Johann Zitzelsberger

• Westsächsische Hochschule Zwickau

Das EMA-LAB als Forschungslabor und hybride Lernwerkstatt greift die zentralen Aspekte der Hochschulentwicklungsplanung auf und fokussiert auf eine bessere Ausnutzung des Potenzials des praxisnahen Studiums an der WHZ. Durch die Schaffung optimaler Studienbedingungen bestehen ein leistungsförderndes Studienklima und beste Voraussetzungen für den in...

The topic of sustainability is on everyone's lips today. An enormous complexity comes to light, so that singular approaches are increasingly doomed to failure right from the beginning. So how shall we deal with the constantly increasing complexity? This article takes up this question in such a way that the realization of true sustainability is trig...

To cope with new phenomena in drive applications, e.g. bearing currents, new space vector based modulation principles have been proposed over the last few years. Most of them operate with three space vectors, which are placed sequentially within the pulse period. The resulting pulse pattern is characterised by two or more switching operations, occu...

The common mode voltages produced by fast switching IGBT-PWM inverters are often the reason for bearing damages. These are caused by the current flow through the bearing after breakdown of the bearing lubricating film. The decisive current parts in the medium power range are the electric discharge machining current and the dv/dt-current. They are d...

An increasing demand on the quality of wind power systems affects also more and more the fields of lifetime and reliability. But, problems like bearing damages because of bearing currents counteract these desired demands. Especially doubly fed induction generators, which are wide spread in use for wind turbines up to the MW-class can be limited in...

Newest investigations have shown that bearing currents can be lowered by using modified pulse pattern generation methods. One suggestion for such a solution is the principle of sequentially positioned pulses. Hereby, a modified space vector modulation is used, in order to reduce both the amplitude of and the number of potential alterations in the c...

The phenomenon of bearing currents is known for a long period. Especially those which are caused by magnetic asymmetries have been investigated since the beginning of the 20 th century. Nowadays new kinds of bearing currents can be observed in inverter fed induction drives. Investigations done on these effects show that the switched operational mod...