Analysis of an induction machine using a rotor integrated converter with a floating capacitor

Abstract

A novel topology of induction machine with a rotor integrated converter with a floating capacitor is investigated in this paper. The stator windings of the induction machine are directly connected to the grid. While the rotor windings are connected to a converter with a floating capacitor. The steady state mathematical model is presented and used to predict the operating range of the induction machine. The result shows that the induction machine can operate in a wide torque and speed range instead of working on the original torque-speed curve. In addition, the relationship between capacitance and capacitor voltage is studied for the constant speed and variable load operation. It is shown that it is possible to choose a low volume and high capacitance capacitor since the average DClink voltage is quite low.Index Terms-Induction machine, unity power factor, rotor integrated converter, steady state model, operating range, floating capacitor.978-1-4799-8805-1/15/$31.00 c ⃝2015 IEEE