Apparatus and method for suspending a stator core of an electric generator
First Claim
1. A suspension apparatus for suspending a ring-shaped or tube-shaped stator core (100) in an electric generator upon a foundation (206), wherein natural modes of vibration are excited in the stator core during operation, including a known second vibration mode with four circumferentially distributed loops (L1) and four nodes (N1) being displaced 45 degrees from the loops (L1), and a known third vibration mode with four loops (L2) and four nodes (N2) displaced 45 degrees in relation to the loops (L1) and nodes (N1) of the second vibration mode, characterised by:
- a yoke (208), a non-rigid connection (212) connecting the yoke and the foundation, and two connection members connecting the yoke and the stator core at connection points (210a,b) on opposite sides of the non-rigid connection (212), wherein the connection points (210a,b) 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 (208) around the non-rigid connection (212).
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Accused Products
Abstract
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.
7 Citations
7 Claims
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1. A suspension apparatus for suspending a ring-shaped or tube-shaped stator core (100) in an electric generator upon a foundation (206), wherein natural modes of vibration are excited in the stator core during operation, including a known second vibration mode with four circumferentially distributed loops (L1) and four nodes (N1) being displaced 45 degrees from the loops (L1), and a known third vibration mode with four loops (L2) and four nodes (N2) displaced 45 degrees in relation to the loops (L1) and nodes (N1) of the second vibration mode, characterised by:
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a yoke (208), a non-rigid connection (212) connecting the yoke and the foundation, and two connection members connecting the yoke and the stator core at connection points (210a,b) on opposite sides of the non-rigid connection (212), wherein the connection points (210a,b) 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 (208) around the non-rigid connection (212). - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of suspending a ring-shaped or tube-shaped stator core (100) in an electric generator upon a foundation (206), wherein natural modes of vibration are excited in the stator core during operation, including a known second vibration mode with four circumferentially distributed loops (L1) and four nodes (N1) being displaced 45 degrees from the loops (L1), and a known third vibration mode with four loops (L2) and four nodes (N2) displaced 45 degrees in relation to the loops (L1) and nodes (N1) of the second vibration mode, characterised by the steps of:
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connecting a yoke (208) to the foundation (206) by means of a non-rigid connection (212), and connecting the yoke to the stator core at connection points (210a,b) on opposite sides of the non-rigid connection (212) by means of two connection members, wherein the two connection points (210a,b) 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 (208) around the non-rigid connection (212).
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Specification