Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1978-10-02
1981-01-06
Rubinson, Gene Z.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318810, H02P 540
Patent
active
042439272
ABSTRACT:
An a-c induction motor powered from an adjustable frequency and adjustable magnitude power source is provided with a feedback control system whose gain is varied as a function of the magnitude of flux developed in the motor in order to normalize system response throughout the motor operating range. The control system is a two-loop system in which one loop adjusts excitation frequency and the other loop adjusts excitation magnitude with the excitation frequency loop being responsive to a torque command signal and a torque feedback signal to generate an error signal which is utilized to adjust the excitation frequency of the power source. System gain is varied by modifying the error signal as a function of the magnitude of flux developed in the motor. Preferably this modification is performed by dividing the error signal by a signal representative of the magnitude of motor flux.
REFERENCES:
patent: 3593083 (1971-07-01), Blaschke
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 4023083 (1977-05-01), Plunkett
patent: 4044285 (1977-08-01), Plunkett et al.
patent: 4088934 (1978-05-01), D'Atre
General Electric Company
Richardson, Jr. Albert S.
Rubinson Gene Z.
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