| Abstract |
Torsional oscillations are a phenomenon that can be observed within every rotating mechanical system, also in traction applications. Due to the low damping of steel the oscillations abate slowly. Moreover, it is usually difficult to increase the damping coefficients mechanically. Hence, the concept of active damping through modifying the electrical drive control becomes attractive. To develop a sufficient damping controller, an analysis of the mechanical oscillating system is important to localize the stiffness elements with highest potential energy at each system eigenfrequency. Increasing the damping coefficient of the element with greatest influence on the dominant eigenfrequency therefore has the highest impact on the damping of this frequency. Therefore, a control algorithm based on an added physical damping term is suggested. To obtain the state variables, that are required for the control but which cannot be measured, the design of an appropriate observer is discussed. The result is a robust and stable active damping control for purely current controlled electrical traction drives. |
