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HTS Armature Winding of a Synchronous Machine

IP.com Disclosure Number: IPCOM000035579D
Publication Date: 2005-Jan-25
Document File: 3 page(s) / 355K

Publishing Venue

The IP.com Prior Art Database

Abstract

A superconducting armature winding for our alternating current (AC) synchronous machine is disclosed. The armature winding is constructed as a single layer winding. Individual coils are made out of a single sheet of YBCO coated sheet. Several sheets are stacked to form a coil. Sheets are separated from each other with an insulated layer of a suitable film or epoxy type insulation.

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HTS Armature Winding of a Synchronous Machine

Abstract

A superconducting armature winding for our alternating current (AC) synchronous machine is disclosed. The armature winding is constricted as a single layer winding. Individual coils are made out of a single sheet of YBCO coated sheet. Several sheets are stacked to form a coil. Sheets are separated from each other with an insulated layer of a suitable film or epoxy type insulation.

Description

A single coil sheet is shown in Figure 1. The process of construction of this coil sheet is as follows:

1. Get a YBCO coated sheet of suitable length.
2. Laminate it to a steel (or other suitable) stabilizer.
3. Laser cut the turns as shown in Figure 1.
4. Keep width of each turn small (~1 mm) in order to keep AC losses low.
5. Stack several sheets one on top of the other to form a coil. Employ a suitable film insulation between adjacent sheet coil. Individual coils could also be dipped into a suitable bath to deposit our electrical insulating layer or suitable insulating layer could be sprayed on.
6. Connections between adjacent layers are made by soldering end turn of one coil with start turn of the next coil. Connection must be made such that current in all turns flow in the same direction.

Two kinds of coils are fabricated. One set has end turns in the plane of the whole coil end. The other set has end turns bent outward as shown in Figure 2.

Figure 1: A sheet coil laser cut out of a YBCO coated sheet of HTS superconductor

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Figure 2: Two types of coils

The two sets of coils are assembled around a bare tube to make a three phase winding. End view of stator coil assembly is shown in Figure 3 for a 4...