Flux control for induction motor drive using load commutated inv

Details Flux control for induction motor drive using load commutated inv Flux control for induction motor drive using load commutated inv

1985-02-26

1986-08-19

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, 318814, 323207, H02P 540, H02J 318

Patent

active

046072063

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 amperes (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:
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patent: 3851234 (1974-11-01), Hoffman et al.
patent: 3959719 (1976-05-01), Espelage
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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.

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