Constant speed and frequency generating system

Details Constant speed and frequency generating system Constant speed and frequency generating system

1988-02-29

1989-02-21

Hickey, R. J.

Electricity: single generator systems

Automatic control of generator or driving means

Speed or frequency of generator

322 32, 322 39, 310 68D, H02P 930, H02P 942, H02K 710

Patent

active

048068411

ABSTRACT:
An output frequency control circuit is mounted on the rotating shaft connecting a motor and generator. The motor-generator system includes exciter circuits, an input power factor control and an output voltage regulator. The input power factor control ensures that the motor input power factor is unity, which is desirable for motor control. The frequency control circuit responds to variations in the AC power source frequency by generating low frequency excitation to boost or buck the operational speed of the machine, causing the generator output frequency to remain constant at a selected frequency output irrespective of input power source frequency variation. The output frequency may be selected over a given range from a control panel adjustment pot.
The major innovation is that the entire frequency control circuit is shaft-mounted and requires no slip-rings or magnetic transformers for signal transfer, thus reducing the possibilities of mechanical failure. A second innovation is that the motor input power factor is held at unity. A third innovation is that the system is enabled to ride through `brownouts` or short term input power failure.

REFERENCES:
patent: 2854617 (1958-09-01), Johnson
patent: 3164769 (1965-01-01), Anderson
patent: 4229689 (1980-10-01), Nickoladze
patent: 4625160 (1986-11-01), Hucker
patent: 4723106 (1988-02-01), Gibbs et al.

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