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Torque shudder protection device and method

United States Patent

*** EXPIRED ***
March 11, 1997
View the Complete Patent at the US Patent & Trademark Office
Idaho National Laboratory - Visit the Technology Transfer and Commercialization Office Website
A torque shudder protection device for an induction machine includes a flux command generator for supplying a steady state flux command and a torque shudder detector for supplying a status including a negative status to indicate a lack of torque shudder and a positive status to indicate a presence of torque shudder. A flux adapter uses the steady state flux command and the status to supply a present flux command identical to the steady state flux command for a negative status and different from the steady state flux command for a positive status. A limiter can receive the present flux command, prevent the present flux command from exceeding a predetermined maximum flux command magnitude, and supply the present flux command to a field oriented controller. After determining a critical electrical excitation frequency at which a torque shudder occurs for the induction machine, a flux adjuster can monitor the electrical excitation frequency of the induction machine and adjust a flux command to prevent the monitored electrical excitation frequency from reaching the critical electrical excitation frequency.
King; Robert D. (Schenectady, NY), De Doncker; Rik W. A. A. (Malvern, PA), Szczesny; Paul M. (Ballston Lake, NY)
General Electric Company (Schenectady, NY)
08/ 548,064
October 25, 1995
The invention was made with Government support under contract number DEAC07-901D13019 awarded by the Department of Energy. The Government has certain rights in the invention.