DC bus voltage controlling method for AC motor, involves forcing slope of internal ramp to zero value when bus voltage value is higher than limiting value, and increasing slope value when voltage value is lower than limiting value

摘要

The method involves comparing a voltage value measured on a DC bus with a determined limiting value by a comparator (10). Slope of an internal ramp (R) is forced to zero value when the voltage value is higher than the limiting value, in order to confer a constant frequency to a stator of an AC motor. The slope value is progressively increased when the voltage value is lower than the limiting value. An independent claim is also included for a system of controlling voltage on a DC bus of a speed controller for an AC motor connected to a current distribution network.