Re: [CAD_CAM_EDM_DRO] Transformer suggestions.

In a message dated about 12/18/2004, John Labutski writes:

I need a source to purchase a tranformer for a linear power supply. I
would like about 50 to 65 volts and 12 amps for a stepper power supply supply.
Also I need a source for filter caps of the appropriate size and voltage
rating.<<
John: First, that's 600-780 watts. Even for three-axis, those would
unusually LARGE stepper motors! For bipolar-CHOPPER drives, it is amazing how
LITTLE current you actually need! For example, one typical KML (=high-torque)
Size 34 stepper, two-stack, is typically about 20 watts. One such motor might
draw 7 amps total, at 3 VDC. So a 60 V. supply would need to supply only
about 650 mA. Now, if your drives and steppers are old fashioned UNIpolar, you
may-well need 12 amps to heat up the room in which the ballast-resistors are
bolted.

While your call seems to indicate you are in CA, your NAME (?) says FL. If
you ARE in FL, the Marlin P. Jones firm (_www.mpja.com_ (http://www.mpja.com)
) in Lake Park has all KINDSA such stuff. If you are in CA, then JDR or
Jameco or "most of greater-LA" would surely have lotsa things like you need!
Capacitor for a 12 amp supply? A 25,000 to 40,000 µF 100 WVDC would be OK for a
motor-supply. If you use bipolar high-torque motors and Gecko drivers,
probably 5000 µF would do!







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