Abstract: An apparatus for mounting a plurality of rotary compressors with minimal mechanical tolerances, wherein each of the compressors imparts axial forces on the structures with which they are mounted. The mounting apparatus includes an articulated shaft that rotationally couples and axially decouples the impeller wheels of the rotary compressors. The articulated shaft interoperates with compressors configured in a back-to-back configuration and, in addition, may be coupled to a motor. The articulated shaft and the impeller wheels may be supported by air bearings. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

Abstract: A random-wound winding for an electrical machine including interconnected wire layers, wherein the interconnected wire layers include randomly wound wires and are configured upon placement in the electrical machine to have substantially the same impedance. Accordingly, the random wound windings can include a first coil having layers of wires randomly wound on the first coil with the layers configured in a first layering order, a second coil having layers of wires randomly wound on the second coil with the layers configured in a second layering order transposed relative to the first layering order, and at least one electrical interconnection configured to serially connect the layers of the first coil to the layers of the second coil such that an average axial position of all interconnected layers is substantially the same.

Abstract: A rotating impeller disc of a rotating compressor is utilized as a thrust bearing (air film type) by clamping a compliant foil member on each side of the rotating impeller disc to cause the foil members to rotate with the impeller disc and relative to fixed bearing surfaces on each side of the rotating impeller disc. The fixed bearing surfaces and compressor housing sections enclose the impeller/foil assembly within a compression chamber. The rotating impeller/foil assembly drags along a layer of fluid on each side of the impeller/foil assembly and is caused to be centered within the compression chamber due to the equalized fluid film pressure build up on either side of the impeller/foil assembly with no external axially alignment device required. The impeller/foil assembly is integrated as a component of the motor shaft of the motor driving the compressor.