enough data
for most of us to understand the differences.

Or the short and sweet, series goes thru a longer wire and that takes
more time. You can did deeper and get more data.

Dave





--- In CAD_CAM_EDM_DRO@yahoogroups.com, Alper YILDIRIM
<yildirimalper@y...> wrote:

> Hi,
> Take a look to the following site:
>
> http://www.microkinetics.com/contab.html
>
> For the bipolar series and parallel connections the
> time constant L/R is same. For parallel connection,
> inductance lower 4 times but resistance lowers 4 times
> too. So the time sonstant does not change.
> Can someone explain why parallel wiring allows higher
> speeds according to this approach.
>
> Best regards
> Alper
>
> Jon wrote:
>
> ""Yes. In almost all cases, the parallel connection
> is better. It
> provides lower inductance,
> and therefore, higher speeds, than the series
> connection. The only
> time
> to use series
> is if your stepper driver cannot supply the current
> needed for parallel
> connection, and
> if high speed is not important. (The fix is to get a
> driver that CAN
> handle full rated
> current in the parallel mode.)
> Jon""
>
>
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