Starter/generator system having multivoltage generation capability
First Claim
1. An electric power starter/generator for converting electrical energy from a remote dc electrical power source to mechanical energy to start a turbine engine in the start mode, and for converting mechanical energy from the turbine engine to electrical energy to power utilization equipment in the generate mode, comprising:
- a mechanical energy coupling means for transferring rotational mechanical energy between said electric power starter/generator and the turbine engine;
a permanent magnet synchronous machine having a rotor driveably coupled to said mechanical energy coupling means and a stator; and
a bidirectional ac-dc power converter having a dc input/output and an ac input/output, said dc input/output coupled to the remote dc source, said ac input/output coupled to said stator of said permanent magnet synchronous machine, said power converter producing variable frequency polyphase ac excitation at said ac input/output from the dc electrical energy at said dc input/output to drive said permanent magnet synchronous machine as a brushless dc motor to generate rotational mechanical energy to start the turbine engine via said mechanical energy coupling means during the start mode, said power converter alternately producing dc electrical energy at said dc input/output from polyphase ac electrical energy at said ac input/output generated by said permanent magnet synchronous machine when driven by the turbine engine via said mechanical energy coupling means during the generate mode.
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Accused Products
Abstract
An electric power starter/generator, for converting electrical energy from a remote dc electrical power source to mechanical energy to start a turbine engine in the start mode, and for converting mechanical energy from the turbine engine to electrical energy to power utilization equipment in the generate mode, comprises a shaft for transferring rotational mechanical energy between the electric power starter/generator and the turbine engine, a permanent magnet synchronous machine having a rotor driveably coupled to the shaft and a stator. The permanent magnet synchronous machine produces polyphase ac electric power when driven as a generator, and rotational mechanical energy when driven as a motor. A bidirectional ac-dc power converter having a dc and an ac input/output produces variable frequency polyphase ac excitation from the dc electrical energy at the dc input/output to drive the permanent magnet synchronous machine as a brushless dc motor to generate rotational mechanical energy to start the turbine engine during the start mode. The power converter alternately produces dc electrical energy from the polyphase ac electrical energy generated by the permanent magnet synchronous machine when driven by the turbine engine during the generate mode.
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Citations
29 Claims
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1. An electric power starter/generator for converting electrical energy from a remote dc electrical power source to mechanical energy to start a turbine engine in the start mode, and for converting mechanical energy from the turbine engine to electrical energy to power utilization equipment in the generate mode, comprising:
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a mechanical energy coupling means for transferring rotational mechanical energy between said electric power starter/generator and the turbine engine; a permanent magnet synchronous machine having a rotor driveably coupled to said mechanical energy coupling means and a stator; and a bidirectional ac-dc power converter having a dc input/output and an ac input/output, said dc input/output coupled to the remote dc source, said ac input/output coupled to said stator of said permanent magnet synchronous machine, said power converter producing variable frequency polyphase ac excitation at said ac input/output from the dc electrical energy at said dc input/output to drive said permanent magnet synchronous machine as a brushless dc motor to generate rotational mechanical energy to start the turbine engine via said mechanical energy coupling means during the start mode, said power converter alternately producing dc electrical energy at said dc input/output from polyphase ac electrical energy at said ac input/output generated by said permanent magnet synchronous machine when driven by the turbine engine via said mechanical energy coupling means during the generate mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electric power starter/generator for converting electrical energy from a 28 volts dc aircraft battery to mechanical energy to start an turbine engine in the start mode, and for converting mechanical energy from the turbine engine to electrical energy to power utilization equipment in the generate mode, comprising:
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a shaft for transferring rotational mechanical energy between said electric power starter/generator and the turbine engine; a low voltage/high current permanent magnet synchronous machine having a rotor driveably coupled to said shaft and a stator; and a bidirectional six-pulse ac-dc power converter having a dc input/output and an ac input/output, said dc input/output coupled to the 28 volts dc battery, said ac input/output coupled to said stator of said permanent magnet synchronous machine, said power converter producing variable frequency three-phase ac excitation at said ac input/output from the 28 volts dc electrical energy at said dc input/output to drive said permanent magnet synchronous machine as a three-phase brushless dc motor to generate rotational mechanical energy to start the turbine engine via said shaft during the start mode, said power converter alternately producing 28 volts dc electrical energy at said dc input/output from three-phase ac electrical energy at said ac input/output generated by said permanent magnet synchronous machine when driven by the turbine engine via said shaft during the generate mode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification