The project is concerned with non-convectional direct stator winding slot cooling using water. The aim is to find optimal algorithm for control of water cooling. The control algorithms are tested on the experimental device, which is part of real synchronous machine with permanent magnets. The thermal model was built as a base for computational model of a machine without thermal sensors. The thermal model is possible used as predictor of machine heating in real time. This type of water cooling shows better effect on the machine heating than common water cooling system on the cover. and Obsahuje seznam literatury
The paper is concerned with computational simulation of stator winding heating of the synchronous machine. Software ANSYS 8.0 was used for computational simulation. Computational model considers heat pipe in the middle of winding slot. The results of computer simulation show the effect of direct winding cooling with water. The results of both methods of cooling were compared. Experimental device was created for verification of computational simulations. and Obsahuje seznam literatury
This paper is concerned with unconventional water cooling that is primarily intended for medium-power synchronous generators. A configuration of the proposed cooling was briefly described here. A way how to estimate the main thermal resistance related to the new water cooling system was presented here. A small induction motor was selected for practical verification of the proposed cooling concept. Measurements extended on this motor showed correctness of water cooling parameters design and superiority of this cooling method comparing to another traditional methods of cooling. and Obsahuje seznam literatury
The aim of this paper is to show the complex thermal analyses used to design of aircraft electronic control unit. Control Power Supply for Jet (CPSJ). The goal is to examine thermal conditions of power and control electronics components. With respect to aircraft application a computational fluid dynamics (CFD) method is used for heat transfer coefficient determination. This method is compared to analytic solution based on Petuchov equation of Nusselt number. The temperature conditions inside the CPSI unit are presented as results. and Obsahuje seznam literatury