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Gas turbine engine starter-generator exciter starting system and method including a capacitance circuit element
| Details |
Inventors: Xu, Mingzhou; Pearson, Wayne T.; Yao, Yuan; Lengel, Jim; Anghel, Cristian E.;
Assignee: Honeywell International, Inc. (Morristown, NJ)
Primary Examiner: Schuberg; Darren
Assistant Examiner: Cuevas; Pedro J.
Attorney, Agent or Firm: Ingrassia Fisher & Lorenz
A rotating electrical machine, such as an aircraft starter-generator, that includes an exciter that has its stator windings supplied with electrical power from a power supply. One or more switches are electrically coupled between the exciter stator winding and the power supply and are configured and controlled so that a capacitance may be selectively placed electrically in series with the exciter stator windings. |
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DETAILED DESCRIPTION The present invention relates to a gas turbine engine starter-generator that, when operating as a motor, can generate torque that is sufficiently high to start an aircraft engine.
In one embodiment of the present invention, and by way of example only, a gas turbine engine starter-generator includes a housing, a shaft, a main rotor, a main stator, an exciter rotor, an exciter stator, a power supply, a capacitance element, and a control circuit.
The shaft is rotationally mounted within the housing.
The main rotor is mounted on the shaft, and the main stator is mounted within the housing and is located at least partially around at least a portion of the main rotor.
The exciter rotor is mounted on the shaft, and the exciter stator has windings wound thereon and is mounted within the housing and is located at least partially around the exciter rotor.
The power supply is electrically coupled to the exciter stator windings.
The control circuit is operable to selectively electrically couple the capacitance element in series between the power supply and the exciter stator windings.
In another exemplary embodiment, a motor/generator includes a rotationally mounted main rotor, a stator, an exciter, a power supply, a capacitance element, and a control circuit.
The main stator is located at least partially around at least a portion of the main rotor.
The exciter includes a rotor configured to rotate with the main rotor and a stator having windings wound thereon.
The power supply is electrically coupled to the exciter stator windings.
The control circuit is operable to selectively electrically couple the capacitance element in series between the power supply and the exciter stator windings.
In still another exemplary embodiment, a method of operating a starter-generator in a generator mode and a motor mode in an aircraft starter-generator that includes at least an exciter assembly having a stator with windings wound thereon.
AC power is supplied to the exciter stator windings via a first electrical path having a capacitance element electrically coupled in series therein, to thereby operate the starter-generator in the motor mode
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Electrical and Wave 
