Based on analysing the factors that cause torque ripple and the nonzero demagnetism/inmagnetism component in stator current for the typical direct torque control system of the permanent magnet syn- chronous motor, a novel control system which directly controls the magnetizing component of the stator cur- rent with two-level bang-bang controller was presented. The improvement eliminated the component which in the stator current did not hope, enhanced the exchange transmission system efficiency. It is simple and easy to implement. The simulation results indicate the static and dynamic performanc...
