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 Apparatus and method for suspending a stator core of an electric generator

Details
Inventors: Leif (Vä, steras, SE);
Assignee: ALSTOM Technology Ltd. (Baden, CH)
Primary Examiner: Schuberg; Darren
Assistant Examiner: Scheuermann; David W.
Attorney, Agent or Firm: Cermak & Kenealy, LLP, Cermak; Adam J.

An apparatus and method for suspending a stator core (100) in an electric generator upon a foundation (206), where two natural modes of vibration, including known second and third modes, are excited in the core, each mode having four loops and four nodes displaced 45 degrees between the second and third modes. A non-rigid connection (212) connects a yoke to the foundation, and two connection members connect the yoke to the stator core at opposite sides of the non-rigid connection. The two connection points (210a,b) are located at adjacent loops of one of the second and third vibration modes. By this arrangement, radial deflections of the stator core at the respective connection points are transferred into a rocking movement of the yoke around the non-rigid connection. Thereby, vibrations transferred to the foundation are considerably reduced during operation.

DETAILED DESCRIPTION The object of the present invention is to reduce or eliminate the problems outlined above.
This object and others are obtained by providing an apparatus and method for suspending a stator core in an electric generator upon a foundation, which is simple in construction and reliable in withstanding static, dynamic and shock loads, also minimising noise and fatigue.
Natural modes of vibration are excited in the stator core during operation, including a known second vibration mode with four circumferentially distributed loops and four nodes being displaced 45 degrees from the loops, and a known third vibration mode with four loops and four nodes displaced 45 degrees in relation to the loops and nodes of the second vibration mode.
The inventive apparatus comprises a yoke, a non-rigid connection between the yoke and the foundation, and two connection members connecting the yoke and the stator core at connection points on opposite sides of the non-rigid connection.
The connection points are located on the stator core substantially at two adjacent loops of one of the second and third vibration modes, such that radial deflections of the stator core at the respective connection points are transferred into a rocking movement of the yoke around the non-rigid connection.



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