A Study of the Fluid Flow in the Stator of an Electrical Machine

Abstract

This paper describes an experimental study of the air flow behaviour in the ventilating ducts in the stators of electric motors and/or generators of a conventional design. The objective of the research was to facilitate the prediction of the local heat transfer coefficients in the ventilating ducts. Various flow phenomena were observed and compared with theoretical predictions. Although the theory usually used for similar cases was found to be inapplicable, a related theory was found that checked well with experimental results. A stall phenomenon was observed under certain identified conditions. Useful relationships for predicting the flow details were obtained, and suggestions for future improvement in duct designs are proposed. </jats:p