Parameterization of the Fan Assembly of the External Electric Motor Cooling System

Abstract

Relevance One of the most important issues in the design of electric machines is the implementation of a cooling system that provides efficient heat removal at low weight and size costs. Maintaining the optimal operating temperature of the active parts of an electric machine is necessary for its efficient and reliable operation, but under conditions of limited weight and size costs, this becomes a difficult engineering task. Air cooling of electric machines still does not lose its relevance due to its simplicity, small weight and size indicators and implementation costs. A key element in air cooling systems is the centrifugal fan, which creates the movement of air masses. Thus, in an air cooling system, the main task is to design a fan that provides the necessary characteristics. Aim of research Aim of the research is to design a fan with backward curved blades based on model parameterization in order to obtain the required performance while maintaining the overall parameters. The required volumetric performance is estimated at 120–200 m3/h depending on the rotational speed. Research methods The study is carried out using three-dimensional numerical computer simulation in the ANSYS CFX software package for computational fluid dynamics. The angles of entry and exit of the air flow from the impeller vary. As a result, 16 different variants of the ratios of the inlet and outlet flow angles were considered. Results As a result of the work, the design of the impeller of the air cooling system of the electric machine was parametrized. As a result of a series of calculations, it was determined that at an angle β2 = 70° for all angles β1 the required performance is provided at 6000 rpm. The most productive solution is the ratio β1 = 30° and β2 = 70°.