A study of end turn inductance calculation of BLDC motors
This paper presents the different calculating methods of stator end turn leakage inductance at brushless dc motors (BLDC) with different winding types. The calculations are carried both analytically and numerically. The results of the two dimensional (2D) calculations have been compared with the results of three dimensional (3D) ones for the same motor. Finite Element Method (FEM) is used for 2D and 3D numerical analysis.
Stator winding leakage inductances determination using finite elements method
This paper presents a new method to establish the leakage inductances of AC machine stator winding using a numerical analyzing program based on the finite elements method. The 3D numerical analysis is used to determine the end winding leakage inductance. In order to eliminate the magnetic flux present in the space normally occupied by the rotor, when the rotor is removed, the air from the rotor space is replaced with a very low relative magnetic permeability (10-6) material. The results obtained are compared to those obtained by another method of numerical analysis, and with those calculated analytically. For one of the models, the results are compared to the results obtained experimentally as well.
Correlations for mass transfer between fluidized spheres and a liquid
Abstract Data on mass transfer between the solid particles and the liquid in a fluidized bed have been analyzed. After a convenient selection, various correlations have been derived. They show that for a given fluidized system, the Sherwood number is independent on the Reynolds number.