Abstract
Electrical drives - controlled in torque, speed and position - had been dc- drives in the past. These drives have three major components: the electrical machine, the power converter and the signal processing for the control.In all three areas occured major changes, thus meanwhile a variety of solutions are available even for low power drives at a reasonable cost level.Nowadays ac-machines tend to replace dc-machines. This trend is supported by a dramatic development of new power semiconductors which can be switched off, too. Moreover new techniques are available to simplify the mechanical construction of the converters, thus reducing space and weight. Furthermore new converter topologies are in discussion, enabling higher switching frequencies and reducing the harmonics.The signal processing has shifted from analogue to digital, given rise to the implementation of more complex control strategies on the one hand, but decoupling hard- and software production on the other hand.These trends will be described in detail in this paper.
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