Re: [CAD_CAM_EDM_DRO] Stepper Motor Driver

Jon Elson wrote:

>Blue wrote:
>
>
>
>>Hi,
>>
>>I was going to use this driver with 50oz motors of 1 amp using a power
>>supply of about 20 volts. The machine would be quite small for
>>drilling/routing circuit boards.
>>
>>
>>
>>
>Well, you would need to add resistors. A 1 Amp/winding motor would not
>have a 20 Ohm winding resistance, or it would go up in flames.
>So, you would need to add 2 resistors of about 19 Ohms (assuming the
>motor drops about 1 V at 1 A) at 360 W. Each motor/drive combination
>would need 720 W from the power supply, so a 3-axis system would draw
>over 2 KW!
>
>

Oh oh! I made a mistake there. It would only be 19 W per resistor. Maybe
a 20 Ohm 25 W resistor would be fine. The power supply would still need to
deliver ~40 x 3 = 120 W even at idle.

Jon