Nidec Motor
This vertical inverter-duty motor is available off-the-shelf
To respond to the growing demand for variable speed motors used to drive vertical pumps in municipal and industrial applications, this company now stocks a line of totally enclosed-fan-cooled Corro-Duty Vertical HollowShaft Inverter Duty Motors (photo). These “U.S. Motors” brand motors are cast iron, and designed with full Class H insulating materials to withstand the steep-wave-front voltage impressed by the VFD waveform. They are designed to run smoother and cooler on inverter power supplies, which can lead to improved system efficiency and reliability. The motors are NEMA Premium Efficient, and are available in 5–300 hp, with two and four poles (3,600 and 1,800 rpm), and with frame sizes 184–449. — Nidec Motor Corp., St. Louis, Mo.