Re: [CAD_CAM_EDM_DRO] Re: Jerrys Power Supply.pdf

Hm, frequent topic on here (how big should the supply be).

I believe the consensus is

(motor plate current * 2) * 0.667

if you are using a bipolar chopper drive (such as a Gecko). The * 2 is
because there are (up to) two windings on at a time. Others will pounce
if this is incorrect / subject to discussion.

Voltage can be up to the rated voltage of the drive, minus a fear
factor (10%?).

The capacitor for the supply should be

(80 000 * current in amps) / voltage

So for the 48v @ 10 amp supply, that would be about 16 000.

Note too that capacitors in parallel add the capacitance (in Farads),
and capacitors in series add their voltage. In other words, if you find
two cheap 63v @ 8 000 uF capacitors and connect them in parallel, it's
the same as an expensive 63v @ 16 000 cap.

You also need a resistor across the supply to bleed off the capacitor's
charge. You can use a resistor between 500 and 1 000 ohms at 10 watts.

Regards,
JJ

On Tuesday, Feb 10, 2004, at 12:15 US/Eastern, machinist24540 wrote:

> Thanks, John.
> Do you think that would pull all 3 (1150 oz-in) steppers
> simultaneously?
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, John Johnson <johnatl@m...>
> wrote:
>> The transformers are 10 amps, the rectifier is 12 amps, so the
> weakest
>> link is the transformer.
>>
>> If transformers are connected in series (adding), then voltage out
> is
>> the sum of the voltages. The current is that of the lowest rated
>> transformer. When connecting in parallel, the current is the sum
> of the
>> currents, The voltage of all transformers in parallel should be
> the
>> same, and that will be the output voltage.
>>
>> The schematic doesn't show any fuses. I sprinkle them about
> liberally.
>> One on each input leg of the transformer, one on each output leg
> of the
>> transformer, and one on the DC in for each driver.
>>
>> Regards,
>> JJ
>>
>> On Sunday, Feb 8, 2004, at 20:03 US/Eastern, machinist24540 wrote:
>>
>>> Hello,
>>> Can anyone tell me how many amps the power supply in the files
>>> section Jerrys Power Supply.pdf will put out? It is under the
>>> circuits folder.
>>> I am looking to hook up a rotary table that usus a standard
>>> Bridgeport stepper motor.
>>> Also would it power a 3 or 4 motors if I used it to upgrade
>>> my BOSS 3?
>>> Thanks,
>>> John
>>>
>>>
>>>
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