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<== Date ==> <== Thread ==>

Subject: Re: Stepper Motor Controllers
From: Mark Clift <[email protected]>
To: "[email protected] ([email protected])" <[email protected]>, "[email protected]" <[email protected]>
Date: Tue, 14 Jul 2015 09:26:10 +0000
Hi Mark,

Another interesting feature of the Delta Tau is it can run a PID algorithm and close the loop around a stepper without an encoder.  Adding an encoder and closing the loop on that is also possible.

With the Galil, steppers are run in open loop mode.  A stepper position maintenance mode is available which is similar to the motor record retry facility.  When using a Galil if you want true closed loop control of a stepper you must have an encoder, and a motor amplifier such as the Technosoft that allows the stepper to be controlled as a servo (Galil configured for servo mtr).  I've got many stages running this way, and the performance is good.  Using a servo motor, the Galil runs true PID, like most controllers now days.

Best wishes,

Mark

Dr. Mark Clift
Senior Controls Engineer
Australian Synchrotron
800 Blackburn Road
Clayton 3168
Ph: +613 8540 4264
Fax: +613 8540 4200

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