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Compensted Spoke for Superconductor Rotor

IP.com Disclosure Number: IPCOM000130702D
Publication Date: 2005-Nov-01
Document File: 2 page(s) / 107K

Publishing Venue

The IP.com Prior Art Database

Abstract

In a high temperature superconductor rotor, it was previously proposed to use a spoke between the free end of the pole support structure and the warm end of the torque tube to control natural frequencies of the cold mass.

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Compensated Spoke for Superconductor Rotor

In a high temperature superconductor rotor, it was previously proposed to use a spoke between the free end of the pole support structure and the warm end of the torque tube to control natural frequencies of the cold mass as shown below (see Figure 1):

Figure 1: Proposed topology with a conical torque tube and spoke

This approach has the added advantage of allowing the torque tube to be made of SS 304 which is readily available and cost effective. The torque tube would be made of two sections, a thin section between the spoke and cold flange and a thicker section between the spoke and its warm flange (the thick section is not shown). The spoke not only would increase the natural frequency of the breathing and lateral mode of the cold mass but also transfer some of the shock loads to the thick section of the torque tube.

Here, we have to have a strategy to reduce the conductive heat load associated with the spoke and prevent loss of spoke pre load due shrinkage of pole support structure. This is achieved by means of Belleview washers and G10 blocks as show below (See Figure 2):

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Figure 2: A close up view showing the Belleview washer, G10 block, spoke, outer ring and pole support structure.

This approach has the added advantage of accommodating manufacturing tolerances associated with out of roundness of pole support structure.

The spoke is first pre loaded...