In Europe, they are in the process of developing new lines of compressors that use brushless dc motors and inverter drives to run them. Check out these leaflets:
http://www.emersonclimate.com/europe...-EN-1410_1.pdf
Copeland Scroll
It looks like they are putting most of their eggs in the r-410a basket, at least for the larger-than-a-fridge range.
Copeland Scroll Variable Speed Technology