Re: [CAD_CAM_EDM_DRO] Re: Power Supply for 4-axis CNC stepper driver

Dave/Jon,

So, are we back to:
W = 4 x 60 x 6 x 0.66 or
W = 4 x 60 x 6 x 0.66 x 1.8?

The 1.8 is from Steve as quote below:
"Transformer manufacturers generally recommend that you compensate for this
by applying a factor of 1.8 times the desired DC output current to specify
the RMS current rating needed for the transformer."

Weedy

>>Hi Guys,
>>
>>I'm back and reading thru the posts.
>>
>>The basis starts that the namepalte current is used to hold in
>>posistion. Fine, that makes sense.
>>
>>Noboby argued with what Steve had said that more current is needed to
>>overcome the back EMF in the coil, so I'll work with that.
>>
>>
> OK, I'll argue. More VOLTAGE is needed to overcome the back-EMF.
>
>>and it seems the agreement is that more power is needed as the motor
>>is acelerated. This is interesting as over the years I have seen a
>>lot of people ask why their steppers are missing steps. This
>>certainly can be one reason.
>>
>>The motor we were discussing as 2.4 volts and 6 amps. and we were
>>using 60 volts as the DC power supply.
>>
>>Jon, you mentioned that an acelerating motor can go up to 60 * 7 * .66
>>
>>
> I'm not sure where the 7 comes from. Can you elaborate on this formula ?
>
> Oh, I guess I was thinking of the Gecko's 7 A maximum. In this case it
> would
> be 60 * 6 * .66
>
> Jon
>
>
>
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