Frequency, voltage and waveshape converter for a three phase ind

Details Frequency, voltage and waveshape converter for a three phase ind Frequency, voltage and waveshape converter for a three phase ind

1993-01-22

1997-03-25

Wysocki, Anthony

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 700

Patent

active

056148020

ABSTRACT:
A frequency, voltage and waveshape converter is placed between the terminals of an ordinary single-phase power line and the power input terminals of a three-phase induction motor. The converter is operable to provide to the power input terminals of the induction motor a three-phase AC voltage of frequency, magnitude and/or waveshape controllably different from those of the power line voltage, thereby to permit effective control of motor speed and power factor. The frequency of the AC voltage is adjustable over the range of 12-120 Hz, with the effective magnitude of the AC voltage being automatically adjusted in proportion therewith, thereby providing for a very wide range of motor speed control without incurring reduced motor operating efficiency.

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Patel et al, "Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor Inverters: Part I-Harmonic Elemination", IEEE Transactions on Industry Applications, vol. IA-9, No. 3, May/Jun. 1973 pp. 310-317.

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