Re: [CAD_CAM_EDM_DRO] Re: FS: New 4 axis microstepping driver $45.00 USD

Mariss Freimanis wrote:

>Fred,
>
>Probably very little. Energy stored goes up as the square of RPM, the
>purpose for that speed is to simulate what gets stored in the
>leadscrew, and to a lesser extent, the mass moved by the screw. The
>best way to tell is to run a single drive and scope the supply
>voltage under actual running conditions.
>
>I ran some tests using a large NEMA-34 motor spun up to 6,000 RPM
>using a 48VDC supply. The stored energy was 35 Joules, of which 22J
>were converted back to electrical energy.
>
>

GASP! 35 J, with 22 returned electrically! WOW!

Of course, I've never seen any stepper, let alone a NEMA-34 size, spin
at 6000 RPM. I was VERY impressed seeing a size 34 motor spin at
1440 RPM when I got my Gecko 201A drives hooked up to my universal
stepper controller board. I didn't see much of a voltage spike when the
motors slowed. I also had a number of stalls due to mechanical binding
in the driven machine, but had no problem with the G201's. Of course,
a 36 V supply leaves plenty of margin for the Gecko drives.

Jon