Efficient Determination of Modal Parameters of Electrical Machines

  Structure of the Measuring Chain Copyright: © IEM Structure of the Measuring Chain

Electric servo drives are often operated in close proximity to people. In terms of occupational health and safety, it is therefore of interest to design low noise level drives. Within the context of this project, an acoustic investigation is carried out on a servo drive. The goal of the investigation is the determination of valid modal parameters in the entire audible frequency range. Using a time-efficient measuring method, the gained knowledge can be used for acoustic optimization in early stages of the development process. Therefore, a new method for the optimal selection of measuring points is developed. Thereby the determination of modal parameters in the high frequency range (> 5kHz) is regarded. This method is based on a further development of the so-called "Optimal Driving Point Criterion".

Within the method, eigenvectors of the considered geometry from a yet unparameterized FE-model are used. Then a minimum set of measuring points is determined in an iterative process. The methodology is first analyzed by an experimental impact modal analysis.