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It's OK. If you have further problem or have any interest with Leadshine hybrid servo(closed loop stepper) products, please kindly contact me at [email protected] or visit Leadshine Technology...

I checked with Leadshine R&D and the hybrid servo(clsoed loop stepper) products only support relative encoder type now. The absolute type product is in the process.
I have met some CNC machine...

Hi, Leadshine closed loop stepper products are named as Hybrid Servo Drives and Hybrid Servo Motors. (Hybrid Servo=Closed Loop Stepper) So check the website and find hybrid servo system products.

Actually, it's hard to add the encoder to the stepper motor by yourself if you are not motor manufacturer for the airproof reason. As I said previous, you can add a linear scale to your machine...

One way, you can add a linear scale to your machine as a position feedbakc closed to your motion controller (e.g. PMC).
Another way, by implementting high resolution encoders to update the motor...