Electrical Drive Systems

Electrical Drive Systems

Lecture + Exercise + Laboratory

  • Performance of induction machines considering the stator winding resistance.
  • Special considerations for start-up and acceleration of induction and synchronous motors: inrush characteristics, current and torque peaks, temperature rise during start-up and torque-speed characteristics.
  • Electric braking methods for induction machines: reverse field braking, DC braking, regenerative braking.
  • Speed control in induction and synchronous machines: description and comparison of different types of drive systems with regard to additional losses, generation of pulsation torques and cost.
  • Temperature rise and cooling: cooling methods, operating modes, demands on energy efficiency, determination of steady-state and transient temperature rise in the windings.
  • Introduction into the calculation scheme of symmetrical components for instantaneous values and the Park transformation (voltage equations, instantaneous value of electromagnetic torque) for simulation of transient phenomena.Simulation of mechanical shafting, influence of mechanical damping, modeling of transient current displacement in the rotor cage; discussion of the most important transient phenomena in induction and synchronous machines (starting, symmetrical and unsymmetrical short circuits, voltage recovery, transfer of bus-bar or incorrect synchronization); reactances and time constants of synchronous machines.
  • Details of mechanical design: types of construction and cooling methods, explosion-proof machines, mutual effects of different coupling and bearing assemblies; generation and avoidance of shaft voltages and bearing currents.
  • Investigation and evaluation of acoustic noise emissions.


Prof. Dr.-Ing. Bernd Ponick