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A dynamoelectric machine having a stator housing or frame made by a lost foam process utilizing a unitary single-piece vaporizable pattern. The stator housing may be made from a molten metal such as cast iron or aluminum, and has an annular wall having integral outwardly extending longitudinal cooli

A dynamoelectric machine having a stator housing or frame made by a lost foam process utilizing a unitary single-piece vaporizable pattern. The stator housing may be made from a molten metal such as cast iron or aluminum, and has an annular wall having integral outwardly extending longitudinal cooling fins, mounting foots pads and a conduit box support pad. The lost foam process enables the cooling fins to have a greater effective cooling fin height to housing diameter ratio and greater effective cooling fin height to housing annular wall thickness ratio than obtained with prior sand casting processes. The greater height fins provide increased strength and rigidity for the annular wall which can be made radially thinner than prior stator housing or frames of similar size. Substantial savings in material and labor are realized by the stator housing.

대표청구항 ▼

[ What is claimed is:] [1.] A stator frame for use in a dynamoelectric machine, said stator frame comprising an integral one-piece cast housing having a generally annular wall of a predetermined outer diameter and defining opposite ends having end surfaces lying in planes generally transverse to the

[ What is claimed is:] [1.] A stator frame for use in a dynamoelectric machine, said stator frame comprising an integral one-piece cast housing having a generally annular wall of a predetermined outer diameter and defining opposite ends having end surfaces lying in planes generally transverse to the longitudinal axis of said annular wall, said housing having a generally cylindrical axial bore intersecting said opposite ends and adapted to receive a stator core, and a plurality of external longitudinally extending cooling fins spaced about said annular wall and formed integral therewith, said cooling fins being configured to collectively establish a ratio of effective cooling fin height to said annular wall outer diameter of at least 4.0 at approximately the longitudinal center of said frame.