Quote Originally Posted by m_c View Post
Current and voltage has little to do with the reason.
DM/Q drives are older technology.
AM/EM drives are the latest technology, with the benefits of auto-tuning and anti-resonance. Both of which mean the drives have much better performance for any given power supply or motor. Stall detection is just an additional feature, which on dual motor axes, can greatly limit racking damage should a stall occur, and can also stop things on single motor axes, should something go wrong. You've got to remember, it's not just over tuning that can cause stalling, crashes can as well.
That is not entirely right. While the DM542T is not the absolutely latest and greatest, it is actually a 2017 product and is in production (by Stepperonline), while the AM882 is obsolete, but still sold, and is advised NOT to be used in new products. At least if we look at what Leadshine is saying about their products. The DM and DQ drivers are not the same, as far as I know, DM is original Leadshine, DQ is fake copy and Leadshine still makes the DM driver. The latest is the EM-S, which probably will replace the DM drivers one day. The DM542E is made by Leadshine and is from 2016 and is in production, the AM product line is no longer in production.

http://www.leadshineusa.com/product-...stepper-drives