Dual output synchronous-induction starting/generating system
First Claim
1. An electric power starter generator system, comprising:
- a synchronous generator having a first rotor and a first polyphase stator output coupled to an ac bus;
an induction motor/generator having a second rotor and a second polyphase stator output;
a shaft coupled to said first rotor of said synchronous generator and to said second rotor of said induction motor/generator, said shaft being drivably coupled to an external prime mover, said shaft driving said synchronous generator and said induction motor/generator at a same speed thereby; and
a rectifier/inverter having ac terminals coupled to said second polyphase stator output and dc terminals coupled to a dc bus, said rectifier/inverter allowing bi-directional power flow therethrough.
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Accused Products
Abstract
An electric power starter generator system comprises a synchronous generator and an induction motor/generator mutually coupled to a shaft being driven to an external prime mover. The synchronous generator and the induction motor/generator are driven by the shaft at the same speed. The system includes a rectifier/inverter having ac terminals coupled to the output of the induction motor/generator, and dc terminals coupled to a dc bus. This rectifier/inverter allows bi-directional power flow to effectuate both power generation as well as electric start of the prime mover. The synchronous generator is excited by a commonly driven permanent magnet generator and a modulated exciter field control. The induction motor/generator is self-exciting through the rectifier/inverter once a voltage is established on the dc bus. The establishment of this voltage may be accomplished by a battery, or by connection of the synchronous generator'"'"'s output to the input of the rectifier/inverter through a poly-phase contactor. This contactor also allows cross connection of either machine to either distribution bus if one of the machines were to fail, or if the loading on that particular bus became excessive.
138 Citations
13 Claims
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1. An electric power starter generator system, comprising:
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a synchronous generator having a first rotor and a first polyphase stator output coupled to an ac bus; an induction motor/generator having a second rotor and a second polyphase stator output; a shaft coupled to said first rotor of said synchronous generator and to said second rotor of said induction motor/generator, said shaft being drivably coupled to an external prime mover, said shaft driving said synchronous generator and said induction motor/generator at a same speed thereby; and a rectifier/inverter having ac terminals coupled to said second polyphase stator output and dc terminals coupled to a dc bus, said rectifier/inverter allowing bi-directional power flow therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An aircraft electric power starting and generating system, comprising:
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an aircraft engine; a shaft divably coupled to said aircraft engine; a synchronous generator having a first rotor directly coupled to said shaft, and a first polyphase wound stator coupled to an ac distribution bus; an induction motor generator having a second rotor directly coupled to said shaft, and a second polyphase wound stator; a bi-directional ac/dc converter having a polyphase ac input coupled to said second polyphase wound stator, and a dc output coupled to a dc distribution bus; and wherein said bi-directional ac/dc converter draws power from the dc bus to excite said second stator to cause said second rotor to rotate said shaft to allow starting of said aircraft engine. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification