‘Real’ high-voltage motors

Large, high power ac induction and synchronous motors top out at 15 kV electrical input. My November 2004 article looks at innovation in this technology sector.

By Control Engineering Staff November 17, 2004
ABB’s very high voltage motor (foreground) connects directly to an electrical grid, unlike a conventional motor that requires an intermediate transformer.

Large, high power ac induction and synchronous motors top out at 15 kV electrical input. My November 2004 article looks at innovation in this technology sector. As of this writing, one manufacturer has introduced ac synchronous motors working from input voltages up to 70 kV to cut power losses and obtain other benefits by direct connection to a utility distribution line. Others may be considering high voltage offerings.

The article highlights very high voltage (VHV) synchronous motors of 4- and 6-pole design, supplied by ABB Automation Technology Products AB of Sweden, which has two installations already in place in rugged industrial settings. A patented, innovative stator winding design is at the heart of this innovative development. A sidebar discusses what actually is “high voltage.”

—Frank J. Bartos, executive editor, Control Engineering, fbartos@reedbusiness.com