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

Thanks Tim



Jeff


-----Original Message-----
From: Tim Goldstein [mailto:timg@...]
Sent: Saturday, February 15, 2003 3:32 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: 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

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