A CONTRIBUTION TO DETERMINE NATURAL FREQUENCIES OF ELECTRICAL MACHINES. INFLUENCE OF STATOR FOOT FIXATION

摘要

In this paper, four methods to determine the mechanical characteristics (natural frequencies, mode numbers) of electrical machine stators are developed. Result comparison concerns analytical laws, a finite element software, a modal experimental procedure and a method based on analogies between mechanic and electric domains. Simple structures are studied in order to analyze the validity of each method with accuracy. The fixation of a stator yoke allows to observe the modifications of the mechanical behavior.