Viscoelastic support for dynamoelectric machines

• US 4,434,382 A
• Filed: 01/18/1982
• Issued: 02/28/1984
• Est. Priority Date: 01/18/1982
• Status: Expired due to Fees

• Current Assignee: Electric Power Research Institute Incorporated
• Original Assignee: Electric Power Research Institute Incorporated
• Inventors: Nathenson, Richard D., Patel, Mukunk R.
• Primary Examiner(s): Skudy, R.
• Application Number:
  US06/340,433
• Time in Patent Office: 771 Days
• Field of Search: 310/51, 310/42, 310/157, 310/258, 310/194, 336/100, 188/297, 188/322.5, 188/378, 188/379, 74/574, 248/562, 248/636, 248/638
• US Class Current: 310/51
• CPC Class Codes: H02K 3/47 Air-gap windings, i.e. iron-free windings
• CPC Class Codes: H02K 55/04 with rotating field windings
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
• CPC Class Codes: Y10S 505/878 with cooling

Abstract

A viscoelastic support system is disclosed which utilizes an oil impregnated porous material. The porous bar has mechanical properties which behave in significantly different manners under sudden long duration loads. It withstands sudden forces with little deflection but deflects significantly in response to slowly applied forces. These dual characteristics avoid the harmful effects of additive stresses which could otherwise result from sudden loads caused by transient faults which occur following thermal expansion which has produced built up stresses following normal operation.

Claims

1. A dynamoelectric machine, comprising:

a cylindrical rotor member;

a generally cylindrical association of stator coils disposed within a generally cylindrical coil support structure, said coil support structure being generally cylindrical with a central bore therethrough, said coil support structure being disposed in concentric and coaxial relation around said rotor member;

an outer structure having a central cylindrical bore therethrough, said outer structure being disposed around said coil support structure in concentric and coaxial relation therewith, said outer structure having an inner diameter surface shaped to receive said coil support structure with a generally cylindrical gap therebetween;

said inner diametric surface having a first channel shaped to receive a preselected portion of an interface assembly;

said coil support structure having an outer diametric surface which has a second channel shaped to receive a preselected portion of said interface assembly; and

said interface assembly having a porous member impregnated with a liquid, said porous member being disposed within a generally flexible impermeable covering, a preselected portion of said interface assembly being disposed in said first channel and a preselected portion of said interface assembly being disposed in said second channel.

2. The dynamoelectric machine of claim 1, wherein:

said liquid is oil.

3. The dynamoelectric machine of claim 1, further comprising:

means for maintaining said liquid at a pressure which is higher than ambient pressure.

4. The dynamoelectric machine of claim 1, wherein:

said porous member is made of a fiber composite material.

5. The dynamoelectric machine of claim 2, wherein:

said oil is transformed oil.