Elliott Energy Systems, Inc.

Chromalloy Gas Turbine Corporation

Douglas R Burnham

J Michael Teets

Jon William Teets

Suresh Gupta

An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, current data is sensed and is used for current limit and/or power balancing.

Method and apparatus for controlling output current of turbine/alternator on common shaft

An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs the AC output circuit, electrical power having a frequency unrelated to the rotation speed of the alternator.

Electrical system for turbine/alternator on common shaft

An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit and power line. During the power output mode the power line is monitored and the output voltage, frequency and/or phase is matched or synchronized to the power line.

Method and apparatus for controlling output voltages and frequencies of turbine/alternator on common shaft

An electrical system for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During start-up the frequency and voltage of the electrical power to the inverter is controlled as a function of the time and/or rotation speed.

Method and apparatus for turbine/alternator on common shaft during start-up

An electrical system and method for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. During the power out mode, output voltage is continuously measured and the inverter circuit is controlled to compensate for output voltage fluctuations.

Method and apparatus for compensating output voltage fluctuations of turbine/alternator on common shaft

An electrical system and apparatus for a turbine/alternator comprising a gas driven turbine and a permanent magnet alternator rotating on a common shaft includes an inverter circuit connectable either to an output circuit or the stator winding of the alternator. A control circuit during a start-up mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the output circuit. The operating parameters of the turbine are monitored during start-up and/or the power out mode.

Method and apparatus for monitoring turbine parameters of turbine/alternator on common shaft

An electrical system for a turbine/alternator comprising a gas driven turbine and permanent magnet alternator rotating on a common shaft comprises an inverter circuit connectable either to an AC output circuit or the stator winding of the alternator. A control circuit during a startup mode switches the inverter circuit to the stator winding of the alternator and during a power out mode switches the inverter circuit to the AC output circuit. Thus, during the startup mode, the alternator functions as a motor to raise the speed of the turbine to a safe ignition speed and in the power out mode the electrical system outputs to the AC output circuit, electrical power having a frequency unrelated to the rotational speed of the alternator.

A process is provided for forming a metallic edge having a three dimensional internal configuration by preparing a metallic edge blank having a two dimensional internal configuration; attaching a flange to the sides of the blank; preheating the blank, forming mandrel and receiver dies to a temperature at which the metal is in a malleable state, with the forming mandrel having an external surface which corresponds to the three dimensional internal configuration of the formed metallic edge; and hot forming the metallic edge by securing the blank within the receiver dies and advancing the mandrel into the inner cavity of the blank through use of a drive means which rotates the mandrel as it advances into the blank while maintaining the blank, mandrel and receiver dies at the malleable temperature.

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Stuart, FL, United States of America

Douglas R Burnham