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1. (WO1994028616) METHOD OF TORQUE NOTCH MINIMIZATION FOR QUASI SQUARE WAVE BACK EMF PERMANENT MAGNET SYNCHRONOUS MACHINES WITH VOLTAGE SOURCE DRIVE

Pub. No.:    WO/1994/028616    International Application No.:    PCT/US1994/005813
Publication Date: Dec 8, 1994 International Filing Date: May 20, 1994
IPC: H02P 6/10
Applicants: ELECTRIC POWER RESEARCH INSTITUTE, INC.
Inventors: McCLEER, Patrick, J.
LAWLER, Jack, S.
NARASIMHAMURTHI, Natarajan
Title: METHOD OF TORQUE NOTCH MINIMIZATION FOR QUASI SQUARE WAVE BACK EMF PERMANENT MAGNET SYNCHRONOUS MACHINES WITH VOLTAGE SOURCE DRIVE
Abstract:
A method for smoothing the torque characteristics of a multi-phase PM synchronous machine by controlled driving with a conventional voltage source inverter operated in accordance with a predetermined switching sequence wherein the sum of the excitation voltages applied to the incoming phase winding and outgoing phase winding are maintained constant at a predetermined value for the duration of each commutation period. In addition, the individual excitation voltages applied to the remaining phase active windings are also held constant during the commutation period.