Re: [CAD_CAM_EDM_DRO] Digest Number 2799
Posted by
Tony Jeffree
on 2002-12-23 03:25:06 UTC
At 07:52 23/12/2002 +0000, you wrote:
dissipation in the coils as you would get by using the half coil rating.
50% of the half coil rating results in the same number of amp-turns
(therefore the same torque) but the motor runs cooler. And as Mariss keeps
saying, if you up the current to 71.5% and use a microstepping drive, you
may find that the microsteps are no longer linearly spaced.
Regards,
Tony
>I have seen the numbers in a couple places now. both the 71.5% andThe difference arises because derating by 71.5% results in the same heat
>50%.
>
>Is the half figure based on double coil area, without adding anything
>for losses ?
>
>any idea why the big difference ?
dissipation in the coils as you would get by using the half coil rating.
50% of the half coil rating results in the same number of amp-turns
(therefore the same torque) but the motor runs cooler. And as Mariss keeps
saying, if you up the current to 71.5% and use a microstepping drive, you
may find that the microsteps are no longer linearly spaced.
Regards,
Tony