While standard efficient motors can no longer be manufactured, Nidec says many groundwater pumping applications are still best served by constant speed motors; others require variable speed. Nidec Motor Corporation stocks two Nema Premium efficient VHS product lines from 7½ to 600 horsepower — inverter duty and the new U.S. Motors brand SineWave Optimized. Sinewave Optimized motors provide a lower cost alternative to inverter duty for constant speed pumping applications. www.nidec-motor.com