Electricity: single generator systems – Automatic control of generator or driving means – Speed or frequency of generator
Patent
1984-12-17
1986-11-25
Perkey, William B.
Electricity: single generator systems
Automatic control of generator or driving means
Speed or frequency of generator
310 83, 310115, 310118, 310125, 310154, 310197, H02P 930, H02K 710, H02K 2360, H02K 1910
Patent
active
046251600
ABSTRACT:
A variable speed constant frequency generating system for generating constant frequency electrical output power from a variable speed source of motive power includes an exciter for generating excitation current, a main generator for developing the output power, both of the exciter and main generator being driven by a shaft coupled to the motive power source and power converters mounted on the shaft to transfer power between the exciter and the main generator. At shaft speeds below synchronous speed, i.e. that speed which would produce the desired output frequency when DC power is coupled to the main generator field windings, the exciter output is rectified and inverted so that alternating current power of proper frequency is delivered to the field windings of the main generator to maintain the output of the generator at a constant frequency. At synchronous speed, the power converters transfer substantially only DC power to the main generator windings. At speeds above synchronous speed, power is returned back to the exciter to cause same to operate as a motor and apply negative torque to the shaft and thereby maintain the output power at the desired frequency.
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Standard Handbook for Electrical Engineers, 11th Edition, pp. 7-2, 7-24, 7-25 and 20-13.
Perkey William B.
Sundstrand Corporation
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