Electricity: motive power systems – Induction motor systems – With voltage source connected to motor secondary
Patent
1987-04-06
1989-03-14
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
With voltage source connected to motor secondary
318705, 318827, H02P 540
Patent
active
048127302
ABSTRACT:
A generator/motor system comprises a generator/motor having a primary winding and a secondary winding installed on the motor rotor coupled to a prime mover/load, a main circuit interposed between a power system and the primary winding of the generator/motor, an excitation circuit including a frequency converter inserted between a part of the main circuit and the secondary winding of the generator/motor, a frequency difference detector for determining the difference between the frequency of the power system and a frequency dependent on the rotational speed of the load, and a phase-shift control device for controlling the firing phase of the frequency converter in the excitation circuit by use of a signal from the frequency difference detector as a reference signal. In normal operation, a frequency signal following the frequency of the power system is produced, while at the time of a disturbance of the power system, the same frequency signal of the power system as before the disturbance continues to be produced thereby to keep the system in stable operation. For this purpose, a starting electric machine, a synchronous motor and a synchronous generator are aligned, and an output of the synchronous generator is applied to the frequency difference detector.
REFERENCES:
patent: 1796220 (1931-03-01), Seeley
patent: 2255923 (1941-09-01), Griscom
patent: 3667012 (1972-05-01), Kilgore
patent: 3829757 (1974-08-01), Frank et al.
patent: 4321478 (1982-03-01), Plunkett et al.
patent: 4481455 (1984-11-01), Sugimoto et al.
patent: 4663536 (1987-05-01), Roesel, Jr. et al.
Furukawa Yosio
Kato Tadaatsu
Kayukawa Shigehiro
Nagura Osamu
Nakagawa Hiroto
Hitachi , Ltd.
Kansai Electric Power Co., Inc.
Smith Jr. David
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