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.
Finding end winding inductances of MVA machines
Correct FEM computations of end windings leakage inductances of MVA-range machines are discussed. This is shown through validations against total stator reactance measurements of 11 air-suspended stators and a reasonable agreement of FEM computations with the IEC 60034-4 standard. To achieve this goal the need to have several 2D- and 3D-FEM models including those representing the cooling ducts is emphasized. Steps to utilize the validated stator FEM models for direct computation of end windings leakage inductances are also listed. It is also shown that measurements of zero-sequence reactances can not help the FEM validations and do not provide a reliable estimation of leakage inductances.
Rotating dialysis cell as in vitro release method for oily parenteral depot solutions.
The purpose of the study was to investigate an in vitro release method based on a rotating dialysis cell for parenteral oil depot formulations using different model conditions and test formulations. The total amount of drug released from the rotating dialysis cell was in accordance with the theoretical values calculated from the partition coefficients. The release rates were shown to depend on the total amount of drug available for the release process and to follow first order kinetics. The rotating dialysis cell has a potential as in vitro release method for characterization of oily depot formulations for parenteral administration.