Re: [CAD_CAM_EDM_DRO] Toroidal Transformer Help needed

John Heritage wrote:

>>2.5 KVA? So, you're retrofitting a 50-ton Cincinnatti bed mill, I
>>guess! If this is for a
>>Bridgeport-size machine, even a Series II, you are going WAY overboard
>>(unless this is
>>for powering a spindle motor.)
>>
>>
>
>Hi Jon,
>
> If I were designing a supply for a servo system, at a hobbyist level (no in
>depth heating and duty information available), would I just aim for the
>supply to be capable of outputting the peak rating of the servos
>continuously? To avoid the risk of it burning out.
>
>

Not unless you need more ballast for your boat. There is no need to provide
the full servo output continuously. Note - your MOTORS cannot accept peak
current continuously. Also, unless providing peak torque at maximum speed,
the servo amps will not draw full power from the supply. Most servo motors
can only deliver peak torque (=peak current) for a few seconds at a
time, due
to heating. Most bulk DC supplies (means no electronic regulation), given a
suitable capacitor bank, can deliver 2X rated current for the few
seconds that
the motors could handle it. So, a 50% reduction right off the bat is in
order.
Then, the capacitor bank can take up some of the slack. I think in most
cases
of a milling machine, a 25% of max rating will usually STILL be sufficient.
(For routers, 50% might be safer, as they run at much higher speeds.)

> I am having bad thoughts and twidling a screw driver now whenever I look at
>my el cheap ass no name MIG set. :^)
>
>

Good way to reduce everything to a smoking heap of slag! A MIG is lots of
current at low voltage, and no filtering.

Jon