Method to re-engage start of dynamoelectric machine

Details Method to re-engage start of dynamoelectric machine Method to re-engage start of dynamoelectric machine

2007-10-04

2010-10-12

Cuff, Michael (Department: 3741)

Power plants

Combustion products used as motive fluid

Combined with starting feature

C290S052000

Reexamination Certificate

active

07810337

ABSTRACT:
A method of starting a gas turbine engine with a synchronous multiphase alternating current (AC) dynamoelectric machine with a rotor and a stator that allows re-engagement of a starting operation at non-zero rotor speeds comprises the steps of: applying electrical excitation to the rotor; measuring electromotive force (EMF) generated in the stator; determining rotor speed, acceleration and position from the measured EMF by sensorless means; initiating closed-loop sensorless position controlled power to the stator if the determined rotor speed is at least a pre-determined minimum closed-loop sensorless re-engagement speed; initiating open-loop position controlled power to the stator if the determined rotor speed is less than the pre-determined minimum closed-loop sensorless re-engagement speed but at least a predetermined minimum open-loop re-engagement speed and the determined rotor acceleration is no more than a pre-determined maximum open-loop re-engagement acceleration; and initiating open-loop zero-speed start power to the stator if the determined rotor speed is less than the predetermined minimum open-loop re-engagement speed.

REFERENCES:
patent: 4093869 (1978-06-01), Hoffmann et al.
patent: 4743777 (1988-05-01), Shilling et al.
patent: 7034497 (2006-04-01), Markunas et al.
patent: 7288910 (2007-10-01), Dooley
patent: 7334854 (2008-02-01), Chang et al.
patent: 7501799 (2009-03-01), Rozman et al.

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