H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 21/10 (2006.01)
Patent
CA 1073523
20-TT-611 ABSTRACT A new induction motor control method and system utilizes one or more electric power inverters each supplying a separate induction motor with alternating current excitation power. The respective inverters pre- ferably 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 rec- tifier circuit with individual current smoothing inductors connected in the direct current link to each power inverter for isolation purposes. A com- mon operator controlled power level control module is provided for con- trolling 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 de- riving individual feedback control signals representative of the flux de- veloped 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 com- pensating 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. 20-TT-611 It is also preferred to employ a phase lock-loop converter as the compensating circuit in the frequency control.
259478
D'atre John D.
Plunkett Allan B.
Company General Electric
Na
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