Verfahren zur Reduzierung von Rückwirkungen auf den Verlauf des einem Netz entnommenen Stroms bei induktiven Lasten und Vorrichtung zum Antreiben von Motoren nach diesem Verfahren

摘要

The method involves using active filtering of the harmonics through a boost-converter. An inductive load is used as at least a part replacement of an inductance needed for the boost-converter. The load is a motor which is driven through a switching bridge. At least one motor winding is used as the inductance for the boost-converter. The function of the boost-converter is integrated in the switching bridge driving the motor and in the motor, whereby a motor winding is used as an inductance for the boost-converter. The motor winding magnetises in a first phase with a voltage of a condenser (5), in a second phase through an electronic switch for power factor correction and in a third phase the motor winding is demagnetised.