Adjustable frequency AC motor drive using an unrestricted freque

Details Adjustable frequency AC motor drive using an unrestricted freque Adjustable frequency AC motor drive using an unrestricted freque

1983-11-03

1985-08-27

Beha, Jr., William H.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

363 10, 363164, H02M 527

Patent

active

045382204

ABSTRACT:
In an unrestricted frequency changer (UFC) the control pulses are generated by the intersection of a reference ramp of controllable slope and frequency with a succession of timing ramps characterizing the succession of phase voltages at the input of the UFC, whereby by increasing the slope and exceeding the peaks of the timing waves the sinusoidal shape of the output becomes trapezoidal and by increased slope increasingly close to a square-shaped wave, thus maximizing the output voltage at high frequency of operation.

REFERENCES:
patent: 3470447 (1969-09-01), Gyugyi et al.
patent: 3493838 (1970-02-01), Gyugyi et al.

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