Electricity: single generator systems – With physical starting and/or stopping of the generator
Patent
1994-11-15
1996-02-20
Dougherty, Thomas M.
Electricity: single generator systems
With physical starting and/or stopping of the generator
322 44, F02N 1100
Patent
active
054932017
ABSTRACT:
An electric power starter/generator system for a turbine engine capable of transforming mechanical power from the turbine engine to electric power during a generate mode of operation and of transforming electric power from a low voltage dc source to mechanical power to drive the turbine engine during a start mode of operation, comprises a synchronous starter/generator having a poly-phase wound stator, and a rotor rotatably positioned therein, the rotor also being drivably coupled to the turbine engine. Further, the system establishes an electric field in the rotor and directly couples the dc source to an inverter for alternately energizing each of the poly-phase stator windings to drive the starter/generator as a motor. This inverter establishes a rotating electric field in the stator whereby a constant torque is produced by the rotor to drive the turbine engine. Preferably, the inverter is a half wave inverter producing a pseudo-square wave current waveform. Alternatively, the inverter is a full wave inverter and the starter/generator neutral is disconnected during the start mode of operation. The method of driving the starter/generator as a motor comprises the steps of establishing field excitation, producing a poly-phase periodic half wave sinusoidal motor drive signal, scaling the motor drive signal by a scale factor, varying the scale factor during each period of the motor drive signal to produce a pseudo-square wave current waveform, and coupling the pseudo-square wave current waveform to the wound stator to drive the rotor to produce a constant torque.
REFERENCES:
patent: 3652920 (1972-03-01), South et al.
patent: 4743777 (1988-05-01), Shilling et al.
patent: 5036267 (1991-07-01), Markunas et al.
patent: 5055764 (1991-10-01), Rozman et al.
patent: 5065086 (1991-11-01), Takakado
patent: 5281905 (1994-01-01), Dhyanchand et al.
patent: 5283471 (1994-02-01), Raad
Dougherty Thomas M.
Makeever Jeffery J.
Ponomarenko Nicholas
Sundstrand Corporation
LandOfFree
Starter/generator system and method utilizing a low voltage sour does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Starter/generator system and method utilizing a low voltage sour, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Starter/generator system and method utilizing a low voltage sour will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1358157