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Title: Torque shudder protection device and method

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.
 [1];  [2];  [3]
  1. (Schenectady, NY)
  2. (Malvern, PA)
  3. (Ballston Lake, NY)
Issue Date:
OSTI Identifier:
General Electric Company (Schenectady, NY) IDO
Patent Number(s):
US 5610490
Contract Number:
Research Org:
Ford Motor Co
Country of Publication:
United States
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