Current controller with defined dynamic behavior for an interior permanent magnet synchronous motor

Typically traction and electronic stability programs (ESP) as well as drive train oscillation damping applications in electrical vehicles are realized in a cascaded control structure with the current control as innermost loop. The current control dynamic, however, is usually varying due to nonlinear effects as controller output saturation and changing motor parameters. In this paper a current control scheme is presented that ensures a well defined dynamic behavior despite these nonlinear effects. As a consequence, the design of superimposed control loops is simplified due to the well known linear dynamics, which in turn can be beneficial with respect to the performance of the entire control loop.