Verfahren zum Beeinflussen der Frequenz eines umrichtergespeisten Motors

摘要

A trip-resistant frequency control inverter which prevents an overcurrent and overvoltage by frequency control of a motor. Such arrangement provides for generating an accelerating or decelerating rate from the output from a fuzzy controller, which inputs the difference between limiting values and detected values and their changes. The arrangement also provides at the time of acceleration a control which automatically generates an accelerating rate which maintains the current in the vicinity of the limiting value, and a normal acceleration part which adjusts the set accelerating rate. The arrangement further provides at the time of deceleration a control which automatically generates a decelerating rate which maintains the current and voltage in the vicinity of their limiting values, and a normal deceleration part which adjusts the set decelerating rate. Further, the arrangement provides during a steady state operation a control which automatically determines the accelerating or decelerating rate which maintains the current in the vicinity of the limiting value, and wherein the two control parts for automatic and normal operation are selectable by an operator.