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R. Schuch:
"Inbetriebnahme und Optimierung der sensorlosen Regelung an industriellen PSM kleiner Leistung";
Supervisor: E. Robeischl, M. Schrödl; Elektrische Antriebe und Maschinen E372, 2001.

This diploma-thesis deals with the realization of sensorless control of industrial permanent magnet synchronous motors (PMSM) in the low power range for low velocities down to standstill. The term "sensorless" denotes, that there is no mechanical sensor for detection of the rotor position. The elimination of the mechanical sensor reduces the costs, and the drives are more robust.
The algorithms for the sensorless position detection and the field oriented control were implemented in a digital signal processor.
For the sensorless position detection at low velocities a method, which was developed at the institute of electrical drives and machines, was used. This so called INFORM-Method uses the different magnetic characteristics depending on the actual position of the rotor, which are caused by saturation and reluctance effects.
The evaluation of this effects is realized by specific switching of the voltage source inverter and specific measurement of the DC-link current.
Within this diploma-thesis this method was tested and improved in important points. After preparation of the necessary components (construction of an inverter, using a new digital signal processor system, putting into operation of a test stand for load tests) new measuring methods were developed. As a result qualitative and quantitative statements about how well machines are to operate by using the INFORM-Method are provided.
The influence of the stator current (fluxparallel (d-) and fluxnormal (q-) component) and the use of long motor link cables on the model were tested.
Due to specific tests and corresponding corrections requests of the industry were fulfilled as far as possible so that a lot of drive-applications can be implemented by using the INFORM-Method.