RE: [CAD_CAM_EDM_DRO] wire for motor ?

Hi Dave,

If it were 28g solid wire then it has about 68 Ohms resistance per thousand
feet. If you have a six foot cable then the resistance is 0.4 ohms. Your
3V 3A motor has a DC resistance of 1 Ohm. Total resistance is therefore
about 1.4 ohms.

Since your driver measures the current through the wire and the motor and
will be set up to provide 3A it will result in 3.6W of power dissipated
across the wire.

If you made up a cable using 18g wire it's 6.3 ohms per 1000 foot. Or 0.0063
per foot. Power dissipated across the wire is now 0.06W.

John Dammeyer



Wireless CAN with the CANRF module now available.
http://www.autoartisans.com/products
Automation Artisans Inc.
Ph. 1 250 544 4950

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of turbulatordude
> Sent: Sunday, December 10, 2006 8:56 AM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] wire for motor ?
>
>
> 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
>
>
>
>
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