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Title: Waved core lamination techniques on large and bulb hydroelectric machinery

Stator core lamination of large hydroelectric generators and motors and especially bulb type machines are often exposed to heat expansion forces causing severe damages. The temperature difference between the warm core lamination and the relatively colder stator frame, creates both radial and tangential stresses in these components. The consequence of these stresses depends on the axial prestressing of lamination and the internal design of the core. An overriding of some critical combination of these stresses may result in buckling of lamination, fracture of core tensioning and supporting components or cracks in the stator frame. The present waved lamination technique reduces the tangential and radial spring constant of core and prevents the damages. The research performed through theoretical and experimental methods, indicates a fundamental change in the behavior of core. The waved lamination was successfully used in a large number of machines, providing the reliability and wide application range of the method.
Authors:
 [1]
  1. (General Power Engineering Associates Inc., of Florida, FL (US))
Publication Date:
OSTI Identifier:
6498119
Resource Type:
Journal Article
Resource Relation:
Journal Name: IEEE Trans. Power Electronics; (United States); Journal Volume: 3:4
Country of Publication:
United States
Language:
English
Subject:
13 HYDRO ENERGY; HYDROELECTRIC POWER PLANTS; EQUIPMENT PROTECTION DEVICES; DAMAGE; DEFORMATION; ELECTRIC GENERATORS; ELECTRIC MOTORS; SPRINGS; STATORS; THERMAL EXPANSION; THERMAL STRESSES; EXPANSION; MACHINE PARTS; MOTORS; POWER PLANTS; STRESSES 130300* -- Hydro Energy-- Plant Design & Operation