Re: [CAD_CAM_EDM_DRO] wire for motor ?

Hello Dave,

For a short wire length, like 6 feet, I would skip the math and use the
same gauge wire as the stepper leads.

For something long, like a hundred feet, I would do the math to find out
where my losses are.

I like to keep wire resistance less than 1% load resistance so that I
can pretty much ignore wire losses. So for a 1 ohm motor coil I would
want my wire to be less than 0.01 ohms. Wire catalogs often list wire
resistance as ohms per foot, or more often as ohms per 1000 feet. Pick a
wire guage, determine its resistance per foot, multiply by the length in
feet. Is this resistance very small compared to the load resistance?

Tom Hubin
thubin@...

*************************

> Hi all,
>
> I used a db9 connector for an connector on my SLA7062 driver. I hope
> to use 34 volts and up to 3 amps.
>
> I was hoping to also use a store bought db9 cable. Unfortunatly,
> they seem to not have any wire ga listed (wadda-ya want for $1.99)
> but it seems that 28ga is common.
>
> The question is about wire rating.
>
> how do you rate wire when using a stepper that has a chopper or PWM
> circuit ?
>
> If the motor is 3 volts and 3 amps, is the total wire wattage 9 watts
> ?
>
> Dave