James E Gustafson

US Patent:

7332884, Feb 19, 2008

Filed:

Jul 16, 2004

Appl. No.:

10/893462

Inventors:

Gregory I. Rozman - Rockford IL, US
Kenneth Marks - Southwick MA, US
James R. Gustafson - Granby MA, US
Douglas Parsons - Canton CT, US

Assignee:

Hamilton Sundstrand Corporation - Windsor Locks CT

International Classification:

H02P 7/00

US Classification:

318432, 318434

Abstract:

An electric start system () includes a controller () that controls operation of a motor () used to start a device such as a gas turbine engine (). In one example, the controller () determines when an acceleration rate of the motor () is outside of a desired range and dynamically controls the acceleration rate. In another example, the controller () determines when the motor () is disengaged from the engine () and controls a torque reference value to facilitate smoother reengagement. In another example, the controller () provides an initial starting torque value that allows for soft starting capabilities of the motor ().