Electricity: single generator systems – With physical starting and/or stopping of the generator
Patent
1989-01-01
1990-08-14
Hickey, R. J.
Electricity: single generator systems
With physical starting and/or stopping of the generator
290 38R, 290 46, 322 29, F02N 1104, F02N 1108
Patent
active
049482092
ABSTRACT:
A variable speed, constant frequency starter generator system is provided with a dynamoelectric machine, electrically connected to a multiple-phase bus and pair of multiple-phase rectifiers for producing a DC voltage on a pair of link conductors. An inverter converts the DC voltage to floating AC voltage which is further converted to a ground-referenced AC voltage by a transformer. During generator operation, the output voltage of the machine is rectified by at least one of the rectifiers to produce a DC voltage on the link conductors which is converted to a constant frequency AC voltage by the inverter. During starter operation, an externally supplied AC voltage is applied to the transformer. The transformer converts the externally applied AC voltage to a pair of phase-displaced AC voltages which are rectified by the pair of multiple phase rectifiers to produce twelve-pulse rectified DC voltage on the link conductors. This reduces the harmonic content of the current supplied by the external power source. In another embodiment, a third multiple phase rectifier performs the function of rectifying the output voltage of the machine to produce a six pulse DC voltage on the link conductors for generator operation.
REFERENCES:
patent: 3191116 (1965-06-01), Depenbrock
patent: 4119861 (1978-10-01), Gocho
patent: 4481459 (1984-11-01), Mehl et al.
patent: 4574340 (1986-03-01), Baker
patent: 4728806 (1988-03-01), Baker et al.
patent: 4808842 (1989-02-01), Hughes
patent: 4841216 (1989-06-01), Okada et al.
Baker Donal E.
Ogden Jack W.
Hickey R. J.
Lenart R. P.
Westinghouse Electric Corp.
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