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Electronically Switched Capacitor-fed Three-phase Induction Motor Operating from Single-phase Supply

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The transient behavior of a three-phase induction motor operating with a single-phase supply using a switching capacitor as a phase converter is considered in this article. An electronically controlled capacitor, which employs one fixed capacitor with an electronic switch, is used to improve the performance of the three-phase induction motor operating from a single-phase supply. Variable capacitor values are obtained by controlling the duty cycle of the electronic switch. Instantaneous symmetrical components are used in modeling the motor, including the switching capacitor. Theoretical studies have been carried out for the system considered, and the results are presented and discussed. The results presented include transient speed, current, and torque patterns under starting and running conditions. The validation of the developed mathematical model by computer simulation and experimental results in comparison with conventional operation using one or two fixed capacitor values prove the accuracy and the strength in the proposed method.
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Keywords: duty cycle control; minimum unbalance; phase capacitor; switching capacitor; three-phase induction motor

Document Type: Research Article

Affiliations: Electrical Engineering Department, College of Technological Studies, Shwaikh, Kuwait

Publication date: 2009-06-01

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