Traction Drive with PMSM: Frequency Characteristics Measurement
Abstract
This paper describes a new method formeasurement of frequency characteristics of ac traction
drives. It helps to find dangerous resonant frequencies of
the traction drive supplied from a dc electrification system
and it allows finding danger oscillations of the dc-link LC
filter. The presented method has verified a drive with a
surface mounted PMSM controlled by DTC. The results
prove that the drive amplifies LC filter oscillations under
constant taken power. We have proposed an improvement
of the drive control in order to protect the drive against this
phenomenon. The behaviour of the improved DTC has been
analyzed by experiments made on the laboratory model of
the traction drive of the rated power of 10 kW.
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