AC induction motors achieve NEMA’s super premium rating

June 5, 2024

Baldor-Reliance SP4 motors achieve NEMA’s super premium efficiency rating in a standard AC induction motor design that operates across the line as a standalone unit, independent of a variable speed drive (VSD). When paired with a VSD, even higher efficiency levels are attainable. SP4 was intended to reduce motor losses by an average of 20%, while maintaining the simplicity, form, fit and function of today’s installed base of AC induction motors. Their efficiency lets them run cooler, reduce heat-based energy losses, and extend the lives of bearings and other components.

SP4 motors meet current U.S. Dept. of Energy (DoE) efficiency standards, as well as anticipated Medium Electric Motor (MEM) regulations that will take effect in the U.S. on June 1, 2027. These regulations mandate that motors up to 100 hp must maintain NEMA premium efficiency, while motors between 100 and 250 hp must achieve NEMA super-premium efficiency.