Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-02-26
1986-07-22
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 318814, 323207, H02P 540, H02J 318
Patent
active
046021990
ABSTRACT:
A system for controlling the operation of an alternating current induction motor having windings supplied by electrical power from the polyphase alternating current source includes a load commutated inverter circuit which is connected between the power source and the induction motor for furnishing electrical power to the motor. Controllers responsive to a command signal and a feedback signal indicative of motor operating parameters control the operation of said load commutated inverter circuit. There is further provided a fixed capacitor circuit connected between the windings of the motor for supplying reactive volt ampheres (VARs) to said load commutated inverter circuit and said motor. Finally, there is provided a variable VAR generator connected between the motor windings for supplying VARs to said load commutated inverter circuit and said motor in response to the output of a third feedback control path which is also responsive to a command signal and prescribed operating parameter(s) of said load and/or said commutated inverter.
REFERENCES:
patent: 3207974 (1965-09-01), McMurray
patent: 3555396 (1971-01-01), Kalman
patent: 3909687 (1975-09-01), Abbondanti
patent: 3959719 (1976-05-01), Espelage
patent: 4039926 (1977-08-01), Steigerwald
patent: 4431957 (1984-02-01), Chausse et al.
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patent: 4454470 (1984-06-01), Boettner et al.
patent: 4496899 (1985-01-01), Lippitt et al.
Iwasaki et al., "Current-Fed Inverter with Status Var Generator for Induction Motor Drive", Electrical Engineering in Japan,-vol. 103, No. 3, 1983.
General Electric Company
Renner Arnold E.
Smith Jr. David
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