One piece, extruded housing for a dynamoelectric machine

A method of manufacturing a housing for a dynamoelectric machine including a stator, a rotor, and at least one bearing for rotatably support the rotor, the method comprising the steps of:

• forming a unitary metallic extrusion including three nominally concentric nominally cylindrical members connected to each other by spokes, the spokes and the cylindrical members extending from a first end of the extrusion to a second end of the extrusion and defining a first set of arcuate cooling passages between a radially innermost one of the cylindrical members and a radially central one of the cylindrical members, and a second set of arcuate cooling passages between a radially outermost one of the cylindrical members and the radially central one of the cylindrical members;
• and
• machining away sufficient lengths of the radially innermost one of the cylindrical members and its associated spokes to create a cavity in the radially central one of the cylindrical members for receiving the stator and the rotor of the dynamoelectric machine and retaining a sufficient length of the radially innermost one of the cylindrical members to receive the at least one bearing.

A method of manufacturing a housing for a dynamoelectric machine including a stator, a rotor, and at least one bearing for rotatably supporting the rotor, the method comprising the steps of:

• 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 first set of spokes connecting the innermost and central cylindrical members together, a first set of arcuate cooling passages defined between the first set of spokes and the innermost and central cylindrical members, a second set of spokes connecting the outermost and central cylindrical members together, and a second set of arcuate cooling passages defined between the second set of spokes and the outermost and central cylindrical members, the spokes, passages, and cylindrical members extending from a first end of the extrusion to a second end of the extrusion;
• and
• machining away sufficient lengths of the innermost cylindrical member and the first set of spokes to create a cavity in the central cylindrical member for receiving the stator and the rotor of the dynamoelectric machine.