Re: [CAD_CAM_EDM_DRO] Re: Electrical wizards

Thanks John,

I took a look at some of the "charts" for torque and speed of a few different motors.
I see where it does not double, at least across the board. Some motors do better than
others though. Clearly they all exhibited a bit more torque at higher speeds.

It would appear that More can be better.

Chris L

Jon Elson wrote:

Not really. You can't double the torque, as the steppers are almost

> certainly already operating (at zero speed) at their rated current.
> The torque falls off rapidly as the motors accelerate, and especially
> on bipolar drives, a higher voltage allows them to reverse the current
> flow in the windings faster, and therefore develop more torque at
> higher speeds. I don't think you can really get a 1:1 improvement,
> ie. doubling torque at some speed when you double voltage. You
> may get close to that if the existing power supply voltage is really
> marginal, though. You also generally increase heat in the driver AND
> in the motor at higher voltages, due to eddy and hyseresis losses
> in the iron, primarily.
>
> Jon
>
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