Patent Number: 6,166,513

Title: Four-quadrant AC-AC drive and method

Abstract: An electric drive apparatus and method for controlling medium-voltage alternating current motors wherein a multi-phase power transformer having multiple secondary windings provides multi-phase power to multiple power cells which provide four quadrant operation. Each power cell has a single-phase output and is controllable by a modulation controller. The power cells are connected in series thus permitting the maximum output voltage for each cell to be less than the maximum line-to-line voltage. Each power cell can have a rectifier portion to convert input AC-to-DC, capacitors, an output DC-to-AC inverter, a regenerative bridge converter connected in parallel with the rectifier portion and a local modulation controller connected to a master controller.

Inventors: Hammond; Peter W. (Greensburg, PA)

Assignee: Robicon Corporation

International Classification: H02M 7/797 (20060101); H02M 7/48 (20060101); H02P 23/06 (20060101); H02M 7/66 (20060101); H02P 007/36 ()

Expiration Date: 12/26/2017