RE: [CAD_CAM_EDM_DRO] Re: QUESTION ABOUT SERIES OR PARALLEL ON STEPPER MOTORS - ref post 52721

At 25X over voltage it will run quite hot. At more voltage it will run
even hotter. The 25X value is empirically derived as the general upper
limit based upon the motor heating. It is not a absolute limit, but you
have to consider the potential you will damage the motor by over heating
it. Personally I find that even at 25X the motors run hotter than I
like. Not that it is beyond the spec, but I don't like having the motors
at a temperature that will cook meat. If it was my machine I would
likely set it up with 36 - 48 v and wire it as half coil. Series will
seriously limit your max RPM and parallel takes a lot of amps. Half coil
cuts the amps while giving almost all the speed of parallel.

Tim
[Denver, CO]
Sherline products at Deep Discount
Mach1 & DeskCNC with credit card ordering
www.KTMarketing.com/Sherline
Now selling Visual Mill

> -----Original Message-----

> The nameplate on his motor rates it at 2.1 volts and 9.2 amperes.
>
> Is it OK to drive this at 62 volts DC? I read that the
> voltage should not exceed 25 times the rated voltage which
> would be 52.5 volts.
>
> Since the application is a direct connection to the XY and Z
> axis of a Bridgeport Milling machine, (and since the drive
> tops out at 8 amperes) is it better to try running it at 8
> amperes in parallel or at 4.5 amperes in series?
>
> Again, thanks much for all your help.
>
> Jeff