Re: [CAD_CAM_EDM_DRO] Re: CNC Stepper Power Supply Q's???

Mark,

You have it correct, the next step up from 620 VA. I get my transformers
from Plitron in Canada. www.plitron.com

I usually over rate my bridge rectifiers. I buy them at a local surplus
store. In your case, I would buy one rated at 100 volts and 25 amps.

----- Original Message -----
From: "Mark" <markatswat@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, September 24, 2002 9:13 AM
Subject: [CAD_CAM_EDM_DRO] Re: CNC Stepper Power Supply Q's???


>
>
> No that was excellent. So from what your paper stated, and near as I
> can tell what I want is about a 50 VAC output from the transformer
> and roughly a 750 VA Transformer since the motors are 6.2 Amp motors.
>
> So we get 6.2 * 3 = 18.6 Amps * .667 = 12.4 Amps
> 12.4 Amps * 50 Volts = 620 VA Or should I multiply by 70?
>
> As for the Capacitor It appears that I need
>
> (80000 * 12.4)/70 = 14,171 uF of capacitance at 70 Volts. Apparantly
> there is no penalty for having more capacitance than required?
>
> Finally should the Bridge Rectifier be rated on the Input Voltage or
> Output Voltage, I assume output voltage?
>
> Thanks,
>
> Mark
>
>