RE: [CAD_CAM_EDM_DRO] Re: High Voltage servo cards

It’s a big Avon, bigger than a BP much more rigid, much heavier and the
motors are what came with it.

The motors normally fetch over £1000 each second hand, so they are that
bullet proof I’d like to keep then.

I did look at dropping the voltage and running gecko’s or something similar,
but if I run then up at 80V, they don’t sound half as good as they do with
160V, and yes I know that’s no real reasoning, but really if groups are
selling HV servo cards, they should be as reliable as the 80V ones. There
are actually more complaints out on news groups about gecko’s than rutex.



Dr. Mark Vaughan Ph'D. B.Eng. M0VAU

Managing Director

Vaughan Industries Ltd, reg in UK no 2561068

Water Care Technology Ltd, reg in UK no 4129351

Addr Unit3, Sydney House, Blackwater, Truro, Cornwall, TR4 8HH, UK.
Phone/Fax 44 1872 561288

RSGB DRM111(Cornwall)

_____

From: CAD_CAM_EDM_DRO@yahoogroups.com
[mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Polaraligned
Sent: 02 April 2007 00:44
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: High Voltage servo cards



--- In CAD_CAM_EDM_ <mailto:CAD_CAM_EDM_DRO%40yahoogroups.com>
DRO@yahoogroups.com, "Mark Vaughan" <mark@...> wrote:

>

> My motors are SEMMT30U4-57's,
>
> 57V/1000PM, 140V but I have a 160V supply which SEM say is still OK,
>
> 40lB/in TENV stall torque, at 8.3 amps without forced cooling.
>
> Peak stall talk 192lb/in at 47 amps, Armature 1.1 Ohm less brushes,

8.1mH

>
> Do you see any problems here.

What size mill do you have that you need these monster motors?
Even a BP Series 2 will run just fine with 28 in-lb continuous
torque motors with a 2:1 ratio.
Gecko's will run these motors just fine although you will sacrafice
speed due to the 80v limit. Ron Rogers runs this size motors on his
BP using Gecko's- in a commercial enviroment. He seems to not have
any problems.
I am not suggesting using Gecko's, just making a point that a
drive rated much lower voltage and current will run those motors.

Scott





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