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Double-stator electromagnetic pump having alignment ring and spine assembly

United States Patent

5,642,011
June 24, 1997
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
A support structure for clamping the inner coils and inner lamination rings of an inner stator column of an electromagnetic induction pump to prevent damaging vibration. A spine assembly, including a base plate, a center post and a plurality of ribs, serves as the structural frame for the inner stator. Stacked alignment rings provide structure to the lamination rings and locate them concentrically around the spine assembly central axis. The alignment rings are made of a material having a high thermal expansion coefficient to compensate for the lower expansion of the lamination rings and, overall, provide an approximate match to the expansion of the inner flow duct. The net result is that the radial clamping provided by the duct around the stator iron is maintained (approximately) over a range of temperatures and operating conditions. Axial clamping of the inner stator structure is achieved via tie rods which run through grooves in the ribs and engage the base plate at the bottom of the inner stator and engage a clamping plate at the top. Slender tie rods and a flexible clamping plate are used to provide compliance in the axial clamping system to accommodate differential thermal growth (axially) between the tie rods and lamination ring elements without losing clamping force.
Fanning; Alan Wayne (San Jose, CA), Olich; Eugene Ellsworth (Aptos, CA), Dahl; Leslie Roy (Livermore, CA), Patel; Mahadeo Ratilal (San Jose, CA)
General Electric Company (San Jose, CA)
08/ 334,644
November 4, 1994
The Government of the United States of America has rights in this invention in accordance with Contract No. DE-AC03-89SF17445 awarded by the Department of Energy.