An asynchronized converter-fed motor and its model

Abstract

Results of theoretical and experimental studies of an asynchronized converter-fed motor (ACFM) are presented. A proposed version of a converter-fed motor is designed on the basis of an asynchronous motor with a phase-wound rotor based on a voltage inverter with IGBT modules as power switches. A signal from the current sensor to the microintegrated control system further shifts the driving pulse toward an ordered constant angle. These modifications improve energy performance and increase the switching capacity of the inverter by adjusting the delay angle of the power modules. An ACFM model has been developed on the basis of presented equations. It is useful to obtain the ACFM’s stator and rotor transfer function and to determine the controlled variables and control and disturbance influences. The proposed mathematical model makes it possible to investigate transient processes in an electric machine during starting up to speed, as well as under changes in shaft load.