Re: stepping motor driver, 8-pack, Phytron-ECT

[Markus <markus.schwoerer@anl.gov>]

On Mon, Feb 19, 2001 at 02:42:04PM -0600, Mark Rivers wrote:

> 
> Note that the Lincos drivers look nice, they are linear (quiet) and they can
> microstep up to 20 microsteps/step.  However, they can only drive 2.5 amps
> per phase.  If you want to drive larger motors you need to use the ZSO

But, they can run down to 0.25 Amps without burning motors

> drivers.  However, those are choppers, so they will probably not be
> electrically quiet.

Phytron claims that using appropriate shielding of the cables avoids noise.
I have not heard such about the ACS microstepper.

> 

StepPack runs hot at > 5 Amps running current, requires additional cooling
which is provided within the chassis of Phytron. For StepPack it takes extra
space.
The same is true for the power supply. ACS PS takes as much space as a driver
rackmount, therefore, requires taller racks. ACS PS supplies 25 Amps, while
Phytron build-in PS provides 20 Amps for the ZSO.
 
> On our beamline >75% of the motors are more than 2.5 amps/phase, so ZSO's
> would be needed.
> 
> Note also that on the Step-Pak you can mix and match different drivers
> (microstepping, unipolar, bipolar) in a single chassis.  I don't think you
> can do that with either proposed Phytron unit, so you would need a complete
> rack to service a single microstepping motor.
> 
> If the issue is price we should we ACS to bid against Phytron and give us
> quantity discounts like they are.  Their single unit prices are no better.

The issue is price and quality which is not well matched concerning ACS drivers.

 Markus

-- 
Dr. Markus Schwoerer-Böhning
Carnegie Institution of Washington, High Pressure CAT
c/o Argonne National Laboratory, Bldg. 434-E
9700 S. Cass Ave.
Argonne, IL 60439

Tel.: (630)-252-0411
Fax.: (630)-252-0496
e-mail: markus.schwoerer@anl.gov