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Fuel Cells

Starter-generator-system-with-variable-frequency-exciter-control

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Starter/generator system with variable-frequency exciter control

Details

Inventors: Rozman, Gregory I.; Markunas, Albert L.; Nuechterlein, Paul E.;
Assignee: Sundstrand Corporation (Rockford, IL)
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Ponomarenko; Nicholas
Attorney, Agent or Firm: Marshall, O'Toole, Gerstein, Murray & Borum

A control for a brushless generator is operable in a starting mode of operation to convert electrical power into motive power for starting a prime mover. The control applies AC power to an exciter field winding at a first frequency at the initiation of a start sequence and thereafter decreases the frequency of the power applied to the exciter field winding during the start sequence.

DETAILED DESCRIPTION In accordance with the present invention, a control for a brushless generator avoids the problems noted with respect to the prior art in a simple and inexpensive fashion.
More particularly, according to a first aspect of the present invention, a control for a brushless generator having a main generator portion and a permanent magnet generator (PMG) includes an exciter having an exciter field winding disposed in a stator of the generator and an armature winding disposed on a rotor on the generator and coupled to a main generator portion field winding.
First and second power converters are provided wherein each power converter includes an input and an output.
Means are operable in a starting mode of operation for coupling a source of electrical power to the inputs of the first and second power converters, the output of the first power converter to the main generator portion armature winding and the output of the second power converter to the exciter field winding.
The coupling means is further operable in a generating mode of operation for disconnecting the source of electrical power from the first and second power converters and connecting a voltage regulator to the exciter field winding and the input of one of the power converters to the main generator portion armature winding.
Means are coupled to the first and second power converters and operable in the starting mode for controlling the power converters such that the first and second power converters 10 provide first and second AC waveforms at first and second frequencies to the main generator portion armature winding and to the exciter field winding, respectively, at the beginning of the start sequence and such that the second AC waveform changes to a third frequency less than the second frequency after the beginning of the start sequence.
The controlling means are operable in the generating mode for controlling the power converter coupled to the main generator portion armature winding such that AC power is produced at the output of such power converter

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