Yoshihide Nii

Control methods for induction machine directly coupled to engine

Abstract For the purpose of low fuel consumption and low emissions, we have developed a hybrid powertrain system with an induction machine directly coupled to the engine, and power capacitors as a power source, which offers such functions as starting and assisting the engine, and regenerating braking energy. This paper describes three different motor control methods suitable for such a system. The first is a method without using a conventional high-resolution speed sensor, the second, a method for high accuracy of torque control by rotor resistance estimation, and the third, a method for high efficiency by controlling the flux according to changes in DC link voltage.