초록 ▼

The invention is an aircraft power generation system which utilizes an induction-machine (G1) as a primary generator of variable-voltage/variable-frequency power. The induction-machine (G1) is directly driven by the engine (14) and is excited by an excitation-generator (G2) such that the induction-m

The invention is an aircraft power generation system which utilizes an induction-machine (G1) as a primary generator of variable-voltage/variable-frequency power. The induction-machine (G1) is directly driven by the engine (14) and is excited by an excitation-generator (G2) such that the induction-machine (G1) operates in a generating mode. A variable-speed drive (20), shown as a toroidal drive (30), controls the excitation frequency of the induction-machine (G1) such that the negative slip-frequency is controlled as a function of the input speeds (N1), (N2) and the electric load on the generator. Control of the toroidal drive (30) and thus speed (N2) is accomplished by a negative-slip control circuit which includes a drive control logic circuit (36), a proportional actuator (34), a control-start panel (48), and a steering mechanism (32). In another aspect of the invention, the induction-machine (G1) operates in a start-mode to start the engine (14). In this mode of operation, after engine starting is initiated from control-start panel (48), a start-logic circuit (52) establishes a programmed voltage/frequency output from a start-power electronics source (46). The voltage/frequency output, programmed from a low value, against time, up to a predetermined high value is applied to the induction-machine (G1) field to bring the engine (14) up to speed.

대표청구항 ▼

A power generating system comprising: an induction machine including an induction rotor and a stator; mechanical drive means connected to said induction motor for driving said induction machine at a variable speed; a synchronous excitation generator coupled mechanically with said induction machine b

A power generating system comprising: an induction machine including an induction rotor and a stator; mechanical drive means connected to said induction motor for driving said induction machine at a variable speed; a synchronous excitation generator coupled mechanically with said induction machine by means of a variable-speed drive, whereby said synchronous excitation generator will provide a variable output voltage and frequency; means for applying said variable output voltage and frequency to said stator of said induction machine; and drive-logic control means for monitoring the speed and load data of said induction machine and for adjusting and maintaining the speed of said synchronous excitation generator so as to control the negative slip-frequency of said induction machine whereby said induction machine may operate in a generating mode with its output controlled in response to said speed and load data.