BEHAVIOR OF CAPACITOR-RUN SINGLE - PUASE INDUCTION MOTORS DRIVEN FROM A VARIABLE FREQUENCY SUPPLY

Document Type : Original Article

Author

Department of electrical engineering, Faculty of Engineering, El-Monoufya university, Shebin El-Kom egypt

Abstract

The capacitor - run single-phase induction motor is
preferred than the other types of single-phase induction motors,
due to lower current , higher eficiency and power factor. Speed
control of these motors can be achieved through a wide range by
the variable frequency controller Frequency variation needs a
voltage variation by the same ratio (V/F = constant) during the
constant torque region. If the capacitor is kept constant, the
maximun torque will be decreased by the frequency decreasing.
The main object of this work is to keep the maximun torque and
thus full load torque, at higher values through the
decreasing. The capacitance value should be increased, by
frequency decreasing, to a value which keeps the winding Cuirunt
at its rated value and the motor performance analysis is also
achieved
The computed and the measured performance characteristics are
compared and found to be in a good agreement

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