Re: [CAD_CAM_EDM_DRO] stepper reluctance

The thing is this...

Chopper drivers allows you to run at a higher voltage without burning the
motors. If you don't use chopper drivers, the current drain raises rather
slow when a coil is powered up. By using a chopper drive, you yank the power
up to 4 to 20 times the rating on the motor, and this makes the current rise
much faster. Therefor you can run the stepper faster (more steps pr. sec,
typically 3-4 times faster) then with a conventional power source.

That make sence? If not, read the prober explanation at
http://www.cs.uiowa.edu/~jones/step/current.html

--Michael

----- Original Message -----
From: "echnidna" <echnidna@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, September 29, 2002 4:51 AM
Subject: [CAD_CAM_EDM_DRO] stepper reluctance


> Hi group,
> given that motor reluctance governs maximum motor speed.
> what is the advantage of chopper drive at high frequency which means
higher impedance?
> wouldnt a simple linear current control be more effective by avoiding very
high chopper frequencies?
>
> Regards
> bob Thomas
>
>
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