The most important advantage of an electrical coolant pump lays in the free selection of the rotational speed, within a demand controlled cooling of the engine will be realised. With increasing speed the pump will be more downsized. The same fact is valid for an electrical engine with the same performance. It is useful to increase the rotational speed so one can use the following space advantage. In this paper will presented various high speed concepts, which were drafted especially for the electrical engine drive train. The pump steps were evaluated concerning to all pump relevant criteria. Concerning to the comparability of this diversified concepts the contemplations were made on identical clearance and test conditions. In the result of the experimental investigations could obtained best efficiency under retention of the relative clearance to larger pumps. Likewise is the opportune safety of the used concept procedures, which are proven applicable at smallest pumps. Summarising the preference rotational speed section of the pump steps for the application in the car could named, which will meet best the requirements of the car cooling circuit. The main results are classical design methods as well as CFD can be successfully used also for these very small pumps which was often endoubted. For the smaller impeller clearances efficiencies up to 80 % could be achieved which is far above the figures of present standard designs of coolant pumps with 40 - 50 % as an average. On this large data base an evaluation was carried out in order to find the optimal rpm. Considering all criteria listed above, the max. rpm shall not exceed 12000 rpm by reason of NPSHR (need for high system pressure) and the shape of performance curve.
Miniaturized high speed motor coolant pumps
2010
6 Seiten, 17 Bilder, 6 Tabellen, 8 Quellen
Conference paper
English
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