US 5,491,886 AGranted

Gapless inner diameter stator winding blocking mechanism

AssigneeEmerson Electric Co.

InventorsVernon E. Kieffer, Andrew J. Kliethermes

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Abstract

An inner diameter block for blocking the inner diameter of windings of an electric motor includes a plurality of first segments and a plurality of second segments arranged in an alternating manner. The segments are movable radially outwardly to block the inner diameter of the windings. One of the segments is generally pie shaped, having an arcuate outer surface and ears extending circumferentially to define part of the outer surface. These first segments define gaps which receive second segments. The first and second segments have sloping inner surfaces which define a core in which an expanding cone is received. The cone, when moved axially in the core, urges the second segments radially outwardly. The second segments then force the first segments radially outwardly. The interaction of the second segments with the ears of the first segments provide a substantially continuous, gap-free outer surface to the inner diameter block at all stages of expansion.

Claims20

Dependent claims

A blocking mechanism for blocking windings of a dynamoelectric machine, the windings having an inner diameter, an outer diameter, and a height;

the blocking mechanism including an outer diameter block for blocking the outer diameter of the windings, an inner diameter block for blocking the inner diameter of the windings, and a compression ring for blocking the height of the windings;
the inner diameter block including a plurality of segments forming an expandable ring which is movable between a compressed position and an expanded, blocking position;
said expandable ring having a blocking surface, said blocking surface being substantially continuous and gap-free throughout a transition between the compressed position and the expanded position;
said segments including a plurality of first segments and a plurality of second segments, said first and second segments being arranged in an alternating pattern in said block;
each of said first segments having a top surface, a bottom surface, an outer surface, a sloping inner surface, generally radially extending side walls, and ears extending circumferentially from opposite sides of each of said first segments, said ears having an outer surface defining part of said first segment outer surface;
each of said second segments having a top surface, a bottom surface, a radially outer surface, a sloping inner surface, and side walls.

3 more elements

Dependencies are inferred from the claim text.