Are all closed-loop stepper systems created equal?

How do I get the right control for my application?
Manufacturers apply the term "closed-loop stepper" to a wide array of controls. Here, we'll spell out how the three most common closed-loop stepper control schemes work and highlight their advantages and disadvantages.

Are all closed-loop stepper systems created equal?
No. Some manufacturers give the closed-loop stepper systems similar-sounding descriptions, which confuses the marketplace. As proof of the confusion, it's not uncommon that a designer requests one capability and actually needs another.

What are the most common closed-loop stepper systems?
There are three common types: Closed-loop stepper with step-loss compensation; closed-loop stepper with load position control; and closed-loop stepper servo control. Stepper-drive manufacturers call them all "closed loop" but the three have distinct functionalities.

What are the functionalities of these closed-loop stepper systems?
Closed-loop stepper with step-loss compensation is the most common type of closed-loop stepper control. The analog stepper driver operates as a micro-stepping drive and typically receives pulse and direction commands to move to the desired position. An encoder tracks shaft or load position. If lost steps are detected, a compensation algorithm inserts additional steps so that the motor shaft (or load) arrives at the desired position.

How do I get the right control for my application?
Machine builders must ask: Which control scheme does the application require? It may not be immediately apparent which control scheme the drive uses. Therefore, ask the manufacturer for details and review the documentation to ensure you get the right control scheme.

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