This paper presents the development and experimental validation of an intensive cooling method for electric machines based on direct air jet impingement on the end windings. The goal was to create an effective alternative to traditional shaft-mounted fan cooling methods, inspired by spray cooling techniques. Three air distributor designs were tested, evaluating cooling performance through maximum winding temperature measurements and calculated heat transfer coefficients. Numerical CFD simulations supported experimental findings and guided design optimizations.

This paper presents analytical thermal models of 7 different rotors with permanent magnets, which are used as sub-models in universal thermal management software, which is currently being developed at our university. Whole software is created as script in MATLAB interface and is based on equivalent thermal network. For each of the rotor topology is created thermal circuit, which can accurately calculate temperature distribution, and fits into software algorithm. All analytical models are verified by numerical finite element analysis.

Thermal analysis is one of the key aspects of electrical machine design. This paper presents an analysis of lumped parameter thermal model (LPTM) of the electrical machine. The paper shows a comparison of the different sizes of thermal models. Different quantities of the thermal nodes in the LPTM are analyzed. The main advantage of research is the reduction of the number of thermal nodes in the thermal model which leads to reducing calculating matrices and also reducing computing time. Several modifications of the thermal networks are applied at the permanent magnet synchronous motor (PMSM) and that are experimentally validated, also finite element analyses are applied and compared.

Inductance variation with the load can have a significant effect on the operation and control of the machine and it should to be implemented in the analytic design of the machine. In this paper a magnetic equivalent circuit (MEC) method used for the analysis of the permanent magnet flux linkage and both direct- and quadrature-axis inductances of surface-mounted PMSM at different current conditions is presented. The nonlinear characteristic of iron parts is considered and different conditions are analyzed to evaluate the equivalent circuit parameters and the saturation level of stator parts. The MEC results are then implemented to the operation maps calculation.

This paper is focused on the modification and improvement of the passive cooling system of the high speed electrical machines body. In the paper are described, compared, and evaluated variants of cooling rib shapes. For each shape is created the fluid CFD model and used the model boundary condition for steady state and transient thermal model. The contribution of the paper is possibilities for relatively cheap modification of the shape of the machine housing to get better values of the continuously working temperature.