One piece, extruded housing for a dynamoelectric machine

Abstract

A dynamoelectric machine (,) includes a stator (,), a rotor (,), a bearing (,) supporting the rotor (,) for rotation about an axis (,), and a housing (,). The housing (,) is manufactured by first forming a unitary metallic extrusion (,) including a radially innermost nominally cylindrical member (,), a radially outermost nominally cylindrical member (,), a central nominally cylindrical member (,) spaced radially between the innermost and outermost members (,), a set of spokes (,) connecting the innermost and central cylindrical members (,) together, a set of arcuate cooling passages (,), a set of spokes (,) connecting the central outermost cylindrical members (,) together, and a set of arcuate cooling passages (,). A set of fins (,) are also formed during the extrusion process extending radially from the central cylindrical member (,) into the cooling passages (,). The spokes (,), passages (,), fins (,), and cylindrical members (,) extend parallel to the axis (,) from a first end (,) of the extrusion (,) to a second end (,) of the extrusion (,), with the cylindrical members (,) preferably being at least nominally concentric on the axis (,). After the extrusion (,) is formed, sufficient lengths of the innermost cylindrical member (,) and the spokes (,) are machined away to create a cavity (,) in the central cylindrical member (,) for receiving the stator (,) and rotor (,).