| CPC F04D 29/263 (2013.01) [F04D 29/626 (2013.01); F05B 2230/21 (2013.01); F05B 2230/239 (2013.01); F05B 2230/61 (2013.01)] | 7 Claims | 

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               1. A system, comprising: 
            a back face of an impeller wheel, opposite an exducer side, comprising a plurality of recesses interlocked with a plurality of bosses on a first face of a holding plate, wherein each recess is shaped via interconnected edges of adjacent blades of the impeller wheel, and wherein each boss of the plurality of bosses is positioned between adjacent blades of the impeller wheel. 
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