Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1975-08-19
1977-08-23
Rubinson, Gene Z.
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
318230, 318231, H02P 540
Patent
active
040442853
ABSTRACT:
A new induction motor control method and system utilizes one more electric power inverters each supplying a separate induction motor with alternating current excitation power. The respective inverters preferably comprise auto-sequential commutated controlled current inverters. Direct current is supplied to each inverter in the system from a common direct current power supply preferably comprising a phase controlled rectifier circuit with individual current smoothing inductors connected in the direct current link to each power inverter for isolation purposes. A common operator controlled power level control module is provided for controlling the magnitude of the output current supplied from the common phase controlled rectifier to all of the inverters in parallel. Respective motor flux sensing means are provided for each induction motor for deriving individual feedback control signals representative of the flux developed by the respective induction motors. The flux feedback signal is summed with an input command value of a flux control signal in a suitable summing circuit, and the error signal is supplied through a suitable compensating circuit for regulating the flux level of the respective induction motors by individually controlling the frequency of the excitation current supplied to the stator windings of the motor by its associated inverter. In a preferred embodiment the actual electro-magnetic flux produced across the induction motor stator-rotor gap is sensed and fed back to the summing circuit for control purposes. This sensed actual value of motor flux signal also is utilized to derive an actual value of torque feedback control signal that is employed in controlling the magnitude of the direct current supplied by the common phase controlled rectifier to all of the inverters in parallel. It is also preferred to employ a phase lock-loop converter as the compensating circuit in the frequency control.
REFERENCES:
patent: 3500158 (1970-03-01), Landau et al.
patent: 3512067 (1970-05-01), Landau
patent: 3593083 (1971-07-01), Blaschke
patent: 3700986 (1972-10-01), Cushman et al.
patent: 3796935 (1974-03-01), Blaschke
patent: 3805135 (1974-04-01), Blaschke
patent: 3824437 (1974-07-01), Blaschke
D'Atre John Douglas
Plunkett Allan Barr
General Electric Company
Richardson, Jr. A. S.
Rubinson Gene Z.
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